Fund custody transaction method and system

Abstract

The present invention discloses a fund escrow transaction method and system, which relates to the field of secure transactions. The method includes: a fund escrow terminal authorizing and agreeing to transfer agreed funds from a payer's account to a fund escrow account and locking the funds based on a transfer request from a payer's terminal; based on the agreed service execution status and after completion, the fund escrow terminal unlocks the agreed funds in the fund escrow account according to an unlocking request from the payer's terminal; and the fund escrow terminal transferring the unlocked funds in the fund escrow account to the payee's account based on a payment request from a payee's terminal. The present invention implements fund escrow through the fund escrow terminal, does not require the involvement of a third-party financial institution, has a simple and convenient process, can effectively ensure the normal progress of transactions, and avoid disputes.

Description

Technical Field

[0001] The present invention relates to the field of secure transactions, and in particular to a fund custody transaction method and system. Background Art

[0002] In daily economic activities, some transactions span a long timeframe. To protect the interests of both parties, escrow is often necessary. For example, when Party A invests in Party B's construction, freight, or other services, disagreements often arise regarding when to pay. If payment is made before the services are completed, Party A may worry that Party B will not provide subsequent services or may compromise the quality of the services. If payment is made after the services are completed, Party B may worry that Party A will not pay as agreed, resulting in a loss of value for the services. Another example is real estate transactions, which require procedures such as loan processing and property transfers, which can take a long time. Consequently, disputes often arise between buyers and sellers regarding whether to transfer ownership or pay the purchase price first.

[0003] To address these issues, a common approach is for both parties to engage a bank as a third party and open a dedicated escrow account. The buyer deposits the funds to be paid into the escrow account. Once the transaction is complete, both parties sign a joint authorization to transfer the escrowed funds to the seller. However, this approach is complex and typically requires going to a bank counter. Banks generally only offer this service for larger transactions. Small, high-frequency transactions, common in everyday life, can only be conducted based on trust between the two parties. This often leads to transactions being abandoned due to a lack of trust, or disputes arising from dishonesty on the part of one party. Summary of the Invention

[0004] In response to the defects existing in the prior art, the purpose of the present invention is to provide a fund custody transaction method and system, which realizes the custody of funds through a fund custody terminal without the involvement of a third-party financial institution. The process is simple and convenient, and can effectively ensure the normal progress of transactions and avoid disputes.

[0005] To achieve the above objectives, the present invention provides a fund custody transaction method, which specifically includes the following steps:

[0006] Based on the transfer request from the payer terminal, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer account to the fund escrow account and locks the funds;

[0007] Based on the agreed service execution status and after the execution is completed, the fund escrow terminal unlocks the agreed funds in the fund escrow account according to the unlocking request of the payer terminal;

[0008] Based on the payment request from the payee terminal, the fund escrow terminal transfers the unlocked payment funds in the fund escrow account to the payee account.

[0009] Based on the above technical solution, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the fund escrow account and locks the funds based on the transfer request from the payer's terminal. The specific steps include:

[0010] Based on the near-field communication method, the fund custody terminal establishes a connection with the payer terminal;

[0011] Based on digital signature technology, the fund custody terminal completes identity authentication with the payer terminal;

[0012] The fund escrow terminal receives a transfer request initiated by the payer terminal, wherein the transfer request includes the agreed fund information;

[0013] Based on the transfer request, the fund custody terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding fund custody account and lock it.

[0014] Based on the above technical solution, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding fund escrow account and lock it based on the transfer request. The specific steps include:

[0015] Based on the transfer request, the fund escrow terminal transfers the agreed funds from the payer's account to the fund escrow account corresponding to the fund escrow terminal;

[0016] The fund custody terminal prompts whether to lock the funds, and waits for the payer to confirm the fund lock by pressing the physical button on the fund custody terminal to lock the funds transferred to the fund custody account.

