KR102182849B1 - Technique for item transaction - Google Patents

Abstract

A computer program stored on a computer-readable storage medium is disclosed. When the computer program is executed by one or more processors, it performs a method for item transaction, the method comprising: receiving a transaction request for a first item playable in a game from a first user; Determining to move the first item to a temporary item accommodation space having an address in the blockchain network; And allowing the first item moved to the temporary item accommodation space to be a target of item transaction.

Description

Item trading technique {TECHNIQUE FOR ITEM TRANSACTION}

The present disclosure relates to item transactions, and more particularly, to a technique for allowing transparent and secure item transactions.

With the development of the Internet, transactions for various types of objects are made on various platforms through online. Objects existing in the virtual world, such as games, other than the real world, may also be recognized for their value, and accordingly, objects in the virtual world may also be objects of transaction. Previously, it was recognized that items used in games exist only in the game and their value only exists in the game. However, for games used by many users due to the development of the game industry, the society built in the game reproduces the same situations as the real society, and accordingly, the value of items and/or currency used in the game It is also recognized for its value as a good in the real world. In particular, due to the development of online/mobile technology such as O2O (Online To Offline) technology, the boundaries between online and offline are not clearly divided, and as the game industry also develops, these game-related items are currently referred to as "goods" or It is considered a "property advantage". Accordingly, the demand for transactions of various types of items that can be purchased or generated in the game is also increasing.

There are various ways to trade items related to the game.

The most representative method is the transaction method through an external game item brokerage. When a user wants to sell a specific item to another person, after accessing a separate game item agency, the game item agency site posts identification information of the item to be sold and an indication of the sale price. Then, the other user who checks the display posted on the game item agency site may indicate a purchase intention for the item to be sold and leave cash corresponding to the sale price to the game item agency. Then, after making an appointment with each other, the seller and the buyer connect to the game together, and then trade the item for sale at a specific place on the game. After the item transaction in the game is completed, the seller and/or the buyer connects to the game item brokerage site and posts an indication that the item transaction has been completed, and accordingly, the game item brokerage office can pay the cash entrusted by the buyer to the seller. For transactions through such game item brokerages, since it is difficult to provide clear physical evidence that the item was actually traded in the game, there may be a risk factor of instability. In addition, in the case of using such a game item brokerage, the process of posting by users, the process of trading game items after users access the game server by setting a time, the process of depositing the transaction amount, and the process of displaying the transaction completion, etc. Since there are many procedures, not only is transaction inconvenient, but there may be a risk to stability just by having to perform multiple procedures. In addition, since these game item brokerages are separate entities and charge high fees for game item transactions to cover the brokerage operating costs (e.g., server operating costs and labor costs, etc.), the cost burden in item trading is also a problem. Can be.

Another way to trade game-related items is an in-game item exchange that allows you to trade items in-game. The in-game item exchange is a concept in which an exchange or intermediary system is included in the game. That is, since item transactions can be made while playing the game, and item transactions can be completed on the game server itself without a process of directly meeting users, the in-game item exchange can increase the convenience of users for item transactions. However, in the case of an in-game item exchange, since it is included in the game, it is bound to be limited to item transactions related to the game itself. In addition, since the in-game item exchange is under the management of a game company, there is a limitation in the types of items to be sold, and there is a possibility that a stable item transaction may not be made due to a risk from external hacking. Furthermore, these in-game item exchanges also have weaknesses in terms of ensuring transparency of transactions.

Therefore, there is a demand for an item transaction method capable of securing transparency in item transaction and allowing stable item transaction.

Korean registered patent KR10-1673073

An object of the present disclosure is to provide an item transaction technique for securing transparency and stability of item transaction.

According to an embodiment of the present disclosure, a computer program stored in a computer-readable storage medium is disclosed. When the computer program is executed by one or more processors, it performs a method for item transaction, the method comprising: receiving a transaction request for a first item playable in a game from a first user; Determining to move the first item to a temporary item accommodation space having an address in the blockchain network; And allowing the first item moved to the temporary item accommodation space to be a target of item transaction.

According to an embodiment of the present disclosure, a game server for performing item transactions is disclosed. The game server includes: a transmission/reception unit for receiving a transaction request for a first item playable in a game from a first user; And determining to move the first item to an item storage space in the game server, to move the first item to a temporary item accommodation space having an address in the blockchain network, and to the temporary item accommodation space. It may include a processor that allows the moved first item to be a target of item transaction.

According to an embodiment of the present disclosure, an item exchange server is disclosed. The item exchange server: a signal for receiving a transaction request for a first item playable in the game from a first user, and allowing the first item to be moved to an item storage space in the game server Transmitting and receiving unit for transmitting to the game server; And generating a transaction to be distributed to the blockchain network to move the first item to a temporary item accommodation space having an address in the blockchain network, and the first item moved to the temporary item accommodation space It may include a processor that determines to transmit information related to the transaction to the game server to allow it to become a target.

According to an embodiment of the present disclosure, a computing device constituting a blockchain network is disclosed. The computing device includes: a processor; And a memory storing a computer program executable by the processor. Here, the processor: receives a first transaction including a smart contract corresponding to a transaction request for a first item playable in the game from a first user; Including the first transaction in a first block generated according to a consensus algorithm; Based on the smart contract included in the first transaction, the first item is moved to a temporary item accommodation space having an address in the blockchain network, thereby allowing the first item to be a target of item transaction. I can.

According to an embodiment of the present disclosure, an item transaction technique for securing transparency and stability may be achieved.

Various aspects are now described with reference to the drawings, wherein like reference numbers are used collectively to refer to like elements. In the examples that follow, for illustrative purposes, a number of specific details are presented to provide a holistic understanding of one or more aspects. However, it will be apparent that such aspect(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate describing one or more aspects.
1 shows an exemplary system for performing item transactions according to an embodiment of the present disclosure.
2 exemplarily shows a game server and an item exchange server according to an embodiment of the present disclosure.
3 exemplarily illustrates an item transaction method performed in a game server according to an embodiment of the present disclosure.
4 exemplarily illustrates an item transaction method performed in an item exchange server according to an embodiment of the present disclosure.
FIG. 5 exemplarily shows an item transaction method performed in a computing device in a blockchain network according to an embodiment of the present disclosure.
6 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.
7 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.
8 shows an exemplary flowchart of an item transaction method according to an embodiment of the present disclosure.
9 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.
10 exemplarily shows an item transaction method in a blockchain network according to an embodiment of the present disclosure.
11 illustrates an exemplary UI (User Interface) configuration for performing item transaction in a user terminal according to an embodiment of the present disclosure.
12 illustrates an exemplary UI configuration for performing item transaction in a user terminal according to an embodiment of the present disclosure.
13 exemplarily shows a manner in which a smart contract is propagated to a blockchain network according to an embodiment of the present disclosure.
14 exemplarily shows a connection structure of blocks stored in a blockchain network according to an embodiment of the present disclosure.
15 shows a general schematic diagram of an exemplary computing environment in which embodiments of the present disclosure may be implemented.

Various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for illustrative purposes, a number of specific details are disclosed to aid in an overall understanding of one or more aspects. However, it will also be appreciated by those of ordinary skill in the art that this aspect(s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of one or more aspects. However, these aspects are exemplary and some of the various methods in the principles of the various aspects may be used, and the descriptions described are intended to include all such aspects and their equivalents.

In addition, various aspects and features will be presented by a system that may include one or more computing devices, terminals, servers, devices, components and/or modules, and the like. Devices, terminals, servers discussed in connection with the figures and/or that various systems may include additional computing devices, terminals, servers, devices, components and/or modules, etc. It should also be understood and recognized that it may not include all of, devices, components, modules, etc.

The terms "computer program," "component", "module", and the like used herein may be used interchangeably. For example, a component may be, but is not limited to, a process executed on a processor, a processor, an object, an execution thread, a program, and/or a computer. For example, both an application running on a computing device and a computing device may be components. One or more components may reside within a processor and/or thread of execution. A component can be localized on a single computer. A component can be distributed between two or more computers.

In addition, these components can execute from various computer readable storage media having various data structures stored therein. Components can be, for example, via a signal with one or more data packets (e.g., data from one component interacting with another component in a local system, a distributed system, and/or a signal through another system and a network such as the Internet. Depending on the data being transmitted), it may communicate via local and/or remote processes.

As used herein, “an embodiment,” “example,” “aspect,” “example,” and the like may not be construed as having any aspect or design described as being better or advantageous than other aspects or designs. . The terms'component','module','system', and'interface' used below generally mean a computer-related entity, for example, a combination of hardware, hardware and software. , Or software.

In addition, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or”. That is, unless specified otherwise or is not clear from the context, "X employs A or B" is intended to mean one of the natural inclusive substitutions. That is, X uses A; X uses B; Or, when X uses both A and B, “X uses A or B” can be applied to either of these cases. In addition, the term "and/or" as used herein should be understood to refer to and include all possible combinations of one or more of the listed related items.

In addition, the terms "comprising" and/or "comprising" mean that the corresponding feature and/or element is present, but excludes the presence or addition of one or more other features, elements and/or groups thereof. It should be understood as not. In addition, unless otherwise specified or when the context is not clear as indicating a singular form, the singular in the specification and claims should be interpreted as meaning "one or more" in general.

In the present specification, the computer-readable medium may include all kinds of media in which programs and data are stored to be readable by a computer system. Computer-readable media in the present disclosure may include computer-readable storage media and computer-readable transmission media. According to an aspect of the present invention, a computer-readable storage medium includes: ROM (read only memory), RAM (random access memory), CD (compact disk)-ROM, DVD (digital video disk)-ROM, magnetic tape, floppy It may include a disk, an optical data storage device, and the like. Further, the computer-readable transmission medium may include any transportable medium implemented in the form of a carrier wave (eg, transmission over the Internet). Additionally, such computer-readable media may be distributed over networked systems to store computer-readable codes and/or instructions in a distributed manner.

Prior to describing specific details for the implementation of the present invention, it should be noted that configurations that are not directly related to the technical gist of the present invention have been omitted within the scope not disturbing the technical gist of the present invention. In addition, terms or words used in the present specification and claims are based on the principle that the inventor can define the concept of appropriate terms to describe his or her invention in the best way, and has a meaning consistent with the technical idea of the present invention. It should be interpreted as a concept.

[Description of Figure 1]

1 shows an exemplary system for performing item transactions according to an embodiment of the present disclosure.

As shown in Fig. 1, the system for performing item transaction includes user terminals 100a, 100b and 100c: 100, game server 200, item exchange server 300, blockchain network 400, and communication. Network 500 may be included. Components illustrated in FIG. 1 are exemplary, and additional components may exist or some of the components illustrated in FIG. 1 may be omitted.

The user terminal 100 has a mechanism for communicating with each other or with other nodes through the communication network 500, and may mean any type of node in a system for performing the item transaction. For example, user terminal 100 may include a PC, laptop computer, workstation, terminal, and/or any electronic device with network connectivity. In addition, the user terminal 100 may include an arbitrary server implemented by at least one of an agent, an application programming interface (API), and a plug-in. In addition, the user terminal 100 may include an application source and/or a client application.

The user terminal 100 may be any entity capable of processing and storing arbitrary data, including a processor and a storage unit (memory and permanent storage medium).

The processor in the present disclosure may be composed of one or more cores, and a central processing unit (CPU), a general purpose graphics processing unit (GPGPU), and a tensor processing unit (TPU: Tensor processing unit) may include an arbitrary type of processor for performing item transactions by executing instructions stored in the memory. The processor may read a computer program stored in a memory to perform an item transaction technique according to an embodiment of the present disclosure.

The memory in the present disclosure may store a program for operation of a processor, and may temporarily or permanently store input/output data. Memory is a flash memory type, hard disk type, multimedia card micro type, card type memory (for example, SD or XD memory), RAM (Random Access). Memory, RAM), SRAM (Static Random Access Memory), ROM (Read-Only Memory, ROM), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory), magnetic memory, magnetic disk, optical disk At least one type of storage medium may be included. This memory can be operated under control of the processor. Further, in the present disclosure, the memory and the storage unit may be used interchangeably with each other.

The user terminal 100 in FIG. 1 may be associated with a user who wants to access at least one of the game server 200, the item exchange server 300, and the blockchain network 400.

The user terminal 100 may issue a query or a transaction to at least one of the game server 200, the item exchange server 300, and the blockchain network 400. The query in the present disclosure may be used to inquire item information registered on the blockchain network 400. The transaction in the present disclosure can be used to record/insert data on the blockchain network 400 or perform an update (modification/change/delete/addition) on data recorded on the blockchain network 400. have.

The user terminal 100 may transmit and receive an application source written in a programming language. For example, the user terminal 110 may generate a client application by compiling an application source. For example, the generated client application may be executed after being delivered to at least one of the game server 200, the item exchange server 300, and the blockchain network 400.

The user terminal 100 may create a smart contract that can be operated on the blockchain network 400 using an arbitrary language such as Solidity. In addition, the user terminal 100 may generate a transaction for distributing the generated smart contract to the blockchain network 400.

The user terminal 100 can access the game server 200 to play a game provided by the game server, and can use any type of game-related item acquired or purchased in the game in the game. . The game in the present specification may include any type of game such as a mobile game, a web game, a VR game, a P2P game, and an online/offline game.

In addition, the user terminal 100 may generate a transaction request message for the game-related item and transmit it to at least one of the game server 200, the item exchange server 300, and the blockchain network 400. In addition, the user terminal 100 may receive data related to item transaction from at least one of the game server 200, the item exchange server 300, and the blockchain network 400.

The user terminal 100 may also operate as a node constituting the block chain network 400. In this example, the user terminal 100 may implement at least one of a wallet function, a minor function, and a full blockchain data storage function. For example, when the user terminal 100 includes only a wallet function, it may operate as a node that performs transaction and validation (eg, a Simplified Payment Verification (SPV) node).

Since the user terminal 100 has a display, it can receive a user's input and provide an arbitrary type of output to the user in performing game play and/or item transaction.

Game server 200 and item exchange server 300 according to an embodiment of the present disclosure may be any type of computer system, such as a microprocessor, mainframe computer, digital processor, portable device and device controller, or the like. It may include a computer device. Although not shown in FIG. 1, the game server 200 and the item exchange server 300 may include a memory and a processor.

The game server 200 may allow the user terminal 100 to play a game. The item exchange server 300 may allow the user terminal 100 to perform a transaction for an item in any form playable in the game.

In FIG. 1, the game server 200 and the item exchange server 300 are separated and represented as separate entities, but the item exchange server 300 is included in the game server 200 according to an embodiment of the present disclosure. The play function and item transaction function can be performed in one integrated server. In this example, when the function of the item exchange server 300 is integrated into the game server 200, the user terminal 100 may perform an in-game item transaction.

In addition, when the item exchange server 300 and the game server 200 are separated, the user terminal 100 may perform a game item transaction through the item exchange server 300 existing outside the game server 200. . In this case, the item exchange server 300 may communicate with the game server 200 and the blockchain network 400 to implement item transaction.

Additionally, at least one of the game server 200 and the item exchange server 300 may operate as a node constituting the blockchain network 400.

In an embodiment of the present disclosure, the blockchain network 400 may refer to a plurality of nodes operating based on the blockchain technology. Here, the blockchain technology is a distributed storage technology that stores data to be managed in a plurality of nodes constituting a blockchain network using a storage structure in which blocks are connected in a chain form.

The blockchain network 400 may store a transaction transmitted from at least one of the user terminal 100, the game server 200, and the item exchange server in a block form based on a predetermined consensus algorithm. Data stored in a block form may be shared by a plurality of nodes constituting the blockchain network 400.

In FIG. 1, the blockchain network 400 is expressed as a separate entity, but according to the embodiment of the present disclosure, the blockchain network 400 is at least one of the game server 200 and/or the item exchange server 300. It may be implemented in a form included in one.

