JP6935662B1 - A system that proves that the record has not changed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blockchain technique for proving that a document record has not been modified by an creator. SOLUTION: A node on a blockchain network broadcasts a document record created and stored by itself and a token having identification information associated with the document record in one transaction, so that any node can find the location of the token, that is, Confirm that the document record has not been changed by verifying that it has not been issued. When the document record is a modification of what was previously created on the blockchain network, it is created on another blockchain network by referring to the transaction containing the document record before the change. If there is a related document record, check the latestness by including the hash value. In addition, the authenticity is estimated by attaching an electronic signature created with a private key corresponding to another newly authenticated public key. [Selection diagram] Fig. 5

Description

The present invention uses blockchain technology to record documents, etc. (not limited to letters, symbols, numbers, but any sound, images, moving images, or anything else that records human intentions, the same shall apply hereinafter). It relates to a system that proves that it has not been changed by the record creator, that is, it is up-to-date.

In recent years, participants (hereinafter referred to as "node participants") who are participating in a communication network (computer network) that connects computers can restore cryptographic assets, documents, and other records that they want to send by calculating in the opposite direction. Hash values and electronic signatures obtained by converting with practically difficult functions (such as cryptographic hash functions and scalar multiplication on elliptical curves) and electronic signatures (including and limited to electronic signatures defined in the Act on Electronic Signatures and Certification Services) Created as a data group (hereinafter referred to as "transaction") including (not possible), etc., generate at least one created transaction as a block, connect the generated blocks in a chain, and then node participants through the computer network. There is known a blockchain technology that is shared among a plurality of node participants by transmitting (broadcasting) to. In open source protocols such as Bitcoin and Ethereum, records of the same content are held in a storage area on the node participant's computer in the form of a blockchain, and some of the node participants verify it (called mining). ) To prove the authenticity, existence, and uniqueness of the record. In private chains provided by vendors such as IBM, there are many mechanisms in which predetermined node participants play the role of verification.
Based on this blockchain technology, Bitcoin's anonymous developer Satoshi Nakamoto devised UTXO (Unspend Transaction Output) as the data he wants to send, and node participants can execute transactions including UTXO indicating unused token values. Receive the token as the addressee, refer to the received OUTPUT (UTXO, the same applies hereinafter), attach the digital signature created with your own private key as a key (unlock key) for the recipient to verify, and attach the token. INPUT in a new transaction to pass to another participant, and a new UTXO containing all or part of the token values that you want to use from the unused token values contained in it, with the next recipient of the token as the addressee. We propose a mechanism to issue and distribute crypto assets called bitcoin by creating a transaction that includes both INPUT and OUTPUT, broadcasting it, and verifying it by mining by node participants. It is actually used (Non-Patent Document 1).
Since the falsification of the record recorded in the blockchain transaction is not recognized as a legitimate chain by mining, the falsification is virtually unrewarded, and the falsification is difficult to be performed. Due to this feature, blockchain technology is being applied not only to the issuance and transfer of cryptographic assets such as bitcoin, but also to various fields in which records such as various documents are stored and distributed.

In addition to the basic specifications of Bitcoin announced by Mr. Satoshi Nakamoto, such as the contents to be included in transactions in blockchain technology, engineers are free to bring their own technologies for various known specifications that can be used with the agreement of node participants. The Open Transactions Protocol that can be used for is published on the WEB (Non-Patent Document 2). There is a description that a unique indicator (ID) of a token other than bitcoin can be created by calculating from the hash value of OUTPUT referenced by the first INPUT and numbering it (The ID of an asset is the). RIPEMD-160 hash of the SHA-256 hash of the output script referenced by the first input of the tracing (that intially ssued) RIPEMD-160 hash of the hash of the hash By this method, a technique has been disclosed in which a marker (ID) that can be distinguished from other tokens unique to the token can be attached to each issued token. However, in this method, if the issuer of the token issues a UTXO having the same OUTPUT, the same indicator (ID) can be attached, so that there is a problem that uniqueness cannot be guaranteed.

The International Telecommunication Union's Telecommunications Standardization Division (ITU-T) has set X.D. as a computer network standard. 509, the standard of public key authentication infrastructure (PKI) is published. There, a trusted certificate authority certifies the personal attribution of the electronic signature created by the applicant with the private key (anyone can calculate the public key with a certain cryptographic function) (the applicant's electronic signature and it). Issuing a certificate authority certifying that it is the applicant's genuine signature (including an electronic signature created with his / her private key) to indicate to the applicant that the applicant's electronic signature belongs to the application. A public key certificate authority to prove is presented. (Non-Patent Document 3)
In response to this, Article 3 of the Law Concerning Electronic Signatures and Certification Business states that "electromagnetic records created to represent information (excluding those created by public officials on the job) are recorded in the electromagnetic records. When the information is electronically signed by the person (limited to the information that only the person can do by properly managing the code and property required to do this), it is genuine. Based on this, the Legal Affairs Bureau issues an electronic certificate for the electronic signature of the corporation and the representative based on the commercial registration by the RSA encryption method. (Non-Patent Document 4)

Satoshi Nakamoto, "Bitcoin: A Peer-to-Peer Electrical Cash System", 2008 Specifications of Open HTTPS Protocol: https: // github. com / OpenAccesss / open-assets-protocol Description of token ID setting in it: https: // github. com / OpenAssets / open-assets-protocol / blob / master / specialization. mediawiki #Protocol Overview International Telecommunication Union X. 509: Information technology-Open Systems Interconnection-The Direction: Public-key and authentication certificate frameworks (Public key authentication infrastructure) 10th month of the year, X.509) itu. int / rec / T-REC-X. 509-20121-S / en Ministry of Justice "Overview and User's Guide of Electronic Authentication System Based on Commercial Registration" 3rd Electronic Authentication System Based on Commercial Registration 2 Electronic Certificate "(Note 1) The electronic authentication system is the so-called" RSA public key cryptosystem "(Japan). Certification is performed for electronic signatures (as defined in Annex D of Industrial Standard X5731-8). "Http: // www. moj. go. jp / ONLINE / CERTIFICATION / GUIDE / guide03. html Japanese Unexamined Patent Publication No. 2019-12194 Special Table 2020-517200 Gazette

In order to prevent a third party from tampering with records such as documents, a method is taken in which the storage of the recording medium cannot be contacted or accessed by anyone other than the party who created the record, or if it is tampered with, it can be easily detected. .. Regarding the records on the distributed ledger by the blockchain technology, if the records are falsified, they are not regarded as valid records by mining, so that the falsification is easily detected and the records are not established. By this method, it can be virtually guaranteed that the document has not been tampered with, but the document record has not been changed by the creator who has the legitimate authority to change it, that is, the document record has been proved to be up-to-date. Must not be.
In this regard, in reality, for example, documents such as various certificates (family register, resident's card, registration, etc.) and contract documents recorded on paper or in the storage area of a computer should have a record of the creation time. There are many. If the document is genuine, the authenticity of the content is legally presumed, but it can be disproved, it is not sufficient as proof that it was really created at that time, and it is different from the fact. It is not impossible to write the time, and the records such as the above documents are the latest information and have not been revised or changed by the creator or a person with amendment authority (falsification by a third party without legitimate authority). There is a problem that it has not been proved (not falsification).

