JP7157015B2 - Smart contract system and program - Google Patents

Description

The present invention relates to a smart contract system that guarantees the validity of documents such as contracts concluded online. The present invention relates to a smart contract system and a program that enable processing based on etc.

[Conventional technology]
Traditionally, blockchain technology was used to guarantee the validity of online documents.
Ethereum, for example, is a technology that can register evidence on a blockchain from an electronic signature system.

[Related technology]
In addition, as related prior art documents, JP-A-2018-157432 "Generation device, verification device, and program" (Patent document 1), JP-A-2019-057827 "Distributed authentication system and program" (Patent document 2 ), International Publication No. 2017/010455 “Contract Agreement Method, Agreement Verification Method, Contract Agreement System, Agreement Verification Device, Contract Agreement Device, Contract Agreement Program, and Agreement Verification Program” (Patent Document 3).

Patent Literature 1 describes that a block chain is used to guarantee the validity of transactions between terminals, and that a hash value, private key information for each transactor, and transaction identification information are generated.
Japanese Patent Laid-Open No. 2002-200000 describes that the authenticity of a determination target is verified using a blockchain, and that the authenticity of document data can be obtained by matching hash values.
Patent Literature 3 describes that a trail of contracts is left on a blockchain, each transaction is chained, and the final agreeer terminal generates a transaction addressed to the contract issuer terminal.

JP 2018-157432 A JP 2019-057827 A WO2017/010455

However, in the above-described conventional technology, although the authenticity of a document is determined, in the case of a false document, the document creator cannot find the proper document, which is inconvenient.

In the conventional technology, when the document is a contract or the like, there is a method in which payment of money for the content of the contract is made in the virtual currency of the blockchain according to the instruction of the user. In the case of a contract, there is also the problem of a lack of convenience, as it does not automatically perform the payment of money according to the conditions stipulated by referring to the contents of the contract.

Incidentally, Patent Documents 1 to 3 do not have a function of judging the authenticity of a document and recommending a candidate document if the document is false, and there is no description of judging a contract and making an automatic payment.

The present invention has been made in view of the above-mentioned actual situation, and aims to provide a smart contract system and a program that can determine the authenticity of documents exchanged online and, if false, recommend an appropriate document. and

In addition, the present invention provides a smart contract system and program that determines whether a document is a contract or not, and if it is a contract, refers to the content of the contract and automatically pays money according to the specified conditions. intended to

The present invention, which solves the problems of the conventional example, is a smart contract system having a processing device for determining the authenticity of document data between user terminals , wherein an administrator terminal is provided to access the processing device, and processing is performed. The device generates a hash value for the document data from the user terminal, registers it in the blockchain network, stores the content of the document data so that it can be referenced from the outside, and when there is an inquiry for the hash value from the user terminal, the hash value is registered. Verify whether the hash value is registered in the blockchain network, and if it is registered, the document data corresponding to the hash value is judged true, and if it is not registered, the document data corresponding to the hash value is verified. If it is determined to be false, and the administrator terminal receives a payment instruction for the document data from the user terminal, it determines whether or not the document data is contract data. It is characterized by reading the conditions of money payment specified in the contents of the document data and executing the payment using the virtual currency of the blockchain according to the conditions .

In the smart contract system of the present invention, when the administrator terminal receives the document data from the user terminal, the administrator terminal accesses the processing device and retrieves the content of the stored document data similar to the document data. It is characterized by extracting document data and notifying it to the user terminal.

In the above-mentioned smart contract system, the administrator terminal, when the content of the contract data includes a provision to the effect that payment is to be automatically executed or not to be made, the present invention refers to the provision to automatically execute the payment. The payment is executed when there is a provision to the effect that execution is to be performed, and the payment is withheld if there is a provision to the effect that automatic execution of payment is not to be performed .

The present invention is a program executed by a processing device of a smart contract system and a program executed by an administrator terminal accessing the processing device, which causes the processing device to generate a hash value for document data from a user terminal. , register it in the blockchain network, store the content of the document data so that it can be referenced from the outside, and verify whether or not the hash value is registered in the blockchain network when the hash value is queried from the user terminal. If it is registered, the document data corresponding to the hash value is determined to be true, and if not registered, the document data corresponding to the hash value is determined to be false, and the administrator terminal When there is an instruction to pay money for the data, it determines whether or not the document data is contract data, and if it is contract data, reads the terms of money payment stipulated in the contents of the contract data. , is characterized by executing payment using blockchain virtual currency according to the conditions .