The blockchain network 400 may include a public blockchain network in which arbitrary nodes can perform consensus operations or a private blockchain network in which only predetermined nodes can perform consensus operations, depending on the implementation form. .

The consensus algorithm performed in the blockchain network 400 according to an embodiment of the present disclosure is: PoW (Proof of Work) algorithm, PoS (Proof of Stake) algorithm, DPoS (Delegated Proof of Stake) algorithm, PBFT (Practical Byzantine Fault Tolerance) algorithm, Delegated Byzantine Fault Tolerance (DBFT) algorithm, Redundant Byzantine Fault Tolerance (RBFT) algorithm, Sieve algorithm, Tendermint algorithm, Paxos algorithm, Raft algorithm, PoA (Proof of Authority) algorithm and/or PoET (Proof of Elapsed Time) algorithm may be included.

In an exemplary embodiment of the present disclosure, nodes in the blockchain network 400 may operate by a blockchain core package according to a hierarchical structure. The hierarchical structure is: a data layer that defines the structure of data handled by the blockchain network 400 and manages the data, a fee paid to the miners during the mining process, performing mining to verify the validity of blocks and generating blocks A consensus layer in charge of processing of, an execution layer that processes and executes smart contracts, a common layer that implements and manages P2P network protocols, hash functions, digital signatures, encoding and common storage, and various applications are created, processed and managed It can include an application layer.

According to an embodiment of the present disclosure, by using the blockchain network 400 in trading game items, user convenience for item transactions, transparency of transactions, and integrity of transactions can be provided, as well as game services. An independent item transaction service may be provided to the game platform rather than the unit.

Items subject to transaction in the present disclosure include items of any type that can be played in the game, and may include, for example, non-floungible items and fungible items. For non-Fungible items, transactions may be performed based on, for example, the ERC-721 standard code and/or the ERC-1155 standard code. In addition, for the Fungible item, a transaction may be performed based on, for example, the ERC-20 standard code and/or the ERC-1155 standard code.

Communication network 500 according to an embodiment of the present disclosure is a public switched telephone network (PSTN), x Digital Subscriber Line (xDSL), Rate Adaptive DSL (RADSL), Multi Rate DSL (MDSL), VDSL. Various wired communication systems such as (Very High Speed DSL), Universal Asymmetric DSL (UADSL), High Bit Rate DSL (HDSL), and local area network (LAN) can be used.

In addition, the communication network 500 presented in the present disclosure includes Code Division Multi Access (CDMA), Time Division Multi Access (TDMA), Frequency Division Multi Access (FDMA), Orthogonal Frequency Division Multi Access (OFDMA), and SC-FDMA. Various wireless communication systems such as (Single Carrier-FDMA) and other systems can be used. The techniques described in this disclosure may be used not only in the networks mentioned above, but also in any type of other communication networks.

As an account having a specific address on the blockchain network 400 (e.g., an externally owned account (EOA) and/or a contract account (CA)), the "temporary item accommodation space" in the present disclosure is, the blockchain network 400 ) Can perform a function of temporarily accommodating items subject to transaction. According to an embodiment of the present disclosure, the account may be generated by a transaction generated based on the private key of the game server 200, the private key of the item exchange server 300, or the private key of the first user.

The "temporary item storage space" in the present disclosure means a separate item storage space managed in the game by the game server 200. For example, the temporary item storage space may include a safe in a game, a common inventory, an inventory for item trading, an item exchange, and the like. When an item sale request is generated by the user, the game server 200 may move the corresponding item from the user's inventory to a temporary item storage space. Accordingly, users can know that the item is subject to transaction in the game. In addition, when the item transaction is completed, the item stored in the "temporary item storage space" may be moved to the inventory in the game of the second user who purchased the item.

Smart contracts according to embodiments of the present disclosure may be written in a digital language for performing item transactions and executed on any computing device. That is, when a code and/or function included in a smart contract is executed, an item transaction in any form (eg, sale, purchase, rental, etc. of a game item) according to embodiments of the present disclosure may be performed. .

The smart contract according to the embodiments of the present disclosure may be applied to at least one of a method of creating a new smart contract, a method of executing a function on a specific smart contract, or a method of transmitting a coin operable in the blockchain network 400. Can be implemented by In addition, smart contracts can be executed by transactions or other contracts generated by externally owned accounts.

Coins in this specification may mean any form of cryptocurrency that can be operated on the blockchain network 400. These coins may be convertible into cash according to the market price by the item exchange server 300 or the game server 200.

Smart contracts for performing item transactions according to embodiments of the present disclosure, for example, to prevent malicious code such as infinite repetition and to ensure the integrity of data related to item transactions, to pay a specific execution cost when executing a transaction. It can also be defined. The execution cost here may mean any type of coin that can be traded on the blockchain network 400 or another type of medium that can be interlocked with the coin (eg, gas, etc.). As a non-limiting example, the base execution cost of the transaction may be set to 21,000 gas. For example, such execution costs may include the cost of processing the Elliptic Curve Digital Signature Algorithm (ECDSA) for the account address of the issuer of the transaction, the storage cost for storing the transaction, and the network bandwidth cost. If the smart contract is defined to pay a certain cost when executing the smart contract, malicious attacks such as infinite execution such as intentional DDoS attacks can be prevented.

A call between smart contracts in order to perform item transaction according to embodiments of the present disclosure may be implemented using a structure called a message. For example, these messages can be generated by a contract account (CA), and can be delivered to other contracts when calling a function. In one embodiment, since the message in this case is generated and processed inside the blockchain network 400, unlike transactions that occur in externally owned accounts, separate execution costs such as gas may not be incurred.

In implementing the item transaction according to the embodiments of the present disclosure, when synchronizing through a block chain by including a function of a smart contract in a transaction in the form of a compiled code, a code using information included in the transaction as an input of the function Smart contracts can be implemented by executing the function represented by and storing the result in a separate state.

When the contents of the function and the input of the function are shared by a smart contract shared in the blockchain network 400, the integrity of the data can be guaranteed even if the result of the function is not separately shared.

In a further embodiment, the computing devices constituting the blockchain network 400 of the present disclosure for performing item transactions are a transaction storage database that changes the state of the smart contract and a smart contract that stores the latest state of the smart contract. It can also contain a database. In this case, the smart contract for item transaction in the present disclosure may be defined as an application that can change the state on the blockchain network 400 (ie, an item transaction application), and the state of the smart contract is It can be defined as a variable used in the application (i.e., item trading application), and the input value for changing it is issued from at least one of the game server 200, the item exchange server 300, and the user terminal 100 Can be included in the transaction.

In a further embodiment, the database storing the state of the smart contract may be combined with the database storing the transaction to achieve a high compression rate. In addition, in order to achieve the distributed consensus of the database storing the state of the smart contract and low dependency of the smart contract, it can operate separately from the database storing the transaction.

[Description of Figure 2]

FIG. 2 exemplarily illustrates a game server 200 and an item exchange server 300 according to an embodiment of the present disclosure.

As shown in FIG. 2, the game server 200 may include a processor 201, a storage unit 202, and a transmission/reception unit 203, and the item exchange server 300 is a processor 301, a storage unit. 302 and a transceiver 303 may be included. The above-described components are exemplary, and the scope of the present disclosure is not limited to the above-described components. That is, additional components may be included or some of the above-described components may be omitted according to implementation aspects of the embodiments of the present disclosure.

In FIG. 2, for convenience of explanation, only an example of an embodiment in which the game server 200 and the item exchange server 300 are separated is shown, but the game server 200 according to an implementation mode according to an embodiment of the present disclosure It may also include all the functions of the item exchange server 300. In this case, the components 201, 202, and 203 of the game server 200 may perform functions of the components 301, 302, and 303 of the item exchange server 300.

According to an embodiment of the present disclosure, the game server 200 is a transmission/reception unit that receives a transaction request for a first item playable in the game from a first user who wishes to trade an item (eg, sale or rental, etc.) (203) may be included. In addition, the transmission/reception unit 203 may receive a transaction request from a second user who wishes to trade the first item (eg, purchase or lease) after the first item is registered to be a target of the transaction. .

The transceiver 203 may include a wired/wireless Internet module for network access. As a wireless Internet technology, WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband) Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), and the like may be used. As a wired Internet technology, XDSL (Digital Subscriber Line), FTTH (Fibers to the Home), PLC (Power Line Communication), etc. may be used. In addition, the transmission/reception unit 203 may include a short range communication module. As a short-range communication technology, Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like may be used.

The transceiver 203 may perform communication with the user terminal 100, communication with the blockchain network 400, and communication with other servers.

The storage unit 202 may store information in an arbitrary form generated or determined by the processor 201 and information in an arbitrary form received by the transmission/reception unit 203 in the game server 200. The storage unit 202 may include a memory and/or a permanent storage medium.

The processor 201 may control overall operations of the components of the game server 200 to allow item transaction. For example, the processor 201 moves a first item to an item storage space in the game server 200, and moves the first item to a temporary item accommodation space having an address in the blockchain network 400 It is possible to determine what to do, and allow the first item moved to the temporary item accommodation space to be an object of item transaction. In addition, when receiving a purchase request from the second user, the processor 201 may process the first item to be moved from the temporary item storage space in the game server 200 to the inventory of the second user.

The item exchange server 300 receives a transaction request for a first item playable in the game from a first user, and allows the first item to be moved to an item storage space in the game server 200. It may include a transmission/reception unit 303 for transmitting a signal to be allowed to the game server 200. In addition, the transmission/reception unit 303 may receive a transaction request for the first item from a second user who wishes to trade (eg, purchase or rent) the first item.

The transceiver 303 may include a wired/wireless internet module for network access. As a wireless Internet technology, WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband) Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access), and the like may be used. As a wired Internet technology, XDSL (Digital Subscriber Line), FTTH (Fibers to the Home), PLC (Power Line Communication), etc. may be used. In addition, the transceiver 303 may include a short range communication module. As a short-range communication technology, Bluetooth, Radio Frequency Identification (RFID), infrared data association (IrDA), Ultra Wideband (UWB), ZigBee, and the like may be used.

The transceiver 303 may perform communication with the user terminal 100, communication with the blockchain network 400, and communication with other servers.

The storage unit 302 may store information in an arbitrary form generated or determined by the processor 301 and information in an arbitrary form received by the transmission/reception unit 303 in the item exchange server 300. The storage unit 302 may include a memory and/or a permanent storage medium.

The processor 301 generates a transaction to be distributed to the blockchain network 400 in order to move the first item to the temporary item accommodation space having an address in the blockchain network, and the first item moved to the temporary item accommodation space. In order to allow this item to be a target of transaction, it may be determined to transmit information related to the transaction to the game server 200. In addition, when receiving a purchase request from a second user, the processor 301 generates a corresponding transaction and distributes it to the blockchain network 400, so that the first item from the temporary item accommodation space to the second user's inventory. You can allow it to be moved.

Although not shown in FIG. 2, at least one of the game server 200 and the item exchange server 300 may operate as a computing device constituting the blockchain network 400. In this case, the computing device may include a processor and a memory storing a computer program executable by the processor.

According to an embodiment of the present disclosure, the computing device may receive a first transaction including a smart contract corresponding to a transaction request for a first item playable in a game from a first user. In addition, the processor of the computing device may include the first transaction in a first block generated according to a consensus algorithm. In addition, the processor in the computing device moves the first item to a temporary item accommodation space having an address in the blockchain network 400 based on the smart contract included in the first transaction, so that the first item is an item transaction. It can be configured to allow it to be the subject of.

According to an embodiment of the present disclosure, the computing device may receive a second transaction corresponding to a request for a transaction (eg, purchase or rental) for a first item from a second user. According to the second transaction, the smart contract stored in the blockchain network 400 may be called by the first transaction. When the second transaction is distributed and shared in the blockchain network 400 according to the consensus algorithm, a transaction procedure for the first item may be performed based on the second transaction. For example, the transaction procedure for the first item may include a procedure for changing ownership of the first item from a first user to a second user, a procedure for transferring the transaction amount from the second user to the first user, and/or a temporary item. It may include a procedure for moving the first item from the accommodation space to the address or account of the second user.

[Description of Figure 3]

3 exemplarily shows an item transaction method performed in the game server 200 according to an embodiment of the present disclosure.

The steps illustrated in FIG. 3 are exemplary steps, and it will be apparent to those skilled in the art that some of the steps of FIG. 3 may be omitted or additional steps may exist without departing from the scope of the spirit of the present disclosure.

The game server 200 may receive a transaction request for a first item playable in the game, generated from the first user (310). For example, the game server 200 may directly receive a transaction request for the first item from the user terminal 100 of the first user. As another example, after the user terminal 100 of the first user transmits a transaction request for the first item to the item exchange server 300, the game server 200 is sent from the item exchange server 300 to the first user. It is also possible to receive a signal that a transaction request has been made for the first item of.

In an embodiment of the present disclosure, the first item may mean a game item in a form that can be played and traded in a game. In addition, the transaction request for the first item may be in the form of a message including an indication to sell or rent the first item, or may be in the form of a transaction that can be shared on the blockchain network 400.

In the former case, the game server 200 may generate a smart contract and a transaction based on transaction request information for the first item. In addition, in the former case, the game server 200 may transmit a message including an indication to sell or rent the first item to the item exchange server 300.

In the latter case, the smart contract generated by the user terminal 100 may be included in the transaction and transmitted to the game server 200 (or the item exchange server 300). In this example, the user terminal 100 may include any form of API capable of generating smart contracts and transactions operable in the blockchain network 400.

The game server 200 may prevent the first item from being played in the game by moving the first item to the item storage space in the game server 200 (320). In this case, the game server 200 separates the first item from the inventory in the game of the first user in order to allow the first item not to be played in the game while maintaining the ownership of the first item to the first user. Can be moved to the item storage space of. For game items moved to a separate item storage space in the game server 200, game play may be restricted. The game server 200 may process information on a corresponding item to be output in the game so that users can search for an item moved to the item storage space in the game server 200.

In one embodiment of the present disclosure, the game server 200 creates a smart contract operable on the blockchain network 400 for the transaction of the first item, and transfers the transaction including the smart contract to the blockchain network 400. Can be issued (330).

In an embodiment, the game server 200 may generate a smart contract based on transaction condition information included in a transaction request for a first item generated by the user terminal 100. For example, the transaction type information or transaction condition information may include at least one of an automatic purchase reservation transaction, an upper limit auction transaction, a rental transaction, a price designation general transaction, an advertisement generation transaction, and a donation generation transaction. A user who wishes to trade an item may indicate that he wishes to trade a game item and input a transaction condition for the game item on a UI (User Interface), and in response, the game server 200 may use the user's input information. It is possible to automatically create smart contracts that can operate on the blockchain network 400.

For example, a smart contract is included in a block and distributed to the blockchain network 400, and when the smart contract is distributed to the blockchain network 400, a contract account corresponding to the smart contract is Can be created. In addition, as the smart contract is stored in the contract account on the blockchain network 400, a procedure for the transaction of the first item may be performed on the blockchain network 400. For example, the contract account in which the smart contract is stored may include: the number of smart contracts created for item transaction, and a hash value for the byte code of the smart contract for item transaction.

In addition, the address of the contract account may be generated based at least in part on the private key of at least one of the first user, the game server, and the item exchange server. In one embodiment, the address of the contract account may be generated based on the public key paired with the private key of the game server 200. For example, the address of the contract account may be generated from the public key using SHA 256 and/or RIPEMD (RACE Integrity Primitives Evaluation Message Digest).

In one embodiment, a block distributed to the blockchain network 400 may include a smart contract for item transaction and item transaction history information. According to an embodiment of the present disclosure, when only the smart contract and item transaction details information are included in the block distributed to the blockchain network 400, the block size of the block chain can be minimized in performing item transactions. In addition, the generation time of the block and the propagation time of the block may be reduced, and computing resources for storage of the block may be reduced.