In this regard, for official proofs such as family register, resident's card, registration, etc., the public institution can tentatively prove the latestness of the various certificates by stating the date with the signature and seal of the public institution. However, for example, even if the Legal Affairs Bureau can prove that the copy of the register dated May 1, 2020 was the latest as of May 1, for example, the acquirer of the copy of the register submits it to the other party in the land sales contract. Even if the date of the event was May 10, it has not been proved that it is the latest as of May 10. Because it is possible that the register was changed on May 2nd. Therefore, documents required to be submitted by companies and public institutions often have conditions such as "seal stamp within 3 months" and "resident's card obtained within 1 month". Under these conditions, the possibility that revisions or changes have been made within that period cannot be ruled out, and there is the problem that the latestness in real time cannot be guaranteed at the time of submission.

Furthermore, the submitter of the document record cannot certify the contents of the submitted document by himself / herself without requesting the local government or the Legal Affairs Bureau, which is the creator of the document, to issue the certificate. There is a problem that the latestness cannot be proved.

In this regard, by physically attaching some kind of sign that is inseparable from the document record that can only be changed by the creator, whether it is one or more, to the document record that wants to prove the latestness, the creator himself puts the sign. If it is not changed, there will be a mechanism that cannot change the record, which is inseparable from the sign, and if anyone can check the sign, anyone can prove the latestness. In this regard, Patent Document 2 proposes management methods such as authority to issue, view, and destroy documents and restrictions on referrers, and time management of documents by time stamps so that the documents are not tampered with or forged or altered. However, instead of being managed by the entity participating in such a complicated and blockchain network, by setting a physical sign representing the right to change in the target document record itself, any node participant can be immediately and immediately. It is not an information processing system that confirms the latestness by recording the blockchain on hand. In addition, when the document record is revised, or the document record newly created by a different creator and the original document may be related and make sense as a whole. For example, when renewing a contract, it is necessary to integrally manage and refer to the old and new contracts when partially revising the previous contract. Also, taking the resident's card as an example, the resident's card newly created in Otomachi when a child is born and a new entry is made in the resident's card of the household, or when moving from Koichi to Otomachi, is Koichi. It was created on the premise of moving out of the resident's card from, and after moving in, Otomachi notifies Koichi of the establishment of a new resident's card, and the resident's card of Koichi is saved as a resident's card. It may be necessary to refer to the history of Otomachi's new resident's card, or to prove that Otomachi's resident's card is up to date based on that history. In this regard, Patent Document 1 traces back to the original document by creating the changed transaction by adding the hash value and the electronic signature to the pointer to the transaction indicating the original document (document before update) as an element. We are proposing verification methods such as confirming the author or owner. However, as for the method, a method of checking the similarity with the original document by a specific device (node) by setting up a management device has been proposed (how to check is not clearly described). ) In addition, under the method of creating a token with inseparable and unique identification information for records such as documents as in the present invention, how to specifically refer to the history to check the latestness of the blockchain network. There is no indication of a verification method that participants can confirm immediately and based on their own records. Therefore, since the design contents of the information processing system are different, the contents of the system are different even if the purposes are similar. Therefore, the solution of the problem to be solved by the present invention cannot be realized by Patent Document 1.

The present invention has been made to solve the above problems, and is a blockchain consisting of nodes that have agreed to store the same document records (in [0010] to [0017], simply referred to as "document records"). On the network, a document record and its pre-change document record and a token having inseparable and unique identification information for the document record are placed in the same transaction as the document record by blockchain technology, and the token is created as a document record. By paying out to all the persons, broadcasting the transaction on the blockchain network and recording it in the distributed ledger of the node participants, any node participant confirms the location of the token by the information processing device (block). By confirming that it is not in the paid-out state in the chain), the right to change has not been exercised immediately (in real time), and thus the stored document record has not been changed with the involvement of all authors. That is, if there is a document record before change, an information processing system and a blockchain structure that can prove the latestness of the document record to any of the other node participants by referring to the change history and the like are provided.

In order to solve the above problems, the information processing system according to the present invention is on a blockchain network in which a node having an information processing device that stores a document record agrees to store the same document record as another node. in transaction broadcasting, creates a token with the node identification information Zui indivisible uniquely cord to the document recorded by a method of referring to a pre-transaction separately containing a token on the block chain network unused received Then, the document record and the transaction including the issue of the token to all the creators of the document record are transmitted, and each node on the blockchain network is inseparably and uniquely linked to the document record. It is an information processing system characterized by including a step of storing a token having the above.

The present invention, the identification information Zui inseparably a unique string to the document recorded in the transaction to broadcast, the ID information of the transaction including the token on the block chain network unused said node receives advance separately It can be created by referring to a numerical value that indicates the order within the transaction.

The present invention, in a transaction that broadcasts identification information that is inseparably and uniquely associated with the document record, when the creator of the document record is the node and another node or a plurality of other nodes. public key nodes attached to the transactions that payout addressed to nodes involved in themselves and all creating a token on the block chain network unused previously received separately (the another node or the other plurality of nodes) by referring to the data made from itself or the public key, it can be made to create.

The present invention is a system for converting a hash value the document recorded in each recording is provided outside the block chain network, by citing the hash value from said system by said block chain network it can be made to create ..

The present invention, in the above transaction comprising a document record, the block can refer to transactions including the written record of previous changes made in chain network, or the block chain other documents record created in the network outside the The hash value of can be included in the document record.

The present invention is a private key created by a public key (authentication public key) in which the electronic signatures of the node, the other node, and the other plurality of nodes are authenticated by an electronic certificate based on a public key authentication platform. the system can be created by (recording private key) provided outside the block chain network, each node the electronic signature from the system uptake, it is possible to include the own the digital signature to transaction in the block chain network ..

The blockchain data structure of the present invention is inseparable from the address of the node participating in the bookchain network, the address of the destination node, the hash value of the document record created outside the blockchain network, and the document record. in in anda token with identification information Zui uniquely string, said block chain network transaction that references the transaction including the written record of previous changes made, the processing method of the recorded block chain data structure Therefore, every node participating in the blockchain network has an unused token having identification information that is inseparably and uniquely linked to the document record by the information processing device, that is, it has not been issued. By verifying, it is confirmed by referring to the document record before the change that the document record has not been changed by any node that is the document creator to whom the token is issued. It is a processing method of the blockchain data structure used.

According to the present invention, by verifying that no node of the blockchain network has a token having identification information that is inseparably and uniquely linked to the document record, that is, it has not been issued. It can be confirmed that the document record to be saved has not been changed by the node that is the document creator to which the token is issued. The fact that the documents, etc. records have not been revised because there are rules such as agreements between the nodes participating in the blockchain network to create, store, and revise the documents, etc. records within this information processing system. Not only the creator but also the node participants can immediately prove it by verifying the blockchain record in the storage unit of their own information processing device, that is, the distributed ledger. Since the document record and the token are in one transaction, it is necessary to pay out the token in order to revise the document record (since the destination of the token is all creators, participate in a single node. If it is created by a person, the node of the creator itself, if it is created by a multi-node participant, the node of all creators is the destination), and the fact that it is not issued means that it has not been changed.

