JP2018032080A - Custody support system and custody support method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a custody support system and a custody support method for supporting custody business in a security transaction by a non-resident.SOLUTION: In the custody support system, an investment management system 10 accessible to distributed ledgers, an overseas securities company system 20, a sub-custodian system 40, a domestic securities company system 50 and a CSD system 60 use a base system which can confirm the validity of virtual currency by block chains. When a transaction with domestic securities as a transaction object is contracted between an investor and an overseas securities company, the investment management system 10 registers virtual currency that records contract information and tying information in a distributed ledger. Then, the CSD system 60 confirms transaction contents on the basis of the virtual currency recorded by the domestic securities company system 50, settles a securities transaction, and registers the virtual currency that records transfer completion information and the tying information (transaction identification information) of the transaction object in the distributed ledger.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a custody support system and a custody support method for supporting a custody service in a securities transaction by a non-resident.

  When non-residents such as overseas investors and securities companies trade domestic securities, they use custody services provided by banks and securities companies. For example, if a sales contract is concluded between an overseas resident investor and an overseas branch office of a domestic securities company for the purchase and sale of domestic securities, the investor will give the foreign custodian a purchase order (delivery of the securities accompanying the securities sale). Instructions). Then, the instruction is transmitted to a domestic bank or the like that performs custody work. Here, the bank receives instructions from business partners such as overseas custodians via a SWIFT system (SWIFT: The Society for Worldwide Interbank Financial Tele-communication). A custody support method for realizing efficient and rapid processing for such instruction data has been studied (for example, see Patent Document 1).

JP 2002-245250 A

  In securities transactions involving non-residents, multiple settlement parties are involved in the transaction. In this case, since the contents of the settlement instruction are individually confirmed, it takes a cumulative time for the confirmation processing. In particular, when there are many items included in the settlement instruction, a process for determining the appropriateness of the contents of each item is necessary, and the processing load is large.

  On the other hand, it is conceivable for specific institutions to concentrate and manage the contents of securities transactions. However, it is necessary to construct a system for a centrally managed organization. Furthermore, the volume of securities transactions is enormous, and the economic burden for constructing this system increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a custody support system and a custody support method for supporting custody work in securities transactions involving non-residents. .

  The custody support system that solves the above-mentioned problems is that the investor's investment management system, overseas securities company system, custodian system, domestic securities company system, and securities storage system can access the distributed ledger. Support the trading of domestic securities by using the infrastructure system that can confirm the validity. Here, when a transaction for domestic securities is executed between an investor and an overseas securities company, the investment management system registers a virtual currency in which the execution information and transaction identification information are recorded in the distributed ledger. The custodian system confirms the transaction content based on the acquired transaction identification information of the virtual currency, and registers the virtual currency in which the transaction target balance confirmation information and the transaction identification information are recorded in the distributed ledger, The overseas securities company system registers a virtual currency recording the balance confirmation information and transaction identification information of the transaction target in the distributed ledger, and the domestic securities company system is based on the acquired transaction identification information of the virtual currency. The transaction content is confirmed, the virtual currency in which the confirmation information of the balance of the transaction object and the transaction identification information are recorded is registered in the distributed ledger. Company is based on the virtual currency that was recorded to confirm the transaction content, it performs the settlement of the transaction, to register the virtual currency that records the transaction transfer completion information and transaction identification information of the target in the dispersion ledger.

  Thereby, it is possible to support the custody service using the infrastructure system that can confirm the validity of the virtual currency using the block chain.

  According to the present invention, it is possible to support custody work in securities transactions involving non-residents.

The system schematic of embodiment of this invention. Explanatory drawing of the virtual currency used in this embodiment. FIG. 3 is an explanatory diagram of a hardware configuration example. Explanatory drawing of the process sequence of this embodiment. Explanatory drawing of the process sequence of this embodiment. Explanatory drawing of the process sequence of this embodiment.

