JP7242733B2 - Virtual currency management device, virtual currency management system, virtual currency management method, and computer program - Google Patents

Description

The present invention relates to a virtual currency management device, a virtual currency management method, and a computer program.

A system in which a requester who requests a task and a task executor who executes the task enter into a contractual relationship on the network, and a reward is paid from the requester to the task executor according to the task executed by the task executor. Are known.

A task is, for example, work performed on the Internet, and may be a task of opening or reading a message, a task of answering a questionnaire, contributing, posting, or reviewing a predetermined event.

It is known that in contractual relationships on such a network, smart contracts can be used to securely and reliably execute contracts regardless of mutual trust relationships. Smart contracts use blockchain technology and can transfer property using virtual currency without the intervention of an intermediary. When the task executor executes the task, the smart contract pays the task executor the amount of the virtual currency deposited in advance by the requester according to the task accomplished. Smart contracts allow the transfer of property without an intermediary. In addition, since the rewards for tasks on the network as described above are often very low compared to the rewards that occur in general contracts in the real world, Being able to interact is very useful.

However, according to the materials submitted by the Financial Services Agency's "Study Group on Virtual Currency Management Business", the current population of Japan with virtual currency trading accounts is about 3.5 million, and the number of people who receive rewards in virtual currency is small. It is assumed that there are many task executors for whom it is not easy. Therefore, there is a need for a virtual currency management device that can easily pay rewards to task executors who are not easy to receive virtual currency while taking advantage of the high reliability and low fees of transactions by smart contracts. ing.

JP 2016-151802 JP 2018-036893 JP 2016-081134 A

Patent Literature 1 describes an invention such as a virtual currency management method, in which virtual currency is issued to a user when a specific action is executed on an application on a user terminal. Patent Literature 2 discloses a generation program that generates a smart contract assuming payment between individuals on the Internet. However, none of the documents describe how users who do not have virtual currency trading accounts receive valuable value.

Patent Literature 2 discloses an advertisement browsing promotion system that gives a benefit to a user who browses an advertisement by attaching a two-dimensional code to the advertisement. However, this benefit is also based on the premise of electronic cryptocurrency based on public key cryptography, and there is no description of how a user who does not have a transaction account capable of receiving electronic cryptocurrency can receive valuable value.

Therefore, it is an object of the present invention to allow the task performer to select whether to receive rewards in virtual currency or other valuable value in smart contract transactions.

A virtual currency management device according to one aspect of the present invention is connected to a executor terminal, a requester terminal, and a blockchain network through a network, and has points tied to a requester having the requester terminal, and the executor terminal. and a point DB that stores holding points that are tied to the executor, and generation of a smart contract from the requester terminal to the blockchain network, and the deposit necessary for the generation of the smart contract. A point depositing unit that gives points corresponding to the deposited value to the point DB; a request receiving unit that receives a point exchange request transmitted along with execution of a task by an executor terminal; and based on the point exchange request , a task completion signal transmission unit that transmits a task completion signal to the blockchain network, and a virtual currency reception unit that receives virtual currency transmitted from the blockchain network in response to the task completion signal.

Further, the point deposit section is configured to refer to exchange rates of virtual currency and legal currency through a network, and to give points corresponding to the deposited value to the point DB according to the exchange rate. may

a reception detection unit that detects that the executioner terminal has received a virtual currency corresponding to the task from the blockchain network when a task completion signal is transmitted from the executioner terminal to the blockchain network; Further, the reception detection unit may be configured to invalidate the points corresponding to the virtual currency among the points held stored in the point DB.

The virtual currency receiving unit may further include a point exchange unit that exchanges a value corresponding to the amount of the virtual currency received by the virtual currency receiving unit for another value.

Further, when a determination request for determining whether to receive a reward for the task in virtual currency or in points is transmitted from the executor terminal, a determination unit for determining in which way the reward is to be received is further provided. may be provided.

Further, the determination unit compares the exchange rate of the virtual currency and the legal currency at a first point in time when the smart contract is generated with the exchange rate at a second point in time when the task is executed, It may be configured to determine to receive the higher form of fiat currency value for the reward.