In addition, smart contracts are distributed to the blockchain network based on a consensus algorithm by a plurality of nodes, wherein the plurality of nodes include one or more external computing devices, one or more user terminals, one or more game servers, and one or more It may include at least two of the item exchange server.

In an additional embodiment, the game server 200 is a private key associated with at least one of the first user, the item exchange server 300 and the game server 200 in order to perform item transaction on the first item. Using, it is also possible to create a transaction for moving the first item to a blockchain address associated with the temporary item accommodation space. In this case, the transaction includes: a transaction input value including identification information for the first item and signature information generated from the private key, and a transaction output value including block chain address information associated with the temporary item accommodation space. I can.

In addition, the temporary item accommodation space having an address on the blockchain network 400 will correspond to the temporary item storage space of the game server 200 (e.g., in-game safe, public inventory, item transaction inventory, item exchange). I can. That is, since the transaction history generated in the temporary item storage space implemented in the game server 200 can be stored in the temporary item accommodation space in the corresponding blockchain network, reliability and integrity of the item transaction can be ensured. have.

In an additional embodiment, a transaction is issued to the blockchain network 400 by the item exchange server 300, and the game server 200 indicates that such a transaction was issued from the item exchange server 300 or the blockchain network 400. It may also operate in the form of receiving information that information or transaction has been shared with the blockchain network 400.

In an embodiment, the game server 200 may receive a purchase request for the first item from a second user who has confirmed that the first item is a transaction target (340 ). For example, the game server 200 may directly receive a transaction request (eg, a purchase request) for the first item from the user terminal 100 of the second user. As another example, after the user terminal 100 of the second user transmits the purchase request for the first item to the item exchange server 300, the game server 200 is sent from the item exchange server 300 to the second user. It is also possible to receive a signal indicating that a purchase request for the first item of the product has been made.

In one embodiment, the purchase request for the first item from the second user may be in the form of a message including an indication to purchase the first item or of a transaction that can be operated on the blockchain network 400. It can also be a form. In the latter case, it may be included in the transaction generated by the user terminal 100 and transmitted to the game server 200 (or the item exchange server 300). In this example, the user terminal 100 may include any form of API capable of generating a transaction operable in the blockchain network 400.

In an embodiment of the present disclosure, the game server 200 may generate a transaction including a purchase request from a second user and issue it to the blockchain network 400 (350). By such a transaction, a smart contract pre-stored in the blockchain network 400 may be called. As an example, after receiving a signal including an indication that the user wants to purchase a first item from the second user, the game server 200 checks whether the signal satisfies the purchase condition presented by the first user, If satisfied, you can create a transaction to call the smart contract. As another example, the game server 200 may transmit a transaction generated by the second user to the blockchain network 400. As another example, the game server 200 may convert a signal including an indication that the second user wants to purchase the first item into a transaction form operable on the blockchain network 400.

In one embodiment of the present disclosure, the game server 200, when a settlement procedure for the transaction amount between the account of the first user and the account of the second user proceeds as the smart contract is executed, the game server 200 It may be determined that the first item is moved from the temporary item storage space to the inventory of the second user (360). For example, when the game server 200 receives the content that the item transaction has been performed between the first user and the second user as the smart contract is executed from the blockchain network 400 or from the item exchange server 300, It may be determined to move the first item moved to the temporary item storage space in the game to the in-game inventory of the second user.

When the blockchain network 400 exists outside the game server 200, the game server 200 receives/acquires transaction history information generated in the blockchain network 400, and the corresponding information in the game server 200 Can reflect. In this way, the transaction history of items with integrity on the blockchain network 400 may be reflected into the game server 200.

When the block chain network 400 exists inside the game server 200 (that is, when the game server 200 manages the block chain network 400), the game server 200 Item transaction histories updated/changed in the network 400 may be displayed in the game server 200.

Additionally, if the first user cancels the sale of the first item or if ownership of the first item is successfully transferred to the second user, the game server 200 transfers the first item from the temporary item storage space. By moving to another location (either the first user's or the second user's in-game inventory) the first item may be allowed to return to a usable state in the game.

In one embodiment, the settlement procedure for the item transaction between the first user and the second user may be performed by the game server 200 or the item exchange server 300, or a smart contract in the blockchain network 400 itself. It may be performed according to the execution of For example, when the ownership of the first item is changed from a first user to a second user who wants to purchase the first item, the first user related to the first user from a second externally owned account related to the second user A procedure of generating a transaction or message for delivering at least a portion of the transaction cost of the first item to an externally owned account may be performed on the blockchain network.

In embodiments of the present disclosure, the game server 200 and/or the item exchange server 300 may operate on an off-chain basis. In this case, the game server 200 and/or the item exchange server 300 may communicate with an external blockchain network to perform item transaction. In addition, the game server 200 and/or the item exchange server 300 may operate as a node constituting the blockchain network 400.

According to another embodiment, the game server 200 and/or the item exchange server 300 may have a blockchain network 400. In this case, the blockchain network 400 may operate in the form of a private blockchain or a Consortium blockchain.

[Description of Figure 4]

4 exemplarily shows an item transaction method performed in the item exchange server 300 according to an embodiment of the present disclosure.

The steps shown in FIG. 4 are exemplary steps, and it will be apparent to those skilled in the art that some of the steps of FIG. 4 may be omitted or additional steps may exist without departing from the scope of the spirit of the present disclosure.

The item exchange server 300 may receive a transaction request for a first item playable in the game, generated from the first user (410). For example, the item exchange server 300 may directly receive a transaction request for the first item from the user terminal 100 of the first user. As another example, after the user terminal 100 of the first user transmits a transaction request for the first item to the game server 200, the item exchange server 300 is sent from the game server 200 to the first user. A signal indicating that a transaction request has been made for the first item may be received.

In an embodiment of the present disclosure, the first item may mean a game item in a form that can be played and traded in a game. In addition, the item exchange server 300 may allow not only a single game (service unit) but also an arbitrary type of game item that can be played in a plurality of games (ie, world units) to be traded.

The transaction request for the first item may be in the form of a message including an indication to sell or rent the first item, or may be in the form of a transaction that can be shared on the blockchain network 400. In the former case, the item transaction server 300 may generate a smart contract and a transaction based on transaction request information for the first item. In the latter case, the smart contract generated by the user terminal 100 may be included in the transaction and transmitted to the item exchange server 300 (or the game server 200). In this example, the user terminal 100 may include any form of API capable of generating smart contracts and transactions operable in the blockchain network 400.

The item exchange server 300 may transmit a signal to the game server 200 so that the first item is moved to an item storage space managed in the game server 200 (420). When the item exchange server 300 determines to issue a transaction including the first item to the blockchain network 400, by transmitting the corresponding signal to the game server 200, the first It is possible to allow the first item to be moved from the user's inventory to the item storage space.

According to an embodiment of the present disclosure, the item exchange server 300 includes the block chain network 400 based on transaction condition information such as transaction type information included in a transaction request for a first item from a first user. A smart contract that can be operated on may be created and a transaction including the smart contract may be issued to the blockchain network 400 (430). For example, the transaction type information or transaction condition information may include at least one of an automatic purchase reservation transaction, an upper limit auction transaction, a rental transaction, a price designation general transaction, an advertisement generation transaction, and a donation generation transaction.

The item exchange server 300 is a private key of the item exchange server 300 or a private key of the game server 200 or corresponding information (for example, in the game server 200) from a first user who is the owner of the first item. Identification information for the first item of the product, etc.) may be received. Based on the received information, the game item server 300 may generate a smart contract and a transaction. The received information may be written to an input value (or input field) or an output value (or output field) of the transaction.

In an additional embodiment, the game server 200 allows a transaction to a temporary item accommodation space on the blockchain network 400 having an address/account corresponding to the item storage space in the game server 200. , The personal key of the game server 200 or the first user or information corresponding thereto (eg, identification information) may be transmitted to the item exchange server 300. The item exchange server 300 receiving such information creates a smart contract operable on the block chain network 400 based on the information received from the game server 200 and performs a transaction containing the smart contract on the block chain network. It can also be issued as (400).

As an additional embodiment, the item exchange server 300 may issue a smart contract and a transaction for performing a transaction of the first item using its own private key or corresponding information. In this case, the item exchange server 300 has the authority to interact with the blockchain network 400, and the item exchange server 300 performs an interaction with the blockchain network 400, and the result value 200) and/or the user terminal 100.

As described above, the item exchange server 300 is a private key associated with at least one of the first user, the item exchange server 300, and the game server 200 in order to perform an item transaction on the first item (or Corresponding arbitrary form of encryption information) can be used to create a transaction for moving the first item to the blockchain address associated with the temporary item accommodation space. In this case, the transaction may include a transaction input value including signature information generated from a private key, and a transaction output value including identification information for the first item and blockchain address information associated with the temporary item accommodation space. have.

In the present specification, the temporary item accommodation space having an address on the blockchain network 400 corresponds to the temporary item storage space (eg, in-game safe, public inventory, item transaction inventory, item exchange) of the game server 200 Can be. That is, since the transaction history for game items generated in the temporary item storage space implemented in the game server 200 can be stored in the temporary item storage space in the corresponding blockchain network, the reliability and integrity of the item transaction Can be secured.

As described above, the smart contract generated by the item exchange server 300 may be included in a block and distributed to the blockchain network 400. When a smart contract is distributed to the blockchain network 400, a contract account corresponding to the smart contract may be created. Such a contract account may store transaction information or transaction history information included in the item storage space of the game server 200. In addition, if a contract account has already been created, a new contract account is not created, and the transaction and smart contract can be recorded in the existing created contract account.

In addition, as the smart contract is stored in the contract account on the blockchain network 400, a procedure for the transaction of the first item may be performed on the blockchain network 400. For example, the contract account in which the smart contract is stored may include: the number of smart contracts created for item transaction, and a hash value for the byte code of the smart contract for item transaction. In addition, the address of the contract account may be generated based at least in part on the private key of at least one of the first user, the game server, and the item exchange server, or encryption information corresponding thereto. For example, the address of the contract account may be generated based on a public key paired with the private key of the item exchange server 300.

In one embodiment, a block distributed to the blockchain network 400 may include a smart contract for item transaction and item transaction history information. According to an embodiment of the present disclosure, when only the smart contract and item transaction details information are included in the block distributed to the blockchain network 400, the block size of the block chain can be minimized in performing item transactions. In addition, the generation time of the block and the propagation time of the block may be reduced, and computing resources for storage of the block may be reduced.

In addition, the smart contract is distributed to the blockchain network 400 based on a consensus algorithm by a plurality of nodes, wherein the plurality of nodes includes one or more external computing devices, one or more user terminals, one or more game servers, and It may include at least two of one or more item exchange servers.

In an embodiment of the present disclosure, when the item exchange server 300 operates off-chain, an item transaction procedure may be performed while performing an interaction with an external blockchain network. In addition, when the item exchange server 300 operates on-chain, the block chain network 400 may be included in the item exchange server 300.

The item exchange server 300 may receive a transaction request for the first item from a second user who wants to trade the first item after issuing a transaction to the blockchain network 400 (440). In an embodiment, the item exchange server 300 may receive a purchase request for the first item from a second user who has confirmed that the first item is a transaction target. For example, the item exchange server 300 may receive a transaction request (eg, a purchase request or a rental request) for a first item directly from the user terminal 100 of the second user. As another example, after the user terminal 100 of the second user transmits a purchase request for the first item to the game server 200, the item exchange server 300 is sent from the game server 200 to the second user. A signal indicating that a purchase request for the first item has been made may be received.

In one embodiment, the purchase request for the first item from the second user may be in the form of a message including an indication to purchase the first item, or a transaction that can be operated on the blockchain network 400 It may be in the form of.

In the former case, using the private key of the second user, the private key of the item exchange server 300 or the private key of the game server 200, or any corresponding encryption information based on the indication to be purchased, The item exchange server 300 may generate a transaction to be issued to the blockchain network 400.

In the latter case, it may be included in the transaction generated by the user terminal 100 and transmitted to the item exchange server 300 side. In this example, the user terminal 100 may include an API of any form capable of generating a transaction operable in the blockchain network 400, and the item exchange server 300 is the user terminal of the second user. It may play a role of delivering a transaction for performing item transaction generated in (100) to the blockchain network 400.

As an additional embodiment, the user terminal 100 of the second user may directly issue a transaction to the blockchain network 400, in this case, the item exchange server 300 through an interaction with the blockchain network 400 You can recognize the issuance of a transaction.

In an embodiment of the present disclosure, the item exchange server 300 may generate a transaction including a purchase request from a second user and issue it to the blockchain network 400 (450 ). By this transaction, the smart contract pre-stored in the blockchain network 400 may be called by step 430. As an example, after receiving a signal including an indication that the user wants to purchase the first item from the second user, the item exchange server 300 checks whether the signal satisfies the purchase condition presented by the first user. If satisfied, it is possible to create a transaction to call the smart contract. As another example, the item exchange server 300 may transmit a transaction generated by the second user to the blockchain network 400. As another example, the item exchange server 300 may convert a signal including an indication that the second user wants to purchase the first item into a transaction form operable on the blockchain network 400.

Although not shown in FIG. 4, as an additional embodiment, the item exchange server 300 may transmit to the game server 200 or the user terminal 100 of the first user that a purchase request from the second user is received. In this case, in response to receiving the transaction approval message from the first user, the item exchange server 300 may issue a transaction related to the second user for calling the smart contract to the blockchain network 400. If the transaction approval message from the first user is not received, the item exchange server 300 notifies the user terminal of the second user that the transaction is not approved, and performs a separate transaction to the blockchain network 400. May not be issued.

Although not shown in FIG. 4, as an additional embodiment, as a smart contract stored in the blockchain network 400 is executed, a message indicating that a purchase request from the second user has been received may be transmitted to the user terminal of the first user. . In this case, as the transaction approval message from the first user is issued to the blockchain network 400 in the form of a separate transaction, the smart contract may perform a transaction processing procedure. If the transaction approval message from the first user is not issued to the blockchain network 400 in the form of a separate transaction, the smart contract does not execute the transaction processing procedure, and the user terminal or game server of the second user ( 200) or the item exchange server 300 may be executed in a manner of delivering a notification that the transaction has not been made.

In one embodiment of the present disclosure, when the item exchange server 300 performs a settlement procedure for the transaction amount between the account of the first user and the account of the second user as the smart contract for item transaction is executed , In order to allow the first item to be moved from the temporary item storage space to the inventory of the second user in the game server 200, a signal may be transmitted to the game server 200 (460). For example, the game server 200 indicates that an item transaction has been performed between a first user and a second user as a smart contract is executed from the blockchain network 400 or from the item exchange server 300. 300), it may be determined to move the first item moved to the temporary item storage space in the game to the in-game inventory of the second user.

When the blockchain network 400 exists outside the game server 200, the game server 200 transfers transaction history information generated in the blockchain network 400 to the blockchain network 400 or the item exchange server 300. By receiving/acquiring from, the corresponding information may be reflected in the game server 200. Accordingly, item transaction history information in the item storage space of the game server 200 and item transaction history information in the temporary item accommodation space in the blockchain network 400 may be linked. In addition, when a difference in information between the item storage space of the game server 200 and the item accommodation space on the blockchain network 400 occurs, information is prioritized in the item accommodation space on the blockchain network 400. Can be determined. Accordingly, item transaction history information recorded in the item storage space in the game server 200 may be updated with item transaction history information recorded in the item accommodation space on the blockchain network 400. In this way, the transaction history of items with integrity on the blockchain network 400 may be reflected into the game server 200.

