KR20200091647A - Technique for item transaction - Google Patents

Abstract

Disclosed is a computer program stored in a computer readable storage medium. The computer program performs a method for trading items when executed by one or more processors, and the method can comprise the following steps of: receiving a trade 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 a blockchain network; and allowing the first item moved to the temporary item accommodation space to be an item trade target. Therefore, the transparency and stability of item trade can be secured.

Description

Item trading technique {TECHNIQUE FOR ITEM TRANSACTION}

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

With the development of the Internet, transactions are being made for various types of objects on various platforms through online. Objects that exist in the virtual world, such as games, etc., that are not in the real world can also be valued, so objects in these virtual worlds can also be traded. In the past, items used in the game were recognized as being present only in the game and its value only 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 situations like the real world, and accordingly, the value of items and/or currency commonly used in the game It is also recognized for its value as a good in the real world. Particularly, thanks to the development of online/mobile technologies 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 now "goods" or It is considered "property gain". Accordingly, the demand for the transaction of various types of items that can be purchased or created in the game is also increasing.

There are various ways to trade game-related items.

The most representative method is a transaction method through an external game item agency. When the user wants to sell a specific item to another person, after accessing a separate game item agency, the game item agency site posts the identification information of the item to be sold and the display of the selling price. Then, another user who confirms the indication posted on the game item agency site, may indicate a purchase intention for the item to be sold, and deposit the cash corresponding to the sale price to the game item agency. Then, the seller and the buyer make an appointment with each other, then access the game together, and then trade the item for sale at a specific place in the game. After the in-game item transaction is completed, the seller and/or the buyer access the game item agency site and post an indication that the item transaction has been completed, whereby the game item agency can pay the seller's cash to the seller. For such a transaction through a game item brokerage, it is difficult to provide clear physical evidence that the item was actually traded in the game, so a risk of instability may exist. In addition, in the case of using such a game item brokerage station, the user's posting process, the process of transacting the game item after the users set the time to access the game server, the process of entrusting the transaction, and the process of displaying the transaction completion, etc. Since there are a number of procedures, the transaction is not only inconvenient, but the risk of stability may exist by the fact that multiple procedures must be performed. In addition, since these game item brokerages set a high fee for transaction of game items to cover brokerage operation costs (eg, server operation costs and labor costs) as separate entities, the cost burden of item trading is also a problem. Can be

As another way to trade items related to games, there is an in-game item exchange that can allow trading items within the game. The in-game item exchange is a concept in which an exchange or brokerage system is included in the game. That is, since the item transaction can be performed while playing the game and the item transaction can be completed on the game server itself without the process of directly meeting between users, the in-game item exchange can increase the convenience for the user's item transaction. However, in the case of an in-game item exchange, since it is included in the game, it is bound to be limited to the item transaction related to the game itself. In addition, since the in-game item exchange is made under the management of a game company, there is a limitation in the type of items sold, and there is a possibility that stable item trading is not possible due to the risk from external hacking. Furthermore, these in-game item exchanges also have weaknesses in terms of ensuring the transparency of transactions.

Accordingly, there is a demand for an item trading method that can secure transparency of item trading and allow stable item trading.

Korean Registered Patent KR10-1673073

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

In accordance with one embodiment of the present disclosure, a computer program stored in a computer readable storage medium is disclosed. 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 a game from a first user; Determining to move the first item to a temporary item accommodating space having an address in the blockchain network; And allowing the first item moved to the temporary item accommodating space to be a target of an item transaction.

According to one embodiment of the present disclosure, a game server for performing an item transaction is disclosed. The game server includes: a transceiver configured to receive a transaction request for a first item playable in a game from a first user; And moving the first item to an item storage space in the game server, determining to move the first item to a temporary item storage space having an address in the blockchain network, and to the temporary item storage space. And a processor that allows the moved first item to be subject to an item transaction.

In accordance with one 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 for allowing the first item to be moved to an item storage space in the game server Transmitting and receiving unit for transmitting the game server; And creating a transaction to be distributed to the blockchain network in order to move the first item to a temporary item accommodating space having an address in the blockchain network, and the first item moved to the temporary item accommodating space. It may include a processor that determines to transmit the information related to the transaction to the game server to allow the target.

According to one embodiment of the present disclosure, a computing device constituting a blockchain network is disclosed. The computing device includes: a processor; And a memory storing computer programs executable by the processor. Here, the processor includes: receiving a first transaction including a smart contract corresponding to a transaction request for a first item playable in a game from a first user; Include 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 may be configured to allow the first item to be subject to an item transaction by moving it to a temporary item receiving space having an address in the blockchain network. Can.

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

Various aspects are now described with reference to the drawings, in which like reference numerals are used collectively to refer to similar components. In the following examples, 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 in order to facilitate describing one or more aspects.
1 shows an exemplary system for performing item trading according to one 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 trading method performed in an item exchange server according to an embodiment of the present disclosure.
5 exemplarily illustrates 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 flowchart of an item trading scheme according to one embodiment of the present disclosure.
7 shows an exemplary flow chart of an item trading scheme according to one embodiment of the present disclosure.
8 shows an exemplary flowchart of an item trading scheme according to one embodiment of the present disclosure.
9 shows an exemplary flow chart of an item trading scheme according to one embodiment of the present disclosure.
10 exemplarily illustrates 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 an item transaction in a user terminal according to an embodiment of the present disclosure.
12 illustrates an exemplary UI configuration for performing an item transaction in a user terminal according to an embodiment of the present disclosure.
13 exemplarily illustrates an aspect 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 example computing environment in which embodiments of the present disclosure can be implemented.

Various embodiments and/or aspects are now disclosed with reference to the drawings. In the following description, for purposes of explanation, a number of specific details are disclosed to assist in the overall understanding of one or more aspects. However, it will also be appreciated by those skilled in the art that this aspect(s) can be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the 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.

Further, 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. Various systems may include additional computing devices, terminals, servers, devices, components, and/or modules, etc. and/or devices, terminals, servers discussed in connection with the figures It should also be understood and appreciated that it may not include all of devices, components, modules, and the like.

The terms "computer program", "component", and "module" used in this specification may be used interchangeably. For example, a component can be, but is not limited to, a process executed on a processor, a processor, an object, a thread of execution, a program, and/or a computer. For example, both the application and the computing device running on the computing device can be components. One or more components can reside within a processor and/or thread of execution. One component can be localized in one computer. One 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. The components are, for example, signals having one or more data packets (e.g., data and/or signals from one component interacting with other components in a local system, distributed system, etc.) through other systems and networks such as the Internet. (Transmitted data) may be communicated through local and/or remote processes.

As used herein, "an embodiment", "yes", "a good", "an example", etc., may not be construed as any aspect or design described being better or more advantageous than another aspect or designs. . The terms'component','module','system', and'interface' used in the following 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 unclear in context, "X uses A or B" is intended to mean one of the natural inclusive substitutions. That is, X uses A; X uses B; Or, if X uses both A and B, "X uses A or B" can be applied in either of these cases. It should also be understood that the term "and/or" as used herein refers to and includes all possible combinations of one or more of the listed related items.

Also, the terms “comprises” and/or “comprising” mean that the feature and/or component 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 contextually unclear as indicating a singular form, the singular in the specification and claims should generally be construed to mean "one or more."

Computer-readable media as used herein may include any kind of media in which programs and data are stored so that they can be read by a computer system. Computer-readable media in the present disclosure may include computer-readable storage media and computer-readable transmission media. According to one 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. Disks, optical data storage devices, and the like. In addition, the computer-readable transmission medium may include any transmission-type medium that is embodied 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 fashion.

It should be noted that, prior to explaining the specific contents for carrying out the present invention, a configuration not directly related to the technical subject matter of the present invention has been omitted without detracting from the technical subject matter of the present invention. In addition, the terms or words used in the specification and claims are based on the principle that the inventor can define the concept of appropriate terms in order to explain his or her invention in the best way. It should be interpreted as a concept.

[Description of Figure 1]

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

As shown in Figure 1, the system for performing the item transaction, the user terminal (100a, 100b and 100c: 100), the game server 200, the item exchange server 300, the blockchain network 400 and communication Network 500. The components shown in FIG. 1 are exemplary, and additional components may be present or some of the components shown 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 the 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. Also, the user terminal 100 may include any server implemented by at least one of an agent, an application programming interface (API), and a plug-in. Also, 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 media).

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

The memory in the present disclosure may store a program for the operation of the processor, and may temporarily or permanently store input/output data. The memory includes a flash memory type, hard disk type, multimedia card micro type, card type memory (for example, SD or XD memory, etc.), and RAM (Random Access). Memory, RAM), Static Random Access Memory (SRAM), Read-Only Memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Programmable Read-Only Memory (PROM), magnetic memory, magnetic disk, optical disk It may contain at least one type of storage medium. This memory can be operated under control of the processor. Also, in the present disclosure, a memory and a 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 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 can be used to query item information registered on the blockchain network 400. Transactions in the present disclosure can be used to record/insert data on the blockchain network 400 or to perform updates (modify/change/delete/add) 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 compile the application source to generate a client application. 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 generate a smart contract that can be operated on the blockchain network 400 using any 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 may access the game server 200 to perform a game provided by the game server, and may use any type of game-related items acquired or purchased in the course of performing the game in the game. . The game in the present specification may include any type of game, such as mobile game, web game, VR game, P2P game, online/offline game.