A virtual currency management system according to one aspect of the present invention includes a blockchain network, a virtual currency management device, and a request to send a smart contract execution request to the blockchain network and a deposit process necessary for executing the smart contract. A system configured such that an operator terminal and an executor terminal that executes a task, generates a point exchange request according to the task, and transmits the point exchange request to the virtual currency management device can communicate via a network, The virtual currency management device comprises: a point DB that stores the owned points linked to the client having the client terminal and the owned points linked to the executor having the executor terminal; A point deposit section that detects that a smart contract has been generated in a blockchain network and that a deposit necessary for generating the smart contract has been made, and that points are given to the point DB in accordance with the deposited value. a request receiving unit that receives a point exchange request transmitted by the executioner terminal along with execution of the task; and a task completion signal transmission that transmits a task completion signal to the blockchain network based on the point exchange request. and a virtual currency receiving unit that receives virtual currency transmitted from the blockchain network in response to the task completion signal.

A virtual currency management method according to one aspect of the present invention is a method in which a virtual currency management device connected to a executor terminal, a client terminal, and a blockchain network via a network manages virtual currency, The virtual currency management device has a point DB that stores the owned points linked to the client having the client terminal and the owned points linked to the executor having the executor terminal. a step of detecting that a smart contract has been generated and that a deposit necessary for generating the smart contract has been made in the blockchain network, and giving points to the point DB according to the deposited value; a step of receiving a point redemption request sent by the executor terminal along with execution of a task; transmitting a task completion signal to the blockchain network based on the point redemption request; and the task completion signal. receiving virtual currency transmitted from the blockchain network in response to.

A virtual currency management program according to one aspect of the present invention is a virtual currency management program that is executed by a computer connected to an executor terminal, a requester terminal, and a blockchain network through a network, wherein the computer: Having a point DB that stores the owned points linked to the requester having the requester terminal and the owned points linked to the executor having the executor terminal, from the requester terminal to the blockchain network, a command for generating a smart contract and detecting that a deposit necessary for generating the smart contract has been made, and giving points corresponding to the deposited value to the point DB; , an instruction to receive a point redemption request transmitted along with execution of a task, an instruction to transmit a task completion signal to the blockchain network based on the point redemption request, and the blockchain in response to the task completion signal causing a computer to execute a command to receive virtual currency transmitted from a network;

According to the present invention, a task performer can choose whether to be rewarded in virtual currency or another valued value in smart contract transactions.

1 is a functional block diagram showing the functions of the virtual currency management device according to the first embodiment of the present invention and the components connected through a network; FIG. FIG. 10 is a sequence diagram showing the flow of processing executed by the virtual currency management device in response to a request creation request from a client; FIG. 11 is another example of a sequence diagram showing the flow of processing executed by the virtual currency management device in response to a request creation request from a client; FIG. 10 is a sequence diagram showing a flow of processing in which virtual currency is transferred to a task executor by the virtual currency management device in accordance with the accomplishment of the task by the task executor; FIG. 11 is another example of a sequence diagram showing a flow of processing in which virtual currency is transferred to a task executor by the virtual currency management device according to the achievement of the task by the task executor; FIG. 10 is a sequence diagram showing a flow of processing in which points are given to a task executor by the virtual currency management device according to the achievement of the task by the task executor, and the points are further exchanged for another valuable value; FIG. 7 is a functional block diagram showing functions provided in a virtual currency management device according to a second embodiment of the present invention; FIG. 10 is a sequence diagram in which the virtual currency management device automatically determines whether to pay a task executor a reward in virtual currency or in points.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a virtual currency management device according to the present invention will be described below with reference to the drawings.

● Virtual currency management device (1) ●
FIG. 1 shows the configuration of a virtual currency management device 1 according to an embodiment of the present invention. The virtual currency management device 1 is a device (an example of a computer) that generates a "smart contract", which is a program indicating a contract such as a commercial transaction on a platform that uses a public blockchain, in response to a request from a client. A smart contract is managed as a contract by linking a predetermined task with a reward according to the task, and when the task executor executes the task, the linked reward is paid. The virtual currency management device 1 is a device that pays a task executor a reward in virtual currency or another valuable value based on the contents contracted by the smart contract when the task executor executes the task.

