JP2020129752A - Program, information processing apparatus, and information processing method - Google Patents

Abstract

To provide a program, an information processing apparatus, and an information processing method for realizing transactions between users more simply and safely.SOLUTION: A program causes an information processing terminal to execute a step of creating transaction information for moving a predetermined virtual asset to a transaction partner, a step of receiving certification information indicating that the transaction partner from another terminal via wireless communication means when the information processing terminal and the other terminal approach within a predetermined distance, a step of confirming whether the other terminal is a terminal owned by the transaction partner on the basis of the certification information, and a step of electronically signing the transaction information when it is confirmed that the other terminal is a terminal owned by the transaction partner.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a program, an information processing device, and an information processing method.

In recent years, merchandise transactions between individuals using the Internet and communication lines have been carried out. For example, a seller registers an item on a predetermined transaction platform and puts up an item for sale, and a purchaser also makes a purchase application for an item put up on a predetermined transaction platform. After that, the seller and the purchaser generally communicate with each other to pay money and send and receive goods.

Until now, the delivery of goods was generally entrusted to the delivery by a delivery company whose business is to transport in a wide area, but in recent years, the seller and the purchaser have met directly and handed them. It is becoming more common to trade with. By carrying out transactions by hand in this way, transactions for items for which the shipping and handling fees for the successful bid amount are not suitable, large items for which delivery is not suitable, or items for which preparation for delivery is troublesome become more active. For example, Patent Document 1 describes a means for activating such a transaction by handing.

JP 2017-134767

In such a transaction between individuals, mutual trust between the seller and the purchaser is important. For example, the purchaser may consider that one of the risks is that the buyer cannot accept the goods due to the betrayal of the seller despite paying the consideration. Further, it is considered as one risk that some sellers cannot receive the price due to the betrayal of the purchaser despite the delivery of the goods.

When sending and receiving goods by mail, it is possible to use the escrow system provided by the trading platform as a means to avoid these risks. However, the conventional escrow system goes through a relatively complicated procedure of depositing, delivering, confirming arrival of goods, and depositing. Therefore, it is hard to say that the conventional escrow system is suitable for the case where the seller and the buyer meet and the transaction is carried out by hand. Therefore, in the case where the seller and the purchaser meet and make a transaction, a simpler and safer means for realizing a transaction is desired.

Therefore, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a program, an information processing device, and an information processing method for more easily and safely realizing transactions between users.

A program according to an embodiment of the present disclosure includes a step of creating transaction information for moving a predetermined virtual asset to a trading partner in an information processing terminal, and a case where the information processing terminal and another terminal approach within a predetermined distance. A step of receiving, from the other terminal, proof information indicating that the trading partner is via the wireless communication means, and the terminal owned by the trading partner by the other terminal based on the proof information. And a step of digitally signing the transaction information when the other terminal is confirmed to be a terminal owned by the trading partner.

FIG. 1 shows a configuration of a transaction system 1 according to one aspect of the embodiment. FIG. 2 shows an example of the hardware configuration of the information processing device according to the present disclosure. FIG. 3 is a diagram illustrating an outline of the processing according to the first embodiment. FIG. 4 shows an example of a block diagram showing a functional configuration of the terminal 120 according to the first embodiment. FIG. 5 shows an example of the data structure of the first transaction information stored in the transaction information DB 332. FIG. 6 shows an example of a block chain data structure stored in the transaction information DB 332. FIG. 7: shows an example of the sequence diagram which shows the process which the trading system 1 in 1st Embodiment performs. FIG. 8 shows an example of a flowchart of processing in the terminal 120 according to the first embodiment. FIG. 9 shows an example of a sequence diagram showing a process performed by the trading system 1 in the second embodiment. FIG. 10 shows an example of a sequence diagram showing a process performed by the trading system 1 in the third embodiment.

<Legal compliance>
The disclosures described herein, when implemented, are performed in compliance with the laws of each country in which the disclosure is implemented. In addition, the disclosure described herein is implemented with all changes, substitutions, variations, alterations, and modifications that can be made by those skilled in the art, in order to comply with the laws of each country.

Modes for carrying out a program, an information processing apparatus, and an information processing method according to the present disclosure will be described with reference to the drawings.

<System configuration>
FIG. 1 shows a configuration of a transaction system 1 for effectively implementing an information processing method according to an embodiment of the present disclosure. As disclosed in FIG. 1, in the transaction system 1, the servers 110A and 110B are connected to the terminals 120A, 120B, and 120C via the network 130. The servers 110A and 110B, and the terminals 120A, 120B, and 120C form a distributed ledger (hereinafter, also referred to as “block chain”). In the present disclosure, the block chain is described as a public type configuration without a central administrator, but the present invention is not limited to this, and may be a private type or a consortium type.

In the present disclosure, if it is not necessary to distinguish between the server 110A and the server 110B, the server 110A and the server 110B may be expressed as the server 110, respectively.

In the present disclosure, if it is not necessary to distinguish the terminal 120A, the terminal 120B, and the terminal 120C from each other, the terminal 120A, the terminal 120B, and the terminal 120C may be expressed as the terminal 120, respectively.

In the present disclosure, when it is not necessary to distinguish between the server 110 and the terminal 120, the server 110 and the terminal 120 may be expressed as the information processing device 200, respectively. The number of information processing devices 200 connected to the network 130 is not limited.

The server 110 provides a predetermined service to the terminal 120 used by the user via the network 130. The predetermined service includes, but is not limited to, a payment service, a financial service, an electronic commerce service, an SNS (Social Networking Service) typified by instant messenger, and a content providing service such as music/video/book. When the user uses a predetermined service via the terminal 120, the server 110 can provide the predetermined service to one or more terminals 120.

In the present disclosure, the settlement service means a service that allows one or more users to exchange money or money equivalents. By way of example and not limitation, one-dimensional code (bar code, etc.), two-dimensional code (QR code (registered trademark), etc.) (hereinafter, one-dimensional code and two-dimensional code are collectively referred to as “two-dimensional code, etc.” ), near field communication (NFC (Near Field Communication), BLE (Bluetooth (registered trademark) Low Energy), Wi-Fi (registered trademark), ultrasonic communication, infrared communication, etc.) including. In addition, the fact that the terminal 120 of the user (payer) who pays the price reads the two-dimensional code or the like to perform payment is referred to as “user-readable code payment” or “MPM (Merchant Presented Mode)”, and payment is performed. The terminal 120 of the user who performs the operation displays the two-dimensional code or the like, and the displayed two-dimensional code or the like is read by the terminal 120 of the user (seller, invoicer) on the store side or the like who bills for the payment. This is referred to as “store-reading code settlement” or “CPM (Consumer Presented Mode)”. The MPM and CPM may be dynamic or static.

If necessary, the terminal used by the user X is expressed as a terminal 120X, and the user information in a predetermined service associated with the user X or the terminal 120X is expressed as a user information X. Note that the user information is user information associated with an account used by the user in a predetermined service. The user information is, for example and without limitation, the user's name, the user's icon image, the user's age, the user's gender, the user's address, the user's hobby, which is input by the user or given by a predetermined service. Information such as tastes, user identifiers, and other information associated with the user, electronic value (electronic money) balance information associated with the user, and credit card information (credit card number, etc.) associated with the user. Any one of them or a combination thereof may be used.

The network 130 has a role of connecting two or more information processing devices 200. The network 130 refers to a communication network that provides a connection path so that the terminal 120 can transmit and receive data after connecting to the server 110.