When the blockchain network 400 exists inside the item exchange server 300 (that is, when the item exchange server 300 manages the blockchain network 400), the item exchange server 300 performs internal communication. Through the block chain network 400, the updated/changed item transaction history may be transmitted to the game server 200.

In addition, when the first user cancels the sale of the first item or when the ownership of the first item is successfully transferred to the second user, the item exchange server 300, the game server 200 A signal for moving one item from the temporary item storage space to another location (in-game inventory of the first user or the second user) may be sent to the game server 200. Accordingly, the item exchange server 300 may allow the first item to be returned to a usable state in the game.

In one embodiment, the settlement procedure for the item transaction between the first user and the second user may be performed by the game server 200 or the item exchange server 300, or a smart contract in the blockchain network 400 itself. It may be performed according to the execution of For example, when the ownership of the first item is changed from a first user to a second user who wants to purchase the first item, the first user related to the first user from a second externally owned account related to the second user A procedure of generating a transaction or message for delivering at least a portion of the transaction cost of the first item to an externally owned account may be performed on the blockchain network. Through this procedure, information on the history of ownership change for the first item can be shared on the blockchain network 400, and settlement of the transaction cost accompanying the transaction for the first item is automatically made through the smart contract. I can.

[Description of Figure 5]

FIG. 5 exemplarily illustrates an item transaction method performed in a computing device in the blockchain network 400 according to an embodiment of the present disclosure.

FIG. 5 exemplarily shows an item transaction method performed in a computing device operating as a node constituting the block chain network 400, wherein the computing device includes a game server 200, an item exchange server 300, and a user terminal. It may mean 100 and/or an external computing device.

The computing device may receive a first transaction including a smart contract corresponding to a transaction request for a first item playable in the game from the first user (510). The smart contract may mean a smart contract operable on the blockchain network 400 to execute a transaction of the first item on the blockchain network 400.

According to an embodiment of the present disclosure, a smart contract for trading game items in a manner that guarantees integrity and stability and maximizes user convenience may include the following sub-contracts (or functions).

The smart contract ensures that the ownership of the first item belongs to the first user who requested the item transaction, and moves the first item to the temporary item accommodation space in the blockchain network 400 for item transaction. Can include 1 sub-contract. In addition, the first sub-contract may generate a signal for changing the first item to a state that is not usable in the game when the first item is moved to the temporary item accommodation space.

In one embodiment of the present disclosure, the smart contract determines whether the transaction condition of the first item is satisfied in response to a purchase request for the first item from a second user who wishes to purchase the first item, and When the transaction condition of the first item is satisfied, a second sub-contract for changing the ownership of the first item from the first user to the second user may be included. When the second sub-contract is executed, the owner of the first item on the blockchain network 400 may be changed from the first user to the second user and recorded.

In one embodiment of the present disclosure, the smart contract, when changing the ownership of the first item from the first user to a second user who wants to purchase the first item, a second externally owned account associated with the second user ( Or generating a transaction on the blockchain network for transferring at least a portion of the transaction cost of the first item from a wallet associated with the second user) to a first externally owned account associated with the first user (or a wallet associated with the first user) It may include a third sub-contract.

Additionally, when the ownership of the first item is changed, the third sub-contract may notify the game server 200 or the item exchange server 300 of settlement information on the transaction cost. In this case, the actual transaction cost may be settled by the game server 200 or the item exchange server 300 based on the notified information, and the calculated amount may be paid to the user. In this embodiment, the user does not need to have components such as a wallet on a separate blockchain network 400, and deposits and withdrawals are made to the game server 200 or the item exchange server 300.

In one embodiment of the present disclosure, the smart contract transfers the first item when the first user cancels the sale of the first item or when ownership of the first item is successfully transferred to the second user. It may include a fourth sub-contract that allows the first item to be returned to a usable state in the game by moving it from the temporary item accommodation space to another location. For example, when the fourth sub-contract is called as a first user issues a transaction to cancel the sale of the first item, the first item is a temporary item accommodation space in the blockchain network 400. A transaction or message for moving from the address of the first user to the address of the first user can be generated and issued to the blockchain network 400.

According to an embodiment of the present disclosure, when ownership of a first item is transferred to a second user, the smart contract transfers at least a portion of the sales amount of the first item to a predetermined externally owned account for receiving donations. It may include a fifth sub-contract that generates a transaction for the blockchain network. According to an embodiment of the present disclosure, when a first user issues a request to use at least part of the item transaction amount as a donation, or according to the policy of the game server 200 (item exchange server 300) When at least part of the transaction amount is to be used as a donation, information on the amount (or ratio) to be paid as the donation and an account or address on the blockchain network 400 to receive the donation may be recorded in the smart contract. Accordingly, the fifth sub-contract can be executed according to the donation-related information recorded in the smart contract.

In a further embodiment, the fifth sub-contract covers at least a portion of the costs that may be involved in operating the blockchain network 400, such as fees incurred for generating blocks and/or rewards paid to mining nodes. You may decide to use it as a donation. Accordingly, at least a portion of the commission cost incurred to generate the block may be automatically paid to a predetermined donation receipt account or address as the fifth sub-contract is executed, and the fifth sub-contract is a transaction or message for such payment. Can be created.

When the delivery of the donation to the predetermined externally owned account for receiving the donation is completed, balance information of the externally owned account that received the donation may be stored in the blockchain network 400. For example, balance information may be recorded in an externally owned account that received the donation.

As another example, the balance information may be stored in a DB for managing UTXO on the blockchain network 400, not an externally owned account, based on an Unspent Transaction Output (UTXO) method. In this case, the balance information can be confirmed as the total sum of UTXO through a search to the UTXO DB.

In one embodiment of the present disclosure, at least a portion of the sale amount of the first item or at least a portion of the fee to the blockchain network may be replaced with coins usable in the game or a specific asset in the game. For example, at least a portion of the sales amount of the first item or at least a portion of the fee to the blockchain network may be used as a prize money for a specific event (eg, tournament, etc.) in the game to which the first item belongs. . As another example, at least a portion of the sales amount of the first item or at least a portion of the commission to the blockchain network may be replaced with a capability value such as a character in the game of the seller or buyer of the first item.

In FIG. 5, the computing device may verify a first transaction issued to the blockchain network 400 and include the first transaction in a first block generated according to a predetermined consensus algorithm (520). Accordingly, the first block may be shared in the blockchain network 400. Verification of the first transaction may be performed based on information such as whether or not the subject that issued the first transaction has ownership of the first item.

Further, the verification of the first transaction may be performed based on private key information included in the input value of the first transaction and public key information paired with the private key. For example, in the case of a first transaction that includes a request for a transaction for the first item of the first user, the private key of the first user or the private key of the game server (item exchange server) or assigned to the first item Signing can be made with the registered private key. By using the signature information of the private key and the information of the public key corresponding to the private key (e.g., the private key is passed through a predetermined hash function (e.g., elliptic curve multiplication function) and compares the public key value By doing), verification of the first transaction can be made on the computing device. By using this public key infrastructure (PKI), it is possible to verify who is the entity that issued the transaction or the owner of the item.

In addition, the computing device may store the verified transaction in a transaction pool located in its local storage. In addition, the computing device may execute a consensus algorithm for generating a block containing transactions stored in a transaction pool located in its local storage. A corresponding transaction may be included in the generated block according to the consensus algorithm, and the generated block may be shared within the blockchain network 400. In addition, in one embodiment, the block distributed to the blockchain network may include a smart contract for performing item transaction and item transaction history information, so that the size of the block is reduced, and accordingly, the consensus time and computing resource usage are reduced. Can be reduced.

In the above-described manner, the smart contract may be included in a block and distributed to the blockchain network 400. In addition, when a smart contract is distributed to the blockchain network 400, a contract account corresponding to the smart contract may be created in the blockchain network 400. For example, the contract account in which the smart contract is stored may include the number of smart contracts created for item transaction, and a hash value for the byte code of the smart contract for item transaction, and the address value of the contract account May be generated based at least in part on the private key of at least one of the first user, the game server, and the item exchange server. Accordingly, as the smart contract is stored in the contract account on the blockchain network, a transaction for the first item can be performed on the blockchain network.

The computing device may allow the first item to be moved to a temporary item accommodation space having an address on the blockchain network 400 by executing the smart contract included in the first transaction (530).

According to an embodiment of the present disclosure, a transaction input value including signature information generated from the private key, and a transaction output including identification information for the first item and block chain address information associated with the temporary item accommodation space The first transaction containing the value can be recorded on the blockchain network.

As the first transaction is recorded in the blockchain network 400, the smart contract included in the first transaction may be executed. In the technique for performing item transaction according to an embodiment of the present disclosure, a more stable and efficient item transaction can be achieved by utilizing a separate temporary item accommodation space outside the management range of users. That is, when the smart contract is executed, the first item may be moved from a specific block chain address or account related to the first item to a temporary item accommodation space having a separate block chain address or account. In a further embodiment, according to an implementation aspect, the movement of the first item may mean that information on the first item is generated and registered in a temporary item accommodation space having a separate blockchain address or account.

In a further embodiment of the present disclosure, when a new update/change occurs as a block in the blockchain network 400 is stored, the computing device in the blockchain network 400 transmits the update/change content to the game server. 200 and/or the item exchange server 300 may be notified, or the game server 200 and/or the item exchange server 300 may be allowed to search for the corresponding update/change. Accordingly, the game server 200 and/or the item exchange server 300 may reflect the change history in the blockchain network 400 to their local storage. For example, the computing device of the blockchain network 400 transmits a message indicating that a transaction of a game item between a first user and a second user has been recorded in the blockchain network 400 as the smart contract is called. Alternatively, it may be delivered to the item exchange server 300. In response to this, the game server 200 may move the item located in the item storage space on its DB to the inventory of the second user.

The computing device may receive a second transaction corresponding to a purchase request for the first item from the second user (540 ). The second transaction may be issued from a second user or may be issued from a game server (item exchange server).

After verifying the second transaction, the computing device may share the second block within the blockchain network 400 by including the second transaction in the second block generated according to the consensus algorithm (550). The computing device may verify the second transaction and store the verified second transaction in a transaction pool located in its local storage. In addition, the computing device may execute a consensus algorithm for generating a block containing transactions stored in a transaction pool located in its local storage. A second transaction may be included in the generated block according to the consensus algorithm, and the generated block may be shared within the blockchain network 400.

As the block including the second transaction is shared, the computing device may call the smart contract recorded in the blockchain network 400, and accordingly, the smart contract may be executed (560). That is, in response to a transaction including a purchase request for the first item, generated from an externally owned account related to a second user who wishes to purchase the first item or related to the game server, the first item stored in the contract account The smart contract included in the first transaction may be called to perform the transaction. Accordingly, by executing at least one of the sub-contracts included in the smart contract, integrity is guaranteed and automated item transaction can be performed.

As the smart contract is executed, the computing device may perform a settlement procedure related to the transaction amount of the first item between the account of the first user and the account of the second user (570). For example, when ownership of a first item is transferred to a second user as a smart contract is executed, at least a portion of the sales amount of the first item is externally owned by the first user from the second user's externally owned account. A transaction or message to be delivered to the account may be generated on the blockchain network 400. In addition, as the smart contract is executed, a transaction or message for storing information indicating that ownership of the first item has been transferred from the first user to the second user may be recorded in the blockchain network 400. In addition, as the smart contract is executed, the first item may be moved from the temporary item accommodation space on the blockchain network 400 to a space associated with the second user on the blockchain network 400.

[Description of Figure 6]

6 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.

The flowchart shown in FIG. 6 exemplarily represents a game item transaction technique in which the game server 200, the item exchange server 300, and the blockchain network 400 operate as separate and separate entities. For features that overlap with the features described above with respect to FIGS. 3 to 5 among the features of the content illustrated in FIG. 6, the content described in FIGS. 3 to 5 will be referred to, and a description thereof will be omitted herein.

As illustrated in FIG. 6, the first user terminal 100a may transmit a transaction request for the first item to the item exchange server 300 (601 ). Additionally, the first user terminal 100a transmits a transaction request for the first item to the game server 200, and the game server 200 transmits (edits) the corresponding content to the item exchange server 300. An embodiment of is also possible.

The item exchange server 300 may transmit a storage request signal for the first item to the game server 200 (603). That is, the item exchange server 300 is transferred to the game server 200 in order to prevent the first item, which may be the target of the transaction, from being destroyed in the game or transferred to another person before propagating to the blockchain network 400 It is possible to transmit a storage request signal for the first item.

After receiving the storage request signal for the first item, the game server 200 may move the first item to the item storage space in the server (605 ). For example, the item storage space may mean a specific space (eg, a safe, etc.) in a game in which users can perform item transactions within the server. The game server may restrict the first item from being played in the game by moving the first item located in the inventory of the first user to the item storage space managed by the game server.

Additionally, the game server may notify users through UI/UX that the item moved to the item storage space in the server may be a transaction target. For example, a user who accesses the game server can access the item storage space in the game and check information on items subject to transaction.

The item exchange server 300 may create a smart contract for achieving the first item transaction on the blockchain network 400 based on the information included in the first item transaction request from the first user terminal 100a. And, it is possible to generate a transaction including the created smart contract (607).

When such a transaction is propagated to the blockchain network 400, the first item may be moved to a temporary item accommodation space on the blockchain network 400. Here, the movement to the temporary item accommodation space is the first item from the inventory account or address for the first item on the blockchain network 400 to the temporary account or address for item transaction on the blockchain network 400. Means to be moved. As another example, moving to the temporary item accommodation space may mean that a first item is newly registered in a temporary account or address for item transaction on the blockchain network 400.

In one embodiment of the present disclosure, in generating a transaction including a smart contract, at least one private key of the first user, the game server 200 and the item exchange server 300 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from the private key of the first user and the private key (ie, two private keys) of the exchange server 300. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the first user and a public key corresponding to the private key of the item exchange server 300 may be used.

As another example, when an ID and a password are input by a first user who has accessed the game server 200, and accordingly, the identity of the first user is authenticated in the game server 200, the game server 200 is an item exchange An authentication completion signal indicating that the first user's identity has been authenticated may be transmitted to the server 300. In this case, the item exchange server 300 may generate and issue a transaction using its own private key in response to receiving an authentication completion signal from the game server 200. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the item exchange server 300 may be used.

The blockchain network 400 may verify the transaction issued from the item exchange server 300 and share the transaction by including the transaction in a block generated through a consensus algorithm (609). By the above procedure, a transaction for the transaction of the first item can be recorded in the blockchain network 400, and information included in the recorded transaction can be stored in a state in which integrity can be guaranteed.

The item exchange server 300 may check whether a corresponding transaction has been recorded in the blockchain network 400 through the transaction ID (Tx ID) of the transaction issued by the item exchange server 300. As another example, the item exchange server 300 may receive a message indicating that a transaction issued by itself has been recorded from the blockchain network 400.

The item exchange server 300 may transmit a signal indicating that the first item is a transaction target to the game server 200 and/or the user terminals 100a and 100b (611). The signal indicating that such a transaction becomes a target may include, for example, identification information on the first item, transaction condition information on the first item, and/or address information of a contract account in which a smart contract related to the first item is stored. .

In an additional embodiment, the block chain network 400 may transmit a signal indicating that the generated block has been propagated to the game server 200 and/or the user terminals 100a and 100b after the generated block has been propagated.

The item exchange server 300 may notify information that the first item is a transaction target by updating a list of items available for trade in the item exchange server 300. In this case, the user terminals 100a and 100b may check the item to be traded by accessing the item exchange server 300 and checking the updated list of available items for trade.

The second user terminal 100b having confirmed the transaction condition for the first item may transmit a purchase request message for the first item to the item exchange server 300 (613). As an additional embodiment, a method in which the second user terminal 100b transmits a purchase request message for the first item to the game server 200 and the game server 200 transmits the content to the item exchange server 300 As a result, a purchase request message for the first item may be delivered. As an additional embodiment, an embodiment in which the second user terminal 100b directly issues a transaction including an item purchase request to the blockchain network 400 is also possible.