In this embodiment, the task also includes the task of opening a bank account, registering or using a service. These tasks are called performance-based advertising (also called "affiliate marketing"). A reward is paid to the task performer by the requester, ie, the advertiser, when the task specified for the advertisement is performed. In this case, it is assumed that the requester is an advertiser and the task executor is a general consumer. This task also includes a task of permitting the requester to cite a post on SNS or a blog by the task executor. In this case, the client is assumed to be an operator of a curation site, a curator, various mass media, and the like. Task executors are assumed to be SNS users, blog writers, and the like.

In this description, a predetermined platform using blockchain is referred to as blockchain network 50 . The blockchain network 50 is a network that allows transactions using existing cryptocurrencies using blockchain, such as Ethereum. It should be noted that it may be possible to conduct transactions using a unique virtual currency.

A smart contract in the blockchain network 50 is a contract exchanged on the blockchain network 50 . A smart contract is a program that is written in a digital format and that automatically executes processing according to preset details when conditions set as contract details are achieved. Blockchain has a mechanism that maintains the reliability of information without the need for a central management system. Therefore, by generating a smart contract, the requester and the task executor can carry out commercial transactions without going through a server or the like that mediates commercial transactions.

In the present embodiment, for example, the requester generates a smart contract to pay a predetermined reward to an executor who has executed a certain task such as "open an email." The blockchain network 50 then manages this smart contract. Also, the task executor can know the details of the task linked to the smart contract, for example, by email or on an Internet site. When the task executor executes the task of "opening an email" and a signal indicating that the task has been completed (hereinafter also referred to as a "task completion signal") is received by the blockchain network 50, the blockchain network 50 Pay the reward corresponding to the completed task to the account linked to the terminal that sent the task completion signal.

As shown in FIG. 1, the virtual currency management device 1 includes a client terminal 30 used by a client, an executor terminal 40 used by a task executor, a blockchain network 50, a legal currency rate storage unit 60, and a network It is configured to be communicable via the NW. Communication among the virtual currency management device 1, the requester terminal 30, the executor terminal 40, the blockchain network 50, and the legal currency rate storage unit 60 is wireless in this embodiment, but some or all of the connections are It may be wired.

● Requester terminal 30
The requester terminal 30 is a terminal operated by a task requester such as an advertiser. The requester terminal 30 can input the content of the task, the reward paid to the task executor when the task is executed, and the total number of tasks. In addition, the requester terminal 30 can transmit a deposit signal for depositing the deposit property necessary for generating the smart contract to the blockchain network 50 when creating the request. The deposit property is, for example, a valuable value equal to, or equal to or greater than, the total amount of remuneration set for the task to be input. The deposit property is paid from the client's account and managed on the blockchain network 50 as, for example, virtual currency, more specifically cryptocurrency.

The client terminal 30 is, for example, a smart phone, a tablet terminal, or a computer. The client terminal 30 has a CPU (Central Processing Unit), a computer program executed by the CPU, a RAM (Random Access Memory) and a ROM (Read Only Memory) that store computer programs and predetermined data, etc. and the communication processing unit 32 constitute a functional block.

The input/output unit 31 is realized by a display or touch panel for inputting/outputting data, a microphone or a speaker for inputting/outputting voice data, or the like.

The communication processing unit 32 is a processing unit capable of executing data transmission/reception processing according to a predetermined protocol with the virtual currency management device 1 and the blockchain network 50 via a network NW such as the Internet. It is implemented by a browser or the like.