One or more portions of network 130 may be wired or wireless networks. The network 130 is, by way of example and not limitation, an ad hoc network, an intranet, an extranet, a virtual private network (VPN), a local area network (LAN), a wireless. LAN (Wireless LAN: WLAN), wide area network (Wide Area Network: WAN), wireless WAN (Wireless WAN: WWAN), metropolitan area network (Metropolitan Area Network: MAN), part of the Internet, public switched telephone network (Public) Switched Telephone Network: Part of PSTN, mobile phone network, ISDNs (Integrated Service Digital Networks), wireless LANs, LTE (Long Term Evolution), CDMA (Code Division Multiple Access), Bluetooth (Bluetooth (registered trademark)), satellite Communication, etc., or a combination of two or more of these may be included. Networks 130 may include one or more networks 130.

The information processing device 200 may be any information processing device as long as it can realize the functions and/or methods described in the present disclosure.

The information processing apparatus 200 includes, by way of example and not limitation, a smartphone, a mobile phone (feature phone), a computer (for example, without limitation, a desktop, laptop, tablet, etc.), a server device, a media computer platform (for example, but not limitation). , Cables, satellite set-top boxes, digital video recorders, etc.), handheld computer devices (such as, but not limited to, PDAs (Personal Digital Assistants), email clients, etc.), wearable terminals (such as, but not limited to, eyeglass devices, Including clock-type devices), other types of computers, or communication platforms.

<Hardware (HW) configuration>
The HW configuration of the information processing device 200 included in the transaction system 1 will be described with reference to FIG.

The information processing device 200 includes a processor 201, a memory 202, a storage 203, an input/output interface (input/output I/F) 204, and a communication interface (communication I/F) 205. The components of the HW of the information processing device 200 are connected to each other via the bus B as an example and not a limitation.

The information processing apparatus 200 realizes the functions and/or methods described in the present disclosure by the cooperation of the processor 201, the memory 202, the storage 203, the input/output I/F 204, and the communication I/F 205. To do.

The processor 201 executes a function and/or a method realized by a code or an instruction included in a program stored in the storage 203. The processor 201 is, by way of example and not limitation, a central processing unit (CPU), MPU (Micro Processing Unit), GPU (Graphics processing Unit), microprocessor (microprocessor), processor core (processor core), multiprocessor (multiprocessor). , ASIC (Application-Specific Integrated Circuit), FPGA (Field Programmable Gate Array), etc., and a logic circuit (hardware) formed in an integrated circuit (IC (Integrated Circuit) chip, LSI (Large Scale Integration)) or the like, Each process disclosed in each embodiment may be realized by a dedicated circuit. Further, these circuits may be realized by one or a plurality of integrated circuits, and the plurality of processes shown in each embodiment may be realized by a single integrated circuit. Further, the LSI may be referred to as VLSI, super LSI, ultra LSI, or the like depending on the degree of integration.

The memory 202 temporarily stores the program loaded from the storage 203 and provides a work area to the processor 201. The memory 202 also temporarily stores various data generated while the processor 201 executes the program. The memory 202 includes, for example and without limitation, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like.

The storage 203 stores the program. The storage 203 includes, for example and without limitation, a HDD (Hard Disk Drive), an SSD (Solid State Drive), a flash memory, and the like.

The communication I/F 205 transmits and receives various data via the network 130. The communication may be performed by wire or wireless, and any communication protocol may be used as long as mutual communication can be performed. The communication I/F 205 has a function of performing communication with another information processing device via the network 130. The communication I/F 205 transmits various data to another information processing device according to an instruction from the processor 201. Further, the communication I/F 205 receives various data transmitted from another information processing device and transfers the data to the processor 201.

The input/output I/F 204 includes an input device that inputs various operations on the information processing device 200, and an output device that outputs a processing result processed by the information processing device 200. In the input/output I/F 204, the input device and the output device may be integrated, or the input device and the output device may be separated.

The input device is realized by any of all types of devices capable of receiving an input from a user and transmitting information related to the input to the processor 201, or a combination thereof. The input device includes, by way of example and not limitation, a touch panel, a touch display, a hardware key such as a keyboard, a pointing device such as a mouse, a camera (operation input through an image), and a microphone (operation input by voice).

The output device is realized by any of all types of devices capable of outputting the processing result processed by the processor 201, or a combination thereof. When outputting the processing result as a video and/or a moving image, the output device may be any one or all of the devices capable of displaying the display data according to the display data written in the frame buffer. It is realized by combination. The output device is, for example, without limitation, a touch panel, a touch display, a monitor (as an example without limitation, a liquid crystal display, an OELD (Organic Electroluminescence Display), etc.), a head mounted display (HDM: Head Mounted Display), projection mapping, a hologram. , A device capable of displaying an image, text information and the like in the air (may be a vacuum), a speaker (voice output), a printer, and the like. Note that these output devices may be capable of displaying the display data in 3D.

The program of each embodiment of the present disclosure may be provided in a state of being stored in a computer-readable storage medium. The storage medium can store the program in a “non-transitory tangible medium”. Programs include, by way of example and not limitation, software programs and computer programs.

The storage medium is, where appropriate, one or more semiconductor-based or other integrated circuits (ICs), such as, but not limited to, field programmable gate arrays (FPGAs), application specific ICs (ASICs), etc. ), hard disk drive (HDD), hybrid hard drive (HHD), optical disk, optical disk drive (ODD), magneto-optical disk, magneto-optical drive, floppy diskette, floppy disk drive (FDD), magnetic It may include tape, solid state drive (SSD), RAM drive, secure digital card or drive, any other suitable storage medium, or any suitable combination of two or more thereof. Storage media may be volatile, non-volatile, or a combination of volatile and non-volatile, where appropriate.

Further, the program of the present disclosure may be provided to the information processing device 200 via any transmission medium (communication network, broadcast wave, or the like) capable of transmitting the program.

Each embodiment of the present disclosure can also be realized in the form of a data signal embedded in a carrier wave in which a program is embodied by electronic transmission.

It should be noted that the program of the present disclosure is implemented using a script language such as JavaScript (registered trademark) or Python, a C language, a Go language, a programming language such as Swift, Kotlin, or Java (registered trademark) by way of example and not limitation. To be done.

At least a part of the processing in the information processing device 200 may be realized by cloud computing including one or more computers.

At least part of the processing in the information processing device 200 may be performed by another information processing device. In this case, at least a part of the processing of each functional unit realized by the processor 201 may be configured to be performed by another information processing device.

<Other>
Unless explicitly stated, the configuration of the determination in the embodiment of the present disclosure is not essential, a predetermined process is operated when the determination condition is satisfied, or a predetermined process is performed when the determination condition is not satisfied. You may.

In this disclosure, the use of "or" is intended to be inclusive rather than exclusive, unless explicitly stated otherwise or indicated by context. Thus, in this disclosure, "A or B" means "A, B, or both," unless stated otherwise or indicated by context. Further, “at least one of A and B” means “A, B, or both”. Further, unless otherwise specified or indicated by context, "a", "an", or "the" shall mean "one or more." Thus, herein, "an A" or "the A" means "one or more A," unless otherwise specified or indicated by context.

This disclosure includes all changes, substitutions, variations, alterations, and modifications to the embodiments and/or examples of the present disclosure that can be made by those skilled in the art. Similarly, where appropriate, the appended claims cover all changes, substitutions, variations, alterations, and modifications to the embodiments and/or examples of this disclosure that can be made by those skilled in the art. Include. Further, the disclosure is one or more features of the embodiments and/or examples in this disclosure and one of the other embodiments and/or examples in this disclosure that can be made by those skilled in the art. Includes any combination of one or more features.

In addition, a device or system or device or system component adapted, arranged, capable, configured, usable, operable, or operable to be adapted to perform a particular function. References in the claims appended hereto are those devices, systems, or components that are so adapted, arranged, capable, configured, enabled, enabled. As long as the device, system, or component is activated, turned on, or unlocked, the device, system, or component is encompassed as long as the device, system, or component is activated, turned on, or unlocked.