The item exchange server 300 may issue a transaction for calling a smart contract to the blockchain network 400 based on information included in the purchase request from the second user terminal 100b (615).

In one embodiment of the present disclosure, a transaction for calling a smart contract may include, for example, address information on a contract account in which the smart contract is stored. After issuing a transaction for moving the first item to the temporary item accommodation space so that the item exchange server 300 becomes a transaction target, the item exchange server 300 may obtain contract account information in which the smart contract included in the transaction is stored.

In one embodiment of the present disclosure, in generating a transaction for calling a smart contract, at least one private key of the second user, the game server 200 and the item exchange server 300 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from the private key of the second user and the private key (ie, two private keys) of the exchange server 300. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the second user and a public key corresponding to the private key of the item exchange server 300 may be used.

As another example, when an ID and a password are input by a second user who has accessed the game server 200, and accordingly, the identity of the second user is authenticated in the game server 200, the game server 200 is an item exchange An authentication completion signal may be transmitted to the server 300 informing that the second user's identity has been authenticated. In this case, the item exchange server 300 may generate and issue a transaction using its own private key in response to receiving an authentication completion signal from the game server 200. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the item exchange server 300 may be used.

In a further embodiment of the present disclosure, when issuing a transaction including the transaction intention of the second user, the item exchange server 300 checks the coin information in the externally owned account (or wallet) of the second user and , If the coin information is less than the price information of the first item, the issuance of the transaction may be canceled and the corresponding content may be transmitted to the second user terminal 100b.

The blockchain network 400 may verify the transaction issued from the item exchange server 300 and share the transaction by including the transaction in the block generated through the consensus algorithm (617). By the above procedure, a transaction for purchasing the first item may be recorded in the blockchain network 400, and information included in the recorded transaction may be stored in a state where integrity can be guaranteed. Also, as the transaction for purchasing the first item is recorded, the smart contract may be called and executed based on information for calling the smart contract included in the transaction.

As the smart contract in the blockchain network 400 is executed, the ownership of the first item is changed to the second user, and at least a part of the transaction amount of the first item is transferred from the account of the second user to the account of the first user. And the first item may be moved from the temporary item accommodation space to the address associated with the second user on the blockchain network 400. In an additional embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract, so that information about such changes and movements can be recorded in the blockchain network 400. have.

According to the above-described methods, the item transaction record on the blockchain network is completed (617), and the item transaction procedure proceeds, and the cost associated with the item transaction can be automatically settled (619).

When the item transaction record on the blockchain network is completed, the item exchange server 300 or the blockchain network 400 controls the first item to the game server 200 and/or the user terminals 100a, 100b. The content that the transaction between the first user and the second user has been completed may be transmitted (621).

In this case, the game server 200 moves the first item located in the item storage space in the game server 200 to a second user inventory that can be managed by the second user in the game server 200. Can be (623).

In a further embodiment, in response to receiving a separate item transfer notification from the second user terminal 100b, the game server 200 plays the first item located in the item storage space in the game server 200. It may be moved to a second user inventory that can be managed by the second user in the server 200.

The item exchange server 300 may store the updated transaction history information on its own DB so that the user terminals 100a and 100b can check that the transaction amount has been settled (or the transaction has been completed) (625). . In this way, the user terminals 100a and 100b may access the item exchange server 300 to check transaction history information.

In an embodiment of the present disclosure, the item exchange server 300 may compare transaction history information stored in its DB with transaction history information recorded in the blockchain network 400. Based on this comparison, if there is a difference between the transaction history information recorded in the blockchain network 400 and the transaction history information stored in the DB, the item exchange server 300 is recorded in the blockchain network 400. Priority is given to the transaction history information. In this case, for example, the item exchange server 300 may replace the transaction history information recorded in its DB with the transaction history information recorded in the blockchain network 400.

[Description of Figure 7]

7 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.

The flowchart shown in FIG. 7 exemplarily represents a game item transaction technique in which the game server 200 including the function of the item exchange server and the blockchain network 400 operate as separate and separate entities. The embodiment in Fig. 7 exemplarily shows an embodiment in which an item exchange server is integrated into a game server.

For features that overlap with the features described above with respect to FIGS. 3 to 6 among the features of the content illustrated in FIG. 7, the content described in FIGS. 3 to 6 will be referred to, and a description thereof will be omitted here.

As illustrated in FIG. 7, the first user terminal 100a may transmit a transaction request for the first item to the game server 200 (701 ). Additionally, the first user terminal 100a issues a transaction including a transaction request for the first item to the block chain network 400, and the game server 200 sends the block chain network 400 or the first user terminal ( An embodiment of receiving the content from 100a) is also possible.

The game server 200 stores the first item in the first user's inventory in order to prevent the first item, which may be a transaction object, from being destroyed in the game or transferred to another person before being propagated to the blockchain network 400. It can be transferred to a separate item storage space in the game server 200 (703). In this case, the ownership of the first item remains with the first user, but the first item may be processed in the game server 200 so that the first item cannot be played in the game.

The game server 200 analyzes the transaction request information for the first item from the first user, generates a smart contract reflecting the transaction request information, and issues the generated smart contract to the blockchain network 400. There is (705).

In one embodiment of the present disclosure, in generating a transaction for invoking a smart contract, at least one private key of the first user and the game server 200 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from a private key of the first user and a private key (ie, two private keys) of the game server 200. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the first user and a public key corresponding to the private key of the game server 200 may be used.

As another example, when an ID and a password are input by a first user who has accessed the game server 200, and accordingly, the first user's identity authentication is performed in the game server 200, the game server 200 You can create and issue transactions using your private key. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the game server 200 may be used.

The blockchain network 400 may verify the transaction issued from the game server 200 and share the transaction by including the corresponding transaction in a block generated through a consensus algorithm (707). By this procedure, a transaction for the transaction of the first item may be recorded in the blockchain network 400, and information included in the recorded transaction may be stored in a state in which integrity can be guaranteed.

The game server 200 may check whether a corresponding transaction has been recorded in the blockchain network 400 through the transaction ID (Tx ID) of the transaction issued by the game server 200. As another example, the game server 200 may receive a message indicating that a transaction issued by itself has been recorded from the blockchain network 400.

The game server 200 may transmit a signal indicating that the first item is a transaction target to the user terminals 100a and 100b (709). The signal indicating that such a transaction becomes a target may include, for example, identification information on the first item, transaction condition information on the first item, and/or address information of a contract account in which a smart contract related to the first item is stored. . The user terminals 100a and 100b may access the game server 200 and check a list of game items subject to transaction and transaction history information.

As another embodiment, the user terminals 100a and 100b may directly issue a query to the blockchain network 400 using the Tx ID provided from the game server 200. Accordingly, the user terminals 100a and 100b can check the transaction history and transaction conditions for desired items on the blockchain network 400.

The second user terminal 100b having confirmed the transaction condition for the first item may transmit a purchase request message for the first item to the game server 200 (711). As an additional embodiment, the second user terminal 100b directly transmits a transaction including a purchase request message for the first item to the blockchain network 400, and the game server 200 connects the blockchain network 400. The purchase request message for the first item may be delivered by transmitting the corresponding content through the method.

The game server 200 may generate and issue a transaction for calling a smart contract to the blockchain network 400 based on information included in the purchase request from the second user terminal 100b (713).

In one embodiment of the present disclosure, a transaction for invoking a smart contract may include, for example, signature information, and address information for a contract account in which the smart contract is stored. After issuing a transaction for moving the first item to the temporary item accommodation space so that the first item becomes a transaction target, the game server 200 may obtain contract account information in which the smart contract included in the transaction is stored.

In one embodiment of the present disclosure, in generating a transaction for invoking a smart contract, at least one private key of the second user and the game server 200 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from the private key of the second user and the private key (ie, two private keys) of the game server 200. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the second user and a public key corresponding to the private key of the game server 200 may be used.

As another example, when the second user's identity is authenticated by the second user who has accessed the game server 200, the game server 200 may generate and issue a transaction using its own private key. In this situation, when a corresponding transaction is to be verified in the blockchain network 400, a public key corresponding to the private key of the game server 200 may be used.

In a further embodiment of the present disclosure, when issuing a transaction including a transaction intention of the second user, the game server 200 checks coin information in the externally owned account (or wallet) of the second user, If the coin information is less than the price information of the first item, the issue of the transaction may be canceled and the corresponding content may be transmitted to the second user terminal 100b.

The blockchain network 400 may verify the transaction issued from the game server 200 and share the transaction by including the corresponding transaction in a block generated through a consensus algorithm (715). By the above procedure, a transaction for purchasing the first item may be recorded in the blockchain network 400, and information included in the recorded transaction may be stored in a state where integrity can be guaranteed. Also, as the transaction for purchasing the first item is recorded, the smart contract may be called and executed based on information for calling the smart contract included in the transaction.

As the smart contract in the blockchain network 400 is executed, the ownership of the first item is changed to the second user, and at least a part of the transaction amount of the first item is transferred from the account of the second user to the account of the first user. And the first item may be moved from the temporary item accommodation space to the address associated with the second user on the blockchain network 400. In an additional embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract, so that information about such changes and movements can be recorded in the blockchain network 400. have.

As the smart contract in the blockchain network 400 is executed, the ownership of the first item is changed to the second user, and at least a part of the transaction amount of the first item is transferred from the account of the second user to the account of the first user. And the first item may be moved from the temporary item accommodation space to the address associated with the second user on the blockchain network 400. In an additional embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract, so that information about such changes and movements can be recorded in the blockchain network 400. have.

According to the above-described methods, the item transaction record on the blockchain network is completed (715), and the item transaction procedure is in progress, and the cost associated with the item transaction can be automatically settled (719).

When the item transaction record on the blockchain network is completed, the blockchain network 400 or the game server 200 completes the transaction between the first user and the second user for the first item to the user terminals 100a and 100b. You can convey the content that you have become. In addition, the blockchain network 400 may transmit the content that the transaction for the first item has been completed to the game server 200. In addition, the game server 200 may issue a query to the blockchain network 400 using the Tx ID to check the transaction history for the first item.

The game server 200 may move the first item located in the item storage space in the game server 200 to a second user inventory that can be managed by a second user in the game server 200 ( 717).

In a further embodiment, in response to receiving a separate item transfer notification from the second user terminal 100b, the game server 200 plays the first item located in the item storage space in the game server 200. It may be moved to a second user inventory that can be managed by the second user in the server 200.

The game server 200 may store updated transaction history information on its own DB so that the user terminals 100a and 100b can confirm that the transaction amount has been settled (or the transaction has been completed) (721). In this way, the user terminals 100a and 100b may access the game server 200 to check transaction history information.

In an embodiment of the present disclosure, the game server 200 may compare transaction history information stored in its DB with transaction history information recorded in the blockchain network 400. Based on this comparison, if there is a difference between the transaction history information recorded in the blockchain network 400 and the transaction history information stored in the DB, the game server 200 is recorded in the blockchain network 400. Priority is given to transaction history information. In this case, for example, the game server 200 may replace transaction history information recorded in its DB with transaction history information recorded in the blockchain network 400.

[Description of Figure 8]

8 shows an exemplary flowchart of an item transaction method according to an embodiment of the present disclosure.

The flow chart shown in FIG. 8 exemplarily represents a game item transaction technique operated by the game server 200 including the function of an item exchange server and a blockchain network. The embodiment in Fig. 8 exemplarily shows an embodiment in which an item exchange server and a blockchain network are integrated into a game server. In the embodiments of FIG. 8, since the game server 200 includes a blockchain network inside, functions such as transaction verification, block generation, consensus algorithm execution, and block propagation in the blockchain network are provided by the game server 200. Can be done by

For features that overlap with the features described above with respect to FIGS. 3 to 7 among the features of the content illustrated in FIG. 8, the content described in FIGS. 3 to 7 will be referred to, and a description thereof will be omitted herein.

As illustrated in FIG. 8, the first user terminal 100a may transmit a transaction request for the first item to the game server 200 (801 ).

The game server 200 stores a separate item in the game server 200 from the inventory of the first user in order to prevent the first item from being destroyed in the game or transferred to another person after the first item becomes a transaction target. It can be transferred to space (803). In this case, the ownership of the first item remains with the first user, but the first item may be processed in the game server 200 so that the first item cannot be played in the game.

The game server 200 may analyze transaction request information for a first item from a first user, generate a smart contract reflecting the transaction request information, and generate a transaction including the generated smart contract (805). ).

The game server 200 may issue a transaction to a blockchain network, and the transaction may be propagated and recorded in the blockchain network (807). The first item may be moved to the temporary item accommodation space having the address of the blockchain network by the corresponding transaction. In addition, it may be recorded that the first item is a transaction target on the blockchain network by the corresponding transaction.

The game server 200 may include a blockchain network. That is, the game server 200 may include a plurality of computing devices, and two or more of the plurality of computing devices may form a blockchain network.

Since the blockchain network is managed by one entity called the game server 200, in this case, the blockchain network can operate as a private blockchain. In the case of operating as a private blockchain, since the blockchain network is implemented by fewer nodes than the public blockchain under the management of the game server 200, the verification and consensus process is faster and the user experience in performing item transactions is reduced. Not only can it be increased, it can be possible to efficiently utilize network resources and computing resources.

Blockchain network managed by the game server 200, and nodes on the network can share verified and distributed ledgers (e.g., block or intra-block data), and accordingly, forgery and alteration of data, a key feature of blockchain technology The advantage of becoming impossible can be achieved.

Here, the blockchain network managed by the game server 200 means that only computing devices owned by the game server 200 can configure the blockchain network as authorized nodes, but additionally control the game server 200 External nodes underneath or external nodes with permission from the game server 200 may also form a blockchain network.

As an additional embodiment, the game server 200 and the item exchange server 300 may form a blockchain network in the form of a consortium. In this embodiment, a blockchain network may be configured under the control of a plurality of entities or institutions, such as the game server 200 and the item exchange server 300, and each entity has the same or different authority within the blockchain network. Can have. For example, if each entity has different rights, only nodes related to the game server 200 can participate in the consensus process, and nodes related to the item exchange server 300 will only perform a role of creating or verifying a transaction. May be.

The game server 200 transmits a signal indicating that the first item is a transaction target to the user terminals 100a and 100b or uploads the content to the game server 200 to the user terminals 100a and 100b. It may be notified that the first item is a transaction target (809). The signal that such a transaction target is, for example, identification information for the first item, information on transaction conditions for the first item, information on the owner of the first item, transaction ID information on the blockchain network related to the first item, and The smart contract related to the first item may include at least one of address information of a contract account in which the smart contract is stored. The user terminals 100a and 100b may access the game server 200 and check a list of game items subject to transaction and transaction history information.

After issuing a transaction for moving the first item to the temporary item accommodation space so that the first item becomes a transaction target, the game server 200 may obtain contract account information in which the smart contract included in the transaction is stored.

The second user terminal 100b having confirmed the transaction condition for the first item may transmit a purchase request message for the first item to the game server 200 (811).

The game server 200 may generate and issue a transaction for calling a smart contract through a blockchain network based on information included in the purchase request from the second user terminal 100b (813).

In one embodiment of the present disclosure, the transaction for invoking a smart contract may include, for example, private key information (signature information) of a second user or game server, and address information for a contract account in which the smart contract is stored. have.

In one embodiment of the present disclosure, in generating a transaction for invoking a smart contract, at least one private key of the second user and the game server 200 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from the private key of the second user and the private key (ie, two private keys) of the game server 200. In this situation, when a corresponding transaction is to be verified in a blockchain network, a public key corresponding to the private key of the second user and a public key corresponding to the private key of the game server 200 may be used.