[0017] Based on the above technical solution, before the funds escrow terminal unlocks the agreed funds in the funds escrow account according to the unlocking request of the payer terminal, the method further includes:

[0018] The fund escrow terminal receives a connection request initiated by the payer terminal;

[0019] The fund escrow terminal displays the connection request sent by the payer terminal;

[0020] The funds custody terminal responds to the payee's connection confirmation via the physical button on the funds custody terminal;

[0021] Based on the near-field communication method, the fund custody terminal establishes a connection with the payer terminal;

[0022] The funds escrow terminal receives the unlocking request sent by the payer terminal.

[0023] Based on the above technical solution, the funds escrow terminal unlocks the agreed funds in the funds escrow account according to the unlocking request of the payer terminal. The specific steps include:

[0024] The fund escrow terminal receives the unlocking request sent by the payer terminal;

[0025] Based on digital signature technology, identity authentication is performed between the fund escrow terminal and the payer terminal. After the authentication is passed, the fund escrow terminal will prompt whether to unlock the funds;

[0026] The payee confirms whether to unlock the funds and unlocks the agreed funds in the fund escrow account.

[0027] Based on the above technical solution, before the fund escrow terminal transfers the unlocked receiving funds in the fund escrow account to the payee's account based on the receiving request of the payee terminal, the following steps are also included:

[0028] The fund custody terminal receives the connection request sent by the payee terminal;

[0029] The fund escrow terminal displays the connection request sent by the payee terminal;

[0030] The funds custody terminal responds to the payee's connection confirmation via the physical button on the funds custody terminal;

[0031] Based on the near-field communication method, the fund custody terminal establishes a connection with the payee terminal;

[0032] The fund escrow terminal receives the payment request sent by the payee terminal.

[0033] Based on the above technical solution, the fund escrow terminal transfers the unlocked funds in the fund escrow account to the payee's account based on the payee's terminal's payment request. The specific steps include:

[0034] The fund escrow terminal receives the payment request sent by the payee terminal and displays the transfer amount and the payee's account information;

[0035] The funds custody terminal responds to the payee's confirmation of the transfer via the physical button of the funds custody terminal;

[0036] The unlocked funds in the fund escrow account are transferred to the payee's account.

[0037] On the basis of the above technical solutions,

[0038] When the received funds are equal to the agreed funds, the unlocked received funds in the funds escrow account are transferred to the payee's account, specifically: all the agreed funds unlocked in the funds escrow account are transferred to the payee's account;

[0039] When the received funds are not equal to the agreed funds, the unlocked received funds in the funds escrow account are transferred to the payee's account, specifically: for the unlocked agreed funds in the funds escrow account, the funds equal to the amount of received funds are transferred to the transfer-to payee's account, and the remaining amount of funds are transferred to the transfer-to payee's account;

[0040] Among them, when the collected funds are not equal to the agreed funds, the agreed funds are greater than the collected funds.

[0041] Based on the above technical solution, when there is no fund custody account:

[0042] The payer terminal transfers the agreed funds to the offline electronic wallet set up in the fund custody terminal, and locks the agreed funds by locking the fund custody terminal;

[0043] Based on the agreed service execution status and after the execution is completed, the unlocking fund custody terminal will unlock the agreed funds, and then transfer the received funds to the payee terminal.

[0044] The present invention provides a fund custody transaction system, comprising a payer terminal, a payee terminal and a fund custody terminal;

[0045] The payer terminal is used to send a transfer request and an unlock request to the fund custody terminal;

[0046] The payee terminal is used to send a payment request to the fund custody terminal;

[0047] The funds escrow terminal is used to receive a transfer request sent by the payer terminal, transfer the agreed funds from the payer's account to the funds escrow account and lock them, receive an unlock request sent by the payer terminal, unlock the agreed funds in the funds escrow account, and receive a collection request sent by the payee terminal, and transfer the unlocked collection funds in the funds escrow account to the payee's account.