In addition, the user terminal 100 may generate a transaction request message for the game-related item and deliver 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 an 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 operate as a node constituting the blockchain network 400. In this example, the user terminal 100 may implement at least one function of a wallet function, a miner function, and a storage function of a full blockchain data. For example, when the user terminal 100 includes only the wallet function, it may operate as a node (for example, an SPV (Simplified Payment Verification) node) that performs transaction and validation.

The user terminal 100 is provided with a display, and may receive an input of a user in providing a game play and/or an item transaction and provide an output in any form to the user.

Game server 200 and item exchange server 300 according to one embodiment of the present disclosure may be of any type of computer system, such as, for example, a microprocessor, mainframe computer, digital processor, portable device and device controller, or Computer devices. Although not illustrated 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 any type of item playable in the game.

In FIG. 1, although the game server 200 and the item exchange server 300 are separately expressed as separate entities, the item exchange server 300 is included in the game server 200 according to an embodiment of the present disclosure, and the game The play function and the item trading function may 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 game item trading 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 trading.

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 one embodiment of the present disclosure, the blockchain network 400 may mean a plurality of nodes operating based on 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 transactions 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 represented as a separate entity, but according to an embodiment of the present disclosure, the blockchain network 400 may include at least one of the game server 200 and/or the item exchange server 300. It may be implemented in the form included in one.

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

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

In one 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 defining the structure of data to be handled in the blockchain network 400, a data layer that manages the data, and a fee paid to miners in the mining process to verify the validity of blocks and to create blocks. Consensus layer in charge of processing, execution layer for processing and executing smart contracts, P2P network protocol, hash function, digital signature, common layer for implementing and managing common storage, and various applications are created, processed, and managed Application layer may be included.

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

Items to be traded in the present disclosure include any type of item that can be played in the game, and may include, for example, a non-fungible item and a fungible item. For Non-Fungible items, a transaction may be performed based on, for example, the ERC-721 standard code and/or the ERC-1155 standard code. In addition, for a 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 proposed in the present disclosure is Code Division Multi Access (CDMA), Time Division Multi Access (TDMA), Frequency Division Multi Access (FDMA), Orthogonal Frequency Division Multi Access (OFDMA), SC-FDMA Various wireless communication systems such as (Single Carrier-FDMA) and other systems can be used. The techniques described in this disclosure can be used in the networks mentioned above, as well as in any form of other communication networks.

The term “transient item accommodating space” in the present disclosure is referred to as an account having a specific address on the blockchain network 400 (eg, an externally owned account (EOA) and/or contract account (CA)), the blockchain network 400 ), it can perform the function of temporarily accepting the item to be traded. 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 term “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 the game, a common inventory, an inventory for trading items, an item exchange, and the like. When an item sale request is generated from the user, the game server 200 may move the corresponding item from the user's inventory to the temporary item storage space. Accordingly, users can know that the corresponding item in the game is the target of the transaction. 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 the codes and/or functions included in the smart contract are executed, any form of item transaction (eg, sale, purchase, rental of game items, etc.) according to embodiments of the present disclosure may be performed. .

The smart contract according to the embodiments of the present disclosure may include 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 executed by Also, the smart contract may be executed by a transaction generated by an externally owned account or other contract.

Coin in the present specification may mean any form of cryptocurrency that is operable on the blockchain network 400. Such coins may be convertible into cash by the item exchange server 300 or game server 200 according to the market price.

A smart contract for performing an item transaction according to embodiments of the present disclosure is configured to pay a specific execution cost when executing a transaction, for example, to prevent malicious code such as infinite repetition and to maintain the integrity of data related to the item transaction. It can be prescribed. Here, the execution cost may mean any form of coin that can be traded in the blockchain network 400 or another form of mediator (eg, gas) that can be linked with the coin. As a non-limiting example, the basic execution cost of a transaction can be set to 21,000 gas. For example, the execution cost may include a cost for processing an elliptic curve digital signature algorithm (ECDSA) for the transaction issuer's account address, a storage cost for transaction storage, and a network bandwidth cost. When such a smart contract is defined to pay a specific cost when executing, a malicious attack such as an infinite execution such as an intentional DDoS attack can be prevented.

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

In implementing an item transaction according to embodiments of the present disclosure, when a function of a smart contract is included in a transaction in a compiled code form and synchronized through a blockchain, the information included in the transaction is coded as an input of the function A smart contract can be implemented by executing the function represented by and storing the result in a separate state.

When the function content and the input of the function are shared by a smart contract shared in the blockchain network 400, data integrity can be ensured 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 trading are smart contracts that store the latest state of the smart contracts and a transaction storage database that changes the state of the smart contracts. It may also include a database. In this case, the smart contract for item trading in the present disclosure may be defined as an application (ie, item trading application) that can change the state on the blockchain network 400, and the state of the smart contract It can be defined as a variable used in the corresponding application (that is, the 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, the user terminal 100 It 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, it may operate separately from the database storing the transaction in order to achieve the distributed agreement of the database storing the state of the smart contract and the low dependency of the smart contract.

[Description of Fig. 2]

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

2, the game server 200 may include a processor 201, a storage unit 202, and a transceiver 203, and the item exchange server 300 may include a processor 301, a storage unit 302 and a transmitting and receiving unit 303. The components described above are exemplary and the scope of the present disclosure is not limited to the components described above. That is, additional components may be included or some of the aforementioned components may be omitted according to an implementation aspect of the embodiments of the present disclosure.

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

In accordance with an embodiment of the present disclosure, the game server 200 receives and receives a transaction request for a first item playable in a game from a first user who wants an item transaction (eg, sale or rental). 203. Also, the transceiver 203 may receive a transaction request from a second user who desires a transaction (eg, purchase or rental) of the first item after the first item is registered to be the target of the transaction. .

The transceiver 203 may include a wired/wireless Internet module for network access. Wireless Internet technology (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) may be used. As a wired Internet technology, digital subscriber line (XDSL), fibers to the home (FTTH), and power line communication (PLC) may be used. Also, the transceiver 203 may include a short range communication module. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), and ZigBee may be used as short-range communication technology.

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 any type of information generated or determined by the processor 201 and any type of information received by the transceiver 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 components of the game server 200 to allow item trading. For example, the processor 201 moves the first item to the item storage space in the game server 200, and moves the first item to the temporary item receiving space having the address in the blockchain network 400. Decision to be made, and allow the first item moved to the temporary item accommodating space to be subject to the 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 to the inventory of the second user in the game server 200.

The item exchange server 300 receives a transaction request for a first item playable in the game from the first user, and allows the first item to be moved to the item storage space in the game server 200 It may include a transmitting and receiving unit 303 for transmitting a signal for allowing to the game server 200. Also, the transceiver 303 may receive a transaction request for a first item from a second user who desires a transaction (eg, purchase or rental) for the first item.

The transceiver 303 may include a wired/wireless Internet module for network access. Wireless Internet technology (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed Downlink Packet Access) may be used. As a wired Internet technology, digital subscriber line (XDSL), fibers to the home (FTTH), and power line communication (PLC) may be used. Also, the transceiver 303 may include a short range communication module. Bluetooth, radio frequency identification (RFID), infrared data association (IrDA), ultra wideband (UWB), and ZigBee may be used as short-range communication technology.

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 any type of information generated or determined by the processor 301 and any type of information received by the transceiver 303 in the item exchange server 300. The storage unit 302 may include a memory and/or a permanent storage medium.

The processor 301 creates a transaction to be distributed to the blockchain network 400 to move the first item to a temporary item accommodating space having an address in the blockchain network, and the first item moved to the temporary item accommodating space. In order to allow the target of the item 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 the second user, the processor 301 generates a transaction corresponding to the transaction and distributes it to the blockchain network 400, thereby allowing the first item from the temporary item accommodating space to the second user's inventory. Can allow this to be moved.

Although not illustrated 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 computer programs 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 in the computing device may include the first transaction in the first block generated according to the consensus algorithm. In addition, the processor in the computing device moves the first item to a temporary item accommodating space having an address in the blockchain network 400 based on the smart contract included in the first transaction, so that the first item trades the item. It can be configured to allow the target.

According to one embodiment of the present disclosure, the computing device may receive a second transaction corresponding to a transaction (eg, purchase or rental) request for the first item from the second user. According to the second transaction, a 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, a transaction procedure for a first item may include a procedure for changing ownership of a first item from a first user to a second user, a procedure for transferring a transaction amount from a second user to a first user, and/or a temporary item And a procedure in which the first item is moved from the accommodation space to the address or account of the second user.

[Description of Fig. 3]

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

The steps shown in FIG. 3 are exemplary steps, and it will be apparent to those skilled in the art that some of the steps in FIG. 3 may be omitted or additional steps may be present 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 receive a transaction request for the first item directly 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 receives from the first user from the item exchange server 300 It may receive a signal that the request for the transaction for the first item of the.

In one embodiment of the present disclosure, the first item may mean a game item in a form that can be played and traded in the game. Further, 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 smart contracts and transactions based on transaction request information for the first item. In addition, in the former case, the game server 200 may deliver 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 delivered to the game server 200 (or 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 first user's in-game inventory to allow the first user to not play the game while maintaining ownership of the first item to the first user Can be moved to the item storage space. 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 about the item to be output in the game so that users can search for items 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 the transaction including the smart contract to the blockchain network 400 It can be issued (330).

In one embodiment, the game server 200 may generate a smart contract based on transaction condition information included in the transaction request for the 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 price auction transaction, a rental transaction, a general price designation transaction, an advertisement generation transaction, and a donation generation transaction. A user who wishes to trade an item may input an indication that he or she wishes to trade a game item on a user interface (UI) and enter a transaction condition for the game item, and in response, the game server 200 based on the user input information It is possible to automatically generate smart contracts that can be operated 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 generated. 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 generated for item trading, and a hash value for the byte code of the smart contract for item trading.