● Executor terminal 40
The executor terminal 40 is a terminal operated by a task executor who executes a task. Information about the task is notified from the client terminal 30 to the executor terminal. The information about the task is, for example, the content of the task and the set reward. In addition, the executor terminal 40 transmits a signal indicating acceptance of the request (hereinafter also referred to as "acceptance signal") in response to the notification of information on the task. Further, the executor terminal 40 is configured to be able to execute tasks. That is, for example, the executor terminal 40 sends, to a predetermined destination, the work of opening the mail, the sentences input by the task executor, information indicating that the task executor has approved the request from the requester, and the like. It is possible to perform operations such as

The executor terminal 40 is, for example, a smart phone, a tablet terminal, or a computer. The executor terminal 40 has a CPU (Central Processing Unit), a computer program executed by the CPU, a RAM (Random Access Memory) and a ROM (Read Only Memory) that store computer programs and predetermined data, and the like. A functional block composed of a virtual currency receipt requesting unit 42, a point receipt requesting unit 43, a consent transmitting unit 44, and a communication processing unit 45 is configured.

The input/output unit 41 is realized by a display or touch panel for inputting/outputting data, a microphone or a speaker for inputting/outputting voice data, or the like. The input/output unit 41 can input an operation for executing a task. In addition, the input/output unit 41 can input the selection result of whether the task executor receives the reward corresponding to the task in virtual currency or in another valuable value.

The virtual currency receipt requesting unit 42 transmits a task completion signal to the blockchain network 50 when an instruction to receive the reward corresponding to the executed task in virtual currency is received from the input/output unit 41. It is a functional part that

The point reception request unit 43 has a function of transmitting a point reception request to the request reception unit 13 (to be described later) of the virtual currency management device 1 when a selection is input to receive points as a reward for the executed task. Department. Points are another example of value. Upon receiving the point receipt request, the virtual currency management device 1 transmits a task completion signal to the blockchain network 50 .

The consent transmission unit 44 is a functional unit that transmits a consent signal to the blockchain network 50 in response to the notification of information regarding the task. Further, the consent transmission unit 44 may transmit a consent request to the virtual currency management device 1 instead of the consent signal. Upon receiving the approval request, the virtual currency management device 1 transmits the approval signal to the blockchain network 50 from the approval signal transmission unit 19, which will be described later.

The communication processing unit 45 is a processing unit capable of executing data transmission/reception processing according to a predetermined protocol with the virtual currency management device 1 and the blockchain network 50 via a network NW such as the Internet. It is implemented by a browser or the like.

●Legal currency rate storage unit 60
The legal currency rate storage unit 60 is a storage device that stores the current rates of the virtual currency managed by the blockchain network 50 and the legal currency. The virtual currency management device 1 can acquire the current virtual currency-legal currency rate from the legal currency rate storage unit 60 via the network NW. In addition, the legal currency rate storage unit 60 may also store past virtual currency-legal currency rates so that they can be referred to by the virtual currency management device 1 .

● Virtual currency management device 1
As described above, when the task executor executes the task, the virtual currency management device 1 rewards the task executor with virtual currency or other valuable value based on the contents contracted by the smart contract. is a device that pays for Specifically, the virtual currency management device 1 receives a request from the client terminal 30 and records the virtual currency deposited in the blockchain network 50 by operating the client terminal 30 as points of the same amount. When the executor terminal 40 receives the reward in the form of points, the virtual currency management device 1 transmits a task completion signal to the blockchain network 50, receives the reward virtual currency, and then responds to the reward. It is exchanged for points and sent to the executor terminal 40.例文帳に追加At the same time, the deposited points are redeemed. When the executor terminal 40 receives the reward in virtual currency, it detects that the virtual currency has moved from the block chain network 50 to the executor terminal 40 and invalidates the deposited points.

As shown in FIG. 1, the virtual currency management device 1 includes a point DB 11, a point deposit section 12, a request reception section 13, a task completion signal transmission section 14, a virtual currency reception section 15, a point exchange section 16, a reception detection section 17, Each functional block composed of a point invalidation unit 18, a consent signal transmission unit 19, and a communication processing unit 20 is configured.

The point DB 11 is a database that stores the owned points linked to the client having the client terminal 30 and the owned points linked to the executor having the executor terminal 40 .