  An embodiment embodying a custody support system will be described below with reference to FIGS. In the present embodiment, the custodian (institution that manages securities on behalf of an investor) is used to support a custodian service for dealing with non-residents. Here, it is assumed that an investor, an overseas asset management company, an overseas securities company, a domestic securities company, an investor custodian, and a CSD (Central Securities Depository) are used as settlement parties. This transaction consists of an investor side called a buy side and a broker side called a sell side. And. In the present embodiment, it is assumed that a custody service is supported using a base system that can confirm the validity of a virtual currency using a block chain.

  FIG. 1 shows a typical configuration. The custody support system includes a plurality of related party systems related to securities transactions. In this embodiment, the investment management system 10, the overseas securities company system 20, the domestic securities company system 50, the global custodian system 30, the sub custodian system 40, and the CSD system 60 are included as related party systems.

  The investment management system 10 to the CSD system 60 are connected by a peer-to-peer network. This peer-to-peer is one of the architectures for performing communication between a large number of systems, and is a communication system infrastructure system in which peers communicate with each other. For example, a block chain method can be used to prevent falsification of information. In the block chain method, “blocks” that summarize “records of transactions” are sequentially added in a “chain” shape. Each block constituting the block chain includes a “header” including information on the block and the previous block, and a “transaction” in which a list of transactions performed within a certain time is recorded. Since all transaction records from the past are recorded in the block chain, if fraud is attempted, all blocks after the fraud must be rewritten, resulting in a large calculation load and making alteration difficult. Each system connected to the peer-to-peer network shares and transmits information transmitted by one peer. In the present embodiment, each system shares a virtual currency in which information about securities transactions is recorded.

  Each of the investment management systems 10 to CSD system 60 holds a distributed ledger (distributed ledger) that stores information shared in the peer-to-peer network. When predetermined information is written in the distributed ledger of one system, the same distributed information is written in the distributed ledger held by all other systems by the peer-to-peer network.

  Therefore, the investment management system 10 to the CSD system 60 each include a transaction confirmation unit M1 and an information storage unit M2. The transaction confirmation unit M1 writes the virtual currency written in the information storage unit M2 of its own system to the distributed ledger of the information storage unit M2 of the other system connected to the network by peer-to-peer.

  Further, the transaction confirmation unit M1 of the related party system holds information in which a key and association information are recorded for each transaction. This key is information for decrypting the information encrypted in this transaction. The association information is identification information (transaction identification information) for acquiring a series of transactions related to this transaction using a plurality of virtual currencies.

  The investment management system 10 is a computer system of an overseas management company that manages transactions of investors (non-residents) who wish to trade domestic securities overseas. This investment management system 10 has information for managing its own securities account and fund account held by the overseas custodian in the global custodian, which is a subordinate account management institution (stock account number, fund account number, account of each account) Balance). Further, the investment management system 10 has a function of confirming whether or not the content of the instruction has been altered in the process from the global custodian system 30 to the CSD system 60, which are subordinate account management institutions, using this distributed ledger. Prepare.

  The overseas securities company system 20 is a computer system managed by an overseas securities company that supports securities transactions based on a contract with an overseas manager. This overseas securities company system 20 has information for managing its own securities account and fund account held by a domestic securities company that is a subordinate account management institution of the overseas securities company (securities account number, fund account number, Account balance). Furthermore, the overseas securities company system 20 has a function of confirming whether or not the contents of the instruction have been altered in the process from the domestic securities company system 50 to the CSD system 60, which are subordinate account management institutions, using this distributed ledger. Prepare.

  The global custodian system 30 is a computer system managed by a global custodian of an overseas management company. This global custodian system 30 has information for managing a securities account and a fund account held by a sub custodian who is a subordinate account management institution of the global custodian (securities account number, fund account number, account balance of each account). Etc.). The global custodian system 30 transmits a contract message to the sub-custodian system 40 based on the contract message acquired from the investment management system 10.