According to the present invention, there is provided a program executed by an administrator terminal in the above program , and when the administrator terminal receives document data from a user terminal, the administrator terminal accesses the processing device and extracts stored document data. document data similar to the content of the document data is extracted from the document data and notified to the user terminal.

In the above program, if the content of the contract data contains a provision to the effect or not of automatic execution of payment, the present invention causes the administrator terminal to refer to the provision to automatically execute payment. If there is a provision to the effect that the payment will be made, the payment is executed, and if there is a provision to the effect that the payment is not automatically executed, the payment is withheld .

According to the present invention, a processing device generates a hash value for document data from a user terminal, registers it in a blockchain network, stores the content of the document data so that it can be referenced from the outside, and generates a hash value from the user terminal. When there is an inquiry, it verifies whether the hash value is registered in the blockchain network, and if it is registered, the document data corresponding to the hash value is judged true, and if it is not registered, the hash value If the document data corresponding to the value is determined to be false, and the administrator terminal receives an instruction to pay money for the document data from the user terminal, it determines whether or not the document data is contract data. In that case, the smart contract system and program read the conditions of monetary payment specified in the contents of the contract data and execute payment using blockchain virtual currency according to the conditions, so the authenticity of the document is guaranteed, and there is an effect that everything from the conclusion of a contract online to the payment of money can be performed smoothly .

1 is a schematic diagram of the system; FIG. It is a figure which shows the hash value registration processing flow of a document. It is a figure which shows the authenticity determination processing flow of a document. FIG. 10 is a diagram showing a candidate document recommendation processing flow; It is a figure which shows a payment execution processing flow.

An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
A smart contract system (this system) according to an embodiment of the present invention determines the authenticity of a document exchanged online using blockchain technology, and if the determined document is false, the document It recommends documents that are presumed to be correct based on the party who exchanged the information, the date and time, and the title. It is possible.

In addition, this system determines whether the document is a contract, etc., and if it is a contract, etc., refers to the contents of the contract, and pays money according to the conditions of the contract. Blockchain virtual currency technology , and can be performed smoothly from the conclusion of a contract online to the payment of money.

Blockchain technology is a distributed network called distributed ledger technology.
A blockchain has a sequentially increasing list of ordered records called blocks, each containing a timestamp and a link to the previous block. Once recorded, the data in the block cannot be changed retroactively.

[Outline of this system: Fig. 1]
The system will be described with reference to FIG. FIG. 1 is a schematic diagram of the system.
This system basically comprises a smart contract providing server 1, an administrator terminal 2, a network 3, a party A terminal 4, and a party B terminal 5, as shown in FIG.
A smart contract providing server 1 , an administrator terminal 2 , a party A terminal 4 and a party B terminal 5 (hereinafter collectively referred to as “user terminals”) are connected to a network 3 .
Although only two user terminals are shown in FIG. 1 for the sake of simplification of explanation, a plurality of user terminals are actually connected.

[Parts of this system: Fig. 1]
Each part of this system will be specifically described.
[Smart contract providing server 1]
The smart contract providing server 1 is a processing device that includes a control unit 11 , a storage unit 12 and an interface unit 13 .
The storage unit 12 stores a processing program and document data in PDF format, which will be described later.
The interface unit 13 is an interface that connects to the network 3 .
The control unit 11 reads a processing program stored in the storage unit 12 and performs processing described below.

The smart contract providing server 1 connects to the network 3 and performs processing for registering hash values of electronic document data exchanged between the party A terminal 4 and the party B terminal 5 in the blockchain network.
The document data is, for example, in PDF format, and the storage unit 12 also stores the PDF format data whose hash value is registered in the smart contract providing server 1 .

Furthermore, when the smart contract providing server 1 receives an inquiry (input) for the hash value of the document data from the user terminal, it verifies whether or not the hash value exists in the blockchain network.
Specifically, if the inquired hash value exists in the blockchain network, the hash value of the document data is registered in the blockchain network, and the document data is determined to be true and does not exist. If not, it is determined that the document data is false because the hash value of the document data is not registered in the blockchain network.
Details of processing in this system will be described later.