As another example, when the second user's identity is authenticated by the second user who has accessed the game server 200, the game server 200 may generate and issue a transaction using its own private key. In this situation, when a corresponding transaction is to be verified on the blockchain network of the game server 200, a public key corresponding to the private key of the game server 200 may be used.

The transaction issued in the blockchain network of the game server 200 is verified, and the corresponding transaction may be included in the block generated through the consensus algorithm and shared (815). By the above procedure, a transaction for purchasing the first item can be recorded in the blockchain network of the game server 200, and information included in the recorded transaction can be stored in a state in which integrity can be guaranteed. Also, as the transaction for purchasing the first item is recorded, the smart contract may be called and executed based on information for calling the smart contract included in the transaction.

When the item transaction record on the blockchain network is completed, the game server 200 may transmit the information that the transaction between the first user and the second user for the first item has been completed to the user terminals 100a and 100b.

In addition, the game server 200 may issue a query to the blockchain network (based on internal communication) using the Tx ID to check the transaction history for the first item. In this case, the game server 200 may allow the user terminals 100a and 100b accessing the game server 200 to check the transaction information by uploading the transaction information to its own DB.

The game server 200 may move the first item located in the item storage space in the game server 200 to a second user inventory that can be managed by a second user in the game server 200 ( 817).

In a further embodiment, in response to receiving a separate item transfer notification from the second user terminal 100b, the game server 200 plays the first item located in the item storage space in the game server 200. It may be moved to a second user inventory that can be managed by the second user in the server 200.

As the smart contract in the blockchain network of the game server 200 is executed, the ownership of the first item is changed to the second user, and at least a part of the transaction amount of the first item is transferred from the account of the second user to the first The first item may be transferred to the user's account, and the first item may be moved from the temporary item accommodation space having an address on the blockchain network to the address associated with the second user, thereby enabling the item transaction cost settlement procedure (819). .

The game server 200 may store updated transaction history information on its own DB so that the user terminals 100a and 100b can confirm that the transaction amount has been settled (or the transaction has been completed) (821). In this way, the user terminals 100a and 100b may access the game server 200 to check transaction history information.

[Description of Figure 9]

9 shows an exemplary flow chart of an item transaction method according to an embodiment of the present disclosure.

The flow chart shown in FIG. 9 exemplarily represents a game item transaction technique operated by the game server 200 and the item exchange server 300 (including the function of the blockchain network). The embodiment in FIG. 9 exemplarily shows an embodiment in which a block chain network is integrated with an item exchange server 300 that is an entity separate from the game server 200. In the embodiments of FIG. 9, since the item exchange server 300 includes a blockchain network inside, functions such as transaction verification, block generation, consensus algorithm execution, and block propagation in the blockchain network are provided by the item exchange server ( 300).

For features that overlap with the features described above with respect to FIGS. 3 to 8 among the features of the content illustrated in FIG. 9, the content described in FIGS. 3 to 8 will be referred to, and description thereof will be omitted.

As illustrated in FIG. 9, the first user terminal 100a may transmit a transaction request for the first item to the item exchange server 300 (901 ).

The item exchange server 300 may transmit a storage request message for the first item to the game server 200 (903).

The game server 200 stores a separate item in the game server 200 from the inventory of the first user in order to prevent the first item from being destroyed in the game or transferred to another person after the first item becomes a transaction target. It can be transferred to space (905). In this case, the ownership of the first item remains with the first user, but the first item may be processed in the game server 200 so that the first item cannot be played in the game.

The item exchange server 300 analyzes the transaction request information for the first item from the first user, creates a smart contract in which the transaction request information is reflected, and creates a transaction including the generated smart contract, and uses a block chain. Can be issued over the network (907).

The first item may be moved to the temporary item accommodation space having the address of the blockchain network by the corresponding transaction. In addition, it may be recorded that the first item becomes a transaction target on the blockchain network by the corresponding transaction.

As described above, the item exchange server 300 may include a blockchain network. The item exchange server 300 may include a plurality of computing devices, and two or more of the plurality of computing devices may form a blockchain network.

Since the blockchain network is managed by one entity called the item exchange server 300, in this case, the blockchain network can operate as a private blockchain. In the case of operating as a private blockchain, since the blockchain network is implemented by fewer nodes than the public blockchain under the management of the item exchange server 300, the verification and consensus process is faster, and the user experience in performing item transactions. Not only can this increase, but also efficient use of network resources and computing resources can be made possible.

The blockchain network managed by the item exchange server 300, and nodes on the network can share verified and distributed ledgers (e.g., block or intra-block data). The advantage that modulation becomes impossible can be achieved.

Here, the blockchain network managed by the item exchange server 300 means that only computing devices owned by the item exchange server 300 can configure the blockchain network as an authorized node, but additionally, the item exchange server 300 External nodes under the control of) or external nodes authorized by the item exchange server 300 may also form a blockchain network.

As an additional embodiment, the game server 200 and the item exchange server 300 may form a blockchain network in the form of a consortium. In this embodiment, a blockchain network may be configured under the control of a plurality of entities or institutions, such as the game server 200 and the item exchange server 300, and each entity has the same or different authority within the blockchain network. Can have. For example, if each entity has a different authority, only nodes related to the item exchange server 300 can participate in the consensus process, and nodes related to the game server 200 only play a role of creating or verifying transactions. May be.

The item exchange server 300 transmits a signal indicating that the first item is a transaction target to the user terminals 100a and 100b and the game server 200, or uploads the corresponding content to its own DB. It can be announced that it is subject to a transaction (911). The signal that such a transaction target is, for example, identification information for the first item, information on transaction conditions for the first item, information on the owner of the first item, transaction ID information on the blockchain network related to the first item, and The smart contract related to the first item may include at least one of address information of a contract account in which the smart contract is stored. The user terminals 100a and 100b may access the item exchange server 300 and/or the game server 200 to check a list of game items subject to transaction and transaction history information.

After issuing a transaction for moving the first item to the temporary item accommodation space so that the item exchange server 300 becomes a transaction target, the item exchange server 300 may obtain contract account information in which the smart contract included in the transaction is stored.

The second user terminal 100b having confirmed the transaction condition for the first item may transmit a purchase request message for the first item to the item exchange server 300 (913 ).

The item exchange server 300 may generate and issue a transaction for calling a smart contract to a blockchain network based on information included in the purchase request from the second user terminal 100b (915).

In one embodiment of the present disclosure, the transaction for invoking a smart contract may include, for example, private key information (signature information) of a second user or game server, and address information for a contract account in which the smart contract is stored. have.

In one embodiment of the present disclosure, in generating a transaction for calling a smart contract, at least one private key of the second user and the item exchange server 300 may be used. The signature based on the private key can be recorded in the input of the transaction.

For example, a transaction may be generated through a signature from the private key of the second user and the private key (ie, two private keys) of the item exchange server 300. In this situation, when a corresponding transaction is to be verified in a blockchain network, a public key corresponding to the private key of the second user and a public key corresponding to the private key of the item exchange server 300 may be used.

As another example, when the second user's identity is authenticated by the second user who has accessed the game server 200, the game server 200 may notify the item exchange server 300 that the second user has been authenticated. In this case, the item exchange server 300 may generate and issue a transaction using its own private key. In this situation, when a corresponding transaction is to be verified in a blockchain network, a public key corresponding to the private key of the item exchange server 300 may be used.

Additionally, when the second user's identity is authenticated by the second user who has accessed the game server 200, the game server 200 informs the item exchange server 300 that the second user has been authenticated and Can also be delivered. In this case, the item exchange server 300 may generate and issue a transaction using its own private key and the private key of the game server 200. In this situation, when a corresponding transaction is to be verified in a blockchain network, a public key corresponding to the private key of the item exchange server 300 and a public key corresponding to the private key of the game server 200 may be used.

The transaction issued in the blockchain network of the item exchange server 300 is verified, and the corresponding transaction may be included in the block generated through the consensus algorithm and shared (917). By this procedure, a transaction for the purchase of the first item may be recorded in the blockchain network of the item exchange server 300, and information included in the recorded transaction may be stored in a state in which integrity can be guaranteed. . Also, as the transaction for purchasing the first item is recorded, the smart contract may be called and executed based on information for calling the smart contract included in the transaction.

When the item transaction record on the blockchain network of the item exchange server 300 is completed, the cost for the item transaction between the first user and the second user may be automatically settled (919). As the smart contract in the blockchain network of the item exchange server 300 is executed, the ownership of the first item is changed to the second user, and at least part of the transaction amount of the first item is deducted from the account of the second user. The first item is transferred to the user's account, and the first item can be moved from the temporary item accommodation space having the address on the blockchain network to the address associated with the second user, thereby enabling the item transaction cost settlement procedure.

The item exchange server 300 may transmit the content that the transaction between the first user and the second user for the first item has been completed to the game server 200 and/or the user terminals 100a and 100b (921).

In addition, the item exchange server 300 and/or the game server 200 may issue a query to the blockchain network using the Tx ID to check the transaction history for the first item. In this case, the item exchange server 300 and/or the game server 200 allows the user terminals 100a and 100b accessing the game server 200 to check this by uploading the transaction information to their DB. can do.

The game server 200 may move the first item located in the item storage space in the game server 200 to a second user inventory that can be managed by a second user in the game server 200 ( 923).

In a further embodiment, in response to receiving a separate item transfer notification from the second user terminal 100b, the game server 200 plays the first item located in the item storage space in the game server 200. It may be moved to a second user inventory that can be managed by the second user in the server 200.

The item exchange server 300 may store updated transaction history information on its own DB so that the user terminals 100a and 100b can check the content that the transaction amount has been settled (or the content that the transaction has been completed) (925). . Additionally, the item exchange server 300 may transmit the content that the transaction has been completed to the game server 200, and the game server 200 may reflect this on its own DB. In this way, the user terminals 100a and 100b may access the item exchange server 300 or the game server 200 to check transaction history information.

[Description of Figure 10]

10 exemplarily shows an item transaction method in the blockchain network 400 according to an embodiment of the present disclosure. FIG. 10 exemplarily shows how the blockchain network 400 operates in response to receiving a transaction in order to perform a game item transaction.

The client A (1000a) and the client B (1000b) in FIG. 10 may correspond to at least one of the game server 200, the item exchange server 300, and the user terminals 100a and 100b.

Client A 1000a may generate a first transaction 1010 for requesting an item transaction. Client A (1000a) may generate a smart contract to reflect this in accordance with the input to various transaction types, and may include the generated smart contract in the first transaction 1010.

The first transaction 1010 may include, for example, information on the owner of the first item and the transaction price of the first item (eg, sales price: 20 Coins). Additionally, private key information related to the client A 1000a may be added to the first transaction 1010 in the form of a signature, and destination information of the first transaction 1010 may be included.

The client A 1000a may include the private key-based signature value in the first transaction 1010 and issue it to the blockchain network 4000 (1003).

Nodes (computing devices) 400a, 400b, 400c, and 400d constituting the blockchain network 400 may receive, propagate and share the first transaction 1010 (1005).

The nodes 400a, 400b, 400c and 400d constituting the blockchain network 400 may include a transaction DB and a smart contract DB. The nodes 400a, 400b, 400c, and 400d may share an arbitrary type of transaction for allowing item transaction and store the corresponding content in the transaction DB. In the case of the blockchain network 400 that can support smart contracts, it is possible to execute an application related to the smart contract according to the content of the transaction and reflect the result in the smart contract DB.

Nodes 400a, 400b, 400c, and 400d may competitively generate a first block that can contain one or more transactions including the first transaction 1010 based on the consensus algorithm, and in the example in FIG. 10 It is shown as an example that the node 400b first generates the first block (1007).

The node 400b may propagate the generated first block to be shared in the blockchain network 400 (1009).

The nodes 400a, 400c, and 400d verify the received first block and store the first block in their local storage, so that the first block on the blockchain network 400 may be shared (1011).

The first transaction 1010 included in the first block may include a smart contract generated based on a transaction request from the client A 1000a. As the first block is shared with the blockchain network 400, the smart contract included in the first block can be executed, and accordingly, the first item that can be a transaction target is a temporary item accommodation space having the address of the blockchain network. It can be moved to (1013).

The client B 1000b may generate a second transaction 1020 for a purchase request for the first item (1015).

The client B 1000b may transmit the second transaction 1020 signed with the private key to the blockchain network 400 (1017).

The second transaction 1020 includes, for example, identification information for the first item, a purchase indication for the first item, a contract account in which the smart contract included in the first transaction is stored, information for calling the smart contract, and/or It may include the transaction price of the first item (eg, purchase price: 20 Coin).

Like the first transaction 1010, the second transaction 1020 may also be propagated and shared with the blockchain network 400.

The nodes 400a, 400b, 400c, and 400d may competitively generate a second block that can contain one or more transactions including the second transaction 1020 based on the consensus algorithm, and in the example of FIG. 10 It is shown as an example that the node 400c first generates the second block (1019).

The node 400c may allow the second block to be shared by the nodes 400a, 400b, and 400d by propagating the generated second block to the blockchain network 400 (1021 and 1023).

The nodes 400a, 400b, 400c, and 400d may store the contents of the second transaction 1020 for allowing item transactions in their own transaction DB.

When the second transaction 1020 is recorded in the blockchain network 400, the nodes 400a, 400b, 400c and 400d by the second transaction 1020 refer to the smart contract included in the first transaction 1010. By calling, the smart contract can be executed (1025).

As the smart contract is executed, the ownership change and sales amount settlement procedure proceeds, and the nodes 400a, 400b, 400c, and 400d can perform the procedure and store the data generated by the procedure in their DB. (1027).

The above-described embodiments of FIG. 10 represent the operation of an exemplary blockchain network 400 for performing an item registration procedure and an item purchase procedure for item transaction. Hereinafter, an exemplary item inquiry procedure for item transaction Describes the process (item search operation method).

Regarding the item inquiry operation, when a client A or B (1000a or 1000b) sends a search query, a node in the blockchain network 400 that has received the query may respond to it.

In the case of the item search operation, since the state value stored in the smart contract DB can be searched without changing the data of the blockchain, the query information for such search does not need to be synchronized with the blockchain. Therefore, the nodes of the blockchain network 400 can check their DB for the query and immediately respond to the query regardless of the block synchronization timing. As described above, the processing of the search query in the blockchain network 400 is because the response to the query is performed using the internal DB of the node that received the query, and the same result can be obtained no matter which node is accessed. , Query response speed may be faster than query response service through a relay.

[Description of Figure 11]

11 shows an exemplary UI (User Interface) configuration 1100 for performing item transaction in a user terminal according to an embodiment of the present disclosure. The UI configuration 1100 in FIG. 11 may be a screen that is output when a sales tab is input. The UI configuration 1100 may be generated by the game server 200 or the item exchange server 300.

The UI configuration 1100 shown in FIG. 11 exemplarily shows a screen displayed on the user terminal 100 for requesting item sales. 11 illustrates an example of the sale of game items, it will be apparent to those skilled in the art that various types of item transactions, such as item rental, may also be included within the scope of the present disclosure.

The user terminal 100 may access the game server 200 or the item exchange server 300 and perform an interaction based on the UI configuration 1100. Additionally, when a predetermined input behavior for a specific item is received from the user terminal 100, the game server 200 or the item exchange server 300 outputs an exchange UI configuration 1100 for the transaction for the item. I can.

Through this UI configuration 1100, information on the type of item, the sale price of the item, and the sale quantity of the item may be input from the user terminal 100.

As shown in Fig. 11, the UI configuration 1100 for allowing the sale of a game item displays identification information (image or text) of an item, a sale price of the item, and a sale quantity of the item. , Display item maximum sale limit information, display the average sale price for the item, display fee information incurred during sale, display the amount of coins currently held by the user, and display the registration and cancellation tabs for item sales And/or an input tab for inputting the price and quantity of the item may be displayed. The above-described displays and tabs may be output in one screen or may be output through a separate screen.