The point depositing unit 12 detects that a smart contract has been generated from the client terminal 30 to the blockchain network 50 and the deposit necessary for generating the smart contract has been made, and points are awarded according to the deposited value. It is a functional unit that gives to the account linked to the requester in the DB 11 . Rewards are set in virtual currency on the smart contract. Also, the rate between points and legal currency such as yen is constant. Therefore, the point depositing unit 12 refers to the virtual currency-legal currency rate received from the legal currency rate storage unit 60, converts the remuneration into points, and gives the points to the client's account.

The request receiving unit 13 is a functional unit that receives a point exchange request generated by the executor terminal 40 .

The task completion signal transmission unit 14 is a functional unit that transmits a task completion signal to the blockchain network 50 based on the point exchange request.

The virtual currency receiving unit 15 is a functional unit that receives virtual currency transmitted from the blockchain network 50 in response to the task completion signal.

The point exchange unit 16 exchanges the points corresponding to the amount of the received virtual currency into another valuable value, and amortizes the exchanged points out of the points held by the performer stored in the point DB. It is a functional part that Another valuable value is assumed to be, for example, a gift certificate, another virtual currency such as Yen Peg currency, or the like. The exchange for other valuable value may be, for example, electronically sending the execution keyword of a gift certificate or discount coupon, or accessing a predetermined Internet site and giving the number of a prepaid card or the like to the task executor. By making the input, the valuable value held by the card may be increased. Alternatively, a gift certificate or the like may be sent by mail. Also, it may be exchangeable for a predetermined product or service.

The reception detection unit 17 is a functional unit that detects that virtual currency has been transferred from the blockchain network 50 to the executor terminal 40 .

The point invalidation unit 18 is a functional unit that invalidates points from the point DB 11 . When the receipt detection unit 17 detects the transfer of the virtual currency, the point invalidation unit 18 removes the points corresponding to the transferred amount of the virtual currency from the points linked to the executor terminal 40 stored in the point DB 11. Reduce. The amount of points deducted is determined based on the rate at the time the smart contract was generated.

The acceptance signal transmission unit 19 has a function of transmitting an acceptance signal from the executor terminal 40 to the blockchain network 50 when the executor terminal 40 receives the notification of the request and accepts the request. Department. Sending an acceptance signal to the blockchain network 50 may require paying a small amount of virtual currency to the blockchain network 50 . Therefore, according to the configuration in which the acceptance signal is transmitted from the virtual currency management device 1, compared to the case where the acceptance signal is directly transmitted from the executor terminal 40, the virtual currency A request can be accepted through the management device 1 . Also, even if the executor owns virtual currency, management of virtual currency related to a series of smart contracts can be centralized in the virtual currency management device 1 .

The communication processing unit 20 is a processing unit capable of executing data transmission/reception processing according to a predetermined protocol with the virtual currency management device 1 and the blockchain network 50 via a network NW such as the Internet. It is implemented by a browser or the like.

Flow of requester terminal 30 creating a request by smart contract via virtual currency management device 1 As shown in FIG. 2, client terminal 30 first requests virtual currency management device 1 to create a request (Step S101). The information included in the request for request creation includes, for example, the content of the task, the amount of remuneration set for the task, and the number of tasks.

The virtual currency management device 1 requests the virtual currency-legal currency rate to the legal currency rate storage unit 60 (step S102). Based on the request, the legal currency rate storage unit 60 transmits the virtual currency-legal currency rate at the time the request is received (step S103).

The virtual currency management device 1 transmits a contract creation request to the client terminal 30 (step S104).

Upon receipt of the contract generation request, the client terminal 30 notifies the client to that effect, and the client terminal 30 transmits a contract generation signal to the blockchain network 50 based on instructions from the client. (step S105). In addition, the client terminal 30 transmits a valuable value corresponding to the total amount of remuneration included in the contract to the blockchain network 50 as a deposit property (step S106). This remuneration is set in virtual currency, and the value corresponding to the total remuneration is determined by referring to the virtual currency-legal currency rate obtained in step S103. Steps S105 and S106 are out of order and may be performed simultaneously.