[0048] Compared with the existing technology, the advantages of the present invention are: the funds custody terminal performs funds custody and locking based on the transfer request of the payer terminal, and then unlocks the funds in the funds custody account according to the unlocking request of the payer terminal, and transfers the unlocked funds in the funds custody account to the payee account based on the collection request of the payee terminal. The custody of funds is realized through the funds custody terminal without the participation of a third-party financial institution. The process is simple and convenient, which can effectively ensure the normal progress of transactions and avoid disputes. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0050] Figure 1 This is a flow chart of a fund custody transaction method according to an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the structure of a fund custody terminal in an embodiment of the present invention;

[0052] Figure 3 The figure is a schematic diagram of the structure of a fund custody trading system in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0054] See also Figure 1 As shown, an embodiment of the present invention provides a fund custody transaction method, which specifically includes the following steps:

[0055] S1: Based on the transfer request from the payer terminal, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer account to the fund escrow account and locks the funds;

[0056] In an embodiment of the present invention, the payer terminal and the payee terminal can be smart mobile devices, such as smart phones, tablet computers, etc., and the payer terminal and the payee terminal are both installed with corresponding APPs (Applications) to facilitate related operations with the fund custody terminal.

[0057] The payer terminal is kept by the payee; the payee terminal is kept by the payee; the fund custody terminal is initially kept by the payer. When the transfer agreed funds are transferred from the payer account to the fund custody account and locked, the fund custody terminal is kept by the payee.

[0058] The payer terminal corresponds to the payer account, the payee terminal corresponds to the payee account; the fund custody terminal corresponds to the fund custody account.

[0059] See also Figure 2As shown, the fund custody terminal is provided with a screen and physical buttons for human-computer interaction. A secure microcontroller is provided in the fund custody terminal as a central control unit. The secure microcontroller is used to store sensitive information, perform various cryptographic operations, external communications, logical control, etc.

[0060] In an embodiment of the present invention, based on the specific transaction content between the two parties, the two parties agree on a price, and before the transaction begins, the payer terminal sends a transfer request to the fund escrow terminal, and the agreed funds are transferred from the payer account to the fund escrow account and locked.

[0061] S2: Based on the agreed service execution status and after the execution is completed, the fund escrow terminal unlocks the agreed funds in the fund escrow account according to the unlocking request of the payer terminal; for example, the payer entrusts the payee to transport goods from place A to place B in a paid form, then when the payee transports the goods from place A to place B, the agreed service execution status is completed.

[0062] When the transaction between the two parties begins and is completed, the payer terminal sends an unlock request to the fund custody terminal to unlock the funds locked in the fund custody account.

[0063] S3: Based on the payment request from the payee terminal, the funds escrow terminal transfers the unlocked funds in the funds escrow account to the payee's account. The funds are locked and held in the funds escrow account. Once the transaction is complete, the locked funds in the funds escrow account are unlocked and transferred to the payee's account. This effectively prevents the payee from receiving the payment they deserve after their efforts, ensuring transaction fairness and effectively avoiding disputes.

[0064] In an embodiment of the present invention, the funds escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the funds escrow account and locks the funds based on the transfer request from the payer's terminal. The specific steps include:

[0065] S101: The fund escrow terminal establishes a connection with the payer terminal based on near-field communication; the near-field communication method may be Bluetooth connection communication.

[0066] The funds custody terminal is initially kept by the payer. When the two parties to the transaction agree on the price, the payer's terminal initiates a connection request to the funds custody terminal via Bluetooth connection. The funds custody terminal displays the connection request initiated by the payer's terminal and asks whether to run the connection. The payer authorizes and allows the Bluetooth connection through the physical button on the funds custody terminal.

[0067] S102: Using digital signature technology, the funds escrow terminal completes identity authentication with the payer terminal; that is, the payer terminal and the funds escrow terminal mutually authenticate each other to confirm that both are on a preset whitelist. This authentication ensures that only the payer terminal can subsequently unlock the locked agreed funds, effectively preventing malicious transfers of funds.