  The sub-custodian system 40 is a computer system managed by the sub-custodian. This sub-custodian system 40 is a securities account held by a substituting institution that is a subordinate account management institution, information for managing a fund account (securities account number, fund account number, account balance of each account, etc.) ). The sub-custodian system 40 transmits a settlement instruction to the CSD system 60 based on the contract message acquired from the global custodian system 30.

  The domestic securities company system 50 is a computer system managed by a participating company of an exchange where the securities to be traded are traded. This domestic securities company system 50 is a securities account held by a domestic securities company in a subordinate account management institution, information for managing a fund account (securities account number, fund account number, account balance of each account, etc.) ).

  The CSD system 60 is a computer system (stock storage system) of a securities centralized storage organization (CSD) that performs securities settlement. For example, as a CSD, there is a securities custody transfer organization that receives confirmation information on the buy side and the sell side for transactions between the buy side (eg, the sub-custodian system 40) and the sell side (eg, the domestic securities company system 50) To do. Then, the CSD system 60 performs DVP settlement of the transaction when the selling-side securities and the buying-side funds balance are satisfied.

  The verification organization system 100 is a computer system that performs contract verification for securities transactions between an overseas manager and an overseas securities company. In this contract verification, it is verified whether or not the recognitions of the two companies that deal with the contract content match.

  Next, the virtual currency used for the securities transaction will be described with reference to FIG. Here, a description will be given using colored coins based on an open asset protocol using a block chain as a virtual currency.

  Like the virtual currency C0, an empty area that can be used by the user is provided for the virtual currency main body. In the virtual currency body, original information of the virtual currency is recorded. Specifically, an address (remittance destination) used for a transaction using virtual currency, a remittance amount, a time, and the like are recorded. Then, information (transaction details, confirmation, approval, etc.) necessary for the transaction is recorded in the vacant area of the virtual currency. Further, in the empty area, association information for associating a series of transactions related to the transaction is recorded. By using this association information, a series of transactions performed in each transaction can be acquired. In the present embodiment, encrypted association information that is encrypted so as to be decrypted by a key described later is recorded.

  The virtual currency includes fixed information determined at contract time and variable information generated for each confirmation or approval operation. At the time of contract, virtual currencies C1 to C3 are generated. Further, when a confirmation operation is performed in each party system, a virtual currency C4 is generated, and when an approval operation is performed, a virtual currency C5 is generated. In the present embodiment, encrypted information encrypted so as to be decrypted by a key described later is recorded.

When the capacity of the free area is limited, the fixed information is divided into a plurality of pieces. Here, like the virtual currencies C1 to C3, at the time of the contract, the fixed information is divided into three, and three virtual currencies each recording the contract information, the reference route information, and the approval route information are generated. The contract information includes a transaction identifier, a contract date, a settlement date, linkage with other transactions, securities type, brand code, number of securities, information on settlement amount, and other necessary information.
Data relating to an identifier for identifying each transaction is recorded in the transaction identifier data area.
In the execution date data area, data related to the execution date (date) is recorded.

In the settlement date data area, data relating to the date of settlement for this transaction is recorded.
In the linkage data area with other transactions, data relating to an identifier for specifying a transaction that is performed simultaneously or in sequence with the transaction is recorded.

In the securities type data area, data relating to an identifier for specifying the type of securities is recorded.
In the brand code data area, data relating to an identifier for identifying the brand of the securities to be traded is recorded.
In the securities number data area, data relating to the quantity of securities to be traded is recorded.
In the settlement amount data area, data relating to the settlement amount in this transaction is recorded.
In the other necessary information data area, data related to information necessary for the transaction is recorded. For example, data relating to an identifier for determining whether or not the transaction needs to be held is recorded. Specifically, either a hold flag indicating a hold instruction, a release flag indicating a release instruction, or the like is recorded.

In the reference route information, information regarding a participant (referencer) who is permitted only to confirm the transaction is recorded. Here, identification information for specifying a global custodian, sub-custodian, foreign securities company, domestic securities company, etc. is recorded as a reference.
In the approval route information, information regarding a participant (approver) who can send back the transaction is recorded. Here, as the approver, identification information for identifying the securities custodian transfer organization is recorded.