Unless otherwise specified, the present disclosure may obtain consent from a user before or immediately before implementing any of the embodiments or examples. Further, the consent to be acquired may be comprehensive or may be acquired each time.

Hereinafter, an embodiment according to an example of the present disclosure will be described with reference to the drawings. However, the embodiments described below are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described below. That is, the example of the present disclosure can be variously modified and implemented without departing from the spirit thereof. Further, in the following description of the drawings, the same or similar reference numerals are given to the same or similar portions, and the drawings are schematic and do not necessarily match actual dimensions and ratios. Furthermore, the drawings may include portions having different dimensional relationships and ratios.

<Terms>
Before specifically describing the embodiments, first, terms used in the present disclosure will be described. The “virtual asset” in the present disclosure indicates a virtual currency or a tradable asset that is equivalent thereto. As a general rule, the "virtual currency" is the one stipulated in Article 2, Paragraph 5, Items 1 and 2 of the Act on Fund Settlement (Law No. 59 of 2009), or equivalent thereto. Therefore, it can be distributed as electronic data without having physical items such as banknotes and coins, and can be used as consideration for goods and services among unspecified number of people through the network. It does not necessarily mean that the manager does not necessarily exist but is traded on a specialized exchange or sales place, and can also be exchanged for a real currency such as yen, dollar or euro, but it is not limited to this. Note that the virtual asset is not limited to this, and may be information recorded on the block chain as long as the ownership can be transmitted and received between users by a transaction.

The virtual asset can be remitted from the user who owns the virtual asset to another user. Transactions of such virtual assets are managed by a distributed ledger that records transaction information of virtual assets called block chains, instead of being managed by a specific institution. This transaction information includes information regarding the transfer of the virtual asset from the transfer source to the transfer destination. The transaction information is digitally signed by an encryption key (key indicating the ownership of the virtual asset) owned by the user who owns the virtual asset that is the transfer source, and is transmitted on the blockchain network. It is recorded in the distributed ledger and treated as valid. As an example, when transaction information digitally signed by an encryption key is transmitted on the network, a blockchain node verifies the validity of the transaction information, and a plurality of verified transaction information is called a block at predetermined time intervals. Grouped together. Transaction information is recorded in the distributed ledger by adding a new block that has been put together to the end of the blockchain. That is, in the block chain, data called blocks including transaction information are arranged and managed in time series, and have a role as a ledger that records the movement of virtual assets.

When sending a virtual asset owned by a user to another user, transaction information is sent to the blockchain network. The “blockchain network” refers to a network that shares information about a blockchain configured by two or more information processing devices 200 that communicate according to a predetermined communication protocol. The block chain network is, for example, a P2P network.

Nodes participating in the blockchain network may directly share information about the blockchain with each other via the network 130. Here, as an example, the transaction information is described as being transmitted to the network 130 by broadcast communication, but the present invention is not limited to this, and may be transmitted by unicast communication or multicast communication. The transaction information broadcast to the block chain network is received by each information processing device 200 connected to the block chain network. As an example, the broadcast transaction information is stored in a block by any information processing device 200 of the information processing devices 200 that has received the transaction information. The block transmitted to the block chain network is recorded after being connected to the block finally determined after consensus formation by an algorithm such as PoW (Proof of Work) or PoS (Proof of Stake).

<First Embodiment>
The outline of the processing according to this embodiment will be described with reference to FIG. In the first embodiment, in a transaction between users, one user deposits a virtual asset corresponding to a transaction price so that it can be used when both users sign. Then, when it is detected that the user terminals involved in the transaction have come close to each other within a predetermined distance, the transaction information for moving the deposited virtual asset to the other user is electronically signed.

In the program, the information processing terminal, and the information processing method according to the first embodiment, it is confirmed that the first terminal owned by one user and the second terminal owned by the other user are within a predetermined distance. At this time, information about transaction information to be digitally signed is transmitted and received via wireless communication means. As a result, the first terminal and the second terminal can mutually recognize that they are terminals owned by a trading partner related to the transaction information.

In the following description, it is assumed that a user A who is a purchaser and a user B who is a seller perform a transaction regarding the sale and purchase of products. As an example, it is assumed that the purchaser owns the terminal 120A and the seller owns the terminal 120B. In particular, in a transaction between a purchaser and a seller, a configuration in which the price is once deposited and then remitted will be described, but the configuration of the present embodiment is not limited to this configuration.

In this transaction system 1, for example, the terminal 120A and the terminal 120B are connected via the network 130 (see FIG. 1). In the present disclosure, it is assumed that the terminal 120A is a terminal that manages the first secret key and the terminal 120B is a terminal that manages the second secret key. However, each private key does not necessarily have to be managed and used by the terminal. For example, instead of a software (desktop) wallet in which a terminal records an encryption key, a web (online) wallet in which a server records an encryption key, a hardware wallet in which a recording medium such as a USB records an encryption key, or a paper medium is an encryption A cold (paper) wallet that records the key may be used.

In the following, the encryption key will be described as a secret key used in a public key cryptosystem in which encryption is performed with a private key and decryption is performed with a public key, but the invention is not limited to this, and the same key encryption and decryption can be used. Any encryption key such as a common key of the common key cryptosystem to be used may be used.

<Effects of First Embodiment>
According to the first embodiment, when the terminals involved in a specific transaction come close to each other within a predetermined distance, the electronic signature for the transaction information is executed, so that the transaction between users can be realized more easily and safely. .. For example, when a terminal detects the approach of a terminal involved in a specific transaction and digitally signs the corresponding transaction information, the user searches for the transaction information corresponding to the specific transaction and digitally signs it. You can save time. In addition, by configuring the terminal to digitally sign the product under a predetermined condition, when the product is exchanged between traders, the trader who is the payment source of the virtual asset does not sign the digital signature, and the product can be taken away. Can reduce the risk of

<Functional configuration of the first embodiment>
The functional configuration of the terminal 120 will be described with reference to FIGS. 4 to 6. Each functional unit disclosed in FIGS. 4 to 6 is realized by cooperation of the processor 201, the memory 202, the storage 203, the input/output I/F 204, and the communication I/F 205 included in the information processing apparatus 200. ..

(1) Functional Configuration of Terminal 120 FIG. 4 shows an example of a block diagram showing a functional configuration of the terminal 120 according to the first embodiment. The terminal 120 is an example of an information processing terminal used for trading virtual assets in the trading system 1, and is an example of an information processing terminal used by a purchaser or a seller. The terminal 120 includes an input/output I/F 311, a communication I/F 312, a storage unit 320, and a control unit 330.

The input/output I/F 311 can be realized by using the input/output I/F 204, for example. The communication I/F 312 can be realized by using the communication I/F 205, for example. The storage unit 320 can be realized by using the memory 202 and/or the storage 203, for example. The control unit 330 can be realized by, for example, the processor 201 reading out and executing a program stored in the storage unit 320.

The storage unit 320 also stores a program 321 executed by the terminal 120 according to the present embodiment, and a transaction information DB 332 that manages transaction information transmitted to the block chain network.

The program 321 detects, for example, whether or not the terminal approaching the terminal 120 is the terminal of the trading partner in the predetermined transaction information, and if it is the terminal of the trading partner, electronically signs the predetermined transaction information. It is a program for. The program 321 may be recorded in a computer-readable recording medium, or may be installed in the computer from this recording medium.

The transaction information DB 332 manages information about transaction information transmitted to the block chain network, for example.