[0068] S103: The funds escrow terminal receives a transfer request initiated by the payer terminal, wherein the transfer request includes agreed funds information;

[0069] After the authentication between the payer terminal and the fund escrow terminal is passed, the payer terminal initiates a transfer request to the fund escrow terminal, and the transfer request includes the realization of the pre-agreed price.

[0070] S104: Based on the transfer request, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding fund escrow account and locks it.

[0071] In an embodiment of the present invention, based on a transfer request, the funds escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding funds escrow account and locks the funds. The specific steps include:

[0072] S1041: Based on the transfer request, the funds custody terminal transfers the agreed funds from the payer's account to the funds custody account corresponding to the funds custody terminal; that is, the agreed funds are transferred from the payer's account to the funds custody account through transfer.

[0073] S1042: The funds escrow terminal prompts whether to lock the funds, and waits for the payer to confirm the funds lock by pressing the physical button of the funds escrow terminal, thereby locking the funds transferred to the funds escrow account.

[0074] That is, after the agreed funds are transferred from the payer's account to the funds escrow account, the payer initiates a funds locking request to the funds escrow terminal through the payer's terminal. The funds escrow terminal displays the amount to be locked, and then prompts whether to lock the funds. The payer confirms the funds locking through the physical button of the funds escrow terminal, locks the funds in the funds escrow account, and then the payer hands over the funds escrow terminal to the payee for safekeeping. At this point, the funds are put into custody. The payer cannot transfer the funds in the funds escrow account because he does not have control of the funds escrow device. Although the payee has control of the funds escrow device, because the funds are locked by the payer, only the payer can unlock them, so the payee cannot transfer the funds in the funds escrow account.

[0075] In an embodiment of the present invention, after locking the funds transferred to the fund escrow account, the fund escrow terminal records the identity information of the payer terminal that initiated the transfer request and displays the amount and lock status of the funds in the fund escrow account. In other words, the fund escrow terminal records the identity of the device that initiated the fund lock request so that identity authentication can be performed later when unlocking the funds.

[0076] When the payer hands over the funds custody terminal to the payee for safekeeping, the payee can query information such as the amount of funds in the funds custody account, the lock status of the funds in the funds custody account, and the identity of the fund locker on the funds custody terminal.

[0077] In an embodiment of the present invention, before the funds escrow terminal unlocks the agreed funds in the funds escrow account according to the unlocking request of the payer terminal, the method further includes:

[0078] S201: The funds escrow terminal receives a connection request initiated by the payer terminal;

[0079] For example, the payer entrusts the payee to transport the goods. When the payee transports the goods to the destination, it indicates that the transaction content between the two parties has been completed.

[0080] When the transaction between the two parties is completed, the payer needs to unlock the funds locked in the fund escrow account. At this time, the payer and the payee meet, and the payer initiates a connection request to the fund escrow terminal through the payer terminal.

[0081] S202: The funds escrow terminal displays the connection request sent by the payer terminal;

[0082] S203: The funds escrow terminal responds to the payee's connection confirmation via a physical button on the funds escrow terminal;

[0083] S204: The funds escrow terminal establishes a connection with the payer terminal based on near field communication;

[0084] S205: The funds escrow terminal receives the unlocking request sent by the payer terminal.

[0085] In an embodiment of the present invention, the funds escrow terminal unlocks the agreed funds in the funds escrow account according to the unlocking request of the payer terminal. The specific steps include:

[0086] S211: The fund escrow terminal receives an unlocking request sent by the payer terminal;

[0087] S212: Based on digital signature technology, the fund escrow terminal and the payer terminal perform identity authentication. After the authentication is passed, the fund escrow terminal prompts whether to unlock the funds.

[0088] When the fund escrow terminal and the payer terminal perform identity authentication, they must also verify whether the unlocker and locker identities of the funds in the fund escrow account are the same.