As described above, based on the information for item transaction input from the user terminal 100, the game server 200 or the item exchange server 300 creates a smart contract and performs a transaction including the generated smart contract. Can be issued.

In addition, when input of information for item transaction from the user terminal 100 is completed, the game server 200 may limit the user's game play by moving the item to the item storage space in the game.

Although not shown in FIG. 11, the UI configuration 1100 may display information on transaction content of an item. For example, transaction content information of an item may be expressed in a separate tab, and in that tab, a transaction history for a specific item and item transaction history information for a specific user may be displayed.

[Description of Figure 12]

12 illustrates an exemplary UI configuration for performing item transaction in a user terminal according to an embodiment of the present disclosure.

12 illustrates an exemplary UI (User Interface) configuration 1200 for performing item transaction (eg, purchase) in a user terminal according to an embodiment of the present disclosure. The UI configuration 1200 in FIG. 12 may be a screen that is output when a purchase tab is input.

The UI configuration 1200 may be generated by the game server 200 or the item exchange server 300.

The UI configuration 1200 illustrated in FIG. 12 exemplarily shows a screen displayed on the user terminal 100 for requesting an item purchase. The user terminal 100 may access the game server 200 or the item exchange server 300 and perform an interaction based on the UI configuration 1200.

Through this UI configuration 1100, search queries related to the type of item, the sale price of the item, and the sale quantity information of the item can be input from the user terminal 100, and the UI configuration 1200 is based on this input. It can be changed to be able to interact with the user.

As shown in FIG. 12, the game server 200 or the item exchange server 300 as the user terminal 100 includes item names, item categories (categories), item types, item ratings, and item alignment. Rules, and/or maximum price information of an item may be displayed. In addition, the UI configuration 1200 may include an input tab for a search condition, an Enter tab for an item search, and an output tab for an item search result. Based on this UI configuration 1200, a search/inquiry query from the user terminal 100 may be generated.

In addition, based on the search/query query information input from the user terminal 100, the game server 200 or the item exchange server 300 may output result information corresponding to the search/query query. As shown in the right screen of FIG. 12, the result information may include item identification information, item owner information, sales condition information, and/or sales price information.

These displays and tabs may be output in one screen or may be output through a separate screen.

As described above, when input of information for item transaction from the user terminal 100 is completed, based on the information for item transaction input from the user terminal 100, the game server 200 or the item exchange server ( 300) can issue a transaction to call an existing smart contract. By such a transaction, a reliable and automated item transaction on the blockchain network 400 can be performed. In addition, when the item transaction is completed, the game server 200 may move the item from the item storage space to the inventory of the second user and output it.

[Description of Figure 13]

13 exemplarily shows an aspect in which the smart contract 1300 is propagated to the blockchain network 400 according to an embodiment of the present disclosure.

As shown in FIG. 13, in one embodiment, a smart contract for performing a transaction of a game item on the blockchain network 400 is, for example, a first sub-contract 1310 and a second sub-contract 1320. ), a third sub-contract 1330, a fourth sub-contract 1340, and a fifth sub-contract 1350.

According to an embodiment of the present disclosure, a smart contract can achieve transaction of game items in a manner that guarantees integrity and stability and maximizes user convenience. In the present specification, a sub-contract is a component constituting a smart contract, and may mean a group of codes or a function (including a group of functions) performing a specific function.

The smart contract ensures that the ownership of the first item belongs to the first user who requested the item transaction, and moves the first item to the temporary item accommodation space in the blockchain network 400 for item transaction. May contain sub-contracts. In a further embodiment, the first sub-contract may generate a signal to cause the first item to be changed to a state that is not usable in the game when the first item is moved to the temporary item accommodation space.

In one embodiment of the present disclosure, the smart contract determines whether or not the transaction condition of the first item is satisfied in response to a purchase request for the first item from a second user who wishes to purchase the first item, and When the transaction condition of the first item is satisfied, a second sub-contract for changing the ownership of the first item from the first user to the second user may be included. When such a second sub-contract is executed, the owner of the first item on the blockchain network 400 may be changed from the first user to the second user and recorded.

In one embodiment of the present disclosure, the smart contract, when changing the ownership of the first item from the first user to a second user who wants to purchase the first item, a second externally owned account associated with the second user ( Or a transaction or message for transferring at least part of the transaction cost of the first item from a wallet associated with the second user) to a first externally owned account associated with the first user (or a wallet associated with the first user) on the blockchain network. It may include a third sub-contract to generate.

Additionally, when the ownership of the first item is changed, the third sub-contract may transmit settlement information on the transaction cost to the game server 200 or the item exchange server 300. In this case, the actual transaction cost is deposited and withdrawn to the game server 200 or the item exchange server 300 based on the transmitted information, and the game server 200 or the item exchange server 300 settles the amount and is settled to the user. You may decide to pay. In this embodiment, the user does not need to have components such as a wallet on a separate blockchain network 400, and using a wallet of the game server 200 or the item exchange server 300, the game server Deposit/withdrawal is made to 200 or the item exchange server 300.

In one embodiment of the present disclosure, the smart contract transfers the first item when the first user cancels the sale of the first item or when ownership of the first item is successfully transferred to the second user. It may include a fourth sub-contract that allows the first item to be returned to a usable state in the game by moving it from the temporary item accommodation space to another location. For example, when the fourth sub-contract is called as the first user generates a transaction to cancel the sale of the first item, the first item is a temporary item accommodation space in the blockchain network 400. A transaction or message for moving from the address of the first user to the address of the first user can be generated and issued to the blockchain network 400.

According to an embodiment of the present disclosure, when ownership of a first item is transferred to a second user, the smart contract transfers at least a portion of the sales amount of the first item to a predetermined externally owned account for receiving donations. It may include a fifth sub-contract that generates a transaction for the blockchain network. According to an embodiment of the present disclosure, when a first user issues a request to use at least part of the item transaction amount as a donation, or according to the policy of the game server 200 (item exchange server 300) When at least part of the transaction amount is to be used as a donation, information on the amount (or ratio) to be paid as the donation and an account or address on the blockchain network 400 to receive the donation may be recorded in the smart contract. Accordingly, the fifth sub-contract can be executed according to the donation-related information recorded in the smart contract.

In a further embodiment, the fifth sub-contract covers at least a portion of the costs that may be involved in operating the blockchain network 400, such as fees incurred for generating blocks and/or rewards paid to mining nodes. You may decide to use it as a donation. Accordingly, at least a portion of the commission cost incurred to generate the block may be automatically paid to a predetermined donation receipt account or address as the fifth sub-contract is executed, and the fifth sub-contract is a transaction or message for such payment. Can be created.

When the donation is delivered to a predetermined externally owned account for receiving the donation, the balance information of the externally owned account that received the donation may be stored in the blockchain network 400. For example, balance information may be recorded in an externally owned account that received the donation.

As another example, the balance information may be stored in a DB for managing UTXO on the blockchain network 400 rather than an externally owned account based on the UTXO method. In this case, the balance information can be confirmed as the total sum of UTXO through a search to the UTXO DB.

In a further embodiment, the smart contract stores advertisement information (e.g., text information, image information, and video information related to a game or item) generated by the user terminal 100 or the game server 200 or the item exchange server 300. It can also be included. When a transaction with the user terminal 100 that has received such advertisement information is made, a content indicating that a reward such as a discount on the cost associated with the item transaction is provided to the corresponding user terminal 100 may be recorded in the smart contract.

As shown in FIG. 13, the smart contract 1300 may be converted into a byte code form by the compiler 1301, and a transaction converted into a byte code form is included in the block 1303, and the blockchain network 400 Can be propagated. A smart contract converted into byte code may be executed by a computing device in the blockchain network 400 (eg, by a virtual machine of the computing device). In addition, the compiler 1301 in the present disclosure may include any type of program for converting a code written in a specific programming language into another programming language. The compiler may also be included in at least one of the computing device constituting the blockchain network 400, the game server 200, the item exchange server 300, and the user terminal 100.

According to an embodiment of the present disclosure, since the game item is traded in a combination of on-chain and off-chain, it is possible to increase the user's experience through rapid transaction processing and UI display, as well as reliability. High and integrity guaranteed item transactions can be achieved.

Additionally, according to an embodiment of the present disclosure, it is possible to support transparent game item transaction using a block chain technology, for example, on a temporary item storage space in a game server 200 such as a safe and a block chain network 400 Using the temporary item accommodation space of, a safer game item transaction may be supported. In addition, according to an embodiment of the present disclosure, expansion of the blockchain through a combination of on-chain and off-chain, and a combination of a game server 200, an item exchange server 300, and a blockchain network 400 Sex problems can be solved.

In addition, according to an embodiment of the present disclosure, as only item transaction details are recorded and managed on the smart contract and the blockchain network 400, the rate of consensus on the blockchain increases, thereby improving the user's game service experience. I can.

According to an embodiment of the present disclosure, stable item transactions may be allowed for a plurality of games applying the same blockchain, and the value of in-app items purchased through cash disappears when the game is stopped or the service is terminated. 'S complaint can also be resolved.

Additionally, according to an embodiment of the present disclosure, item transaction may be activated through transparent item transaction using a block chain, and this may generate a fee for both game developers and exchanges.

In addition, according to an embodiment of the present disclosure, a new form of providing a service notifying the result of execution and formation of a smart contract related to the blockchain by receiving the authority to provide services on behalf of game publishers or users. Business models can also arise. Through this, since a confirmation request can be made by creating a smart contract or a list thereof and immediately transmitting the transaction status to the game service or the user's wallet, the convenience of the user's item transaction can be maximized.

[Description of Figure 14]

14 exemplarily shows a connection structure of blocks stored in the blockchain network 400 according to an embodiment of the present disclosure.

As shown in FIG. 14, blocks 1400a, 1400b, and 1400c, which are storage units in the blockchain network 400, may be connected to each other in a chain form to form a blockchain.

Blocks 1400a, 1400b, and 1400c may be composed of a block header and a transaction. The block header may include, for example, a hash value of a previous block header, a nonce value, and a hash value of a transaction group. The nonce value is a value that a node in the blockchain network 400 changes to generate a block, and may be used as an input value of a specific hash function along with other values of the block header. When a specific nonce value is used, if the hash value of the block header is smaller than the predetermined difficulty value (which can be stored in the block header), the hash value for the corresponding block header may be determined. The hash value of the transaction group may mean the root hash value of data included in the transaction.

As shown in Fig. 14, since the block hash value of block 302 (1400a) is used as an input value to obtain the block hash value of the block header of block 302 (1400b), block 302 (1400b) and block 301 (1400a) ) Can be connected to each other. In addition, in obtaining the block hash value, since the hash value of the transaction group, which is a hash value representing transactions, is used as an input value, when any forgery or alteration of a transaction occurs, the hash value of the transaction group is changed. In this way, adjacent blocks can be connected to each other, and transaction information within the block can be stored with integrity.

The transaction of the blocks 1400a, 1400b and 1400c is the transaction(s) included in the block among issued transactions, and when the transaction is included in the block, the operation related to the transaction will be performed in the blockchain network 400. I can.

Here, A, B, C, D, E, and F may correspond to addresses in the blockchain network 400 such as externally owned account or wallet address. In addition, Contracts 1 and 2 may mean smart contracts stored in the contract account.

As shown in Figure 14, the transaction in block 301 (1400a) is a transaction (Tx 1) for transferring 20 Coins from A to B, and a transaction for creating or calling smart contract 1 from C (Tx 2). It may include.

In addition, the transaction at block 302 (1400b) may include a transaction (Tx 1) to transfer 5 Coins from B to A, and a transaction to create or call a smart contract 2 from D (Tx 2).

In addition, the transaction in block 303 (1400c) may include a transaction (Tx 1) for transferring 10 Coins from F to E and a transaction for creating or calling smart contract 1 from G (Tx 3).

As an additional embodiment, although not shown in FIG. 14, the block headers of the blocks 1400a, 1400b, and 1400c are: a hash value (ParentHash) of a parent block (previous block), an uncle block of the current block (block difficulty is relatively The hash value (UncleHash) of blocks that were not adopted as blocks), the account address (Coinbase) to receive the transaction fee after mining, the root node hash value (Root) of the Merkle Patricia tree where the account status information is collected, Merkletree's root node hash value (TxHash) for all transactions, Merkletree's root node hash value (ReceiptHash) of all transactions in the block, and 32-byte bloom filter information used to use log information (Bloom) , The total of the block difficulty (Difficulty) calculated by the difficulty of the previous block and the timestamp, the current block number (Number), the maximum payable gas per block (the concept of the cost (token) used to process the transaction/smart contract) ( GasLimit), the total number of gases used in transactions within the block (GasUsed), the initial generation time of the block (Time), other information of the block (Extra), and/or to ensure the number of calculations sufficient to calculate the hash value from the proof of work. It can also include values to be used (MixDigest, Nonce).

[Description of Figure 15]

15 shows a general schematic diagram of an exemplary computing environment in which embodiments of the present disclosure may be implemented.

The computer 1102 shown in FIG. 15 may correspond to at least one of a user terminal 100, a game server 200, an item exchange server 300, and a computing device constituting the blockchain network 400.

While the present disclosure has generally been described above with respect to computer-executable instructions that may be executed on one or more computers, those skilled in the art will appreciate that the present disclosure may be implemented in combination with other program modules and/or as a combination of hardware and software. I will know.

In general, modules herein include routines, procedures, programs, components, data structures, etc. that perform particular tasks or implement particular abstract data types. Further, to those skilled in the art, the method of the present disclosure is not limited to single-processor or multiprocessor computer systems, minicomputers, mainframe computers, as well as personal computers, handheld computing devices, microprocessor-based or programmable household appliances, and the like (each of which It will be appreciated that it may be implemented with other computer system configurations, including one or more associated devices).

The described embodiments of the present disclosure may also be practiced in a distributed computing environment where certain tasks are performed by remote processing devices that are connected through a communication network. In a distributed computing environment, program modules may be located in both local and remote memory storage devices.

Computers typically include a variety of computer-readable media. A computer-accessible medium includes volatile and non-volatile media, transitory and non-transitory media, and removable and non-removable media. By way of example, and not limitation, computer-readable media may include computer-readable storage media and computer-readable transmission media.

Computer-readable storage media include volatile and nonvolatile media, transitory and non-transitory media, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Includes the medium. Computer-readable storage media include RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital video disk (DVD) or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage, or other magnetic storage. Devices, or any other medium that can be accessed by a computer and used to store desired information.

Computer-readable transmission media typically implement computer-readable instructions, data structures, program modules or other data on a modulated data signal such as a carrier wave or other transport mechanism. Includes all information delivery media. The term modulated data signal refers to a signal in which one or more of the characteristics of the signal is set or changed to encode information in the signal. By way of example, and not limitation, computer-readable transmission media include wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared, and other wireless media. Combinations of any of the above-described media are also intended to be included within the scope of computer-readable transmission media.

An exemplary environment 1100 is shown that implements various aspects of the present disclosure including a computer 1102, which includes a processing device 1104, a system memory 1106, and a system bus 1108. do. System bus 1108 couples system components, including but not limited to, system memory 1106 to processing device 1104. The processing unit 1104 may be any of a variety of commercially available processors. Dual processors and other multiprocessor architectures may also be used as processing unit 1104.

The system bus 1108 may be any of several types of bus structures that may be additionally interconnected to a memory bus, a peripheral bus, and a local bus using any of a variety of commercial bus architectures. System memory 1106 includes read-only memory (ROM) 1110 and random access memory (RAM) 1112. The basic input/output system (BIOS) is stored in non-volatile memory 1110 such as ROM, EPROM, EEPROM, etc. This BIOS is a basic input/output system that helps transfer information between components in the computer 1102, such as during startup. Includes routines. RAM 1112 may also include high-speed RAM, such as static RAM, for caching data.