Further, when the referrer performs a confirmation operation or when the approver performs an approval operation, a new virtual currency is generated.
Further, information regarding the account number of the securities account or the fund account used for the transaction is recorded in the vacant area of the virtual currency generated when the referrer performs the confirmation operation together with the confirmation information. These pieces of information are also recorded as encrypted information encrypted so that it can be decrypted by the key.

In the securities account number data area, data relating to an identifier for specifying an account for managing securities is recorded.
In the fund account number data area, data relating to an identifier for specifying an account used for fund settlement in this transaction is recorded.

Approval information is recorded in the empty area of the virtual currency generated when the approver confirms.
And the virtual currency produced | generated in the participant system is recorded on the distributed ledger of the information storage part M2 of each system via the peer-to-peer network mentioned above.

(Hardware configuration example)
FIG. 3 is a hardware configuration example of the information processing apparatus H10 that functions as the investment management system 10 to the CSD system 60 or the like.
The information processing device H10 includes a communication interface H11, an input device H12, a display device H13, a storage unit H14, and a processor H15. Note that this hardware configuration is an example, and other hardware may be included.
The communication interface H11 is an interface that establishes a communication path with another device and executes data transmission / reception, and is, for example, a network interface card or a wireless interface.

The input device H12 is a device that receives input from a user or the like, and is, for example, a mouse or a keyboard. The display device H13 is a display or a touch panel that displays various types of information.
The storage unit H14 is a storage device (for example, processing in the information storage unit M2) that stores data and various programs for executing various functions of the investment management system 10 to the CSD system 60. For example, the storage unit H14 stores the information shown in the information storage unit M2. Examples of the storage unit H14 include a ROM, a RAM, and a hard disk.

  The processor H15 controls each process (for example, a process in the transaction confirmation unit M1) in the investment management system 10 to the CSD system 60 using a program and data stored in the storage unit H14. Examples of the processor H15 include a CPU and an MPU. The processor H15 develops a program stored in the ROM or the like on the RAM and executes various processes corresponding to various processes. For example, the processor H15 operates a process for executing each process shown in FIGS.

  With reference to FIG. 4, a processing procedure in the case of supporting a securities transaction by a non-resident using the system configured as described above will be described. Here, it is assumed that an overseas resident (investor, securities company, etc.) wishes to purchase a domestic stock handled on an exchange (for example, Tokyo Stock Exchange) through an overseas manager.

  The investment management system 10 of the overseas management company executes order processing (step S101). Here, the investment management system 10 transmits buy order information to the overseas securities company system 20.

Next, the overseas securities company system 20 executes a volume notification process (step S102). Specifically, the overseas securities company system 20 notifies the transaction volume for the order.
And the collation organization system 100 which acquired transaction information from the investment management system 10 and the overseas securities company system 20 performs contract collation. Then, the collation institution system 100 transmits the confirmation result to the investment management system 10 and the overseas securities company system 20. Thereby, the investment management system 10 executes a verification result acquisition process (step S103), and the overseas securities company system 20 executes a verification result acquisition process (step S104).

  If the agreement can be verified, the investment management system 10 executes a writing process to the distributed ledger (step S105). Specifically, the transaction confirmation unit M1 of the investment management system 10 generates a virtual currency in which fixed information is recorded. Here, as fixed information, contract information, reference route information, and approval route information are encrypted so that they can be decrypted with a key, and a virtual currency recorded in each empty area is generated. Further, encrypted association information encrypted so as to be decrypted by the key is generated and recorded in the free area of each virtual currency. For the encryption of the association information, deterministic encryption in which the same number is converted into the same ciphertext is used. Then, the transaction confirmation unit M1 records the generated virtual currency in the distributed ledger of the information storage unit M2. Information recorded in the distributed ledger of this information storage unit M2 is shared also in the distributed ledgers of other information storage units M2.