It should be noted that the instruction from the client may be omitted here, assuming that consent has been obtained at the time of the request for creation of the request by the client (step S101). That is, the client terminal 30 may automatically transmit a contract generation signal and a reward deposit signal to the blockchain network 50 based on the contract execution request from the virtual currency management device 1 (step S104).

The blockchain network 50 confirms the deposit property received from the client terminal 30 (step S107). Thus, a smart contract based on the request from the client terminal 30 is generated.

The point depositing unit 12 of the virtual currency management device 1 detects that the deposit has been confirmed by the blockchain network 50, and deposits points corresponding to the value deposited in the account associated with the client in the point DB 11. Give (step S108). In addition, the virtual currency management apparatus 1 notifies the executor terminal 40 that there is a task execution request from the requester terminal 30 and the contents of the request (step S109).

Upon receiving the notification, the executor terminal 40 transmits a signal indicating that the request has been received (hereinafter also referred to as an "acceptance signal") to the blockchain network 50 (step S110).

As shown in FIG. 3, the executor terminal 40 may transmit an approval request for the request to the virtual currency management device 1 instead of the approval signal (step S120). In this case, the virtual currency management device 1 that has received the acceptance request for the request transmits an acceptance signal to the blockchain network 50 (step S121).

●Flow in which executor terminal 40 receives reward in virtual currency As shown in FIG. 4, first, a task is executed on the executor terminal 40 by an operation of the executor (step S201). Note that the task may be automatically executed by a predetermined program. Next, a receipt request in virtual currency is input from the executor to the executor terminal 40 (step S202). The virtual currency receipt request unit 42 of the executor terminal 40 transmits a task completion signal to the blockchain network 50 (step S203). Note that the task is not limited to a positive operation, and may be a task that is completed after a predetermined period of time has passed since the acceptance signal was sent. In this case, the task completion signal is automatically sent after a predetermined period of time from the transmission of the acceptance signal.

As shown in FIG. 5, the virtual currency receipt request unit 42 may transmit a task completion request to the virtual currency management device 1 instead of the task completion signal (step S213). In this case, the virtual currency management device 1 that has received the task completion request transmits a task completion signal to the blockchain network 50 (step S214). When sending a task completion signal to the blockchain network 50, it may be necessary to pay the blockchain network 50 a small amount of virtual currency. Therefore, according to the configuration in which the virtual currency management device 1 transmits the task completion signal, the virtual currency management device 1 can unify the management of the virtual currency related to a series of smart contracts.

As shown in FIGS. 4 and 5, upon receiving the task completion signal, the blockchain network 50 transfers the reward corresponding to the task recorded in the contract to the virtual currency account of the executor as virtual currency ( step S204).

The receipt detection unit 17 of the virtual currency management device 1 detects that the virtual currency has been transferred from the blockchain network 50 to the virtual currency account of the executor (step S205). Based on this, the point invalidation unit 18 invalidates the points corresponding to the virtual currency among the points possessed by the client stored in the point DB 11 (step S206).

Based on the reception of the task completion signal, the points corresponding to the remuneration among the points held by the requester stored in the point DB 11 are transferred to the points held by the executor, and then the points corresponding to the remuneration are transferred. You can get the same effect by disabling the . According to this configuration, it is possible to obtain all task completion records of task executors by referring to the receipt/disbursement record of the point DB 11, regardless of the form of the reward received.

Flow of Executioner Terminal 40 Receiving Remuneration in the form of Points and Other Valuable Values As shown in FIG. 5, first, a task is executed on the executor's terminal 40 by the executor's operation (step S301). Note that the task may be automatically executed by a predetermined program. Executor terminal 40 receives a receipt request for another value from the executer (step S302).

The task completion signal transmission unit 14 of the virtual currency management device 1 transmits a task completion signal to the blockchain network 50 (step S303). Upon receiving the task completion signal, the blockchain network 50 transfers the reward corresponding to the task to the virtual currency management device 1 as virtual currency (step S304). The virtual currency receiving unit 15 receives this.