If the record of the above documents is the real estate registration of the Legal Affairs Bureau, the node participant himself will request a copy of the registry, and companies and individuals who do not participate in the node will request the node participant without requesting the registry office. The immediate status can be proved to a third party (the destination of the copy of the registry). If the record of the above documents is a family register or resident's card, if the citizen is a node participant, ask the node participant himself, if not a node participant, ask the node participant, and without asking the city hall, the immediate state is the first. It can be submitted and certified to three parties (the place to submit a copy of the family register and a copy of the resident's card). If the document record is a contract, two or more nodes that are the contract creators can prove that the contract is up-to-date by themselves or other node participants. Compared to the current paper and other system methods, node participants other than the creator of the document record, firstly themselves, secondly immediately, and thirdly including history (history on the blockchain). (For management), it is possible to prove that the records such as the above documents have not been changed, that is, the latestness.

In addition, when the document record is revised, for example, when the document record is a contract, the number of contractors increases, such as changing from a two-party contract to a three-party contract, or conversely, the contract contractor changes from a three-party contract to a two-party contract. In the case of reduction, the location of the token that proves the latestness of the document record can be maintained by issuing a new token having the identification information associated with the revised document record (for the document record). A method of creating a token having identification information that is inseparably and uniquely linked only by a transaction related to document recording ([0012]), in the case of using the Open Assets Protocol, etc., is inseparably and uniquely linked to a document recording. A method of creating a token having identification information by paying out bitcoin to all document creators in advance before creating a transaction for recording a document or the like ([0013]). In that sense, the token has the right to change the document or the like record. Has the property of representing.

By providing a system outside the blockchain network that converts the records such as documents into hash values for each record, the hash values can be quoted from the system in the blockchain network by the one signal (transaction). , The node can put the document or the like record as a hash value in the transaction and broadcast it, and the other node which is the receiver can restore the hash value to the original document or the like record by the system.

When the document record is created in the past on the same blockchain network, a digest of the hash value of the past document record is newly created by the transaction including the document record to be created. Also, if it was created on another blockchain network, by including a digest of the hash value of other document records in the new document record on the blockchain network, before the change in the network It is possible to confirm the change history and the status of other related document records by combining the other document records such as the above-mentioned document records or other document records outside the network with the newly created document records. If the document record is a contract of the same party, you can check it including the change history. If the document record is a resident's card, change the resident's card before moving out to a temporary moving out resident's card and move out. By taking the hash value of the new resident's card in the previous (on a blockchain network different from the original resident's card issuing municipality) into the record of the resident's card of temporary transfer, and broadcasting and verifying it, the resident's card You can create and save a resident's card (including the hash value of the new resident's card created by the local government of the new residence, and the resident's card before moving out is referred to in the transaction).

The node, the other node, the third and other nodes are created as a public key (authentication public key) holder authenticated by an electronic certificate based on a public key authentication platform in a system provided outside the blockchain network. An electronic certificate is attached to the public key (public key for recording) by itself, and an electronic signature using the private key (private key for recording) paired with the public key for recording is created, and the above is described in the blockchain network. By including your own electronic signature in the signal (transaction), the electronic certificate issued by the Legal Affairs Bureau in Japan for the electronic signatures of corporations and representatives based on commercial registration will be issued for the records such as documents to be stored. Since the encryption function of the electronic signature used in the blockchain network, which is the RSA encryption method, is the elliptical curve encryption, the electronic signature and authentication of the legal bureau cannot be used as it is in the blockchain network. Article 3 of the Business Law "Electromagnetic records created to represent information (excluding those created by public officials for their duties) are digitally signed by the person himself / herself regarding the information recorded in the electromagnetic record. By properly managing the code and property necessary to do this, it is limited to those that can only be done by the person himself / herself.) When it is done, it is presumed that it was genuinely established. " Electronic signatures subject to the provisions of the above can be attached to records such as documents.

本発明の実施形態の情報処理システムによって実行される情報処理方法である、真正性の推定を受ける電子署名を付した前記保存する文書等記録の作成時の情報処理の各ステップを説明するための説明図である。 It is a block diagram which shows an example of the schematic structure of the information processing system of embodiment of this invention. It is a block diagram which shows an example of the schematic structure of the node of embodiment of this invention. FIG. 5 is a schematic block diagram of a computer that functions as a node (including both on a blockchain network and on a distributed system) according to an embodiment of the present invention. A single node creates the document or the like record, which is an information processing method executed by the information processing system of the embodiment of the present invention, and documents a token having identification information that is inseparably and uniquely associated with the document or the like record. It is explanatory drawing for demonstrating each step of information processing at the time of making only the transaction related to equal recording. A token having identification information that is inseparably and uniquely associated with the document record, which is an information processing method executed by the information processing system of the embodiment of the present invention, is created by a plurality of nodes. It is explanatory drawing for demonstrating each step of information processing at the time of making only the transaction related to equal recording. A token having identification information that is inseparably and uniquely associated with a document or the like record by a plurality of nodes creating the document or the like record, which is an information processing method executed by the information processing system of the embodiment of the present invention. It is explanatory drawing for demonstrating each step of information processing by Open Assets Protocol which creates a bitcoin by paying out to all document creators in advance before creating a transaction related to equal recording.

To explain each step of information processing at the time of creating the record such as a document to be stored with an electronic signature that receives an estimation of authenticity, which is an information processing method executed by the information processing system of the embodiment of the present invention. It is explanatory drawing.

Hereinafter, examples of the present invention will be described with reference to the drawings. The embodiment of the present invention is not limited to the following examples.

<System configuration of information processing system>

FIG. 1 is a block diagram showing an example of a schematic configuration of the information processing system of the present embodiment. As shown in FIG. 1, the information processing system 10 of the present embodiment is a blockchain having a communication unit between the blockchain network 11, the distributed system 12, and both the blockchain network 11 and the distributed system 12. It consists of multiple nodes that have agreed to record and store the same documents on the network. The blockchain network 11 can communicate with another blockchain network 13 via the Internet or via a distributed system 12. The blockchain network 11 or 13 may be the Internet or a part thereof, or may be a private network. The plurality of nodes 10A to 10F are connected by a blockchain network 11 such as the Internet, and can transmit and receive to each other via the network 11. Nodes 10A to 10F are examples of the information processing apparatus of the present disclosure. Note that the node is simply referred to as "node 10" except when a specific node is described.