The “transaction information” in the present disclosure describes the conditions under which the user who created the transaction information makes the virtual asset available to any user.

Further, the transaction information DB 332 may manage transaction information transmitted to the block chain network and not approved.

The data structure of transaction information will be described with reference to FIG. FIG. 5 shows the transaction information recorded in the transaction information DB 332 when the transaction is completed between the user A and the user B and the price is paid from the user A to the user B in the system according to the present embodiment. Shows some. In FIG. 5, transaction information T01 is transaction information for the purchaser to deposit the transaction price, and transaction information T02 is transaction information for the seller to use the deposited transaction price.

Transaction information includes inputs and outputs. For the output, for example, the remittance amount and the unlocking condition are designated. The unlocking condition is a condition required when the virtual asset to be remitted this time is used for another transaction information. An output that has not been referred to as an input of another transaction information among outputs created by one transaction information is also called UTXO.

In the input of the transaction information, information indicating the UTXO used this time (for example, a pointer or the like) and the release condition of the UTXO are designated. The release condition is a condition for using the UTXO, and corresponds to the unlocking condition specified in the output of the transaction information to which the UTXO is remitted.

Here, in the transaction information T01, as input, information that refers to the UTXO that the purchaser received the virtual asset to be retransmitted this time, and the release condition corresponding to the unlocking condition designated by the UTXO (in this example, the purchaser's signature and Public key) is specified. In addition, any two of the hash value of the public key of the seller, the purchaser, and the administrator as the unlocking condition may be satisfied in the output as the remittance amount, and the unlocking condition. It is specified.

When the hash value of the public key is specified as the unlocking condition, the release condition is the signature of the public key and the private key corresponding to the public key. The method of describing the unlocking condition is not limited to the example of FIG. 5, and may be simplified by using a script or the like if the same condition is shown.

The transaction information T02 includes a pointer to the output (UTXO) of the transaction information T01 as an input, and a release condition corresponding to the unlocking condition designated by the UTXO (in this example, the seller's signature/public key and purchase). Person's signature/public key) is set. Also, the output specifies the amount of money you want to remit (typically the amount minus the fee) and the unlocking conditions (typically the hash value of the seller's public key) out of the deposited money. Has been done. The unlocking condition is not limited to that shown in FIG. 20, and may be any condition specified by the seller. The transaction information T02 may include a plurality of outputs, and different unlocking conditions may be designated for each output.

As will be described later in detail, the release condition of the transaction information T02 is set to two types of the signature/public key of the seller, the signature/public key of the purchaser, and the signature/public key of the administrator. However, it is not limited to the example of FIG.

Next, FIG. 6 schematically shows a part of the data structure of the block chain stored in the transaction information DB 332. FIG. 6 is a diagram showing the structure of the N+1th block among the blocks arranged in chronological order.

The “header” of the block stores, for example, the digest, time stamp, target, and nonce of the Nth block.

The "digest of the Nth block" stores, for example, identification information for uniquely identifying the Nth block by the server 110 and the terminal 120 on the block chain network. As the digest of the Nth block, for example, a hash value of the block can be used.

The "time stamp" stores information about the time stamp or block number that the miner gives when a block is created.

“Target” and “nonce” are values used when mining is performed using the PoW (Proof of Work) technique, for example. The “target” is a value related to the difficulty level of mining. "Nance" is any value created by a miner when creating a block.

The mining will be specifically described. In mining, the miner finds a nonce in which the digest (hash value) of the N+1th block is equal to or less than the target value, and when an appropriate nonce is found, stores the found nonce to create the N+1th block. The blockchain node that performs mining repeatedly calculates (mining) the digest of the block header while changing the value of the nonce for the purpose of discovering this appropriate nonce. Since the probability of the block header digest containing an arbitrary nonce being less than the target is extremely small, mining costs too much.

Note that mining is not limited to the configuration using PoW technology. For example, each information processing device 200 may be configured to add the block to the end of the block chain regardless of whether the header of the created block is equal to or less than the target value. In this case, the block stored in the transaction information D332 may not include the target and the nonce. Further, when the block chain is a private type or a consortium type, the mining may not be performed.

A plurality of transaction information is stored in the "body" of the block. The first transaction information stored in the block has the same time stamp data.

The transaction information and the structure of the block are not limited to the examples of FIGS. 5 and 6, and may have any structure.

Next, returning to FIG. 4, the control unit 330 will be described. The control unit 330 includes a transaction information creation unit 331, an approach detection unit 332, and an electronic signature unit 333.

The input/output I/F 321 displays a predetermined screen, receives a user operation using a button displayed on the screen of the terminal 120, a touch panel of the terminal 120, or the like, and outputs information regarding the operation to the control unit 330. To do.

The communication I/F 312 has a function as a receiving unit that receives information regarding transaction information from the block chain network. The communication I/F 312 also has a function as a receiving unit that receives a notification for confirming whether or not the terminal corresponds to the specific transaction information from another terminal via the wireless communication means.

The communication I/F 312 has a function as a transmission unit that transmits transaction information and the like to the block chain network. The communication I/F 312 also has a function as a transmission unit that transmits a notification indicating that the terminal corresponds to the specific transaction information to another terminal via the wireless communication means.

These functional configurations are realized by the processor 201 reading and executing the program 321 stored in the storage unit 320. Further, the functional configuration realized by the terminal 120 may be appropriately omitted, replaced, or added depending on the embodiment or the example.

The transaction information creation unit 331 has a function of creating transaction information for moving a virtual asset. For example, the transaction information creation unit 331 can create transaction information for depositing the price, and transaction information for sending the deposited price to a trading partner (seller). Furthermore, the transaction information creation unit 331 also has a function of acquiring a public key necessary for creating transaction information.

The approach detection unit 332 has a function of detecting the approach of a terminal of a trading partner for a predetermined transaction via wireless communication means. Examples of the "wireless communication means" include those used for so-called short-range wireless communication. Examples thereof include NFC (Near Field Communication), BLE (Bluetooth (registered trademark) Low Energy), ZigBee, Wi-Fi (registered trademark), ultrasonic communication, and infrared communication.

The approach detection unit 332 determines whether the information received from the terminal located within a predetermined range from the terminal itself has received the certification information. The certification information is information indicating that the transaction information creation unit 331 identifies the transaction partner. More specifically, the certification information is, for example, information encrypted by the secret key of the user who transmits the certification information. Such information can be created only by the person who owns the private key. Further, a person who can know the public key corresponding to the private key can easily confirm that the information is created by the person who owns the private key.

When the received information includes certification information, the approach detection unit 332 determines whether the certification information is the transaction partner specified by the transaction information creation unit 331. In the case of the identified trading partner, the approach detection unit 332 instructs the electronic signature unit 333 to electronically sign the transaction information regarding the specified trading partner (for example, the transaction information T02 in FIG. 5). To do. At this time, the approach detection unit 332 transmits the transaction information T02 and requests the signature (the terminal 120B in the example of FIG. 5) that has received the certification information.

The approach detection unit 332 may transmit the certification information of the owner of the terminal 120 to the terminal that has entered the communication range of the wireless communication unit. In this case, not only is it possible to detect that the trading partner's terminal 120 is within the communication range of the terminal 120's wireless communication means, but also its own terminal (terminal 120) is within the communication range of the trading partner's terminal's wireless communication means. Can be notified.

Furthermore, the approach detection unit 332 may have a function of detecting the distance between the own terminal and another terminal via a wireless communication unit. For example, it is possible to detect the distance between the own terminal and another terminal by calculating the signal attenuation amount from the transmission intensity and the reception intensity and calculating the distance backward from the relational expression established between the square of the distance and the attenuation amount. it can. The wireless communication means suitable for such detection is not particularly limited, but Bluetooth may be mentioned. The approach detection unit 332 can instruct the display unit of the input/output I/F 311 to display the distance between the own terminal and another terminal.