  Next, the investment management system 10 executes a notification process to related parties (step S106). Specifically, the investment management system 10 notifies the related information (overseas securities company system 20 to CSD system 60) recorded in the reference route information and the approved route information of the association information and the key information. Each party system records the association information and key information acquired from the investment management system 10 for each transaction.

Then, each party system uses the association information to identify the virtual currency related to the current contract in the distributed ledger recorded in its information storage unit M2, and confirms the current state.
The investment management system 10 executes a contract communication process for the global custodian system 30 (step S107). This contract communication includes information related to the pegging information.

  In this case, the global custodian system 30 executes a confirmation process (step S108). Specifically, the global custodian system 30 identifies the virtual currency related to the current contract in the distributed ledger recorded in its information storage unit M2 using the association information, and confirms the current state. If the current situation can be confirmed, the global custodian system 30 temporarily holds the securities or funds balance of the overseas securities company that is the custodian customer. When the confirmation operation is performed, the transaction confirmation unit M1 of the global custodian system 30 encrypts the confirmation information that there is a balance with the key information and the same encrypted string as the virtual currency related to the contract. A virtual currency including attached information is generated and recorded in the distributed ledger of the information storage unit M2. The settlement instruction is transmitted by setting the address of the sub-custodian system 40 in the main part of the virtual currency.

  Next, the sub custodian system 40 executes a balance confirmation process (step S109). Specifically, using the association information, the virtual currency related to the current contract is specified in the distributed ledger recorded in the information storage unit M2, and the current state is confirmed. If the current status can be confirmed, the sub-custodian system 40 temporarily holds the securities or funds balance of the global custodian. When the confirmation operation is performed, the transaction confirmation unit M1 of the sub-custodian system 40 includes confirmation information that there is a balance, information obtained by encrypting the account information with the key information, and the same encrypted linking information. A virtual currency is generated and recorded in the distributed ledger of the information storage unit M2. The transfer instruction is transmitted by setting the address of the CSD system 60 in the main part of the virtual currency.

  Also, the overseas securities company system 20 that has acquired the verification completion information executes order processing (step S110). Specifically, order information is transmitted to the domestic securities company system 50. This order information includes information related to the association information.

  The domestic securities company system 50 that has acquired the order information from the overseas securities company system 20 executes a balance confirmation process (step S111). Specifically, using the association information, the virtual currency related to the current contract is specified in the distributed ledger recorded in the information storage unit M2, and the current state is confirmed. If the current status can be confirmed, the domestic securities company system 50 temporarily holds the securities or funds balance of the overseas securities company. When the confirmation operation is performed, the transaction confirmation unit M1 of the domestic securities company system 50 includes confirmation information that there is a balance, information obtained by encrypting the account information with the key information, and the same encrypted linking information. A virtual currency is generated and recorded in the distributed ledger of the information storage unit M2.

  Then, the CSD system 60 executes a status confirmation process (step S112). Specifically, the CSD system 60 identifies the virtual currency related to the current contract in the distributed ledger recorded in its information storage unit M2 using the association information, and confirms the current state. Here, the virtual currency in which the confirmation in the sub-custodian is recorded and the virtual currency in which the confirmation at the domestic securities company is recorded are confirmed. If the current status can be confirmed, the transaction confirmation unit M1 of the CSD system 60 generates a virtual currency including the information obtained by encrypting the status confirmation information of the sub-custodian and domestic securities company using the key information and the same encrypted linkage information. And recorded in the distributed ledger of the information storage unit M2.

  Next, the domestic securities company system 50 executes a transfer instruction process (step S113). Specifically, the domestic securities company system 50 identifies the virtual currency related to the current contract in the distributed ledger recorded in its information storage unit M2 using the association information, and confirms the current state. When the contents of the instruction are valid and there is a balance, and the current status can be confirmed, the domestic securities company system 50 temporarily presses the balance. When the approval operation is performed, the transaction confirmation unit M1 of the domestic securities company system 50 generates virtual currency including information obtained by encrypting the completion information with the key information and the same encrypted association information, and storing the information. Record in the distributed ledger of part M2.