As shown in FIG. 2, the node 10 functionally includes a processing unit 13 and a communication unit 14. The node 10 can be realized by, for example, the computer 20 shown in FIG. The computer 20 includes a CPU Central Processing Unit (21), a non-volatile storage unit 22, a memory 23 as a temporary storage area, an input / output interface (I / F) 24 to which an input / output device (not shown) is connected, and recording. A read / write (R / W) unit 25 that controls reading and writing of data to the medium is provided. Further, the computer 20 includes a blockchain network interface 26 and an I / F communication unit 27 with a distributed system, and includes a CPU 21, a storage unit 22, a memory 23, an input / output I / F 24, an R / W unit 25, and a blockchain network. The I / F 26 and the I / F communication unit 27 with the distributed system are connected to each other via the board bus 28. The storage unit 22 can be realized by a Hard Disk Drive (HDD), a solid state drive (SSD), a flash memory, or the like. A program for operating the computer 20 is stored in the storage unit 22 as a storage medium. The CPU 21 reads the program from the storage unit 22, expands it in the memory 23, and sequentially executes the processes included in the program.

A blockchain as a distributed ledger is stored in a storage unit (not shown) of the node 10. In the blockchain network 11 of the present embodiment, by implementing the Open Assets Protocol, assets different from Bitcoin can be traded as tokens. The transaction information of the token is written in the blockchain in the same manner as Bitcoin.

Node 10 creates an INPUT UTXO that creates the token different from the bit token by implementing the Open Assets Protocol. It is known that the token different from the bit token is created by the implementation of the Open Assets Protocol, but the method of giving the token inseparable and unique identification information to the record such as a document is according to the present invention.

The node 10 uses the distributed system 12 to record documents and the like created inside or outside the information processing system 10 of the present embodiment (including and not limited to another blockchain network 13) with a hash value or other not limited to the hash value. The value is converted into a digested value by the method, and the value is acquired through the I / F communication unit 27 with the distributed system 12. In the following, the digested value will be described as a representative hash value by a cryptographic hash function, but the digesting method is not limited to that.

Node 10 is used for sending and receiving on the blockchain network 11 the authentication digital certificate of its own public key (authentication public key) by the public key authentication platform acquired by the distributed system 12 and the separately created document record. In order to authenticate the public key for recording, an electronic certificate for recording (electronic certificate for the public key for recording) including an electronic signature created with its own authentication private key is used in the I / F communication unit 27 with the distributed system 12. Get through.

Node 10 either cites the ID number of the received transaction including UTXO of the unused token held and the order of UTXO within the transaction at the beginning of the transaction including the newly created document record, or Create a new unused bitcoin UTXO in advance. UTXO issued to all creators of document records with each record public key as the destination, the newly created document records, and Maker Output of Open Transactions Protocol. By either the method of creating a transaction containing (a tag for making bitcoin another token) (the method by the Open Assets Protocol, but other token protocols may also use such a method). Create a token that has identification information that is inseparably and uniquely linked to records such as documents. Create a transaction that pays out OUTPUT using the created token as INPUT together with the hash value of the document record to itself and all other document creators' public keys for recording, and all nodes through the blockchain network 11. Broadcast to.
<When there is only one creator of the document record and a token with identification information that is inseparably and uniquely associated with the document record is created only by the transaction related to the document record>

Taking Chart 4 as an example, when one person (single node) is the creator of the document record, the document record is first created and saved, and the document record to be saved and the document or the like showing the right to change the document or the like are first created and saved. An embodiment in which a token having identification information that is inseparably and uniquely associated with a record is transmitted to another node by one signal (transaction), and the other node receives this and performs verification. explain.

The node 10A (node of the blockchain network participant A), which is the document creator, is a private key for electronically signing a transaction on the blockchain including the hash value of the document record (hereinafter referred to as "recording secret key"). A step of creating a pair of a public key (hereinafter referred to as "public key for recording") is performed (step 41 <S41>, hereinafter "step" including figures and tables is abbreviated as "S"). In the following, these will be referred to as a recording private key A and a recording public key A in correspondence with the node names. The public key A for recording is publicly known by the node 10A by transmitting it via the blockchain network, another Internet, or posting it on its own WEB. Below, it is assumed that all public keys are publicly known and can be easily recognized by anyone.

Node 10A creates a record such as a document to be stored (it may be created by word, PDF, Excel, any software, or any medium that can be processed by the system), and the distributed system 12 Alternatively, the hash value is calculated by another system such as a cryptographic hash function, and the value is acquired via the communication unit 14 with the distributed system 12 (S42). In this embodiment, a system for converting the document or the like record into a digest of a hash value or the like for each record is provided outside the blockchain network, and the digest of the hash value or the like is transmitted from the system to the blockchain network 11 in the signal (transaction). The step (S42) that can be cited in the above is given, but as described in [0033], the digest method includes and is not limited to the method of mapping conversion by a cryptographic hash function, and blocks the mapping conversion for digest. A system that performs mapping conversion, either on the chain network 11 or another blockchain network 13, in a distributed system 12 connected to them, or to acquire the calculation result by a computer outside the network. The above location is not limited, all the same in the following examples.

Node 10A creates a signal (transaction) including a change right token and a hash value of a document or the like with an electronic signature of A on the blockchain network 11 by the following method, and the blockchain network 11 including itself is included. A step of transmitting to all the above nodes and receiving by each node is performed (S43).
First, 1) create an OUTPUT containing one or more unused holding tokens valid on the blockchain network 11 including bitcoin, and set the recording private key A so that the receiving node can unlock it. Attach the used electronic signature A. In the case of a single node, it is addressed to the node A itself, but in the case of a plurality of cases, it is addressed to all the document creators, so that the token cannot be used independently.
Next, 2) refer to the ID information of another transaction that received the possessed token of 1) at the beginning of the transaction and the numerical value indicating the order of OUTPUT within that transaction. Indivisible and unique identification information is given to the possessed token for the documents and other records created in this way. The transaction including the hash value of the document record is inseparable from the hash value, and since the ID information is unique on the blockchain network 11, the token included in the transaction has the hash value and the unique identification information. become.
Next, 3) create an OUTPUT with reference to the INPUT, and include the hash value of the document or the like record digitally signed using the recording secret key A (the hash value acquired in [0035] S42), and set the destination by itself. It is the public key A for recording.
A signal (transaction) including these 1) to 3) is created and transmitted to all the nodes on the blockchain network 11 including itself.