The point exchange unit 16 exchanges the points corresponding to the amount of the received virtual currency into another valuable value and sends it to the executor (step S305). Amortize the points for the amount paid (step S306).

The virtual currency management device 1 may exchange only the points corresponding to the remuneration set in the contract each time the task is executed, or may exchange the points owned by the client stored in the point DB 11. It is also possible to move and hold the points held by the performer, and collectively exchange the held points for another valuable value.

According to this configuration, a highly reliable smart contract can be executed by managing rewards in virtual currency on the blockchain network 50, while task executors can also receive rewards in value other than virtual currency. It can be received, and convenience can be improved for the task executor.

● Virtual currency management device (2) ●
A second embodiment of the virtual currency management device according to the present invention will be described with a focus on parts different from the first embodiment. This virtual currency management device differs from the first embodiment in that it has a determination unit that automatically determines whether the task executor receives the reward in virtual currency, points, or another value. different. In addition, the same code|symbol was attached|subjected regarding the structure similar to 1st Embodiment.

As shown in FIG. 5 , the virtual currency management device 100 of the second embodiment has a discrimination section 21 . When the determination unit 21 receives a determination request from the executor terminal 40 to determine whether the reward for the task is to be received in virtual currency, in points, or in the form of another valuable value, in which case the determination unit 21 receives the determination request. determine whether In the present embodiment, the determination unit 21 compares the exchange rate of virtual currency and legal currency at the first point in time when the smart contract is generated with the exchange rate at the second point in time when the task is executed. , decides to receive the higher form of fiat currency for the reward.

Flow of Executioner Terminal 40 Receiving Reward with Another Valuable Value As shown in FIG. 6, first, a task is executed on the executioner terminal 40 by an operation of the executioner (step S401). Note that the task may be automatically executed by a predetermined program. Next, the executor terminal 40 transmits to the virtual currency management device 100 a determination request for determining whether the reward for the task is to be received in virtual currency, points, or another value (step S402). ).

The task completion signal transmission unit 14 transmits a task completion signal to the blockchain network 50 (step S403), and the blockchain network 50 pays the virtual currency receiving unit 15 a reward according to the task in virtual currency. (Step S404).

The virtual currency management device 100 requests the virtual currency-legal currency rate from the legal currency rate storage unit 60 (step S405). The legal currency rate storage unit 60 transmits the virtual currency-legal currency rate at the time when the task was executed to the virtual currency management device 100 (step S406).

The determination unit 21 compares the virtual currency-legal currency rate at the first point in time when the smart contract is generated with the virtual currency-legal currency rate at the second point in time when the task is executed, and determines the legal currency for the reward. is determined to be received in the form with the higher value (step S407). As for the exchange rate at the first point in time, information acquired when the smart contract is generated may be held by the discriminating unit 21. It may be obtained from the currency rate storage unit 60 .

The virtual currency management device 100 sends rewards to the executor terminal 40 . When the determination unit 21 determines that the virtual currency is to be received, the virtual currency transmission unit 22 transmits the virtual currency to the executor terminal 40 . When the determining unit 21 determines that the reward is to be received with points, the point exchanging unit 16 exchanges it for points and sends it to the executor (step S408). Next, the point exchange unit 16 or the point expiry unit 18 amortizes or expires the amount of points corresponding to the sent reward from the point DB 11 (step S409).

According to this configuration, the task executor can reliably receive the reward amount set by the requester at the first time when the smart contract is created, in points, regardless of fluctuations in the virtual currency-legal currency rate. . On the other hand, if the virtual currency rate rises between the first time and the second time, the value received in virtual currency will be greater than the amount deposited by the client at the time of creating the smart contract. can be done. In other words, the task executor can obtain an operational profit from the virtual currency during the period from the first point of time to the second point of time. In other words, the task executor can obtain the opportunity to receive investment profits from fluctuations in the virtual currency-legal currency rate while guaranteeing the minimum amount of reward for the task.

Note that the determination unit 21 selects the form of receipt of the requested reward based on the selection result of whether to receive the reward for the task in virtual currency or in points, input from the executor terminal 40 in the past. may decide. For example, the configuration may be such that the form of receipt of the previous time is stored and the form of receipt is the same as that of the previous time.