Accordingly, even when there are a plurality of users who have other terminals around the user who has the terminal 120, it is possible to more easily specify the trading partner.

Further, when the approach detection unit 332 has a function of detecting the distance between the own terminal and another terminal via the wireless communication means, when the approach detection unit 332 detects that the distance between the terminals becomes equal to or less than a certain value, The electronic signature unit 333 may be instructed to electronically sign specific transaction information. The fixed distance is not particularly limited, but may be 1 m or less and 2 m or less, which is a range in which articles can be handed.

As a result, when the terminal 120 and the terminal of the trading partner come close to the communication range of the wireless communication means, and before the actual transaction of the article is performed, the electronic signature unit electronically signs the transaction information. Can be avoided. Therefore, the certainty of the transaction is further improved.

The digital signature unit 333 has a function of digitally signing specific transaction information with a secret key managed by the terminal 120 in response to an instruction from the approach detection unit 332.

Thereby, from the perspective of the purchaser, the terminal detects the approach of the terminal involved in a specific transaction and electronically signs the corresponding transaction information, so that the user searches for the transaction information corresponding to the specific transaction, On the other hand, it is possible to save the trouble of making an electronic signature.

Also, from the viewpoint of the seller, by configuring the terminal to perform an electronic signature under a predetermined condition, when a product is exchanged between traders, the electronic signature can be obtained without requiring the operation between the traders. Since the transaction is performed, the transaction of the virtual asset is executed even if the transaction source of the virtual asset is not digitally signed, and it is possible to reduce the risk that the commodity is taken away.

Further, the electronic signature unit 333 may cause the display unit of the input/output I/F 311 of the terminal 120 to display a confirmation screen for confirming that the electronic signature is performed with the first secret key on the display device. The confirmation screen displayed at this time may include a button for deciding to make an electronic signature and a button for deciding not to make an electronic signature. The confirmation screen to be displayed may be displayed on the display unit of the input/output I/F 311 by pop-up.

Accordingly, when the terminals 120A and 120B approach the communication range of the wireless communication means, it is possible to confirm with the trader about the execution of the electronic signature. This is an effective means for a trader who wants to confirm the execution of the electronic signature when trading goods.

<Trading system operation processing of the first embodiment>
A processing sequence according to the first embodiment will be described with reference to FIGS. 7 to 8. Here, it is assumed that the purchaser (user A) who owns the terminal 120A and the seller who has the terminal 120B make a transaction. FIG. 7 shows an example of a processing sequence of the transaction system 1 in the first embodiment, and FIG. 8 shows an example of a processing flow of the information processing terminal (terminal 120A) in the first embodiment. Note that the processing procedure described below is merely an example, and each processing may be modified as much as possible within the scope of the technical idea of the present disclosure, and omission of steps, replacement, and addition may be appropriately performed. is there.

(Process to deposit the price)
In step S701 shown in FIG. 7, the transaction information creation unit 331 of the terminal 120A obtains the public key from the user A and the user B when creating the transaction information for depositing the price according to the user operation. The public key acquired from the user A and the user B may be the public key that the user A and the user B normally use, or the public key created by the user A and the user B for this transaction.

In step S702, the transaction information creation unit 331 of the terminal 120A uses the acquired public key in accordance with the user operation to deposit the transaction information (transaction information T01 in FIG. 5, referred to as first transaction information here). To create. Next, the electronic signature unit 333 instructs the communication I/F 312 to electronically sign the first transaction information with the first secret key and send it to the block chain network.

In step S703, the first transaction information is approved and recorded on the blockchain. Then, in step S704, the receiving unit of the terminal 120B receives the information on the first transaction information from the block chain network.

(Process to create transaction information to move the price)
In step S705, the transaction information creation unit 331 of the terminal 120A creates transaction information (transaction information T02 in FIG. 5, also referred to as second transaction information here) for sending the deposited virtual asset to the seller. At this stage, the transaction information creation unit 331 does not allow the electronic signature unit 333 to sign the input of the transaction information T02.

In step S706, the transaction information creation unit 331 of the terminal 120A instructs the communication I/F 312 to transmit the unsigned second transaction information to the terminal 120B.

Note that the transaction information creation unit 331 may create transaction information (also referred to as third transaction information herein) that returns the deposited virtual asset to the purchaser, together with the second transaction information (transaction information T02). preferable. Specifically, the third transaction information includes, as an output, the amount of money to be remitted (typically, the amount obtained by subtracting the fee from the deposited amount) and the unlocking condition (typically, the purchaser). The public key hash value of) and is specified. The unlocking condition is not limited to this, and may be any specified by the purchaser. Further, a pointer to the output (UTXO) of the first transaction information (transaction information T01) is designated as the input of the third transaction information. Further, the input requires the signature of any two of the purchaser, seller, and administrator in order to release the UTXO, but at this time, only the purchaser has signed the signature. If the seller takes away the merchandise or if the merchandise is defective, User A asks the administrator to sign the input of the third transaction information to recover the price. You can

(Processing S1 for detecting that the terminal 120A approaches the terminal 120B)
In step S707, the approach detection unit 332 of the terminal 120B generates (encrypts) the proof information (here, encrypted) with the secret key of the user B to the terminal within the communication range of the wireless communication unit via the wireless communication unit. Also referred to as the second certification information) to the transmitting unit.

In step S708, the approach detection unit 332 of the terminal 120A verifies the second certification information and confirms whether the owner of the terminal 120B is the current trading partner. Specifically, the approach detection unit 332 verifies whether the second certification information can be decrypted with the public key specified in the output of the second transaction information.

In step S709, the approach detection unit 332 of the terminal 120A may transmit the confirmation result to the terminal 120B when it is confirmed that the terminal 120B is the other party (seller) in the second transaction information. Accordingly, the terminal 120B can also confirm that the terminal 120A is the other party (purchaser) in the second transaction information (step S710).

(Processing S2 for detecting that the terminal 120B approaches the terminal 120A)
In step S711, the approach detection unit 332 of the terminal 120A uses the wireless communication means to generate authentication (encryption) with the secret key of the user A for the terminals within the communication range of the wireless communication means (here, here). (Also referred to as the first certification information) to the transmitting unit.

In step S712, the approach detection unit 332 of the terminal 120B verifies the first certification information and confirms whether the owner of the terminal 120A is the current trading partner. Specifically, the approach detection unit 332 verifies whether the first certification information can be decrypted with the public key specified by the input of the first transaction information.

In step S713, the approach detection unit 332 of the terminal 120B may transmit the confirmation result to the terminal 120A when it is confirmed that the terminal 120A is the other party (purchaser) in the second transaction information. Accordingly, the terminal 120A can also confirm that the terminal 120B is the other party (seller) in the second transaction information (step S714).

When the terminal 120A confirms that the terminal 120B is the other party (seller) in the second transaction information in step S714, the electronic signature unit 333 of the terminal 120A electronically signs the second transaction information. be able to.

It should be noted that step S707 or S711 is repeated until the terminals 120A and 120B come close to each other within the communication range of the wireless communication unit, or until the second transaction information is digitally signed after the close (S801). In addition, the processes S1 and S2 may be executed either alone or both.

(Process of digitally signing second transaction information)
In step S715, the digital signature unit 333 of the terminal 120B digitally signs the second transaction information. Next, in step S716, the terminal 120B transmits, to the terminal 120A, a signature request that requests the terminal 120A to electronically sign the second transaction information. In addition, when the approach detection unit 332 of the terminal 120B confirms that the terminal 120A is the other party (purchaser) in the second transaction information, the electronic signature unit of the terminal 120B performs an electronic signature on the second transaction information. The transmission unit may be instructed to transmit the signature request for requesting the request to the terminal 120A. Note that step S716 is not an essential process.