[0089] S213: The payee confirms whether to unlock the funds, unlocking the agreed funds in the fund escrow account. That is, the payee confirms the unlocking by pressing the physical button on the fund escrow terminal, and then the funds in the fund escrow account are unlocked.

[0090] In an embodiment of the present invention, before the funds escrow terminal transfers the unlocked funds in the funds escrow account to the payee's account based on the payment request of the payee terminal, the following steps are further included:

[0091] S301: The funds escrow terminal receives a connection request sent by the payee terminal; that is, the payee sends a connection request to the funds escrow terminal via the payee terminal.

[0092] S302: The funds escrow terminal displays the connection request sent by the payee terminal;

[0093] S303: The funds escrow terminal responds to the payee's connection confirmation via a physical button on the funds escrow terminal;

[0094] S304: The fund escrow terminal establishes a connection with the payee terminal based on near field communication;

[0095] That is, when the payee confirms the connection through the physical button of the funds custody terminal, a connection is established between the payee terminal and the funds custody terminal.

[0096] S305: The fund escrow terminal receives the payment request sent by the payee terminal.

[0097] In the present invention, identity authentication is performed between the payer terminal and the fund escrow terminal, as well as between the payee terminal and the fund escrow terminal based on digital signature technology, which has higher security and convenience than traditional manual signature authorization.

[0098] In an embodiment of the present invention, the funds escrow terminal transfers the unlocked funds in the funds escrow account to the payee's account based on the payee's payment request. The specific steps include:

[0099] S311: The fund escrow terminal receives the payment request sent by the payee terminal and displays the transfer amount and the payee's account information; that is, the fund escrow terminal displays key information such as the transfer amount and the payee's account information.

[0100] S312: The funds escrow terminal responds to the payee's confirmation of the transfer via the physical button of the funds escrow terminal;

[0101] S313: The unlocked funds in the escrow account are transferred to the payee's account. At this point, the transaction is completed.

[0102] In this embodiment of the present invention, when the received funds equal the agreed funds, the transfer of the unlocked received funds in the funds escrow account to the payee's account specifically involves transferring all unlocked agreed funds in the funds escrow account to the payee's account. The received funds are the funds actually payable by the payer to the payee.

[0103] When the received funds do not equal the agreed funds, the transfer of the unlocked received funds from the escrow account to the payee's account will specifically involve transferring an amount equal to the unlocked agreed funds from the escrow account to the payee's account, and transferring the remaining amount to the payee's account. When the received funds do not equal the agreed funds, the agreed funds are greater than the received funds, and the multiple of the agreed funds and the received funds can be flexibly set as needed.

[0104] That is, in one possible scenario, after the payee completes the transaction-related service operations, the payer maliciously fails to unlock the funds in the fund escrow account. Although the payer cannot retrieve the funds in the fund escrow account, the payer does not incur additional losses compared to unlocking the funds. However, the payee pays for the service but cannot receive the escrowed funds, thus suffering a loss. Therefore, in the present invention, the agreed funds can be set to be greater than the received funds. When the agreed funds unlocked in the fund escrow account are transferred to the payee's account, funds equal to the received funds are transferred to the payee's account, and the remaining funds are transferred to the payee's account.

[0105] That is, the payee can require the payer to hold more funds in escrow than the actual funds payable to the payee when the funds are escrowed. When the funds are unlocked and the funds in the escrow account are transferred, the agreed funds in the escrow account after unlocking, equal to the amount of the received funds, are transferred to the payee's account, and the remaining amount is transferred to the payee's account. This operation is completed in one go, which means that the escrow funds will either succeed or fail in entering both accounts. There will be no situation where part of the funds are transferred to the payee's account while the remaining funds are not successfully returned to the payer's account, thus ensuring the interests of both parties to the transaction. In this way, if the payer maliciously fails to unlock the escrow funds, he will also suffer losses compared to normal unlocking, thereby promoting the payer's enthusiasm to unlock the escrow funds and ensuring the normal progress of the transaction.