[Administrator terminal 2]
The administrator terminal 2 is a computer device, includes a control section, a storage section, an interface section, a display section, an input section, etc., and connects to the network 3 .
In addition, if the inquired hash value is not registered, the administrator terminal 2 receives the document data of the hash value from the user terminal, and based on the contents of the document data, the document data that is presumed to be appropriate. recommend candidates for
Furthermore, the administrator terminal 2 determines whether or not the document data is a signed contract or the like, and if it is a contract or the like, the administrator terminal 2 executes the payment of money according to the contract conditions using the blockchain virtual currency. Execute the processing to be performed.

Network 3 is assumed to be the Internet and includes a blockchain network.
The party A terminal 4 is a terminal of one party that exchanges electronic document data.
The party B terminal 5 is the terminal of the other party that exchanges electronic document data.

[Details of processing: Figures 2 to 5]
Next, processing in this system will be described with reference to FIGS.
The processing of this system includes hash value registration processing, document authenticity determination processing, candidate document recommendation processing, payment execution processing, and the like.
Hash value registration processing and document authenticity determination processing are realized by the control unit 11 of the smart contract providing server 1 reading and executing processing programs from the storage unit 12, and candidate document recommendation processing and payment execution processing are performed. , the control unit of the administrator terminal 2 executes the functions.

[Hash value registration process: Fig. 2]
Hash value registration processing will be described with reference to FIG. FIG. 2 is a diagram showing a document hash value registration processing flow.
In the hash value registration process in the smart contract providing server 1, as shown in FIG. 2, when PDF format document data is received from the user terminal, the document data is stored in the storage unit 12 (S1) and A hash value is generated (S2) and registered in the blockchain network (S3). Then, the hash value registered in the blockchain network is returned to the user terminal (S4).

Moreover, the hash value can be registered not only for the electronic contract in which contract conclusion is completed, but also for document data in the middle of the contract.
However, the document data in the middle of the contract is excluded from the object of monetary payment because it is not the contract data that has been completed in the payment execution described later.

[Document authenticity determination process: Fig. 3]
Document authenticity determination processing will be described with reference to FIG. FIG. 3 is a diagram showing the authenticity determination processing flow of a document.
As shown in FIG. 3, in the document authenticity determination process in the smart contract providing server 1, when there is an inquiry from the user terminal as to whether or not a hash value has been registered on the blockchain (S11), the hash value is blocked. Verify whether it is registered in the chain network (S12), if it is a registered hash value (if Yes), determine that the document data is true (legitimate) (S13), and if it is a registered hash value If not (if No), the document data is determined to be false (S14), and the process is terminated.

[Candidate document recommendation process: Fig. 4]
The candidate document recommendation process will be described with reference to FIG. FIG. 4 is a diagram showing a candidate document recommendation processing flow. Candidate document recommendation processing is performed when it is determined to be "false" in FIG.
As shown in FIG. 4, in the candidate document recommendation process in the manager terminal 2, in response to an inquiry about a hash value from the user terminal, if the hash value is not registered, the corresponding false is determined from the user terminal. The received document data is received and stored in the storage unit (S21).

The administrator terminal 2 retrieves and extracts document data with high similarity from the date, title, party, description content, etc. of the document data (S22), and generates a list of candidate document data for the extracted document data ( S23).
Then, the administrator terminal 2 causes the user terminal to display a list of candidate document data, and when document data is selected from the list, the document data is displayed (S24). As a result, the user terminal can easily know the highly similar document data registered in the blockchain network with the document data determined to be "fake".

The administrator terminal 2 may directly display the list and candidate document data on the user terminal, or may notify the list by e-mail and display the document data selected from the e-mail list. good.
Also, even if the document data is not determined to be "false", the user terminal may transmit the document data to the administrator terminal 2 to have candidate documents recommended.

[Payment execution process: Fig. 5]
Next, payment execution processing will be described with reference to FIG. FIG. 5 is a diagram showing a payment execution processing flow.
In the payment execution process at the administrator terminal 2, as shown in FIG. 5, it is determined whether or not there is an instruction to execute payment for specific document data from the user terminal (S31).
The instruction may be an instruction for individual document data, but may be an instruction for each type of document as an initial setting, or may be an instruction to make all documents subject to payment execution.

If there is no payment execution instruction (No), the process is terminated, and if there is a payment execution instruction (Yes), the storage unit 12 of the smart contract providing server 1 is accessed, and the specific document is processed. It is determined whether or not the data is signed contract data (S32), and if it is not contract data (No), the process is terminated.