In step S717, the approach detection unit 332 of the terminal 120A displays a confirmation screen for confirming that the electronic signature is made on the display device when the terminal 120B can confirm that the other party (seller) in the second transaction information. The input/output I/F is instructed to do so. The approach detection unit 332 of the terminal 120A may display a confirmation screen on the display device when the signature request is received from the terminal 120B. By the user A and the user B signing the second transaction information, the unlocking condition specified by the output of the first transaction information can be satisfied. Thereby, the transaction price becomes freely available to the user B.

In step S718, the electronic signature unit 333 of the terminal 120A instructs the communication I/F 312 to electronically sign the second transaction information and transmit it to the block chain network. Thereby, the remittance based on the second transaction information is executed (step S719).

(Process of digitally signing via server 110)
In addition to or instead of the above, when the terminal 120A and the terminal 120B approach each other within a predetermined distance, the server 110 electronically signs the transaction information for transmitting the virtual asset to the user of the terminal 120B, and/or The terminal 120A may be requested to make an electronic signature.

In this case, the server 110 has a function corresponding to the approach detection unit 332 and the electronic signature unit 333 described above. Specifically, the approach detection unit of the server 110 determines whether the terminal 120A and the terminal 120B have approached within a predetermined distance. At this time, the server 110 preferably receives the certification information of the terminals 120A and 120B. Furthermore, the approach detection unit of the server 110 verifies from the received certification information whether the user of the terminal 120A or the terminal 120B is a legitimate user in this transaction. When it is determined that the transaction information is valid, the electronic signature unit of the server 110 electronically signs the transaction information. It should be noted that, instead of the server 110 giving an electronic signature, a request for requesting an electronic signature may be sent to the terminal 120A. The signature request includes a request to display a confirmation screen confirming that the electronic signature is to be performed on the display device of the terminal 120A.

Thereby, even if the purchaser does not make an electronic signature, the electronic signature unit of the server 110 can make an electronic signature on the transaction information.

<<Variation 1>>
In the first embodiment, an example in which the administrator exists so that the purchaser can recover the deposited price if the seller takes away the product or if the product is defective, has been described. Not limited. When there is no manager, the unlock condition for the output of the transaction information (transaction information T01 in FIG. 5) for depositing the price is the hash of the purchaser's public key and the hash of the seller's public key. It is specified.

<Second Embodiment>
The second embodiment is an embodiment in which the goods are delivered by delivery. More specifically, in the second embodiment, a virtual asset corresponding to a delivery fee is deposited, and the delivery terminal (terminal 120C) and the seller terminal (terminal 120A) are within a predetermined distance. An embodiment in which, when it is detected that the distributor terminal (terminal 120C) and the purchaser terminal (terminal 120B) are within a predetermined distance, the transaction information for moving the deposited virtual asset to the distributor is electronically signed. Is.

In this transaction system 1, for example, the terminal 120A, the terminal 120B, and the terminal 120C are connected via the network 130.

<Effects of Second Embodiment>
According to the second embodiment, the terminal (terminal 120C) of the distributor (user C) is both the terminal (terminal 120A) of the purchaser (user A) and the terminal (terminal 120B) of the seller (user B). When approaching within a predetermined distance, the seller and the purchaser can sign the transaction information for sending the deposited virtual asset to the delivery person. Therefore, for example, the delivery person cannot receive the delivery charge based on the second transaction information unless the delivery person receives the article from the seller and delivers the article to the purchaser. Therefore, it is expected that the shipper will have a reasonable incentive to go to the seller to pick up and deliver it to the buyer.

<Functional configuration of the second embodiment>
The functional configuration of the second embodiment will be described below. In the following description, the same reference numerals will be given to the same functional configurations as those in the first embodiment, and description thereof will be omitted. The description of the same operation and effect as those of the first embodiment will be omitted. Hereinafter, differences from the first embodiment will be mainly described.

Each of the terminals 120</b>A to 120</b>C (hereinafter, collectively referred to as the terminal 120) has a delivery management unit in the control unit 330. The other functional configuration of the terminal 120 is the same as that of the terminal 120 of the first embodiment.

The delivery management unit of the terminal 120 has a function for making a delivery request to the terminal 120C. As an example and not by way of limitation, the delivery management unit of the terminal 120 instructs the transmission unit of the terminal 120 to transmit the delivery request to the deliverer for each transaction. The delivery request includes information such as an address necessary for delivery and the like, as well as information about transaction information in which a delivery charge as a delivery source is deposited.

<Trading System Operation Processing of Second Embodiment>
The processing sequence according to the second embodiment will be described with reference to FIG. 9. The figure shows an example of a sequence diagram showing a process performed by the transaction system 1 in the second embodiment. Note that the processing procedure described below is merely an example, and each processing may be modified as much as possible within the scope of the technical idea of the present disclosure, and omission of steps, replacement, and addition may be appropriately performed. is there.

In the following description, it is assumed that the purchaser (user A) deposits the shipping fee. However, the form of the deposit is not particularly limited, and both the purchaser (user A) and the seller (user B) may make a deposit, or the seller (user B) may make a deposit.

(Process to receive delivery request)
In step S901 shown in FIG. 9, the delivery management unit of the terminal 120A instructs the transmission unit to transmit the delivery request to the third terminal 120C. At this time, the delivery management unit preferably obtains the public key of the deliverer (user C).

(Processing to deposit shipping charges)
In step S902, the transaction information creation unit 331 of the terminal 120A acquires the public keys of the user A and the user B according to the user operation.

In step S903, the transaction information creation unit 331 of the terminal 120A creates transaction information for depositing the delivery charge according to the user operation. At this time, the electronic signature unit 333 of the terminal 120A instructs the communication I/F 312 to electronically sign the transaction information for deposit with the first secret key and transmit it to the block chain network.

Here, as an example, the transaction information for deposit refers to information that refers to the UTXO that the purchaser received the virtual asset to be retransmitted this time, and the release condition (typically, the unlock condition specified by the UTXO) as input. Is the purchaser's signature and public key). Further, in the output, the amount corresponding to the delivery charge is specified as the remittance amount, and the hash value of the public key of the seller and the purchaser is specified as the unlocking condition.

In step S904, the first transaction information is approved and recorded in the blockchain network. Then, in step S905, the reception unit of the terminal 120C receives the information regarding the transaction information for deposit from the block chain network.

(Process to create transaction information to move the deposited virtual asset)
In step S906, the transaction information creation unit 331 of the terminal 120A transmits transaction information for moving the deposited delivery charge to the deliverer (user C) in accordance with a user operation (hereinafter, also referred to as “transaction information for movement”). Create). The transaction information for moving may be created by the transaction information creating unit 331 of the terminal 120B or the terminal 120C.

The transaction information for transfer is, as output, the amount of the deposited delivery fee that you want to remit (typically the delivery fee minus the fee) and the unlocking condition (typically the delivery person's public key). Hash value of) and are specified. The unlocking condition is not limited to this, and may be any specified by the delivery person. Further, a pointer to an output (UTXO) of transaction information for deposit is designated as an input of transaction information for transfer. In addition, the input requires the signature of the purchaser and the seller in order to release the UTXO, but at this point, both are unsigned.

In step S907, the transaction information creation unit 331 of the terminal 120A instructs the communication I/F 312 to transmit the created transaction information for movement to the terminal 120C. At this stage, it is preferable that the user A has not signed the transaction information for transfer.