Further, 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 can be generated from the public key using SHA 256 and/or RACE Integrity Primitives Evaluation Message Digest (RIPEMD).

In one embodiment, a block distributed to the blockchain network 400 may include smart contracts for item trading and item transaction history information. According to one embodiment of the present disclosure, when only the smart contract and item transaction history information are included in the block distributed to the blockchain network 400, the block size of the blockchain can be minimized in performing the item transaction. , It is possible to reduce the generation time of the block and the propagation time of the block, and also reduce the computing resources for storing the block.

In addition, smart contracts are distributed to the blockchain network based on a consensus algorithm by a plurality of nodes, where the plurality of nodes, 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 a further embodiment, the game server 200, in order to perform item trading on the first item, a private key associated with at least one of the first user, the item exchange server 300 and the game server 200 Using, it is also possible to create a transaction for moving the first item to a blockchain address associated with the temporary item accommodating space. In this case, the transaction may include: 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 blockchain address information associated with the temporary item accommodating space. Can.

In addition, the temporary item accommodating space having an address on the blockchain network 400 may correspond to the temporary item storage space of the game server 200 (eg, a safe in the game, a common inventory, an item trading inventory, an item exchange). 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 secured. have.

In a further 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 operate in the form of receiving information that the information or transaction has been shared with the blockchain network 400.

In one embodiment, the game server 200 may receive a purchase request for the first item from the second user who confirms that the first item is a transaction target (340). For example, the game server 200 may receive a transaction request (eg, a purchase request) for the first item directly from the user terminal 100 of the second user. As another example, after the user terminal 100 of the second user delivers the purchase request for the first item to the item exchange server 300, the game server 200 receives the second user from the item exchange server 300. It may receive a signal that the purchase request for the first item of the has been made.

In one embodiment, a purchase request for a first item from a second user may be in the form of a message containing an indication to purchase the first item or of a transaction that may be operated on the blockchain network 400. It may 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 item exchange server 300). In this example, the user terminal 100 may include any form of API capable of creating an actionable transaction in the blockchain network 400.

In one 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 this transaction, a smart contract pre-stored in the blockchain network 400 can be called. As an example, after receiving a signal including an indication that a second user wants to purchase a first item from a second user, the game server 200 confirms whether the signal satisfies a purchasing condition suggested by the first user, If satisfied, a transaction to call a smart contract can be created. As another example, the game server 200 may deliver the 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 first user wants to purchase a first item from a second user into a transactional operation on the blockchain network 400.

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

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 history of the transaction of integrity items on the blockchain network 400 may be reflected into the game server 200.

When the blockchain network 400 exists inside the game server 200 (that is, when the game server 200 manages the blockchain network 400), the game server 200 blocks the blockchain through internal communication. The item transaction history 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 the ownership of the first item is successfully transferred to the second user, the game server 200 moves the first item from the temporary item storage space. By moving to a different location (the first user or the second user's in-game inventory), the first item can 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 the smart contract in the blockchain network 400 itself It may be performed according to the execution of. For example, when changing ownership of the first item from a first user to a second user who wants to purchase the first item, a first associated with the first user from a second externally owned account associated with the second user A procedure for generating a transaction or message on the blockchain network to deliver at least a portion of the transaction cost of the first item to an externally owned account may be performed.

In embodiments of the present disclosure, the game server 200 and/or item exchange server 300 may operate off-chain. In this case, the game server 200 and/or the item exchange server 300 may communicate with an external blockchain network to perform item trading. Also, 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 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 Fig. 4]

4 exemplarily illustrates an item trading method performed by 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 in FIG. 4 may be omitted or additional steps may be present 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 receive a transaction request for the first item directly 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 receives from the first user from the game server 200. A signal that a transaction request for the first item has been made may be received.

In one embodiment of the present disclosure, the first item may mean a game item in a form that can be played and traded in the game. In addition, the item exchange server 300 may allow a game item of any type that can be played in a plurality of games (ie, world units) as well as a single game (a service unit) to be traded.

The transaction request for the first item may be in the form of a message containing an indication to sell or rent the first item, or 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 smart contracts and transactions based on transaction request information for the first item. In the latter case, the smart contract generated in the user terminal 100 may be included in the transaction and delivered to the item exchange server 300 (or 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 the item storage space managed in the game server 200 (420 ). When it is determined that the item exchange server 300 issues the transaction including the first item to the blockchain network 400, the corresponding item signal is transmitted to the game server 200, so that the item exchange server 300 is the first in the game server 200. The first item can 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 may block the 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 is generated and a transaction including the smart contract can 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 price auction transaction, a rental transaction, a general price designation transaction, an advertisement generation transaction, and a donation generation transaction.

Item exchange server 300 from the first user, the owner of the first item, the private key of the item exchange server 300 or the private key of the game server 200 or the corresponding information (eg, within the game server 200) It can receive identification information, etc. for the first item of the. The game item server 300 may generate smart contracts and transactions based on the received information. The received information may be written in the input value (or input field) or output value (or output field) of the transaction.

In a further embodiment, the game server 200 is configured to allow transactions to a temporary item accommodating space on the blockchain network 400 having an address/account corresponding to the item storage space in the game server 200. , The game server 200 or the first user's private key or the corresponding information (eg, identification information) may be transmitted to the item exchange server 300. The item exchange server 300 receiving the information generates a smart contract operable on the blockchain network 400 based on the information received from the game server 200 and blocks the transaction including the smart contract on the blockchain network. It can also be issued at 400.

As a further embodiment, the item exchange server 300 may issue a smart contract and a transaction for performing the transaction of the first item using its private key or corresponding information. In this case, the authority for interaction with the blockchain network 400 is held by the item exchange server 300, and the item exchange server 300 performs interaction with the blockchain network 400 and displays the resultant value of the game server ( 200) and/or the user terminal 100.

As described above, the item exchange server 300, in order to perform an item transaction on the first item, a private key (or the same) associated with at least one of the first user, the item exchange server 300 and the game server 200 Using the corresponding arbitrary form of encryption information), it is possible to create a transaction for moving the first item to the blockchain address associated with the temporary item accommodating space. In this case, the transaction may include a transaction input value including signature information generated from the 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 storage space having an address on the blockchain network 400 corresponds to the temporary item storage space of the game server 200 (eg, a safe in the game, a common inventory, an item trading inventory, an item exchange). Can be. That is, since the transaction histories for game items generated in the temporary item storage space implemented in the game server 200 can be stored in the temporary item accommodating space in the corresponding blockchain network, reliability and integrity of the item transaction This 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 the smart contract is distributed to the blockchain network 400, a contract account corresponding to the smart contract may be generated. The contract account may store transaction information or transaction history information included in the item storage space of the game server 200. Additionally, if a contract account has already been created, a new contract account is not generated, and the corresponding transaction and smart contract can be recorded in the existing generated 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 generated for item trading, and a hash value for the byte code of the smart contract for item trading. In addition, the address of the contract account may be generated based at least in part on at least one private key of the first user, the game server, and the item exchange server or the corresponding encryption information. In one example, the address of the contract account may be generated based on the 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 smart contracts for item trading and item transaction history information. According to one embodiment of the present disclosure, when only the smart contract and item transaction history information are included in the block distributed to the blockchain network 400, the block size of the blockchain can be minimized in performing the item transaction. , It is possible to reduce the generation time of the block and the propagation time of the block, and also reduce the computing resources for storing the block.

In addition, smart contracts are distributed to the blockchain network 400 based on a consensus algorithm by a plurality of nodes, where 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 in an off-chain, an item trading procedure may be performed while interacting with an external blockchain network. In addition, when the item exchange server 300 operates on-chain, the blockchain network 400 may be included in the item exchange server 300.

After issuing a transaction to the blockchain network 400, the item exchange server 300 may receive a transaction request for a first item from a second user who wants to trade the first item (440 ). In one embodiment, the item exchange server 300 may receive a purchase request for a first item from a second user who confirms 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 the 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 receives from the second user from the game server 200. A signal that a purchase request for the first item has been made may be received.

In one embodiment, a purchase request for a first item from a second user may be in the form of a message containing an indication to purchase the first item, or a transaction that may 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 delivered to the item exchange server 300 side. In this example, the user terminal 100 may include any type of API capable of creating an actionable transaction in the blockchain network 400, and the item exchange server 300 is the user terminal of the second user It may serve to deliver a transaction for performing the item transaction generated at 100 to the blockchain network 400.

As an additional embodiment, the user terminal 100 of the second user may issue a transaction directly to the blockchain network 400, in which case the item exchange server 300 interacts with the blockchain network 400. You can recognize the fact that the transaction is issued.

In one 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 such a transaction, a smart contract pre-stored in the blockchain network 400 may be called by step 430. As an example, after receiving the signal including the indication that the second user wants to purchase the first item from the second user, the item exchange server 300 checks whether the signal satisfies the purchasing condition suggested by the first user. , If satisfied, a transaction to call a smart contract can be created. As another example, the item exchange server 300 may deliver the 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 you want to purchase a first item from a second user into a form of a transaction operable on the blockchain network 400.

Although not shown in FIG. 4, as an additional embodiment, the item exchange server 300 may deliver the game server 200 or the first user's user terminal 100 that a purchase request from the second user has been 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 to call 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 informs the user terminal of the second user that the transaction is not approved and sends a separate transaction to the blockchain network 400. It may not be issued.