Each node stores the transaction received in [0036] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator verifies the contents of any of the other nodes 10B to F. It is confirmed by (S44). The verification contents are as follows.
First, verification that the document record has not been changed (unused change right token) (referred to as "verification that there is no change" in the following embodiment).
1) The destination of the OUTPUT is the public key A for recording. 2) The public key A for recording is calculated from the electronic signature by the private key A for recording attached to the OUTPUT, and matches the known public key A for recording. The creator is node 10A, which is the holder of the public key A for recording. (Unused, having a balance, and being unused means that the token has identification information that is inseparably and uniquely linked to the document record, so the document record However, it was created and transmitted by the intention of the sender, node 10A, and it was verified that it was not changed by a third party.)
Secondly, verification that the content of the record such as a document is the expected content (in the following embodiment, it is referred to as "verification of the content").
The document, etc. record obtained by verifying the electronic signature A attached to the hash value of the document, etc. record (same as 2 above) and restoring the hash value of the document, etc. record by the distributed system 12 is the document, etc. record known in advance. Must be the same

From [0034] to [0037], it is confirmed that the document record created by the node 10A is created and transmitted by the node 10A by any node, recorded in all the nodes, and has not been changed at the time of verification. can. If this node 10A is the city hall, the records such as documents are the family register or resident's card, and the other nodes are the citizens who are the owners of the family register or resident's card or their agents, apart from the problems of information access restrictions and personal information. , A mechanism can be created in which any citizen can immediately present the latest family register or resident's card to another public organization or company to which he / she is submitting, either by himself / herself or by another node participant.
<When there are multiple creators of document records and a token with identification information that is inseparably and uniquely associated with the document record is created only by the transaction related to the document record>

Taking Chart 5 as an example, when there are a plurality of creators (multiple nodes) of a document record, the document record is first created and saved, and the document record to be saved and the document or the like showing the right to change the document or the like are first created and saved. An embodiment in which a token having identification information that is inseparably and uniquely associated with a record is transmitted and received to another node by one signal (transaction), and the other node receives this and verifies it. Step) will be explained.

The document creators, node 10A (blockchain network participant A's node) and node 10B (blockchain network participant B's node), each electronically sign a transaction on the blockchain containing the hash value of the document record. A step of creating a pair of the recording private key A and the recording public key A, and the recording private key B and the recording public key B is performed (S51, S52). The public keys A and B for recording are publicly known by each node transmitting them via a blockchain network, another Internet, or posting them on their own WEB.

The node 10A or 10B creates a record such as a document to be stored, calculates the hash value by the distributed system 12 or another system by a cryptographic hash function or the like, and sets the value as the distributed system 12. The step of acquiring the document via the communication unit 14 of the above and transmitting it to the node 10B or the node 10A, which is the co-creator of the document record (S53). Next, when the node 10A creates a transaction, the node 10B digitally signs the hash value using the recording secret key B and transmits the hash value to the node 10A (S54). When the node 10B creates a transaction, the node 10A digitally signs the hash value using the recording private key A and transmits the hash value to the node 10B. An embodiment in which the node 10A creates a transaction will be described below, but the same can be performed in the reverse order.

Node 10A creates a signal (transaction) including a change right token and a hash value of a document or the like record with electronic signatures of A and B on the blockchain network 11 by the following method, and the blockchain including itself is included. A step of transmitting to all nodes on the network 11 and receiving by each node is performed (S55).
First, 1) create an OUTPUT containing one or more unused holding tokens valid on the blockchain network 11 including bitcoin, and set the recording private key A so that the receiving node can unlock it. Attach the used electronic signature A.
Next, 2) refer to the ID information of another transaction that received the possessed token of 1) at the beginning of the transaction and the numerical value indicating the order of OUTPUT within that transaction. Indivisible and unique identification information is given to the possessed token for the documents and other records created in this way. The transaction including the hash value of the document record is inseparable from the hash value, and since the ID information is unique on the blockchain network 11, the token included in the transaction has the hash value and the unique identification information. become.
Next, 3) a hash value of a document or the like record that is electronically signed by node 10A using the recording private key A and node 10B using the recording private key B after creating an OUTPUT with reference to the INPUT. The destination is the recording public key A and the recording public key B, including (the hash value acquired in [0041] S53 and S54).
A signal (transaction) including these 1) to 3) is created and transmitted to all the nodes on the blockchain network 11 including itself.

Each node stores the transaction received in [0042] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator verifies the contents of any of the other nodes 10C to F. It is confirmed by (S56). The verification contents are as follows.
First, verification that there is no change 1) The destination of the OUTPUT is the recording public key A and the recording public key B 2) The recording private key A and the recording public key B attached to the OUTPUT are used. The record public key A and the record public key B are calculated from the electronic signature, and the creator matches the record public key A and the record public key B with the known record public key A and the record public key B. Being the holders of the key B, node 10A and node 10B 3) There is no issue of tokens with identification information that is inseparably and uniquely linked to the records such as documents in OUTPUT, and there is a balance (unused). The fact that the token has a balance and is unused means that the token has identification information that is inseparably and uniquely linked to the document record, so that the document record is the sender. It was created and transmitted at the will of node 10A and node 10B, and it was verified that it was not changed by a third party.)
Secondly, the electronic signature A and the electronic signature B attached to the hash value of the document record are verified (same as in 2 above), and the hash value of the document record is restored by the distributed system 12. The document record has the same content as the document record known in advance.

According to [0040] to [0043], the document records created by node 10A and node 10B are created and transmitted by node 10A and node 10B by any node, recorded in all nodes, and revised at the time of verification. You can confirm that it has not been done. If node 10A and node 10B are contracting parties, the latest contract details can be immediately confirmed among affiliated companies participating in the blockchain network 11, and the history can be verified by auditing and inspection after the fact. There is a mechanism that can be done.
<When there are multiple creators of document records, etc., using the Open Assets Protocol, etc. All bitcoins in advance before creating a transaction for document records, etc., have tokens with identification information that is inseparably and uniquely linked to the document records. When creating by paying out to the document creator of

Taking Chart 6 as an example, when there are multiple creators (multiple nodes) of a document or the like record, a token having identification information that is inseparably and uniquely associated with the document or the like record by the Open Transactions Protocol is used as a document or the like. Before creating a transaction for recording, bitcoin is paid out to the document creator in advance, and the public key attached to the OUTPUT or its hash value is created by quoting it in the transaction of document recording, and the token and the hash of the document recording are created. An embodiment (step) in which a value is transmitted / received to another node by one signal (transaction) and the other node receives the value to perform verification will be described. There are other token protocols in which such possessed tokens are paid out to all document creators in advance, but here, an example using the Open Assets Protocol will be described as an example.
According to the Open Assets Protocol, the unused bitcoin held in advance by the document creator is paid out as OUTPUT, the UTXO is used as INPUT, and the OUTPUT is set at the beginning of the transaction including the hash value of the document record. Although the identification information can be created by referring to the hash value of the attached public key, if there is only one creator of the document record, OUTPUT is sent to the creator himself, so the same identification information is used. It is easy to create and the uniqueness is not sufficiently ensured. In this regard, when there are a plurality of document creators and OUTPUT is sent to all the creators, it is not easy for one creator of the document or the like record to send the transaction to create the same identification information. An example thereof will be described here.

The document creators, node 10A and node 10B, create a pair of the recording private key A and the recording public key A, and the recording private key B and the recording public key B, and each node uses the blockchain network to create a pair. Alternatively, the steps (S61, S62) that are publicly known by transmitting via another Internet or posting on their own WEB are the same as in [0040]. Further, the node 10A or 10B creates a record such as a document to be stored, calculates the hash value by the distributed system 12 or another system by a cryptographic hash function or the like, and uses the value as the distributed system 12. The step (S63) of performing the step of acquiring the document and the like via the communication unit 14 and transmitting the document to the node 10B or the node 10A, which is the co-creator of the document record, is the same as in [0041]. However, in the case of the Open Asset Protocol, since the signatures of A and B are required for the entire hash value of the created transaction, it is sufficient for the node 10B to agree on the contents of the hash value of the document record (S64). ), It is not always necessary to repeat the steps of digitally signing using the recording private key B and transmitting the digital signature to the node 10A.