(Processing S1 for detecting that the terminal 120B approaches the terminal 120C)
In step S908, the proximity detection unit 332 of the terminal 120C certifies (encrypts) the terminal within the communication range of the wireless communication unit with the secret key of the delivery person (user C) via the wireless communication unit. The transmitting unit is instructed to transmit the information (also referred to as third certification information here).

In step S909, the approach detection unit 332 of the terminal 120B verifies the third certification information and confirms whether the owner of the terminal 120C is the current delivery person. Specifically, the approach detection unit 332 of the terminal 120B verifies whether the third certification information can be combined with the public key of the delivery person (user C) acquired by the delivery management unit.

In step S910, the approach detection unit 332 of the terminal 120B may transmit the confirmation result to the terminal 120C when it is confirmed that the terminal 120C is the delivery person in the delivery request. Accordingly, even the terminal 120C can confirm that the terminal 120B is the other party (seller) in the delivery request (step S911).

(Processing S2 for detecting that the terminal 120B approaches the terminal 120C)
In step S912, the approach detection unit 332 of the terminal 120B uses the wireless communication unit to generate authentication (encryption) with the secret key of the user B for a terminal within the communication range of the wireless communication unit (second). Instruct the sending unit to send the certification information).

In step S913, the approach detection unit 332 of the terminal 120C verifies the second certification information, and confirms whether the owner of the terminal 120B is the seller in this delivery request. Specifically, the approach detection unit 332 of the terminal 120C verifies whether the second certification information can be decrypted with the public key specified in the output of the transaction information for deposit.

In step S914, the approach detection unit 332 of the terminal 120C may send the confirmation result to the terminal 120B when it is confirmed that the owner of the terminal 120B is the other party (seller) in the delivery request. Accordingly, the terminal 120B can also confirm that the terminal 120C is the delivery person in the delivery request (step S915).

(Processing in which the seller electronically signs transaction information for mobile use)
When it is confirmed in step S916 that the terminal 120C has approached the terminal 120B, the electronic signature unit 333 of the terminal 120B electronically signs the transaction information for movement. At this time, the approach detection unit 332 of the terminal 120B can instruct the input/output I/F to pop up a confirmation screen for confirming that the electronic signature is to be performed on the display device.

(Processing S3 for detecting that the terminal 120A approaches the terminal 120C)
It may be possible to confirm that the approach detection unit 332 of the terminal 120C has approached the approach detection unit 332 of the terminal 120A by performing the same processing steps as the processing S1 except that the terminal 120B is replaced with the terminal 120A.

(Processing S4 for detecting that terminal 120A has approached terminal 120C)
It may be possible to confirm that the approach detection unit 332 of the terminal 120C has approached the approach detection unit 332 of the terminal 120A by performing the same processing steps as the processing S2 except that the terminal 120B is replaced with the terminal 120A.

(Processing in which the buyer electronically signs transaction information for mobile use)
The same as step S916 described above except that the terminal 120B is replaced with the terminal 120A.

Only one of the processes S1 and S2 or the processes S3 and S4 may be executed, or both may be executed.

In step S917, the terminal 120C instructs the communication I/F 312 to transmit the mobile transaction information signed by the purchaser and the seller to the block chain network.

<Third Embodiment>
The third embodiment is an embodiment in which a reservation fee is deposited when making a reservation for a restaurant and the virtual assets deposited when the restaurant arrives at the restaurant are returned to the deposit source.

In this transaction system 1, for example, the terminal 120D and the terminal 120E are connected via the network 130.

<Effects of Third Embodiment>
According to the third embodiment, the virtual asset is temporarily deposited as a reservation fee, and the terminal (terminal 120D) owned by the user (user D) of the store is the terminal (terminal owned by the store (user E)). 120E) within a predetermined distance, the reservation is considered fulfilled, and the deposited virtual asset is returned to the user (user D) side of the store. This makes it possible to use the virtual assets more effectively in a service in which the reservation money is temporarily stored. In addition, it is possible to avoid the occurrence of damage to the store by not visiting the store even though the user of the store makes a reservation.

<Functional configuration of the third embodiment>
The functional configuration of the third embodiment will be described below. In the following description, the same reference numerals will be given to the same functional configurations as those in the first embodiment, and description thereof will be omitted. The description of the same operation and effect as those of the first embodiment will be omitted. Hereinafter, differences from the first embodiment will be mainly described.

The terminal 120D and the fifth terminal 120E (hereinafter collectively referred to as the terminal 120) owned by the store user (user D) have the reservation management unit in the control unit 330. The other functional configuration of the terminal 120 is the same as that of the terminal 120A of the first embodiment.

The reservation management unit of the terminal 120 has a function for the terminal 120D to make a reservation request or the terminal 120E to receive a reservation request. By way of example and not limitation, the reservation manager of terminal 120D instructs the transmitter of terminal 120D to send a reservation request to terminal 120E for each reservation. The reservation request includes user information necessary for reservation.

<Trading system operation processing of the third embodiment>
A processing sequence according to the third embodiment will be described with reference to FIG. 10. FIG. 10 shows an example of a sequence diagram showing processing performed by the transaction system 1 according to the third embodiment. Note that the processing procedure illustrated in FIG. 10 is merely an example, and each processing may be modified as much as possible within the scope of the technical idea of the present disclosure, and steps may be omitted, replaced, and added as appropriate. Is.

(Process to receive delivery request)
In step S1001 shown in FIG. 10, the reservation management unit of the terminal 120D instructs the transmission unit to transmit the reservation request to the terminal 120E.

(Processing to deposit the reservation fee)
In step S1002, the transaction information creation unit 331 of the terminal 120D acquires the public key of the user E according to the user operation.

In step S1003, the transaction information creation unit 331 of the terminal 120A creates transaction information for depositing the reservation fee according to the user operation. At this time, the electronic signature unit 333 of the terminal 120D instructs the communication I/F 312 to electronically sign the transaction information for deposit with the fourth secret key and transmit it to the block chain network.

Here, as an example, the transaction information for deposit refers to the information that refers to the UTXO that the user received the virtual asset to be remitted this time, and the release condition (typically, the unlock condition specified by the UTXO) as input. Is specified with the user's signature and public key). Further, in the output, the amount corresponding to the reservation fee is specified as the remittance amount, and the hash value of the public key of the store is specified as the unlocking condition.

In step S1004, the first transaction information is approved and recorded in the blockchain network. Then, in step S1005, the receiving unit of the terminal 120E receives the information regarding the transaction information for deposit from the block chain network.

(Process to create transaction information to move the deposited virtual asset)
In step S1006, the transaction information creation unit 331 of the terminal 120D transmits transaction information for moving the deposited reservation fee to the user (user D) in accordance with a user operation (hereinafter, also referred to as “refund transaction information”). Create).

The transaction information for refund is the output of the amount of the deposit you want to transfer (typically the amount obtained by subtracting the commission from the reservation fee) and the unlocking conditions (typically the public key of the store). Hash value) and are specified. The unlocking condition is not limited to this, and may be any condition specified by the user. Further, a pointer to an output (UTXO) of transaction information for deposit is designated as an input of transaction information for refund. Also, the input requires the store's signature to release the UTXO, but it is not signed at this point.

In step S1007, the transaction information creation unit 331 of the terminal 120D instructs the communication I/F 312 to transmit the created transaction information for movement to the terminal 120E.

(Processing S1 for detecting that the terminal 120D approaches the terminal 120E)
In step S1008, the approach detection unit 332 of the terminal 120E generates (encrypts) the authentication information generated by the secret key of the store (user E) for the terminals within the communication range of the wireless communication unit via the wireless communication unit. The transmission unit is instructed to transmit (also referred to as fourth certification information here).