Although not shown in FIG. 4, as an additional embodiment, as the smart contract stored in the blockchain network 400 is executed, a message that a purchase request from a second user has been received may be delivered 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 proceeding 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 process, and the user terminal or game server of the second user ( 200) or the item exchange server 300 may be executed by delivering a notification that the transaction has not been made.

In an embodiment of the present disclosure, when the item exchange server 300 executes a smart contract for trading an item, a settlement procedure for a transaction amount between the account of the first user and the account of the second user is performed , In order to allow the first item in the game server 200 to be moved from the temporary item storage space to the second user's inventory, a signal may be transmitted to the game server 200 (460 ). For example, the game server 200, the item exchange server (1) the item exchange between the first user and the second user as the smart contract is executed from the blockchain network 400 or the item exchange server 300, the item exchange server ( 300), it may be determined that the first item moved to the temporary item storage space in the game is moved to the second user's in-game inventory.

When the blockchain network 400 exists outside the game server 200, the game server 200 displays the transaction history information generated in the blockchain network 400 in the blockchain network 400 or item exchange server 300. It can be received/acquired from, and the corresponding information can be reflected in the game server 200. Accordingly, the item transaction history information in the item storage space of the game server 200 and the item transaction history information in the temporary item accommodation space in the blockchain network 400 may be interlocked. Additionally, when a difference in information between the item storage space of the game server 200 and the item storage space on the blockchain network 400 occurs, the priority is given to the item storage space on the blockchain network 400. It can be determined. Accordingly, the item transaction history information recorded in the item storage space in the game server 200 may be updated with the item transaction history information recorded in the item accommodation space on the blockchain network 400. In this way, the history of the transaction of integrity items 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 this, the updated/changed item transaction history in the blockchain network 400 may be transmitted to the game server 200.

Additionally, if the first user cancels the sale of the first item, or if the ownership of the first item is successfully transferred to the second user, the item exchange server 300 is provided by the game server 200. A signal for moving the 1 item from the temporary item storage space to another location (the 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 the smart contract in the blockchain network 400 itself It may be performed according to the execution of. For example, when changing ownership of the first item from a first user to a second user who wants to purchase the first item, a first associated with the first user from a second externally owned account associated with the second user A procedure for generating a transaction or message on the blockchain network to deliver at least a portion of the transaction cost of the first item to an externally owned account may be performed. Through this procedure, the ownership change history information 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 performed through the smart contract. Can.

[Description of Fig. 5]

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

5 exemplarily illustrates an item transaction method performed on a computing device operating as a node constituting the blockchain network 400, wherein the computing device is a game server 200, an item exchange server 300, and a user terminal 100 and/or an external computing device.

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

A smart contract for trading game items in a manner in which integrity and stability are guaranteed and user convenience is maximized according to an embodiment of the present disclosure may include the following sub-contracts (or functions).

The smart contract is configured to move the first item to a temporary item accommodating space in the blockchain network 400 for the item transaction, while ensuring that the ownership of the first item belongs to the first user who requested the item transaction. It may include one sub-contract. In addition, the first sub-contract may generate a signal for causing the first item to change to a state that is not usable in the game when the first item is moved to the temporary item receiving 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 wants to purchase the first item, and When the transaction condition of the first item is satisfied, a second sub-contract that changes 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 and recorded from the first user to the second user.

In one embodiment of the present disclosure, the smart contract, when changing the ownership of the first item from the first user to the second user who wants to purchase the first item, the second externally owned account associated with the second user ( Or generating a transaction on the blockchain network to transfer at least a portion of the transaction cost of the first item from the wallet associated with the second user) to the first externally owned account associated with the first user (or 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 regarding the transaction cost. In this case, based on the notified information, the actual transaction cost may be settled by the game server 200 or the item exchange server 300 and the settlement amount may be paid to the user. In this embodiment, the user does not need to have components such as wallets 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. And a fourth sub-contract that allows the first item to be returned to a usable state in the game by moving from the temporary item receiving space to another location. For example, when the fourth sub-contract is called as the first user issues a transaction for canceling the sale of the first item, the space for receiving the temporary item within the blockchain network 400 is the first item. It is possible to generate a transaction or message for moving from the address of the first user to the address of the first user and issue it to the blockchain network 400.

According to an embodiment of the present disclosure, when the ownership of the first item is transferred to the 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 a donation. 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 a portion of an item transaction amount as a donation, or according to a policy of the game server 200 (item exchange server 300) When at least a part of the transaction amount is to be used as a donation, the amount (or ratio) information 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. Therefore, 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 includes at least a portion of the costs that may be involved in operating the blockchain network 400, such as fees incurred in creating blocks and/or rewards paid to mining nodes. You may decide to use it as a donation. Accordingly, at least some of the fee costs incurred in creating the block can be automatically paid to a predetermined donation receiving account or address as the fifth sub-contract is executed, and the fifth sub-contract is a transaction or message for such payment. Can generate

When the transfer of the donation to the predetermined externally owned account for receiving the donation is completed, the balance information of the externally owned account that received the donation may be stored in the blockchain network 400. For example, balance information can 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 (Unspent Transaction Output) method. In this case, the balance information may be confirmed as the sum of UTXO through a search to the UTXO DB.

In one embodiment of the present disclosure, at least a portion of the sale price of the first item or at least a portion of the fee to the blockchain network may be replaced with coins available in the game or specific assets in the game. For example, at least a portion of the sale price of the first item or at least a portion of the fee to the blockchain network may be used as a prize 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 sale price of the first item or at least a portion of the fee to the blockchain network may be replaced with stats of the first item's seller or buyer's in-game character.

In FIG. 5, the computing device may verify the first transaction issued to the blockchain network 400 and include the first transaction in the first block generated according to the predetermined consensus algorithm (520 ). Accordingly, the first block may be shared in the blockchain network 400. The verification for the first transaction may be performed based on information such as whether the subject who issued the first transaction has ownership of the first item, for example.

In addition, verification of the first transaction may be performed based on the 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 first key is assigned to the private key of the first user or the private key of the game server (item exchange server) or the first item The signature can be made with the private key. By using the signature information of the private key and the information of the public key corresponding to the private key (for example, the private key is compared with the hash value generated by passing a predetermined hash function (eg, elliptic curve multiplication function) and the public key value) By doing so), verification of the first transaction can be done at the computing device. By using such a public key infrastructure (PKI), it can be verified who owns the subject or item that issued the transaction.

In addition, the computing device may store the verified transaction in a transaction pool located in its local storage. In addition, the computing device can execute a consensus algorithm to create a block to contain 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, blocks distributed to the blockchain network may include smart contracts and item transaction history information for performing item transactions, thereby reducing the size of blocks and consensus time and computing resource usage accordingly. Can be reduced.

In the manner described above, smart contracts may be included in blocks and distributed to the blockchain network 400. In addition, when the smart contract is distributed to the blockchain network 400, a contract account corresponding to the smart contract may be generated in the blockchain network 400. For example, the contract account in which the smart contract is stored may include the number of smart contracts generated for the item transaction, and a hash value for the byte code of the smart contract for the 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. Therefore, 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 the temporary item receiving space having the 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 a signature information generated from the private key, and a transaction output including identification information for a first item and blockchain address information associated with the temporary item accommodation space The first transaction containing the value can be recorded in the blockchain network.

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

In a further embodiment of the present disclosure, the computing device in the blockchain network 400, when a new update / change occurs as the block in the blockchain network 400 is stored, the update / change the game server The 200 and/or 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 corresponding updates/changes. Accordingly, the game server 200 and/or the item exchange server 300 may reflect the change history in the blockchain network 400 in its local storage. For example, the computing device of the blockchain network 400 may transmit a message that the game item transaction between the first user and the second user has been recorded within the blockchain network 400 as the smart contract is called, and/or the game server 200 and/or Or it can be delivered to the item exchange server 300. In response, 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 the purchase request for the first item from the second user (540 ). The second transaction can be issued from a second user or from a game server (item exchange server).

After verifying the second transaction, the computing device may share the second block in the blockchain network 400 by including the second transaction in the second block generated according to the consensus algorithm (550). The computing device can verify the second transaction and store the verified second transaction in a transaction pool located in its local storage. In addition, the computing device can execute a consensus algorithm to create a block to contain 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, which is generated from an externally owned account associated with the second user who wants to purchase the first item or related to the game server, the first item stored in the contract account In order to perform a transaction, a smart contract that was included in the first transaction may be called. Accordingly, since at least one of the sub-contracts included in the smart contract is executed, integrity can be guaranteed and automated item trading 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 first user's account and the second user's account (570). For example, when ownership of the first item is transferred to the second user as the smart contract is executed, at least a portion of the sales amount of the first item is externally owned by the first user from an externally owned account of the second user Transactions or messages for delivery to the account may occur on the blockchain network 400. Also, as the smart contract is executed, a transaction or message for storing information 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. Also, as the smart contract is executed, the first item may be moved from the temporary item accommodating space on the blockchain network 400 to a space related to the second user on the blockchain network 400.

[Description of Fig. 6]

6 shows an exemplary flowchart of an item trading scheme according to one embodiment of the present disclosure.

The flowchart illustrated in FIG. 6 illustratively represents a game item trading technique in which the game server 200, the item exchange server 300, and the blockchain network 400 operate as separate entities. Of the features shown in FIG. 6, for features that overlap with those previously described with reference to FIGS. 3 to 5, the contents described in FIGS. 3 to 5 will be referred to, and the description thereof will be omitted.