According to the Open Transactions Protocol, in order to create identification information that is inseparable from the document record, all the record public keys attached to the sent OUTPUT or their hash values are hashed with the document record. Refer to in the transaction that contains the value. For this reason, the document creator has not been used on the unused blockchain network 11 that is previously held for all document creators (to the recording public keys A and B of the document creators A and B). It is necessary to pay out the used token. That is, the node 10A creates an OUTPUT containing one unused owned bitcoin that is valid on the blockchain network 11, and attaches an electronic signature A using the recording private key A so that the receiving node can unlock it. Then, it is transmitted to the recording public keys A and B of the node 10A and the node 10B (S65).
Next, node 10A
1) Separately, the received bitcoin transmitted above is set as INPUT.
2) Refer to the hash values of all public keys for recording (A and B) attached to the INPUT at the beginning of the transaction.
3) Includes Maker Output from Open Assets Protocol
4) Create a transaction including the hash value of the document or the like record (S66), digitally sign the hash value with the private key A for recording, and obtain the electronic signature from the node 10B (S67) to pay out. Is addressed to the node 10A and the node 10B, that is, the recording public key A and the recording public key B, to all the nodes on the blockchain network 11 including itself, and each node performs a receiving step (S66).
Indivisible and unique identification information is given to the possessed token for the records such as documents created in 2) and 3) above. Since the unused token is inseparably unique from the hash value of the above transaction, the hash value and the unique identification information are transferred by being inseparably unique with respect to the hash value of the document or the like record in the transaction. The token included in will have.

Each node stores the transaction received in [0047] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator verifies the contents of any of the other nodes 10C to F. It is confirmed by (S67). The verification contents are the same as S56 in [0043], firstly, verification that there is no change (unused change right token) and verification of the contents of records such as documents.

According to [0046] to [0048], the document records created by node 10A and node 10B are created and transmitted by node 10A and node 10B by any node, recorded in all nodes, and revised at the time of verification. You can confirm that it has not been done. If node 10A and node 10B are contracting parties, the latest contract details can be immediately confirmed among affiliated companies participating in the blockchain network 11, and the history can be verified by auditing and inspection after the fact. The point that a mechanism that can be used is created is the same as in [0044].
<When changing the verified document record by referring to other records such as past document record>

Creation / verification in [0037] (when one creator of a document record is created and a token having identification information that is inseparably and uniquely associated with the document record is created only by a transaction related to the document record). A case where a completed document or the like record already exists and the document or the like record is changed will be described with reference to FIG. 7 as an example. In addition, [0043] (when there are a plurality of creators of the document record, and a token having identification information that is inseparably and uniquely associated with the document record is created only by the transaction related to the document record), [ 0048] (When there are multiple creators of document records, etc., and a token with identification information that is inseparably and uniquely linked to the document records, such as when using the Open Assets Protocol, is used as a bitcoin before creating a transaction for document records. Even in the case of creating by paying out to all document creators in advance), except that since there are multiple creators of records such as documents, electronic signatures with the public key for recording and the same private key are created and verified respectively. Since the points of creating and broadcasting the document record transaction are the same so that the history can be verified by combining the created / verified document record and the changed document record, the embodiment will be omitted.
When the document record is changed, the token representing the change right is incorporated as UTXO in the transaction including the changed document record, and the verified document is associated with the changed document. You can check the latestness of the changed document record by looking at the entire history of the record. Therefore, one signal is sent to the new token having the identification information that is inseparably and uniquely linked to the changed document record representing the change right and the changed document record associated with the changed document record. An embodiment (step) in which transmission / reception is performed to / from another node in (transaction), the other node receives this, and verification is performed will be described.

There is a document or the like record created in advance on the blockchain network 11 by the node 10A and verified and saved by another node (S71), or a document or the like record created, verified and saved by another blockchain network 13. Exists (S74).

When there is a document or the like record created in advance on the blockchain network 11 by the node 10A and verified and saved by another node (S71), the node 10A has the following change right token on the blockchain network 11. Create a signal (transaction) that includes the hash value of the changed document record with the digital signature of A and A, and refers to the hash value of the verified and saved document record created in S71, and make yourself A step of transmitting to all nodes on the including blockchain network 11 and receiving by each node is performed (S72). By referring to the hash value of the verified and saved document record, the node 10 to be verified can verify by referring to the history of the document record before the change and the document record after the change. In particular,
First, 1) A secret for recording because the node that received the OUTPUT created using the token with change right (S71) that has identification information that is inseparably and uniquely linked to the verification and saved document records can be unlocked. An electronic signature A using the key A is attached.
Next, 2) refer to the ID information of the original transaction that received the possessed token of 1) at the beginning of the transaction and the numerical value indicating the order of UTXO in the transaction. Indivisible and unique identification information is given to the possessed token for the documents and other records created in this way. The transaction including the hash value of the document record is inseparable from the hash value, and since the ID information is unique on the blockchain network 11, the token included in the transaction has the hash value and the unique identification information. become.
Next, 3) a hash value of a modified document or the like record in which an OUTPUT using the INPUT is created and digitally signed using the recording private key A (hash value obtained by the same method as in [0035] S42). The destination is the public key A for recording.
Including these 1) to 3), a signal (transaction) that refers to the hash value of the verification and saved document record created in S71 is created and transmitted to all the nodes on the blockchain network 11 including itself. ..

Each node stores the transaction received in [0052] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator of any of the other nodes 10B to F records documents and the like. It is confirmed by verifying that there is no change and the contents of the record such as sentences (S73, the method is the same as [0043] (S56)).

If there is another document or other record created, verified, and saved in another blockchain network 13 (S74), node 10A has the following change right token and A's digital signature on the blockchain network 11. Create a signal (transaction) including the hash value of the modified document record including the digest of other document records created, verified, and saved in S73, and create a signal (transaction) including itself, and all on the blockchain network 11 including itself. It sends to the nodes, and each node performs the step of receiving (S76). By creating a modified document record that includes the hash values of other document records that have been created, verified, and saved, the node to verify refers to the history of other document records and the modified document record. And can be verified. In particular,
First, 1) A secret for recording because the node that received the OUTPUT created using the token with change right (S71) that has identification information that is inseparably and uniquely linked to the verification and saved document records can be unlocked. An electronic signature A using the key A is attached.
Next, 2) refer to the ID information of the original transaction that received the possessed token of 1) at the beginning of the transaction and the numerical value indicating the order of OUTPUT within that transaction. Indivisible and unique identification information is given to the possessed token for the changed document record created in this way. The transaction including the hash value of the document record is inseparable from the hash value, and since the ID information is unique on the blockchain network 11, the token included in the transaction has the hash value and the unique identification information. become.
Next, 3) a modified document, etc. record including a digest of a document, etc. record created, verified, and saved in S74, in which an OUTPUTT using the INPUT is created and digitally signed using the recording private key A. (Hash value obtained by the same method as in [0035] S42) is included, and the destination is the public key A for recording.
A signal (transaction) including these 1) to 3) is created and transmitted to all the nodes on the blockchain network 11 including itself.