  Next, the CSD system 60 executes an instruction matching process (step S114). Specifically, the CSD system 60 collates the transfer instruction of the domestic securities company with the initial instruction. When the instruction content of the domestic securities company is valid and there is a balance, the transaction confirmation unit M1 of the CSD system 60 encrypts the completion information for instructing the transfer with the key information and the same encrypted association information. Is generated and recorded in the distributed ledger of the information storage unit M2.

Here, if there is a mismatch, the CSD system 60 executes a reconfirmation process (step S115). This process will be described later with reference to FIG.
If the transfer instruction matches the initial instruction, the CSD system 60 executes a settlement process (step S116). Specifically, the CSD system 60 transfers balances between accounts of participants (sub-custodians and domestic securities companies) based on the virtual currency recorded in the distributed ledger of the information storage unit M2 by DVP (Delivery Versus Payment). Then, the transaction confirmation unit M1 of the CSD system 60 generates a virtual currency including the transfer completion information, the information obtained by encrypting the association information with the key information, and the same encrypted association information, and the distribution of the information storage unit M2 Record in the ledger.

  In this case, the sub-custodian system 40 performs transfer from the global custodian fund account to the sub-custodian fund account for the settlement amount of the virtual currency contract information. Furthermore, the global custodian system 30 transfers the settlement amount of the virtual currency contract information from the fund account of the overseas management company to the fund account of the global custodian. Further, the domestic securities company system 50 transfers the settlement amount of the virtual currency contract information from the domestic securities company fund account to the overseas securities company fund account. Then, the overseas securities company system 20 executes transfer of the settlement amount of the virtual currency contract information from the account of the overseas securities company to the account of the overseas manager.

(Current status confirmation process using distributed ledger)
The current status confirmation process by the distributed ledger will be described with reference to FIG. This process is executed by the transaction confirmation unit M1 in each party system.

First, the transaction confirmation unit M1 executes a process for specifying the association information to be confirmed (step S201). Specifically, the transaction confirmation unit M1 acquires the association information of the transaction to be confirmed input by the operator in each party system.
Next, the transaction confirmation unit M1 executes a process for generating encrypted association information (step S202). Specifically, the transaction confirmation unit M1 specifies key information associated with the association information. And the transaction confirmation part M1 produces | generates the encryption link information which encrypted link information using key information.

  Next, the transaction confirmation unit M1 searches for a series of virtual currencies using the encrypted association information and executes an extraction process (step S203). Specifically, the transaction confirmation unit M1 searches the distributed ledger of the information storage unit M2 for a virtual currency in which the generated encrypted association information is recorded. Then, the transaction confirmation unit M1 extracts all the virtual currencies in which the encryption association information is recorded from the distributed ledger.

  Next, the transaction confirmation unit M1 performs a decryption process on the acquired virtual currency using the key information (step S204). Specifically, the transaction confirmation unit M1 decrypts the information recorded in the vacant area of the virtual currency using the key information.

  Next, the transaction confirmation unit M1 executes a series of transaction specifying processes using the decrypted virtual currency (step S205). Specifically, the transaction confirmation unit M1 acquires a series of transactions in the transaction associated with the association information based on the decrypted information.

  Then, the transaction confirmation unit M1 performs transaction confirmation processing by a series of transactions (step S206). Specifically, it is confirmed whether there is any inconsistency in a series of transactions. And transaction check part M1 outputs a check result (presence of inconsistency) to a display.

(Reconfirmation process when there is a mismatch)
Next, the reconfirmation process (step S115) when there is a mismatch in the match between the transfer instruction and the initial instruction will be described with reference to FIG.