[0106] Of course, in one possible implementation, funds may not be escrowed through a funds escrow account, that is, when there is no funds escrow account: the payer terminal transfers the agreed funds to an offline electronic wallet set up in the funds escrow terminal, and locks the agreed funds by locking the funds escrow terminal; then, based on the agreed service execution status and after the execution is completed, the funds escrow terminal is unlocked to unlock the agreed funds, and then the collected funds are transferred to the payee terminal.

[0107] This allows for the transfer of funds through an offline electronic wallet, enabling operations such as fund custody and transfer without relying on the internet. It should be noted that when no funds escrow account exists, the payer's terminal, the funds escrow terminal, and the payee's terminal communicate via near-field communication. Locking the funds escrow terminal involves using encryption methods such as a password or fingerprint to lock the terminal. While locked, the terminal cannot be operated, effectively locking the funds in the terminal's electronic wallet and preventing the transfer of funds within the electronic wallet.

[0108] In the fund custody transaction method of the embodiment of the present invention, the fund custody terminal performs fund custody and locking based on the transfer request of the payer terminal, then unlocks the funds in the fund custody account according to the unlocking request of the payer terminal, and transfers the unlocked funds in the fund custody account to the payee account based on the collection request of the payee terminal. The custody of funds is realized through the fund custody terminal without the need for the participation of a third-party financial institution. The process is simple and convenient, which can effectively ensure the normal progress of the transaction and avoid disputes.

[0109] See also Figure 3 As shown, an embodiment of the present invention provides a fund custody transaction system, which includes a payer terminal, a payee terminal and a fund custody terminal.

[0110] The payer terminal is used to send transfer requests and unlocking requests to the fund custody terminal; the payee terminal is used to send collection requests to the fund custody terminal; the fund custody terminal is used to receive transfer requests sent by the payer terminal, transfer the agreed funds from the payer account to the fund custody account and lock them, receive unlocking requests sent by the payer terminal, unlock the agreed funds in the fund custody account, and receive collection requests sent by the payee terminal, and transfer the unlocked collection funds in the fund custody account to the payee account.

[0111] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

[0112] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

Claims

1. A fund custody transaction method, characterized in that: The specific steps include: Based on the transfer request from the payer terminal, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer account to the fund escrow account and locks the funds; Based on the agreed service execution status and after the execution is completed, the fund escrow terminal unlocks the agreed funds in the fund escrow account according to the unlocking request of the payer terminal; Based on the payment request from the payee terminal, the fund escrow terminal transfers the unlocked payment funds in the fund escrow account to the payee account; The payer's terminal is kept by the payer; The payee terminal is kept by the payee; the fund custody terminal is initially kept by the payer. When the transfer agreed funds are transferred from the payer's account to the fund custody account and locked, the fund custody terminal is kept by the payee.

2. A fund custody transaction method according to claim 1, characterized in that: The fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the fund escrow account and locks the funds based on the transfer request from the payer's terminal. The specific steps include: Based on the near-field communication method, the fund custody terminal establishes a connection with the payer terminal; Based on digital signature technology, the fund custody terminal completes identity authentication with the payer terminal; The fund escrow terminal receives a transfer request initiated by the payer terminal, wherein the transfer request includes the agreed fund information; Based on the transfer request, the fund custody terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding fund custody account and lock it.

3. A fund custody transaction method according to claim 2, characterized in that: Based on the transfer request, the fund escrow terminal authorizes and agrees to transfer the agreed funds from the payer's account to the corresponding fund escrow account and lock it. The specific steps include: Based on the transfer request, the fund escrow terminal transfers the agreed funds from the payer's account to the fund escrow account corresponding to the fund escrow terminal; The fund custody terminal prompts whether to lock the funds, and waits for the payer to confirm the fund lock by pressing the physical button on the fund custody terminal to lock the funds transferred to the fund custody account.