Computer 1102 also includes internal hard disk drive (HDD) 1114 (e.g., EIDE, SATA)-This internal hard disk drive 1114 can also be configured for external use within a suitable chassis (not shown). Yes--, magnetic floppy disk drive (FDD) 1116 (for example, to read from or write to removable diskette 1118), and optical disk drive 1120 (e.g., CD-ROM For reading the disk 1122 or reading from or writing to other high-capacity optical media such as DVD). The hard disk drive 1114, magnetic disk drive 1116, and optical disk drive 1120 are each connected to the system bus 1108 by a hard disk drive interface 1124, a magnetic disk drive interface 1126, and an optical drive interface 1128. ) Can be connected. The interface 1124 for implementing an external drive includes, for example, at least one or both of USB (Universal Serial Bus) and IEEE 1394 interface technologies.

These drives and their associated computer readable media provide non-volatile storage of data, data structures, computer executable instructions, and the like. In the case of computer 1102, drives and media correspond to storing any data in a suitable digital format. Although the description of the computer-readable storage medium above refers to a removable optical medium such as a HDD, a removable magnetic disk, and a CD or DVD, those skilled in the art may include a zip drive, a magnetic cassette, a flash memory card, a cartridge, It will be appreciated that other types of computer-readable storage media, such as etc., may also be used in the exemplary operating environment and that any such media may contain computer-executable instructions for performing the methods of the present disclosure. .

A number of program modules, including the operating system 1130, one or more application programs 1132, other program modules 1134, and program data 1136, may be stored in the drive and RAM 1112. All or part of the operating system, applications, modules, and/or data may also be cached in RAM 1112. It will be appreciated that the present disclosure may be implemented on a number of commercially available operating systems or combinations of operating systems.

A user may input commands and information to the computer 1102 through one or more wired/wireless input devices, for example, a pointing device such as a keyboard 1138 and a mouse 1140. Other input devices (not shown) may include a microphone, IR remote control, joystick, game pad, stylus pen, touch screen, and the like. These and other input devices are often connected to the processing unit 1104 through the input device interface 1142, which is connected to the system bus 1108, but the parallel port, IEEE 1394 serial port, game port, USB port, IR interface, It can be connected by other interfaces such as etc.

A monitor 1144 or other type of display device is also connected to the system bus 1108 through an interface such as a video adapter 1146. In addition to the monitor 1144, the computer generally includes other peripheral output devices (not shown) such as speakers, printers, etc.

Computer 1102 may operate in a networked environment using logical connections to one or more remote computers, such as remote computer(s) 1148 via wired and/or wireless communication. The remote computer(s) 1148 may be a workstation, server computer, router, personal computer, portable computer, microprocessor-based entertainment device, peer device, or other common network node, and is generally referred to as a computer 1102. Although including many or all of the described components, only memory storage device 1150 is shown for simplicity. The logical connections shown include wired/wireless connections to a local area network (LAN) 1152 and/or to a larger network, eg, a wide area network (WAN) 1154. Such LAN and WAN networking environments are common in offices and companies, and facilitate an enterprise-wide computer network such as an intranet, all of which can be connected to a worldwide computer network, for example the Internet.

When used in a LAN networking environment, the computer 1102 is connected to the local network 1152 via a wired and/or wireless communication network interface or adapter 1156. Adapter 1156 may facilitate wired or wireless communication to LAN 1152, which also includes a wireless access point installed therein to communicate with wireless adapter 1156. When used in a WAN networking environment, the computer 1102 may include a modem 1158, connected to a communication server on the WAN 1154, or through the Internet, etc. to establish communication through the WAN 1154 Have means. The modem 1158, which may be an internal or external and a wired or wireless device, is connected to the system bus 1108 through a serial port interface 1142. In a networked environment, program modules described for the computer 1102 or portions thereof may be stored in the remote memory/storage device 1150. It will be appreciated that the network connections shown are exemplary and other means of establishing communication links between computers may be used.

Computer 1102 is associated with any wireless device or entity deployed and operated in wireless communication, e.g., a printer, scanner, desktop and/or portable computer, portable data assistant (PDA), communication satellite, wireless detectable tag. It operates to communicate with any device or place and phone. This includes at least Wi-Fi and Bluetooth wireless technologies. Thus, the communication may be a predefined structure as in a conventional network or may simply be ad hoc communication between at least two devices.

Wi-Fi (Wireless Fidelity) allows you to connect to the Internet, etc. without wires. Wi-Fi is a wireless technology such as a cell phone that allows such devices, for example computers, to transmit and receive data indoors and outdoors, ie anywhere within the coverage area of a base station. Wi-Fi networks use a wireless technology called IEEE 802.11 (a,b,g, etc.) to provide a secure, reliable and high-speed wireless connection. Wi-Fi can be used to connect computers to each other, to the Internet, and to a wired network (using IEEE 802.3 or Ethernet). Wi-Fi networks can operate in unlicensed 2.4 and 5 GHz wireless bands, for example at 11 Mbps (802.11a) or 54 Mbps (802.11b) data rates, or in products that include both bands (dual band). have.

A person of ordinary skill in the art of the present disclosure includes various exemplary logical blocks, modules, processors, means, circuits and algorithm steps described in connection with the embodiments disclosed herein, electronic hardware, (convenience). For the sake of clarity, it will be appreciated that it may be implemented by various forms of program or design code or a combination of both (referred to herein as "software"). To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the particular application and design constraints imposed on the overall system. A person of ordinary skill in the art of the present disclosure may implement the described functions in various ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The various embodiments presented herein may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term “article of manufacture” includes a computer program, carrier, or media accessible from any computer-readable device. For example, computer-readable storage media include magnetic storage devices (e.g., hard disks, floppy disks, magnetic strips, etc.), optical disks (e.g., CD, DVD, etc.), smart cards, and flash Memory devices (eg, EEPROMs, cards, sticks, key drives, etc.), but are not limited thereto. The term “machine-readable medium” includes, but is not limited to, wireless channels and various other media capable of storing, holding, and/or transmitting instruction(s) and/or data.

It is to be understood that the specific order or hierarchy of steps in the presented processes is an example of exemplary approaches. Based on the design priorities, it is to be understood that within the scope of the present disclosure a specific order or hierarchy of steps in processes may be rearranged. The appended method claims provide elements of the various steps in a sample order, but are not meant to be limited to the specific order or hierarchy presented.

The description of the presented embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be apparent to those of ordinary skill in the art, and general principles defined herein may be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the embodiments presented herein, but is to be interpreted in the widest scope consistent with the principles and novel features presented herein.

Claims (24)

A computer program stored in a computer-readable storage medium, wherein the computer program, when executed by one or more processors, performs a method for item trading, the method comprising:
Receiving a transaction request for a first item playable in the game from the first user;
Determining to move the first item to a temporary item accommodation space having an address in the blockchain network;
In response to determining to move the first item to the temporary item accommodation space, creating a smart contract operable on the blockchain network for executing the transaction of the first item on the blockchain network. step; And
Allowing the first item moved to the temporary item accommodation space to be a target of item transaction;
Including,
The smart contract is:
A first sub-contract for moving the first item to the temporary item accommodation space for item transaction while ensuring that the first user has ownership of the first item until the transaction condition of the first item is satisfied;
Including,
The temporary item accommodation space,
It is an account with a specific address on the blockchain network,
Performing a function of accommodating the item subject to the transaction on the blockchain network,
A computer program stored on a computer-readable storage medium. delete delete The method of claim 1,
When the first item is moved to the temporary item accommodation space, the first item is changed to a state that is not usable in the game,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The smart contract is:
In response to a purchase request for the first item from a second user who wants to purchase the first item, it is determined whether the transaction condition of the first item is satisfied, and when the transaction condition of the first item is satisfied And a second sub-contract for changing ownership of the first item from the first user to the second user;
Containing,
A computer program stored on a computer-readable storage medium. The method of claim 5,
The smart contract is created based on the transaction condition of the first item,
The transaction condition of the first item is determined based at least in part on transaction type information included in a transaction request for the first item from the first user, and
The transaction type information includes at least one of an automatic purchase reservation transaction, an upper limit auction transaction, a price designation general transaction, a rental transaction, an advertisement generation transaction, and a donation generation transaction,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The smart contract is:
When the ownership of the first item is changed from the first user to a second user who wants to purchase the first item, the first item from a second externally owned account (EOA) associated with the second user A third sub-contract for generating a transaction on the blockchain network for delivering at least a portion of the transaction cost of the first item to a first externally owned account associated with a user;
Containing,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The smart contract is:
When the first user cancels the sale of the first item or transfers ownership of the first item to a second user, by moving the first item from the temporary item accommodation space to another location, A fourth sub-contract allowing the first item to return to a usable state in the game;
Containing,
A computer program stored on a computer-readable storage medium. The method of claim 8,
The fourth sub-contract is:
When a transaction including an indication that the first user cancels the sale of the first item is received, the first item is transferred from the block chain network address of the temporary item accommodation space to the block chain associated with the first user. To generate a transaction to move to a network address,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The smart contract is:
When ownership of the first item is transferred to a second user, a fifth in which a transaction for transferring at least a portion of the sales amount of the first item to a predetermined externally owned account for receiving donations is generated on the blockchain network Sub-contract;
Including,
When the delivery is completed to the predetermined externally owned account for receiving the donation, payment information of the donation is output based at least in part on the balance information of the externally owned account that received the donation,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The smart contract is included in the block and distributed to the blockchain network,
When the smart contract is distributed to the blockchain network, a contract account corresponding to the smart contract is created, and
As the smart contract is stored in the contract account on the blockchain network, a smart contract for performing a transaction for the first item on the blockchain network is activated to be operable,
A computer program stored on a computer-readable storage medium. The method of claim 11,
The first item stored in the contract account in response to a transaction including a transaction request for the first item generated from an externally owned account related to a second user who wishes to purchase the first item or related to a game server The smart contract is called to perform the transaction of
A computer program stored on a computer-readable storage medium. The method of claim 11,
The contract account in which the smart contract is stored is:
The number of smart contracts created for item transaction; And
A hash value for the byte code of the smart contract for the item transaction;
Including,
The address of the contract account is generated based at least in part on a private key of at least one of a first user, a game server, and an item exchange server,
A computer program stored on a computer-readable storage medium. The method of claim 1,
Including the generated smart contract in a block and distributing it to a blockchain network;
It further includes,
The block distributed to the blockchain network includes: smart contract for the item transaction and item transaction history information, and
The smart contract is distributed to the blockchain network based on a consensus algorithm by a plurality of nodes, and the plurality of nodes are at least two of one or more user terminals, one or more game servers, and one or more item exchange servers. Containing,
A computer program stored on a computer-readable storage medium. The method of claim 1,
In response to determining to move the first item to the temporary item accommodation space for item transaction, the temporary item using a private key associated with at least one of the first user, an item exchange server, and a game server Generating a first transaction for moving the first item to a block chain address associated with an item accommodation space;
Further comprising,
A computer program stored on a computer-readable storage medium. The method of claim 15,
The first transaction is:
A transaction input value including signature information generated from the private key; And
A transaction output value including identification information on the first item and block chain address information associated with the temporary item accommodation space;
Containing,
A computer program stored on a computer-readable storage medium. The method of claim 15,
The method is:
Receiving a transaction request for the first item from a second user who wants to purchase the first item;
Generating a second transaction including a transaction request for the first item using a private key associated with at least one of the second user, an item exchange server, and a game server;
Calling a smart contract included in the first transaction by issuing the second transaction to the blockchain network; And
When a transaction for the first item between a first user and a second user is recorded in the blockchain network, the first user from the temporary item storage space managed by the game server on the first item on the game related to the first item Determining what to move from the inventory of;
Further comprising,
A computer program stored on a computer-readable storage medium. The method of claim 15,
The method is:
Receiving a transaction request for the first item from a second user who wants to purchase the first item;
Generating a second transaction including a transaction request for the first item using a private key associated with at least one of the second user, an item exchange server, and a game server; And
Calling a smart contract included in the first transaction by issuing the second transaction to the blockchain network;
It further includes,
As the smart contract is called, a transaction for transferring the cost associated with the transaction of the first item from the externally owned account of the second user to the externally owned account of the first user, and the transaction on the blockchain network A transaction is generated to move the first item from the temporary item accommodation space to an externally owned account associated with the second user or the game server,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The step of allowing the first item moved to the temporary item accommodation space to be a target of item transaction is:
Allowing the transaction to be included in a block and distributed to a blockchain network by generating a transaction for moving the first item to the temporary item accommodation space; And
Allowing users to confirm that the first item is a transaction target in at least one of a game server and an item exchange server related to the first item;
Containing,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The method is performed by at least one of an off-chain based game server and an off-chain based item exchange server,
A computer program stored on a computer-readable storage medium. The method of claim 1,
The step of allowing the first item moved to the temporary item accommodation space to be a target of item transaction,
In response to determining to move the first item to the temporary item accommodation space having an address in the blockchain network, the game server manages the first item on the game associated with the first item from the inventory of the first user Allowing in-game users to confirm that the first item is a target of item transaction by moving to a temporary item storage space;
Containing,
A computer program stored on a computer-readable storage medium. As a game server for performing item transactions,
A transceiver for receiving a transaction request for a first item playable in the game from a first user; And
It is determined to move the first item to an item storage space in the game server, to move the first item to a temporary item accommodation space having an address in the blockchain network, and move to the temporary item accommodation space A processor that allows the first item to be subject to item transaction;
Including,
The processor,
To execute the transaction of the first item on the blockchain network, a smart contract operable on the blockchain network is created,
The smart contract is:
A first sub-contract for moving the first item to the temporary item accommodation space for item transaction while ensuring that the first user has ownership of the first item until the transaction condition of the first item is satisfied;
Including,
The temporary item accommodation space,
It is an account with a specific address on the blockchain network,
Performing a function of accommodating the item subject to the transaction on the blockchain network,
Game server. As an item exchange server,
Receiving a transaction request for a first item playable in the game from the first user, and transmitting a signal to the game server for allowing the first item to be moved to the item storage space in the game server A transceiver; And
In order to move the first item to a temporary item accommodation space having an address in the blockchain network, a transaction to be distributed to the blockchain network is generated, and the first item moved to the temporary item accommodation space is a target of item transaction. A processor that determines to transmit information related to the transaction to a game server in order to allow this to be performed;
Including,
The processor,
To execute the transaction of the first item on the blockchain network, a smart contract operable on the blockchain network is created,
The smart contract is:
A first sub-contract for moving the first item to the temporary item accommodation space for item transaction while ensuring that the first user has ownership of the first item until the transaction condition of the first item is satisfied;
Including,
The temporary item accommodation space,
It is an account with a specific address on the blockchain network,
Performing a function of accommodating the item subject to the transaction on the blockchain network,
Item exchange server. As a computing device constituting a blockchain network,
Processor; And
A memory storing a computer program executable by the processor;
Including,
The processor is:
Receiving a first transaction including a smart contract corresponding to a transaction request for a first item playable in the game from the first user;
Including the first transaction in a first block generated according to a consensus algorithm;
Based on the smart contract included in the first transaction, the first item is moved to a temporary item accommodation space having an address in the blockchain network, thereby allowing the first item to be a target of item transaction, ,
The smart contract is:
A first sub-contract for moving the first item to the temporary item accommodation space for item transaction while ensuring that the first user has ownership of the first item until the transaction condition of the first item is satisfied;
Including,
The temporary item accommodation space,
It is an account with a specific address on the blockchain network,
Performing a function of accommodating the item subject to the transaction on the blockchain network,
A computing device that makes up a blockchain network.

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