As shown 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 (edits) the content to the item exchange server 300 Examples of are 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 transmitted to the game server 200 in order to prevent the first item that may be the object of the transaction from being extinguished in the game or transferred to another person before being propagated to the blockchain network 400. The storage request signal for the first item may be transmitted.

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 in a game (eg, a safe box, etc.) in which users can perform item transactions in the server. The game server may limit the first item from being played in the game by moving the first item located in the first user's inventory to the item storage space managed by the game server.

Additionally, the game server may notify users through UI/UX that an item moved to an item storage space in the server may be a transaction target. For example, a user accessing the game server can access the corresponding item storage space in the game and check the information of the items to be traded.

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

When such a transaction is propagated to the blockchain network 400, the first item may be moved to the temporary item accommodation space on the blockchain network 400. Moving to the temporary item accommodating space here 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 trading the item on the blockchain network 400. It means being moved. As another example, the movement to the temporary item accommodation space may mean that the first item is newly registered in the temporary account or address for item transaction on the blockchain network 400.

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

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

As another example, when the ID and PASSWORD are input by the first user who accesses the game server 200, and thus the first user's authentication is performed in the game server 200, the game server 200 is an item exchange. The server 300 may also transmit an authentication completion signal informing that the first user's authentication has been performed. In this case, the item exchange server 300 may generate and issue a transaction using its own private key in response to receiving the authentication completion signal from the game server 200. In this situation, when the 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 it by including the transaction in the block generated through the 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 the corresponding transaction is recorded in the blockchain network 400 through the transaction ID (Tx ID) of the transaction issued by itself. As another example, the item exchange server 300 may receive a message from the blockchain network 400 that a transaction issued by itself is recorded.

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

In a further embodiment, the block generated by the blockchain network 400 may transmit a signal that the generated block has been propagated to the game server 200 and/or user terminals 100a and 100b after the generated block is propagated.

The item exchange server 300 may also announce that the first item is a transaction target by updating the list of tradeable items in the item exchange server 300. In this case, the user terminals 100a and 100b may check what the transaction target item is by accessing the item exchange server 300 and checking the updated list of tradeable items.

The second user terminal 100b confirming 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 a further embodiment, the 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 delivers the content to the item exchange server 300 Accordingly, a purchase request message may be delivered to the first item. 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 a smart contract call 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 for a contract account in which the smart contract is stored. The item exchange server 300 may obtain contract account information in which the smart contract included in the corresponding transaction is stored after issuing a transaction for moving the temporary item to the temporary item accommodating space so that the first item becomes a transaction target.

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

For example, a transaction may be generated through the signature of the second user's private key and the private key of the exchange server 300 (ie, two private keys). In this situation, in order to verify the transaction 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 the ID and PASSWORD are input by the second user accessing the game server 200, and accordingly, the user authentication of the second user is performed in the game server 200, the game server 200 is an item exchange The server 300 may transmit an authentication completion signal 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 the authentication completion signal from the game server 200. In this situation, when the 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, the item exchange server 300 checks coin information in the externally owned account (or wallet) of the second user when issuing a transaction that includes the transaction intention of the second user , If the coin information is less than the price information of the first item, it is possible to cancel the issuance of the transaction and deliver the content to the second user terminal 100b.

The blockchain network 400 may verify the transaction issued from the item exchange server 300 and include the transaction in the block generated through the consensus algorithm to share it (617). By the above procedure, a transaction for the purchase 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. In addition, as a transaction for the purchase of the first item is recorded, the corresponding 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, ownership of the first item is changed to the second user, and at least a portion 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 can be moved from the temporary item accommodating space to the address associated with the second user on the blockchain network 400. In a further embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract so that information regarding 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 is performed, 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 may provide the game server 200 and/or user terminals 100a, 100b for the first item. The content that the transaction between the first user and the second user is 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. It can be (623).

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

The item exchange server 300 may store updated transaction history information on its DB so that the user terminals 100a and 100b can confirm that the transaction amount has been settled (or that 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 one embodiment of the present disclosure, the item exchange server 300 may compare the transaction history information stored in its DB with the 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 on its DB, the item exchange server 300 records in the blockchain network 400 Prioritize 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 Fig. 7]

7 shows an exemplary flow chart of an item trading scheme according to one embodiment of the present disclosure.

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

Of the features shown in FIG. 7, for features overlapping with the features described above with reference to FIGS. 3 to 6, the contents described in FIGS. 3 to 6 will be referred to, and the description thereof will be omitted.

As shown 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 blockchain network 400 and the game server 200 blocks the blockchain network 400 or the first user terminal ( 100a) is also possible in the form of receiving the content from the embodiment.

The game server 200 inventory of the first user in order to prevent the first item, which may be the object of the transaction, from being extinguished in the game or transferred to another person before being propagated to the blockchain network 400. From can be transferred to a separate item storage space in the game server (200). 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 it cannot be a play target in the game.

The game server 200 may analyze the transaction request information for the first item from the first user, generate a smart contract reflecting the transaction request information, and issue the generated smart contract to the blockchain network 400 Yes (705).

In one embodiment of the present disclosure, in creating a transaction for invoking a smart contract, a private key of at least one 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 value of the transaction.

For example, a transaction may be generated through a signature from the first user's private key and the game server 200's private key (ie, two private keys). In this situation, when the 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 the ID and PASSWORD are input by the first user accessing the game server 200, and accordingly, the first user's authentication is performed in the game server 200, the game server 200 may Transactions can be created and issued using the private key. In this situation, when the 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 it by including the transaction in the block generated through the consensus algorithm (707). By this 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 game server 200 may check whether the corresponding transaction is recorded in the blockchain network 400 through the transaction ID (Tx ID) of the transaction issued by itself. As another example, the game server 200 may receive a message from the blockchain network 400 that a transaction issued by itself is recorded.

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

As another embodiment, the user terminals 100a and 100b may issue a query directly 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 confirming the transaction condition for the first item may transmit a purchase request message for the first item to the game server 200 (711). As a further embodiment, the second user terminal 100b directly transmits the transaction including the purchase request message for the first item to the blockchain network 400 and the game server 200 transmits the blockchain network 400. Through the method of delivering the corresponding content, a purchase request message for the first item may be delivered.

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

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

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

For example, a transaction may be generated through the signature of the second user's private key and the private key of the game server 200 (ie, two private keys). In this situation, when the 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 authentication is performed by the second user accessing the game server 200, the game server 200 may generate and issue a transaction using its own private key. In this situation, when the 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, the game server 200 confirms coin information in the externally owned account (or wallet) of the second user when issuing a transaction that includes the transaction intention of the second user, If the coin information is less than the price information of the first item, it is possible to cancel the issuance of the transaction and deliver the content to the second user terminal 100b.

The blockchain network 400 may verify the transaction issued from the game server 200 and share it by including the corresponding transaction in the block generated through the consensus algorithm (715). By the above procedure, a transaction for the purchase 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. In addition, as a transaction for the purchase of the first item is recorded, the corresponding 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, ownership of the first item is changed to the second user, and at least a portion 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 can be moved from the temporary item accommodating space to the address associated with the second user on the blockchain network 400. In a further embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract so that information regarding such changes and movements can be recorded in the blockchain network 400. have.

As the smart contract in the blockchain network 400 is executed, ownership of the first item is changed to the second user, and at least a portion 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 can be moved from the temporary item accommodating space to the address associated with the second user on the blockchain network 400. In a further embodiment, separate transaction(s) may be generated and propagated within the blockchain network 400 based on the smart contract so that information regarding 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 performed, 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 with the user terminals 100a and 100b. You can convey that you are done. In addition, the blockchain network 400 may transmit the content that the transaction for the first item is 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, the game server 200 plays the first item located in the item storage space in the game server 200 in response to receiving a separate item transfer notification from the second user terminal 100b. It can also be moved to a second user inventory that can be managed by a second user within the server 200.

The game server 200 may store updated transaction history information on its DB so that the user terminals 100a and 100b can confirm that the transaction amount has been settled (or that 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 one embodiment of the present disclosure, the game server 200 may compare transaction history information stored on its DB with transaction history information recorded in the blockchain network 400. Based on this comparison, when there is a difference between the transaction history information recorded in the blockchain network 400 and the transaction history information stored on its DB, the game server 200 is recorded in the blockchain network 400 Prioritize transaction history information. In this case, for example, the game server 200 may replace the transaction history information recorded in its DB with the transaction history information recorded in the blockchain network 400.

[Description of Fig. 8]

8 shows an exemplary flowchart of an item trading scheme according to one embodiment of the present disclosure.

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

Of the features shown in FIG. 8, for features overlapping with the features described above with reference to FIGS. 3 to 7, the contents described in FIGS. 3 to 7 will be referred to, and the description thereof will be omitted.

As shown 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 the first item from the inventory of the first user in the game server 200 in order to prevent the first item from being extinguished 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 it cannot be a play target in the game.

The game server 200 may analyze the transaction request information for the first item from the 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 the blockchain network, and the transaction may be propagated and recorded in the blockchain network (807). By the transaction, the first item can be moved to the temporary item accommodating space having the address of the blockchain network. In addition, it can be recorded that the first item is subject to a transaction 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 these 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 may operate as a private blockchain. When operating as a private blockchain, since the blockchain network is implemented by a small number of nodes compared to the public blockchain under the management of the game server 200, the verification and consensus process is fast, so the user experience in performing item transactions is fast. Not only can it be increased, but also efficient use of network resources and computing resources can be made possible.