Each node stores the transaction received in [0054] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator of any of the other nodes 10B to F records documents and the like. It is confirmed by verifying that there is no change and the contents of the record such as sentences (S76, the method is the same as [0043] (S56)).

According to [0051] to [0055], the document record created by the node 10A is created and transmitted by the node 10A by any node, recorded in all the nodes, and has not been revised at the time of verification. It can be confirmed by referring to the change history together with the document record before the change. If this node 10A is the city hall, the records such as documents are the family register or resident's card, and the other nodes are the citizens who are the person of the family register or resident's card or their agents, apart from the problems of information access restrictions and personal information. When a citizen moves from one city to another, the city before the move creates a resident's card during the move procedure (S72) and verifies it by referring to the record of the resident's card before the move (S71). When a new resident's card is created in the town after the move (S74), the city before the move receives a communication from the town after the move, and the city before the move has the resident's card (S72) in the process of moving and after the move. You can create, verify, and save the resident's card exemption (combination of S72 and S75) of the citizen's resident's card (combination of S72 and S75) including the information of the resident's card (S74), and anyone including the citizen can participate in himself or another node. As a result, it is possible to immediately present the latest resident's card, including the history of expulsion before the move, to another public organization or company to which it is submitted.
<When attaching an electronic signature based on the creator's public key authentication platform to records such as documents>

Taking Chart 8 as an example, when there are a plurality of creators of a document record and a token having identification information that is inseparably and uniquely associated with the document record is created only by a transaction related to the document record. For the node A and the other node B, which are the equal record creators, to use as the public key (authentication public key) holder authenticated by the electronic certificate based on the public key authentication platform for the transaction of document recording. An electronic certificate is attached to the separately created public key (public key for recording) by itself, and each is attached to the record of the document, etc. using the private key (private key for recording) paired with the public key for recording. The electronic signature A and B for recording are created, the electronic signature A for recording and the electronic signature B for recording are taken in from the distributed system 12 provided outside the blockchain network, and the signal (transaction) is taken in the blockchain network. Explain an embodiment in which an electronic signature for recording one's own can be included.
Steps 81 (node 10A creates a pair of authentication public key A and authentication private key A) and step 82 (node 10B creates a pair of authentication public key B and authentication private key B) to step 87 (recording electronic) The certificate verifies that the public key A (or B) for recording was created by the holder A (or B) of the public key A (or) B), and there are multiple creators of records such as documents. The same is true even when the Open Authentication Protocol is used to create identification information that is inseparably and uniquely linked to a document record by a person, and node 10B is unnecessary when there is only one creator of the document record. It is the same except for the points. In addition, even if the verified and saved document records are changed, the document creator can obtain an electronic signature based on the authentication public key infrastructure and attach it to the changed document records by following this step. (The steps are the same as from S71 to S76).

The document creators, node 10A (blockchain network participant A's node) and node 10B (blockchain network participant B's node), have the authentication private key A, which is the target of the electronic certificate based on the authentication disclosure platform, respectively. A pair of the authentication public key A and a pair of the authentication public key B and the authentication private key B are created on the blockchain network 11 or in the distributed system 12 capable of communicating with the blockchain network 11 (S81, S82). Similarly, a pair of the recording public key A (or B) and the recording private key A (or B) is also created for use in the transaction of recording documents (S83, S84). At this stage, both the public / private key for authentication and the public / private key for recording are digital certificates based on the public key infrastructure (they are genuinely created by the certificate creation requester and are the public keys that they own. An electronically created and issued certificate issued by the issuing authority to certify) has not been issued.

Node 10A (node of blockchain network participant A) attaches the certification public key A and applies to the certification authority (for example, the legal bureau or specific certification body in Japan) to issue an electronic certificate based on the authentication disclosure infrastructure. , Issuance of an authentication electronic certificate (composed of A's electronic signature (authentication electronic signature A) created by the authentication private key A and the authentication authority's electronic signature created by the authentication authority's private key) for the authentication public key A. , Receive a grant. Similarly, the node 10B attaches the authentication public key B and applies to the certificate authority to issue an electronic certificate based on the authentication public infrastructure, and the authentication public key B is an authentication electronic certificate (with the authentication private key B). Issuance and issuance of the created electronic signature of B (authentication electronic signature B) and the electronic signature of the certification authority created by the private key of the certification authority (S85).

On the blockchain network 11 or the distributed system 12 capable of communicating with the blockchain network 11, the node 10A is genuinely created by the recording public key A created in advance (S83) as the holder of the authentication public key A. It issues and receives the electronic certificate A for recording (consisting of the electronic signature A for recording created with the private key A for recording and A's own electronic signature created with the authentication private key A) to prove that. Similarly, the node 10B also has a recording digital certificate B (recording digital signature B created with the recording private key B) proving that the node 10B is genuinely created by the recording public key B created in advance (S84). Is issued by himself (consisting of B's own electronic signature created with the authentication private key B) and is received by himself (both are S86).
The node 10A is a recording digital signature A with a recording private key A paired with a recording public key A to which a recording digital certificate A is attached on the blockchain network 11 or a distributed system 12 capable of communicating with the blockchain network 11. Is created and broadcast to each node including itself together with the recording digital certificate A and the authentication digital certificate A. Similarly, the node 10B is a recording electronic with a recording private key B paired with a recording public key B to which a recording digital certificate B is attached on the blockchain network 11 or a distributed system 12 capable of communicating with the blockchain network 11. Create a signature B and broadcast it to each node including itself together with the recording digital certificate B and the authentication digital certificate B (both are S86).

Each node, for nodes 10A, first the recording for electronic signature A from the recording public key digest of the document such as a recording that is contained with the A (hash value) calculated previously may upcoming digest (hash It is confirmed that it matches the value, etc.) , it is verified that it is the node 10A that has made the recording digital signature A with the recording private key A, and secondly, it is included in the recording digital certificate A. The digest (hash value, etc.) of the recorded documents, etc. included using the authentication public key A is calculated from A's own digital signature created with the authentication private key A, and matches the already known digest (hash value, etc.). It is confirmed that the digital certificate A for recording is genuinely created by the node 10A holding the authentication public key, and thirdly, the authentication authority included in the authentication digital certificate A Calculate the digest (hash value, etc.) of the recorded documents, etc. contained from the electronic signature using the public key of the certification authority, and confirm that it matches the already known digest (hash value, etc.). , It is verified that the authentication digital certificate A is genuinely issued by the authentication authority having the authentication authority by the public authentication infrastructure. According to these three verifications, in each node, node 10A is the holder of the authentication public key A authenticated by the authentication authority by the public authentication infrastructure, and the record public key A is genuinely created, and the record private key paired with it is created. It can be verified that the electronic signature A is created using A. Each node is the holder of the authentication public key B that has been authenticated by the certification authority by the public authentication infrastructure by the same three verifications for the node 10B, and the record public key B is genuinely created. It can be verified that the electronic signature B is created by using the paired record private key B (S87).