  When a mismatch is detected (step S301), the CSD system 60 executes a return process (step S302). Specifically, the CSD system 60 inputs the reason for return along with the return information. In this case, the transaction confirmation unit M1 of the CSD system 60 generates virtual currency including information obtained by encrypting the return information and the reason for the return using the key information and the same encrypted association information, and stores the virtual currency in the distributed ledger of the information storage unit M2. Record.

Next, the domestic securities company system 50 executes a rebooking process (step S303). Specifically, the domestic securities company system 50 temporarily holds the balance for a transfer instruction. Then, the transaction confirmation unit M1 of the domestic securities company system 50 generates a virtual currency including the information obtained by encrypting the completion information with the key information and the same encrypted linking information, and records the virtual currency in the distributed ledger of the information storage unit M2. .
Next, the CSD system 60 executes the instruction matching process again as in step S114 (step S304).

According to this embodiment, the following effects can be obtained.
(1) In this embodiment, the related party system executes a writing process to the distributed ledger. In this distributed ledger, virtual currency including contract information is recorded. Further, even when the confirmation operation or the approval operation is performed, the virtual currency in which the confirmation information and the approval information are recorded is recorded in the distributed ledger. By using the association information in the distributed ledger, all parties involved in the transaction can confirm a series of transactions regarding the contract contents, approval, and confirmation. Then, the distributed ledger technology using blockchain can provide a quick and efficient custody service in which the contents of the contract are unchanged and the collation of the instructions is easy.

  (2) In this embodiment, an open asset protocol (colored coin) that uses a block chain of bit coins is used as a virtual currency for custody support. Unlike the case of constructing a dedicated system for supporting custody, the cost and time of system construction can be reduced by using an existing virtual currency, and a widely distributed base system can be used. And even if fraud such as tampering is performed, it is possible for all the parties involved in the settlement to immediately recognize the fraud.

  (3) In the present embodiment, at the time of the contract, a virtual currency in which the reference route information and the approved route information are recorded is generated. As a result, the settlement route is designated at the time of contract input, and outsiders who are not designated are excluded from the settlement flow. Furthermore, information such as association information, contract details, and account information recorded in the vacant area of the virtual currency is encrypted. Thereby, outsiders other than those related to payment cannot be deciphered, and security can be ensured.

  (4) In this embodiment, the CSD system 60 performs reconfirmation processing (step S115). In this case, the transaction confirmation unit M1 of the CSD system 60 generates a virtual currency including the return information and the reason for return, and records it in the distributed ledger of the information storage unit M2. Thereby, it is possible to share the reason for return by all the persons concerned with payment.

In addition, you may change the said embodiment as follows.
In the above embodiment, it is assumed that an open asset protocol (colored coin) using a bit coin block chain is used as a virtual currency. Virtual currency is not limited to colored coins. It is possible to use a platform system that has the main purpose of having a role / function other than currency, using a block chain other than Bitcoin.

  In the above embodiment, the encryption association information is recorded in the vacant area of the virtual currency. For encryption of the association number, deterministic encryption is used in which the same number becomes the same ciphertext. Instead of this, the association information may be recorded in an empty area of the virtual currency without being encrypted. Also in this case, information regarding the contract information and account information is encrypted. When the link information to be confirmed is specified, a series of virtual currencies in which the link information is recorded is acquired from the distributed ledger in the information storage unit M2. Then, the information recorded in the virtual currency is decrypted using the key information. As a result, it is possible to efficiently extract a series of virtual currencies using the unencrypted association information and confirm whether or not tampering has occurred. Furthermore, since the information related to the contract information and the account information is encrypted, it is impossible for an outsider to decipher it, and security about the specific contents related to the transaction can be ensured.

In the above embodiment, information relating to the association information is recorded in the empty area of the virtual currency. The association information may be any information that can extract a plurality of virtual currencies, and numbers, English letters, symbols, and the like can be used.
In the above embodiment, at the time of the contract, the fixed information is divided into three, and three virtual currencies in which the contract information, the reference route information, and the approval route information are recorded are generated. The number of virtual currencies is not limited to three, and may be determined according to the capacity of the free area.