The blockchain network managed by the game server 200, and nodes on the network can share the verified and distributed ledger (e.g., data in blocks or blocks), thereby forging and altering data, which is a key characteristic of blockchain technology. The advantage that it becomes impossible can be achieved.

Here, the blockchain network managed by the game server 200 means that only the computing devices owned by the game server 200 can configure the blockchain network as an authorized node, but additionally, control of the game server 200 Underneath external nodes or external nodes authorized by the game server 200 may also constitute a blockchain network.

As an additional embodiment, the game server 200 and the item exchange server 300 may configure a blockchain network in the form of a consortium. In the case of this embodiment, the 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 may have the same or different rights within the blockchain network. Can have For example, when each entity has a different authority, only nodes related to the game server 200 can participate in the consensus process, and nodes related to the item exchange server 300 perform only a role of creating or verifying a transaction. It might be.

The game server 200 transmits a signal to the user terminals 100a and 100b that the first item is a transaction target, or uploads the content to the game server 200 to the user terminals 100a and 100b. It may be announced that the first item is the target of the transaction (809). The signal that the transaction is targeted includes, for example, identification information for the first item, transaction condition information for the first item, owner information of the first item, transaction ID information of the blockchain network associated with the first item, and The smart contract related to the first item may include at least one of address information of a contract account stored therein. The user terminals 100a and 100b may access the game server 200 to check a list of game items to be traded and transaction history information.

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

The second user terminal 100b confirming the transaction conditions 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 a smart contract call to the blockchain network based on the information included in the purchase request from the second user terminal 100b (813).

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

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

For example, a transaction may be generated through the signature of the second user's private key and the private key of the game server 200 (ie, two private keys). In this situation, in order to verify the transaction in the 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 authentication is performed by the second user accessing the game server 200, the game server 200 may generate and issue a transaction using its own private key. In this situation, in order to verify the transaction in 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 is included and shared in the block generated through the consensus algorithm (815). By the above procedure, a transaction for the purchase of the first item can be recorded in the blockchain network of the game server 200, and the information included in the recorded transaction can be stored in a state in which integrity can be guaranteed. In addition, as a transaction for the purchase of the first item is recorded, the corresponding 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 to the user terminals 100a and 100b that the transaction between the first user and the second user for the first item is completed.

In addition, the game server 200 may issue a query to the blockchain network using Tx ID (based on internal communication) 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 this by uploading the transaction information to their 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, the game server 200 plays the first item located in the item storage space in the game server 200 in response to receiving a separate item transfer notification from the second user terminal 100b. It can also be moved to a second user inventory that can be managed by a second user within the server 200.

As the smart contract in the blockchain network of the game server 200 is executed, 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. It is delivered to the user's account, and the first item can be moved from the temporary item accommodating space having the address on the blockchain network to the address associated with the second user, whereby the item transaction cost settlement procedure can be performed (819). .

The game server 200 may store updated transaction history information on its DB so that the user terminals 100a and 100b can confirm that the transaction amount has been settled (or that 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 Fig. 9]

9 shows an exemplary flow chart of an item trading scheme according to one embodiment of the present disclosure.

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

Of the features shown in FIG. 9, for features overlapping with the features described above in connection with FIGS. 3 to 8, the contents described in FIGS. 3 to 8 will be referred to, and the description thereof will be omitted here.

As shown 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 the first item from the inventory of the first user in the game server 200 in order to prevent the first item from being extinguished in the game or transferred to another person after the first item becomes a transaction target. 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 it cannot be a play target in the game.

The item exchange server 300 analyzes transaction request information for the first item from the first user, generates a smart contract reflecting the transaction request information, and creates a transaction including the generated smart contract and blocks it It can be published over the network (907).

By the transaction, the first item can be moved to the temporary item accommodating space having the address of the blockchain network. In addition, it may be recorded that the first item is 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 computing devices among these 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 may operate as a private blockchain. When operating as a private blockchain, since the blockchain network is implemented by a small number of nodes compared to the public blockchain under the management of the item exchange server 300, the verification and consensus process is fast, so the user experience in performing item trading Not only can this increase, but also the efficient utilization of network resources and computing resources can be enabled.

The blockchain network managed by the item exchange server 300, and nodes on the network can share the verified and distributed ledger (e.g., data in blocks or blocks), thereby forging and counterfeiting data, which is the main characteristic of blockchain technology. The advantage that modulation becomes impossible can be achieved.

Here, the blockchain network managed by the item exchange server 300 means that only the 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 ), or external nodes under the control of 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 configure a blockchain network in the form of a consortium. In the case of this embodiment, the 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 may have the same or different rights 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 perform only the role of creating or verifying a transaction. It might be.

The item exchange server 300 transmits a signal 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 DB, and the first item is It can be announced that the transaction is subject (911). The signal that the transaction is targeted includes, for example, identification information for the first item, transaction condition information for the first item, owner information of the first item, transaction ID information of the blockchain network associated with the first item, and The smart contract related to the first item may include at least one of address information of a contract account stored therein. The user terminals 100a and 100b may access the item exchange server 300 and/or game server 200 to check a list of game items to be traded and transaction history information.

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

The second user terminal 100b confirming 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 a smart contract call to the blockchain network based on the information included in the purchase request from the second user terminal 100b (915).

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

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

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

Additionally, when the user authentication of the second user is made by the second user who accesses the game server 200, the game server 200 informs the item exchange server 300 that the second user has been authenticated, and provides his/her own private key. You can also pass 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, in order to verify the transaction in the 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 is included in the block generated through the consensus algorithm and can be shared (917). By this procedure, a transaction for the purchase of the first item can be recorded in the blockchain network of the item exchange server 300, and the information included in the recorded transaction can be stored in a state in which integrity can be guaranteed. . In addition, as a transaction for the purchase of the first item is recorded, the corresponding 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 associated with 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, 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 removed from the account of the second user. It is delivered to the account of the 1 user, and the first item can be moved from the temporary item accommodating space having the address on the blockchain network to the address associated with the second user, whereby the item transaction cost settlement procedure can be performed.

The item exchange server 300 may transmit to the game server 200 and/or user terminals 100a and 100b that the transaction between the first user and the second user for the first item is completed (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 game server 200 allows the user terminals 100a and 100b accessing the game server 200 to check this by uploading the corresponding 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, the game server 200 plays the first item located in the item storage space in the game server 200 in response to receiving a separate item transfer notification from the second user terminal 100b. It can also be moved to a second user inventory that can be managed by a second user within the server 200.

The item exchange server 300 may store updated transaction history information on its DB so that user terminals 100a and 100b can confirm that the transaction amount has been settled (or that the transaction has been completed) (925). . Additionally, the item exchange server 300 may transmit the content that the transaction is completed to the game server 200, and the game server 200 may reflect it on its 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 Fig. 10]

10 exemplarily illustrates an item transaction method in the blockchain network 400 according to an embodiment of the present disclosure. 10 exemplarily shows how the blockchain network 400 operates in response to the receipt of 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.

The client A 1000a may generate a first transaction 1010 for requesting an item transaction. The client A 1000a may generate a smart contract for reflecting it according to 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 about the owner of the first item and the transaction price of the first item (eg, sale price: 20 Coin). Additionally, the 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) constituting the blockchain network 400 (400a, 400b, 400c, and 400d) may receive the first transaction 1010, propagate and share it (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 can share any form of transaction to allow item trading and store the content in the transaction DB. In the case of the blockchain network 400 capable of supporting smart contracts, an application related to the smart contract can be executed according to the content of the transaction and the result can be reflected in the smart contract DB.

The 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. As an example, 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 can verify the first block received and store the first block in their local storage, whereby the first block on the blockchain network 400 can 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, a smart contract included in the first block can be executed, and accordingly, the first item that can be a transaction target has a temporary item accommodating 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 may include, for example, identification information for the first item, 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 The transaction price of the first item (eg, purchase price: 20 Coin) may be included.

The second transaction 1020 can also be propagated and shared with the blockchain network 400, like the first transaction 1010.

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, in the example in FIG. 10 As an example, 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 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 allow the smart contract included in the first transaction 1010 to be By calling, a smart contract can be executed (1025).

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

The above-described embodiments in FIG. 10 illustrate the operation of an exemplary blockchain network 400 for performing an item registration procedure and an item purchase procedure for item trading, and the following is an example of an item inquiry procedure for item trading Describes the process (item inquiry operation method).

With regard to 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 inquiry operation, the stored state value in the smart contract DB can be inquired without changing the data of the blockchain, so the query information for this search need not be synchronized to the blockchain. Therefore, the node of the blockchain network 400 can check its DB and respond immediately to the query regardless of the block synchronization timing. As described above, processing of the search query in the blockchain network 400 is performed 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 what node is connected to. , Query response speed may be faster than query response service through an intermediary.

[Description of Fig. 11]

11 illustrates an exemplary UI (User Interface) configuration 1100 for performing an 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 upon input to a sales tab. The UI configuration 1100 may be generated by the game server 200 or the item exchange server 300.

The UI configuration 1100 illustrated 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 interaction based on the corresponding UI configuration 1100. Additionally, when a predetermined input action for a specific item is received from the user terminal 100, the game server 200 or the item exchange server 300 outputs the exchange UI configuration 1100 for trading for the corresponding item. Can.