In step S1009, the approach detection unit 332 of the terminal 120D verifies the fourth proof information, and confirms whether the owner of the terminal 120D is the current reservation person. Specifically, the approach detection unit 332 of the terminal 120D verifies whether the fourth certification information can be combined with the public key of the store (user E) acquired by the reservation management unit.

In step S1010, when the approach detection unit 332 of the terminal 120D can confirm that the terminal 120E is the store in the reservation request, the approach detection unit 332 may transmit the confirmation result to the terminal 120E. Accordingly, the terminal 120E can also confirm that the terminal 120D is the other party (user) in the reservation request (step S1011).

(Processing S2 for detecting that the terminal 120B approaches the terminal 120C)
In step S1012, the approach detection unit 332 of the terminal 120D uses the wireless communication unit to generate (encrypt) the certifying information (the fifth) for the terminal within the communication range of the wireless communication unit using the secret key of the user D. Instruct the sending unit to send the certification information).

In step S1013, the approach detection unit 332 of the terminal 120E verifies the fifth certification information, and confirms whether the owner of the terminal 120D is the user in the reservation request this time. Specifically, the approach detection unit 332 of the terminal 120E verifies whether the fifth certification information can be decrypted with the public key specified in the output of the transaction information for deposit.

In step S1014, when it is confirmed that the owner of the terminal 120D is the other party (user) in the reservation request, the approach detection unit 332 of the terminal 120E may transmit the confirmation result to the terminal 120D. Accordingly, the terminal 120D can also confirm that the terminal 120E is the reservation person in the reservation request (step S1015).

(Processing in which the seller electronically signs transaction information for mobile use)
When it is confirmed in step S1016 that the terminal 120E has approached the terminal 120D, the electronic signature unit 333 of the terminal 120E electronically signs the transaction information for movement. At this time, the approach detection unit 332 of the terminal 120E can instruct the input/output I/F to pop up a confirmation screen for confirming that the electronic signature is to be displayed on the display device.

In step S1017, the terminal 120E instructs the communication I/F 312 to transmit the signed mobile transaction information to the block chain network.

As described above, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the spirit of the invention. That is, the above embodiments are merely examples in all respects, and should not be construed as limited. For example, a common key may be used instead of the secret key, and the blockchain network does not necessarily need to follow the P2P communication protocol if the blockchain network is a network in which information regarding the blockchain is distributed and shared among the nodes.

Further, as the communication means used when confirming that the terminals have approached each other within a predetermined distance, a wired communication means may be used instead of the wireless communication means.

1... Trading system, 2... Confirmation method, 3... Confirmation method, 110... Server, 110A... Server, 110B... Server, 120... Terminal, 120A... First terminal, 120B... Second terminal, 120C... Third terminal, 120D ... fourth terminal, 120E... fifth terminal, 130... network, 200... information processing device, 201... processor, 202... memory, 203... storage, 204... input/output interface (input/output I/F), 205... communication interface (Communication I/F), 320... storage unit, 321... program, 330... control unit, 331... transaction information creation unit, 332... approach detection unit, 333... electronic signature unit,

Claims (13)

In the information processing terminal,
A step of creating transaction information for moving a predetermined virtual asset to a trading partner,
When the information processing terminal and another terminal approach within a predetermined distance, from the other terminal, proof information indicating that the transaction partner is received, via a wireless communication means,
Confirming whether or not the other terminal is a terminal owned by the trading partner based on the certification information;
When it is confirmed that the other terminal is a terminal owned by the transaction partner, a step of electronically signing the transaction information is executed.
program. The step of performing the digital signature includes
A step of displaying a confirmation screen for confirming that the electronic signature is performed on a display device,
The program according to claim 1. The certification information indicating that the trading partner is decryptable with the public key of the trading partner,
The program according to claim 1. When the information processing terminal and another terminal approach within a predetermined distance, a step of transmitting, to the other terminal, certification information indicating that the information processing terminal is a trading partner of the trading partner via wireless communication means. To execute
The program according to any one of claims 1 to 3. The certification information indicating that the trading partner is the trading partner is information that can be decrypted with the public key of the trading partner.
The program according to claim 4. A transaction information creation unit that creates transaction information for moving a predetermined virtual asset to a trading partner,
When the information processing terminal and the other terminal approach within a predetermined distance, from the other terminal, proof information indicating that the transaction partner, the receiving unit that receives via wireless communication means,
An approach detection unit that confirms whether or not the other terminal is a terminal owned by the trading partner based on the certification information,
An electronic signature unit that electronically signs the transaction information when it is confirmed that the other terminal is a terminal owned by the trading partner,
Information processing terminal. The information processing terminal
A step of creating transaction information for moving a predetermined virtual asset to a trading partner,
When the information processing terminal and another terminal approach within a predetermined distance, from the other terminal, proof information indicating that the transaction partner is received, via a wireless communication means,
Confirming whether or not the other terminal is a terminal owned by the trading partner based on the certification information;
Executing a step of electronically signing the transaction information when it is confirmed that the other terminal is a terminal owned by the trading partner.
Information processing method. In the information processing terminal,
Creating transaction information for moving a predetermined virtual asset to the owner of the information processing terminal;
When the information processing terminal and another terminal approach within a predetermined distance, from the other terminal, proof information indicating that the transaction partner is received, via a wireless communication means,
A step of confirming whether or not the other terminal is a terminal owned by a trading partner based on the certification information;
When it is confirmed that the other terminal is a terminal owned by the trading partner, a step of transmitting a signature request for requesting an electronic signature to the transaction information to a terminal owned by the trading partner. , Is executed,
program. In the information processing device,
Determining whether the first terminal and the second terminal have approached within a predetermined distance,
When it is determined that the transaction has approached, a digital signature is issued to the transaction information for moving a predetermined virtual asset to the user of the first terminal, and/or a signature request for requesting an electronic signature to the transaction information is issued. And transmitting to the second terminal,
program. The signature request includes a request for displaying a confirmation screen confirming that the electronic signature is to be performed on the display device of the second terminal,
The program according to claim 9. In the information processing terminal,
When the information processing terminal and the first terminal approach each other within a predetermined distance, proof information indicating a delivery person is transmitted to the first terminal via a wireless communication unit to perform the information processing. Requesting the user of the terminal to electronically sign the transaction information for sending the delivery fee;
When the information processing terminal and the second terminal approach within a predetermined distance, the transaction information is transmitted to the second terminal via the wireless communication means, the proof information indicating the delivery person. Requesting a digital signature from
Transmitting the transaction information signed by the first terminal and the second terminal to the blockchain network,
program. The information processing terminal
When the information processing terminal and the first terminal approach each other within a predetermined distance, proof information indicating a delivery person is transmitted to the first terminal via a wireless communication unit to perform the information processing. Requesting the user of the terminal to electronically sign the transaction information for sending the delivery fee;
When the information processing terminal and the second terminal approach within a predetermined distance, the transaction information is transmitted to the second terminal via the wireless communication means, the proof information indicating the delivery person. Requesting a digital signature from
Transmitting the transaction information signed by the first terminal and the second terminal to a blockchain network,
Information processing method. When the information processing terminal and the first terminal come close to each other within a predetermined distance, the proof information indicating the delivery person is transmitted to the first terminal via a wireless communication unit, and the information processing terminal A first transmission unit requesting the user of the user to electronically sign the transaction information for sending the delivery fee,
When the information processing terminal and the second terminal approach within a predetermined distance, the transaction information is transmitted to the second terminal via the wireless communication means, the proof information indicating the delivery person. A second transmission unit that requests the electronic signature from
A transaction information creating unit for transmitting transaction information signed by the first terminal and the second terminal to a block chain network,
Information processing terminal.