1 virtual currency management device 11 point DB
12 Point deposit section 13 Request reception section 14 Task completion signal transmission section 15 Virtual currency reception section 16 Point exchange section 17 Receipt detection section 18 Discrimination section 30 Requester terminal 40 User terminal

Claims (9)

Connected through the network with the executor terminal, the requester terminal, and the blockchain network,
a point DB that stores holding points linked to a client having the client terminal;
a point depositing unit that detects that a deposit necessary for generating a smart contract has been made from the client terminal to the blockchain network, and gives points corresponding to the deposited value to the point DB; ,
The points given to the point DB according to the deposited valuable value transmitted from the blockchain network in response to reception of a task completion signal generated based on the execution of the task by the executor terminal. a virtual currency receiving unit that receives virtual currency corresponding to
A virtual currency management device. 2. The virtual currency according to claim 1, wherein said point depository refers to an exchange rate of a virtual currency and a legal currency through a network, and gives points corresponding to said deposited value to said point DB according to said exchange rate. Currency control device. a reception detection unit that detects that the executioner terminal has received a virtual currency corresponding to the task from the blockchain network when the executioner terminal transmits a task completion signal to the blockchain network; , the receipt detection unit revokes the points corresponding to the virtual currency among the points held stored in the point DB;
The virtual currency management device according to claim 1 or 2. further comprising a point exchange unit that exchanges a value corresponding to the amount of the virtual currency received by the virtual currency receiving unit for another value,
The virtual currency management device according to any one of claims 1 to 3. Further comprising a determination unit that determines when a determination request for determining whether to receive a reward for the task in virtual currency or in points is transmitted from the executor terminal,
The virtual currency management device according to any one of claims 1 to 4. The determination unit compares the exchange rate of virtual currency and legal currency at a first time point when the smart contract is generated with the exchange rate at a second time point when the task is executed, and compares the exchange rate with respect to the reward. decide to receive the higher form of legal tender;
The virtual currency management device according to claim 5. blockchain network and
a virtual currency management device;
a requester terminal that transmits a smart contract execution request and a custody process necessary for executing the smart contract to the blockchain network;
an executor terminal that executes a task, generates a point exchange request according to the task, and transmits the request to the virtual currency management device;
is configured to be able to communicate via a network,
The virtual currency management device
a point DB that stores holding points linked to a client having the client terminal;
a point depositing unit that detects that a deposit necessary for generating a smart contract has been made from the client terminal to the blockchain network, and gives points corresponding to the deposited value to the point DB; ,
The points given to the point DB according to the deposited valuable value, which are transmitted from the blockchain network in response to the reception of a task completion signal generated based on the execution of the task by the executor terminal, a virtual currency receiving unit that receives corresponding virtual currency;
A virtual currency management system. A virtual currency management device connected to a executor terminal, a requester terminal, and a blockchain network through a network is a method for managing virtual currency,
The virtual currency management device has a point DB that stores holding points linked to a client having the client terminal,
a step of detecting that a deposit necessary for generating a smart contract has been made from the client terminal to the blockchain network, and giving points corresponding to the deposited value to the point DB;
The points given to the point DB according to the deposited valuable value, which are transmitted from the blockchain network in response to the reception of a task completion signal generated based on the execution of the task by the executor terminal, receiving the corresponding virtual currency;
How to manage virtual currency, including; A virtual currency management program that is executed by a computer connected to a executor terminal, a requester terminal, and a blockchain network through a network,
The computer has a point DB that stores holding points linked to the client having the client terminal,
a command to detect that a deposit necessary for generating a smart contract has been made from the client terminal to the blockchain network, and to give points corresponding to the deposited value to the point DB;
The points given to the point DB according to the deposited valuable value, which are transmitted from the blockchain network in response to the reception of a task completion signal generated based on the execution of the task by the executor terminal, an order to receive the corresponding virtual currency;
A virtual currency management program that runs a computer.

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