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

As illustrated in FIG. 11, the UI configuration 1100 for allowing game item sales displays identification information (image or text) of the item, displays the sale price of the item, and displays the sale quantity of the item. , Display the maximum sales limit information of the item, display the average sales price for the item, display the commission information incurred when selling, display the amount of coins currently held by the user, and display the item's sales registration and cancellation tabs And/or an input tab for entering the price and quantity of the item. The aforementioned displays and tabs may be output within one screen or may be output through separate screens.

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

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

Although not illustrated in FIG. 11, the UI configuration 1100 may display transaction content information of the item. For example, the transaction content information of an item may be represented by a separate tab, and in the corresponding tab, transaction history for a specific item and item transaction history information for a specific user may be displayed.

[Description of Fig. 12]

12 illustrates an exemplary UI configuration for performing an 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 an 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 output when input to a purchase tab.

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 illustratively 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 interaction based on the corresponding UI configuration 1200.

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

12, the game server 200 or the item exchange server 300 as the user terminal 100, the name of the item, the category (category) of the item, the type of item, the grade of the item, the sorting of the item The maximum price information of the rule and/or 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 the UI configuration 1200, a search/query 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. The result information may include identification information of an item, owner information of an item, sales condition information, and/or sales price information, as shown in the right screen of FIG. 12.

These displays and tabs may be output within one screen or may be output through separate screens.

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) may issue a transaction to call an existing smart contract. By such a transaction, reliable and automated item trading 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 second user's inventory and output it.

[Description of Fig. 13]

13 exemplarily illustrates 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 includes, for example, a first sub contract 1310 and a second sub contract 1320 ), the third sub-contract 1330, the fourth sub-contract 1340, and the fifth sub-contract 1350.

According to an embodiment of the present disclosure, the smart contract can achieve the transaction of game items in a manner in which integrity and stability are guaranteed and user convenience is maximized. The sub-contract in this specification is a component constituting a smart contract, and may mean a group or function (including a group of functions) of codes that perform a specific function.

The smart contract moves the first item to the temporary item receiving space in the blockchain network 400 for the item transaction, while ensuring that the ownership of the first item belongs to the first user who requested the item transaction. Sub-contracts may be included. In a further embodiment, the first sub-contract may generate a signal to cause the first item to change to an unusable state in the game when the first item is moved to the temporary item receiving 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 the purchase request for the first item from the second user who wants to purchase the first item, and When the transaction condition of the first item is satisfied, a second sub-contract that changes 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 and recorded from the first user to the second user.

In one embodiment of the present disclosure, the smart contract, when changing the ownership of the first item from the first user to the second user who wants to purchase the first item, the second externally owned account associated with the second user ( Or a transaction or message to transfer at least a portion of the transaction cost of the first item from the wallet associated with the second user) to the first externally owned account associated with the first user (or 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, based on the transmitted information, the actual transaction cost is deposited and withdrawn to the game server 200 or the item exchange server 300, and the game server 200 or the item exchange server 300 settles it and is settled to the user You may decide to pay. In the case of such an embodiment, the user does not need to have components such as wallets on a separate blockchain network 400, and uses the wallet of the game server 200 or item exchange server 300, the game server Deposit or withdrawal is made to the 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. And a fourth sub-contract that allows the first item to be returned to a usable state in the game by moving from the temporary item receiving space to another location. For example, when the fourth sub-contract is called as the first user generates a transaction for canceling the sale of the first item, the space for accommodating the temporary item within the blockchain network 400 is the first item. It is possible to generate a transaction or message for moving from the address of the first user to the address of the first user and issue it to the blockchain network 400.

According to an embodiment of the present disclosure, when the ownership of the first item is transferred to the 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 a donation. 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 a portion of an item transaction amount as a donation, or according to a policy of the game server 200 (item exchange server 300) When at least a part of the transaction amount is to be used as a donation, the amount (or ratio) information 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. Therefore, 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 includes at least a portion of the costs that may be involved in operating the blockchain network 400, such as fees incurred in creating blocks and/or rewards paid to mining nodes. You may decide to use it as a donation. Accordingly, at least some of the fee costs incurred in creating the block can be automatically paid to a predetermined donation receiving account or address as the fifth sub-contract is executed, and the fifth sub-contract is a transaction or message for such payment. Can generate

When the transfer of the donation to the predetermined externally owned account for receiving the donation is completed, the balance information of the externally owned account that received the donation may be stored in the blockchain network 400. For example, balance information can 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 may be confirmed as the sum of UTXO through a search to the UTXO DB.

In a further embodiment, the smart contract includes advertisement information (eg, text information, image information and video information related to the game or item) generated by the user terminal 100 or the game server 200 or the item exchange server 300. It may also include. When a transaction is made with the user terminal 100 receiving the advertisement information, the content of providing a reward such as a discount of the cost associated with the item transaction to the 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 the transaction converted to the Byte code form is included in the block 1303, and the blockchain network 400 Can be propagated to A smart contract converted to Byte code may be executed by a computing device in the blockchain network 400 (eg, by a virtual machine of the computing device). Further, the compiler 1301 in the present disclosure may include any form of program for converting 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 a transaction of a game item is performed in a form in which On-chain and Off-chain are combined, it is possible to increase the user's experience through quick transaction processing and UI display, as well as reliability. A high and integrity guaranteed item transaction can be achieved.

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

In addition, according to an embodiment of the present disclosure, as only the item transaction history is recorded and managed on the smart contract and the blockchain network 400, the consensus speed of the blockchain increases, thereby improving the user's game service experience. Can.

According to an embodiment of the present disclosure, a stable item transaction may be allowed for a plurality of games to which the same blockchain is applied, and the value of the in-app item purchased through cash stops the game or disappears when the service ends Complaints can also be resolved.

Additionally, according to an embodiment of the present disclosure, item trading may be activated through a transparent item transaction using a blockchain, and thus, a fee may be generated to both game developers and exchanges.

Additionally, according to an embodiment of the present disclosure, a new form of providing a service for notifying the formation of a smart contract related to a blockchain, setting environment, and providing an execution result notification service by being authorized to provide a service externally on behalf of a game publisher 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 passing 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 Fig. 14]

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

As illustrated 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 block headers and transactions. 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 create 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 a predetermined difficulty value (which may be stored in the block header), a 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) ) May be connected to each other. In addition, in obtaining a block hash value, since a hash value of a transaction group, which is a hash value representing transactions, is used as an input value, when any forgery behavior for a transaction occurs, the hash value of the transaction group is changed. In this way, adjacent blocks can be connected to each other, and information of a transaction in the block can be stored with integrity.

Transactions of blocks 1400a, 1400b, and 1400c are transaction(s) included in a block among issued transactions, and when the transaction is included in a block, operations related to the transaction will be performed in the blockchain network 400 Can.

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

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

In addition, the transaction in block 302 (1400b) may include a transaction (Tx 1) that transfers 5 Coins from B to A, and a transaction (Tx 2) that creates or calls smart contract 2 from D.

In addition, the transaction in block 303 (1400c) may include a transaction (Tx 1) that transfers 10 Coins from F to E and a transaction (Tx 3) that generates or calls smart contract 1 from G.

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

[Description of Fig. 15]

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

The computer 1102 illustrated 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.

Although the present disclosure has been described above in general with respect to computer-executable instructions that can be executed on one or more computers, it is well understood by those skilled in the art that the present disclosure can be implemented in combination with other program modules and/or as a combination of hardware and software. You will know.

Generally, modules herein include routines, procedures, programs, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In addition, those of ordinary skill in the art may find that the methods of the present disclosure include single-processor or multiprocessor computer systems, minicomputers, mainframe computers, as well as personal computers, handheld computing devices, microprocessor-based or programmable consumer electronics, and the like (each of which is). It will be appreciated that it may be implemented with other computer system configurations, including those that may operate in conjunction with one or more associated devices.

The described embodiments of the present disclosure can also be practiced in distributed computing environments where certain tasks are performed by remote processing devices that are linked through a communications 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. Computer-accessible media includes volatile and non-volatile media, transitory and non-transitory media, 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 are volatile and non-volatile media, temporary and non-transitory media, removable and non-removable, implemented in any method or technology for storing information such as computer readable instructions, data structures, program modules or other data Includes media. Computer-readable storage media may include RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital video disk (DVD) or other optical disk storage device, magnetic cassette, magnetic tape, magnetic disk storage device or other magnetic storage Device, or any other medium that can be accessed by a computer and used to store desired information.

Computer readable transmission media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and Includes all information delivery media. The term modulated data signal means a signal in which one or more of the characteristics of the signal are set or changed to encode information in the signal. By way of example, and not limitation, computer readable transmission media includes 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, and the computer 1102 includes a processing device 1104, a system memory 1106, and a system bus 1108. do. System bus 1108 connects system components, including, but not limited to, system memory 1106 to processing device 1104. The processing device 1104 can be any of a variety of commercial processors. Dual processor and other multiprocessor architectures may also be used as the processing unit 1104.

The system bus 1108 can be any of several types of bus structures that can be further interconnected to a memory bus, peripheral bus, and 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 a non-volatile memory 1110 such as ROM, EPROM, EEPROM, etc., and this BIOS is basic to help transfer information between components in the computer 1102 at the same time as during startup. Contains routines. The RAM 1112 may also include high-speed RAM, such as static RAM for caching data.

Computer 1102 also has an internal hard disk drive (HDD) 1114 (eg, 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 (eg, for reading from or writing to removable diskette 1118), and optical disk drive 1120 (eg, CD-ROM Disc 1122 for reading or reading from or writing to other high-capacity optical media such as a DVD). The hard disk drive 1114, the magnetic disk drive 1116, and the optical disk drive 1120 are respectively connected to the system bus 1108 by the hard disk drive interface 1124, the magnetic disk drive interface 1126, and the optical drive interface 1128. ). The interface 1124 for implementing an external drive includes, for example, at least one of USB (Universal Serial Bus) and IEEE 1394 interface technology, or both.