Next, technical ideas that can be grasped from the above-described embodiment and other examples will be described below together with their effects.
(A) A custody support system and a custody support method characterized by using colored coins as virtual currency.
Thereby, the validity of a virtual currency can be confirmed with a block chain using a colored coin, and a custody service can be supported.

(B) A custodian support system and a custodian support method, wherein the custodian system includes a global custodian system and a sub-custodian system.
Thereby, the custodian service can be supported by the global custodian and the sub custodian.

  10 ... Investment management system, 20 ... Overseas securities company system, 30 ... Global custodian system, 40 ... Sub-custodian system, 50 ... Domestic securities company system, 60 ... CSD system, 100 ... Verification system, M1 ... Transaction confirmation department, M2: Information storage unit.

Claims (5)

Investor's investment management system, overseas securities company system, custodian system, domestic securities company system, securities storage system can access the distributed ledger,
A custody support system that supports trading of domestic securities using a basic system that can confirm the validity of virtual currency by blockchain,
When a transaction involving domestic securities is executed between an investor and an overseas securities company, the investment management system registers a virtual currency in which the execution information and transaction identification information are recorded in the distributed ledger,
The custodian system confirms the transaction content based on the acquired transaction identification information of the virtual currency, and registers the virtual currency in which the transaction target balance confirmation information and the transaction identification information are recorded in the distributed ledger,
The overseas securities company system registers a virtual currency in which the transaction balance information and transaction identification information are recorded in the distributed ledger,
The domestic securities company system confirms the transaction content based on the acquired transaction identification information of the virtual currency, registers the virtual currency in which the transaction target balance confirmation information and transaction identification information are recorded in the distributed ledger,
The securities storage system confirms the transaction content based on the virtual currency registered by the domestic securities company system, settles the transaction, and stores the virtual currency in which the transaction completion information and transaction identification information are recorded. A custody support system characterized by being registered in a distributed ledger.   The investor's investment management system, the overseas securities company system, the custodian system, the domestic securities company system, and the securities storage system acquire all the virtual currencies in which the transaction identification information is recorded from the distributed ledger. The custody support system according to claim 1, wherein the validity of the transaction content included in the acquired empty area of the virtual currency is confirmed.   The investment management system encrypts the contract information, records it in virtual currency, and decrypts the encrypted contract information into key information for the overseas securities company system, the custodian system, and the domestic securities company system. The custody support system according to claim 1, wherein the custody support system is transmitted to the securities storage system.   The said securities storage system WHEREIN: When the collation of transaction content cannot be performed, the virtual currency which recorded the return information of the instruction | indication is registered into the said distributed ledger, The Claims 1-3 characterized by the above-mentioned. Custody support system. Investor's investment management system, overseas securities company system, custodian system, domestic securities company system, securities storage system can access the distributed ledger,
A method for supporting a custody service using a custody support system that supports trading of domestic securities using a base system capable of confirming the validity of a virtual currency using a block chain,
When a transaction involving domestic securities is executed between an investor and an overseas securities company, the investment management system registers a virtual currency in which the execution information and transaction identification information are recorded in the distributed ledger,
The custodian system confirms the transaction content based on the acquired transaction identification information of the virtual currency, and registers the virtual currency in which the transaction target balance confirmation information and the transaction identification information are recorded in the distributed ledger,
The overseas securities company system registers a virtual currency in which the transaction balance information and transaction identification information are recorded in the distributed ledger,
The domestic securities company system confirms the transaction content based on the acquired transaction identification information of the virtual currency, registers the virtual currency in which the transaction target balance confirmation information and transaction identification information are recorded in the distributed ledger,
The securities storage system confirms the transaction content based on the virtual currency registered by the domestic securities company system, settles the transaction, and stores the virtual currency in which the transaction completion information and transaction identification information are recorded. A custody support method characterized by registering in a distributed ledger.