If it is contract data that has already been concluded in the determination process S32 (if Yes), the terms of payment are read by referring to the contract content of the contract data, and the payment is made using the virtual currency of the blockchain according to the terms. Execute (S33). Then, the administrator terminal 2 notifies the user terminal of the completion of payment based on the contract (S34).

Whether or not automatic payment is to be performed can be determined in advance between user terminals, and automatic payment can be set or suspended for each contract.
In addition, if the content of the contract includes a provision to the effect that the payment of money is to be automatically executed or not to be executed, it is possible to control whether the payment is automatically executed or not by referring to the provision. is.

[Effects of Embodiment]
According to this system, the smart contract providing server 1 uses blockchain technology to determine the authenticity of documents exchanged online, and if the determined document is false, the administrator terminal 2 , the party to whom the document was exchanged, the date and time, the title, etc., and recommends documents that are presumed to be correct, and the authenticity of documents such as contracts is guaranteed. There are effects that can be found.

In addition, this system judges whether the document is a contract or the like, and if it is a contract or the like, the administrator terminal 2 refers to the content of the contract and makes payment of money according to the payment conditions on the block chain. It is implemented using virtual currency technology, and has the effect of being able to smoothly perform everything from online contract conclusion to payment of money.

INDUSTRIAL APPLICABILITY The present invention is suitable for smart contract systems and programs that can determine the authenticity of documents exchanged online and recommend appropriate documents if they are false.

1 Smart contract providing server 2 Administrator terminal 3 Network 4 Party A terminal (user terminal) 5 Party B terminal (user terminal) 11 Control unit 12 Storage unit 13 Interface Department

Claims (6)

A smart contract system having a processing device that determines the authenticity of document data between user terminals,
providing an administrator terminal that accesses the processing device;
The processing device generates a hash value for the document data from the user terminal, registers it in a blockchain network, stores the content of the document data so that it can be referenced from the outside, and receives an inquiry for the hash value from the user terminal. If there is, it verifies whether or not the hash value is registered in the blockchain network, and if it is registered, the document data corresponding to the hash value is determined to be true, and if it is not registered, the hash value is verified. Judge the corresponding document data as false,
The manager terminal determines whether or not the document data is contract data when the user terminal instructs the user terminal to pay money for the document data, and determines whether or not the document data is contract data. A smart contract system characterized by reading conditions for money payment specified in the content and executing payment using blockchain virtual currency according to the conditions. When the administrator terminal receives the document data from the user terminal, it accesses the processing device, extracts document data similar to the document data from the stored document data, and sends the document data to the user terminal. The smart contract system according to claim 1, characterized by notifying. If the content of the contract data contains a provision to the effect that payment will or will not be automatically executed, the administrator terminal will refer to the said provision, and if there is a provision to the effect that payment will be executed automatically. 3. The smart contract system according to claim 1 or 2, wherein the smart contract system executes payment, and suspends payment if there is a provision that automatic payment is not executed. a program executed by a processing device of the smart contract system;
A program executed by an administrator terminal that accesses the processing device,
The processing device is caused to generate a hash value for the document data from the user terminal, register it in the blockchain network, store the content of the document data so that it can be referenced from the outside, and receive an inquiry for the hash value from the user terminal. Then, verify whether or not the hash value is registered in the blockchain network, determine that the document data corresponding to the hash value is true if it is registered, and correspond to the hash value if it is not registered. The document data to be judged as false,
When the user terminal instructs the administrator terminal to pay money for the document data, the manager terminal determines whether the document data is contract data, and if the document data is contract data, the contract data is determined. A program characterized by reading the conditions of monetary payment specified in the contents and executing the payment using blockchain virtual currency according to the said conditions. In the program executed on the administrator terminal,
When the document data is received from the user terminal, the administrator terminal accesses the processing device, extracts document data similar to the document data from the stored document data, and sends the document data to the user terminal. 5. The program according to claim 4, which causes notification. If the content of the contract data contains a provision to the effect or not to perform automatic payment, the administrator terminal is referred to the said provision, and there is a provision to perform automatic payment. 6. The program according to claim 4 or 5, wherein the payment is executed, and the payment is withheld if there is a provision to the effect that automatic payment is not executed.

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