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 above description of computer readable storage media refers to HDDs, removable magnetic disks, and removable optical media such as CDs or DVDs, those of ordinary skill in the art can use a zip drive, magnetic cassette, flash memory card, cartridge, It will be appreciated that other types of storage media readable by computers, etc., may also be used in the exemplary operating environment and that any such media may include computer-executable instructions for performing the methods of the present disclosure. .

A number of program modules may be stored in the drive and RAM 1112, including the operating system 1130, one or more application programs 1132, other program modules 1134, and program data 1136. 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 can be implemented in various commercially available operating systems or combinations of operating systems.

The user may input commands and information to the computer 1102 through one or more wired/wireless input devices, for example, pointing devices 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, etc. These and other input devices are often connected to the processing unit 1104 through an input device interface 1142 connected to the system bus 1108, but the parallel port, IEEE 1394 serial port, game port, USB port, IR interface, And other interfaces.

The 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, and the like.

The computer 1102 can 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 conventional network node, generally for computer 1102. It includes many or all of the described components, but for simplicity, only the memory storage device 1150 is shown. The illustrated logical connections include wired/wireless connections to a local area network (LAN) 1152 and/or a larger network, such as a wide area network (WAN) 1154. Such LAN and WAN networking environments are common in offices and companies, and facilitate enterprise-wide computer networks such as intranets, all of which can be connected to computer networks around the world, such as 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. The adapter 1156 can facilitate wired or wireless communication to the LAN 1152, which also includes a wireless access point installed therein to communicate with the wireless adapter 1156. When used in a WAN networking environment, the computer 1102 may include a modem 1158, connect to a communication server on the WAN 1154, or otherwise establish communication over the WAN 1154, such as through the Internet. Have a means The modem 1158, which may be an internal or external and 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 illustrated network connection is exemplary and other means of establishing a communication link between computers can be used.

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

Wi-Fi (Wireless Fidelity) enables a connection to the Internet or the like without a wired connection. Wi-Fi is a wireless technology such as a cell phone that allows a computer, for example, to send and receive data indoors and outdoors, ie anywhere within the base station's coverage area. 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 radio 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.

Those of ordinary skill in the art of the present disclosure may use various examples of logical blocks, modules, processors, means, circuits and algorithm steps described in connection with the embodiments disclosed herein in electronic hardware, (convenience For the sake of understanding, it may be implemented by various forms of program or design code (referred to herein as “software”) or a combination of both. 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. Those skilled in the art of the present disclosure may implement the functions described in various ways for each particular application, but such implementation decisions should not be interpreted as falling outside the scope of the present disclosure.

Various embodiments presented herein can be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "manufactured article" includes a computer program, carrier, or media accessible from any computer-readable device. For example, computer-readable storage media include magnetic storage devices (eg, hard disks, floppy disks, magnetic strips, etc.), optical disks (eg, CDs, DVDs, etc.), smart cards, and flashes. Memory devices (eg, EEPROMs, cards, sticks, key drives, etc.), but are not limited to these. The term “machine-readable medium” includes, but is not limited to, wireless channels and various other media capable of storing, retaining, and/or transferring command(s) and/or data.

It is understood that the specific order or hierarchy of steps in the processes presented is an example of exemplary approaches. Based on design priorities, it is understood that within the scope of the present disclosure, a specific order or hierarchy of steps in the processes may be rearranged. The accompanying 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.

Descriptions of the presented embodiments are 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 skilled in the art of the present disclosure, and the general principles defined herein can be applied to other embodiments without departing from the scope of the present disclosure. Thus, the present disclosure should not be limited to the embodiments presented herein, but should be interpreted in the broadest scope consistent with the principles and novel features presented herein.

Claims (24)

A computer program stored on a computer-readable storage medium, wherein the computer program, when executed by one or more processors, performs a method for trading items, 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 accommodating space having an address in the blockchain network; And
Allowing the first item moved to the temporary item accommodating space to be subject to an item transaction;
Containing,
A computer program stored on a computer readable storage medium. According to claim 1,
The method is:
In response to determining to move the first item to the temporary item accommodating space, generating a smart contract operable on the blockchain network to execute the transaction of the first item on the blockchain network. step;
Further comprising,
A computer program stored on a computer readable storage medium. According to claim 2,
The smart contract is:
A first sub-contract that moves the first item to the temporary item accommodating space for item trading, while ensuring that ownership of the first item belongs to the first user;
Containing,
A computer program stored on a computer readable storage medium. The method of claim 3,
When the first item is moved to the temporary item receiving space, the first item is changed to an unusable state in the game,
A computer program stored on a computer readable storage medium. According to claim 2,
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, determines whether the transaction condition of the first item is satisfied, and when the transaction condition of the first item is satisfied A second sub-contract that changes 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 generated based on the transaction conditions of the first item,
Transaction conditions of the first item are 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 price auction transaction, a general price designation transaction, a rental transaction, an advertisement generation transaction, and a donation generation transaction,
A computer program stored on a computer readable storage medium. According to claim 2,
The smart contract is:
When the ownership of the first item is changed from the first user to the second user who wants to purchase the first item, the first from a second externally owned account (EOA) associated with the second user A third sub-contract that generates a transaction on the blockchain network to deliver at least a portion of the transaction cost of the first item to a first externally owned account associated with the user;
Containing,
A computer program stored on a computer readable storage medium. According to claim 2,
The smart contract is:
When the first user cancels the sale of the first item or transfers ownership of the first item to the second user, by moving the first item from the temporary item receiving space to another location, A fourth sub-contract that allows 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:
When a transaction including an indication that the first user cancels the sale of the first item is received, the first item is a blockchain associated with the first user from the blockchain network address for the temporary item accommodating space. Generate a transaction to move to a network address,
A computer program stored on a computer readable storage medium. According to claim 2,
The smart contract is:
When ownership of the first item is transferred to the second user, a transaction for transferring at least a portion of the sales amount of the first item to a predetermined externally owned account for receiving a donation is generated on the blockchain network. 5 sub contracts;
It includes,
When the transfer is completed to a 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. According to claim 2,
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 a contract account on the blockchain network, a smart contract for performing a transaction for a 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,
In response to a transaction involving a transaction request for the first item, originating from an externally owned account associated with a second user who wishes to purchase the first item or associated with a game server, the first item stored in the contract account The smart contract to perform the transaction of is called,
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 trading; And
A hash value for the byte code of the smart contract for the item transaction;
It includes,
The address of the contract account is 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,
A computer program stored on a computer readable storage medium. According to claim 2,
Distributing the generated smart contract in a block to distribute it to a blockchain network;
Further comprising,
Blocks distributed to the blockchain network include: smart contracts for item trading 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. According to claim 1,
In response to determining to move the first item to a temporary item accommodating space for item trading, the temporary using a private key associated with at least one of the first user, the item exchange server, and the game server. Generating a first transaction for moving the first item to a blockchain address associated with the item accommodating 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 for the first item and blockchain address information associated with the temporary item accommodating 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, item exchange server, and game server;
Calling the 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 the first user and the second user is recorded in the blockchain network, a first user from a temporary item storage space managed by a game server managing the first item in a game related to the first item Deciding to move from the inventory;
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, item exchange server, and game server; And
Calling the smart contract included in the first transaction by issuing the second transaction to the blockchain network;
Further comprising,
As the smart contract is called, a transaction for transferring the cost associated with the transaction of the first item from the second user's externally owned account to the first user's externally owned account, and the above on the blockchain network. A transaction is generated to move the first item from a temporary item accommodating space to an externally owned account associated with the second user or game server,
A computer program stored on a computer readable storage medium. According to claim 1,
The step of allowing the first item moved to the temporary item accommodating space to be subject to an 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 receiving space; And
Allowing at least one of a game server and an item exchange server associated with the first item to allow users to confirm that the first item is subject to a transaction;
Containing,
A computer program stored on a computer readable storage medium. According to 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. According to claim 1,
The step of allowing the first item moved to the temporary item accommodating space to be subject to an item transaction is:
In response to determining to move the first item to a temporary item accommodating space having an address in the blockchain network, the game server manages the first item from the inventory of the first user on the game associated with the first item. Allowing the in-game users to confirm that the first item is subject to an 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 trading,
A transceiver for receiving a transaction request for a first item playable in the game from the first user; And
It is decided to move the first item to the item storage space in the game server, determine to move the first item to a temporary item storage space having an address in the blockchain network, and move to the temporary item storage space A processor that allows the first item to be subject to an item transaction;
Containing,
Game server. As an item exchange server,
Receiving a transaction request for a first item playable in the game from a first user, and sending a signal to the game server to allow the first item to be moved to the item storage space in the game server Transceiver; And
In order to move the first item to a temporary item accommodating 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 accommodating space is the target of the item transaction. A processor that decides to transmit information related to the transaction to a game server to allow this;
Containing,
Item exchange server. As a computing device constituting the blockchain network,
Processor; And
A memory storing computer programs executable by the processor;
It includes,
The processor:
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;
Include the first transaction in a first block generated according to a consensus algorithm;
Configured to allow the first item to be subject to an item transaction by moving the first item to a temporary item accommodating space having an address in the blockchain network based on the smart contract included in the first transaction ,
Computing devices that make up the blockchain network.

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