4. A fund custody transaction method according to claim 1, characterized in that: Before the funds escrow terminal unlocks the agreed funds in the funds escrow account according to the unlocking request of the payer terminal, the method further includes: The fund escrow terminal receives a connection request initiated by the payer terminal; The fund escrow terminal displays the connection request sent by the payer terminal; The funds custody terminal responds to the payee's connection confirmation via the physical button on the funds custody terminal; Based on the near-field communication method, the fund custody terminal establishes a connection with the payer terminal; The funds escrow terminal receives the unlocking request sent by the payer terminal.

5. A fund custody transaction method according to claim 4, characterized in that: The fund escrow terminal unlocks the agreed funds in the fund escrow account according to the unlocking request of the payer terminal, and the specific steps include: The fund escrow terminal receives the unlocking request sent by the payer terminal; Based on digital signature technology, identity authentication is performed between the fund escrow terminal and the payer terminal. After the authentication is passed, the fund escrow terminal will prompt whether to unlock the funds; The payee confirms whether to unlock the funds and unlocks the agreed funds in the fund escrow account.

6. A fund custody transaction method according to claim 5, characterized in that: Before the fund escrow terminal transfers the unlocked funds in the fund escrow account to the payee's account based on the payee's payment request, the following steps are also required: The fund custody terminal receives the connection request sent by the payee terminal; The fund escrow terminal displays the connection request sent by the payee terminal; The funds custody terminal responds to the payee's connection confirmation via the physical button on the funds custody terminal; Based on the near-field communication method, the fund custody terminal establishes a connection with the payee terminal; The fund escrow terminal receives the payment request sent by the payee terminal.

7. A fund custody transaction method according to claim 6, characterized in that: The fund escrow terminal transfers the unlocked funds in the fund escrow account to the payee's account based on the payee's payment request. The specific steps include: The fund escrow terminal receives the payment request sent by the payee terminal and displays the transfer amount and the payee's account information; The funds custody terminal responds to the payee's confirmation of the transfer via the physical button of the funds custody terminal; The unlocked funds in the fund escrow account are transferred to the payee's account.

8. A fund custody transaction method according to claim 1, characterized in that: When the received funds are equal to the agreed funds, the unlocked received funds in the funds escrow account are transferred to the payee's account, specifically: all the agreed funds unlocked in the funds escrow account are transferred to the payee's account; When the received funds are not equal to the agreed funds, the unlocked received funds in the funds escrow account are transferred to the payee's account, specifically: for the unlocked agreed funds in the funds escrow account, the funds equal to the amount of received funds are transferred to the transfer-to payee's account, and the remaining amount of funds are transferred to the transfer-to payee's account; Among them, when the collected funds are not equal to the agreed funds, the agreed funds are greater than the collected funds.

9. A fund custody transaction method according to claim 1, characterized in that: When there is no fund escrow account: The payer terminal transfers the agreed funds to the offline electronic wallet set up in the fund custody terminal, and locks the agreed funds by locking the fund custody terminal; Based on the agreed service execution status and after the execution is completed, the unlocking fund custody terminal will unlock the agreed funds, and then transfer the received funds to the payee terminal.

10. A fund custody trading system, characterized in that: Including payer terminal, payee terminal and fund custody terminal; The payer terminal is used to send a transfer request and an unlock request to the fund custody terminal; The payee terminal is used to send a payment request to the fund custody terminal; The funds escrow terminal is used to receive a transfer request sent by a payer terminal, transfer the agreed funds from the payer's account to the funds escrow account and lock it, receive an unlock request sent by the payer terminal, unlock the agreed funds in the funds escrow account, and receive a payment request sent by a payee terminal, transfer the unlocked payment funds in the funds escrow account to the payee's account; The payer's terminal is kept by the payer; The payee terminal is kept by the payee; the fund custody terminal is initially kept by the payer. When the transfer agreed funds are transferred from the payer's account to the fund custody account and locked, the fund custody terminal is kept by the payee.

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