The node 10A or 10B creates a record such as a document to be stored, calculates the hash value by the distributed system 12 or another system by a cryptographic hash function or the like, and sets the value as the distributed system 12. The step of acquiring the document via the communication unit 14 of the above and transmitting it to the node 10B or the node 10A, which is the co-creator of the document record (S88). Next, the hash value is digitally signed using the recording private key B and transmitted to the node 10A (S89).

Node 10A creates a signal (transaction) including a change right token and a hash value of a document or the like record with electronic signatures of A and B on the blockchain network 11 by the following method, and the blockchain including itself is included. It sends to all the nodes on the network 11, and each node performs the step of receiving (S90 (same as S55)).
First, 1) Electronic using the recording private key A so that the node that receives the OUTPUT containing one or more unused holding tokens valid on the blockchain network 11 including bitcoin can be unlocked. Add signature A.
Next, 2) refer to the ID information of another transaction that received the possessed token of 1) at the beginning of the transaction and the numerical value indicating the order of OUTPUT within that transaction. Indivisible and unique identification information is given to the possessed token for the documents and other records created in this way. The transaction including the hash value of the document record is inseparable from the hash value, and since the ID information is unique on the blockchain network 11, the token included in the transaction has the hash value and the unique identification information. become.
Next, 3) a hash value of a document or the like record in which an OUTPUT using the INPUT is created and the node 10A is digitally signed using the recording private key A and the node 10B is digitally signed using the recording private key B ( The destination is the recording public key A and the recording public key B, including the hash value acquired in S88).
A signal (transaction) including these 1) to 3) is created and transmitted to all the nodes on the blockchain network 11 including itself.

Each node stores the transaction received in [0063] in the storage unit 22, and if the blockchain network 11 is a private chain, the operator verifies the contents of any of the other nodes 10C to F. It is confirmed by (S91). The verification contents are as follows.
First, verification that there is no change 1) The destination of the OUTPUT is the recording public key A and the recording public key B 2) The recording private key A and the recording public key B attached to the OUTPUT are used. The record public key A and the record public key B are calculated from the electronic signature, and the creator matches the record public key A and the record public key B with the known record public key A and the record public key B. Being the holders of the key B, node 10A and node 10B 3) There is no issue of tokens with identification information that is inseparably and uniquely linked to the records such as documents in OUTPUT, and there is a balance (unused). The fact that the token has a balance and is unused means that the token has identification information that is inseparably and uniquely linked to the document record, so that the document record is the sender. It was created and transmitted at the will of node 10A and node 10B, and it was verified that it was not changed by a third party.)
Secondly, the electronic signature A and the electronic signature B attached to the hash value of the document record are verified (same as in 2 above), and the hash value of the document record is restored by the distributed system 12. The document record has the same content as the document record known in advance.

According to [0058] to [0065], the document records created by the nodes 10A and 10B are created and transmitted by the nodes 10A and 10B by any of the nodes, recorded in all the nodes, and revised at the time of verification. In addition to not being done, an electronic signature created with a private key for recording that is paired with the public key for recording that was genuinely created by nodes A and B, which are the authentication public key holders authenticated by the public key authentication platform. Can be verified that is attached to the records such as documents. If node 10A and node 10B are contracting parties, the latest contract details can be immediately confirmed between related companies participating in the blockchain network 11, and the public key is recorded in documents such as the contract. By verifying that the electronic signature is attached based on the authentication platform, the authenticity of documents and other records can be estimated.

10 Information processing system (consisting of a blockchain network and a distributed system, and a plurality of nodes of the blockchain network having a communication unit between the blockchain network and the distributed system)
10 A, B, C, D, E, F Blockchain network nodes (including communication unit with distributed system) 11 Blockchain network 12 Distributed system 13 Another blockchain network 14 Processing unit at node 15 Communication at node Part 20 Computer in node 21 CPU 22 Storage part 23 Memory 24 I / F 25 R / W part 26 Blockchain network I / F 27 Distributed system I / F
28 Platform Bus S41-S91 Information Processing Steps (“Step” is abbreviated as “S”)

Claims (7)

A node that has an information processing device that stores document records
On a blockchain network where an agreement is made to keep the same document record on other nodes
In the transaction to broadcast
A token having identification information that is inseparably and uniquely linked to the document record is created by a method in which the node refers to a transaction including a token on the unused blockchain network that has been separately received in advance.
Broadcast the transaction including the document record and the withdrawal of the token to all creators of the document record, and each node on the blockchain network provides identification information that is inseparably and uniquely linked to the document record. An information processing system characterized by including a step of storing a token to have. The identification information that is inseparably and uniquely linked to the document record,
In the transaction to broadcast
Further including a step of creating by referring to the ID information of the transaction including the unused token on the blockchain network received separately by the node in advance and the numerical value indicating the order within the transaction.
The information processing system according to claim 1. The identification information that is inseparably and uniquely linked to the document record,
When the creator of the document record is the node and another node or a plurality of other nodes.
In the transaction to be broadcast
Disclosure attached to a transaction in which the node issues a token on the unused blockchain network that has been separately received in advance to itself and all the nodes involved in the creation (the other node or the other plurality of nodes). The information processing system according to claim 1, further comprising a step of creating by referring to the key itself or the data created from the public key. A system for converting the document record into a hash value for each record is provided outside the blockchain network, further including a step in which the hash value can be transactionally quoted from the system in the blockchain network.
The information processing system according to any one of claims 1 to 3. In the transaction including the document record, the step of referring to the transaction including the document record before the change created in the blockchain network, or the hash value of another document record created outside the blockchain network is used as the document. Including additional steps to include in the record,
The information processing method system according to any one of claims 1 to 4. The node, the other node, and the other plurality of nodes
An electronic certificate is attached to the public key (public key for recording) created as the holder of the public key (authentication public key) authenticated by the electronic certificate based on the public key authentication platform from the system provided outside the blockchain network. Further includes a step in which the electronic signature created by using the private key (recording private key) paired with the recording public key is taken in and the electronic signature can be included in the transaction in the blockchain network.
The information processing system according to any one of claims 1 to 5. The address of the node participating in the bookchain network, the address of the destination node, the hash value of the document record created outside the blockchain network, and the identification information that is inseparably and uniquely linked to the document record. includes a token having, a method for processing block chain data structure transaction, is recorded to refer to the transaction including the written record of previous changes made in the block chain network,
Every node participating in the blockchain network verifies that the information processing device has not used, that is, has issued a token having identification information that is inseparably and uniquely linked to the document record. By doing so, it is used to confirm that the document record has not been changed by any node that is the document creator to whom the token is issued, with reference to the document record before the change.
How to handle blockchain data structures.

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