KR102600645B1 - Cancelable transfer method for cryptocurrency - Google Patents

Abstract

The cancelable cryptocurrency remittance method is based on a blockchain smart contract, where the sender's e-wallet app connects to the blockchain node to create and distribute a smart contract that sets the entered remittance amount, the recipient's e-wallet address, and the remittance freeze time. After transferring the remittance amount from the sender's electronic wallet to the smart contract address, the transfer is frozen by starting the set transfer freeze time timer, and when the transfer freeze time timer expires, the transfer is sent to the recipient's electronic wallet address. However, after the remittance is initiated and before the remittance freeze timer expires, the remittance transaction is canceled at the request of the remitter and a means is provided to refund the remittance amount to the remitter.

Description

CANCELABLE TRANSFER METHOD FOR CRYPTOCURRENCY}

This invention relates to a method of transferring cryptocurrency. More specifically, an invention is disclosed regarding a method of transferring cryptocurrency that allows the transfer to be canceled after the transfer has been made.

In general, cryptocurrency refers to currency that is traded online based on encryption technology without the physical form, such as banknotes or coins. Unlike regular currencies issued by governments or central banks, cryptocurrency is valued according to rules set by the person who first designed it. These cryptocurrencies have the characteristic of being distributed based on blockchain technology without the government or central bank managing transaction details. Cryptocurrency is based on encryption technology and is known to be safe from hacking because all nodes participating in the blockchain have the same transaction ledger. Representative cryptocurrencies include Bitcoin, a cryptocurrency developed by Satoshi Nakamoto and whose source code was released in January 2009, and other cryptocurrencies include Ethereum and Ripple.

Cryptocurrencies based on blockchain allow remittance transactions that transfer ownership of the currency, just like regular currencies. Blockchain technology, which has emerged rapidly along with cryptocurrency, is developing to enable a variety of transactions beyond simple remittance transactions. Although limited, Bitcoin also allows you to use Bitcoin scripts to create smart contracts that automatically perform transactions according to conditions. However, Bitcoin script has limitations as it cannot use loops and cannot manage information other than Bitcoin balance.

Since then, various blockchain platforms, including Ethereum, have been supporting smart contracts that overcome the limitations of Bitcoin script. Smart contracts are a reliable code execution technology even in a distributed network environment. This ensures that contracts with various conditions are executed without central systems or human intervention and that the contracts proceed according to the conditions.

A variety of decentralized applications are being developed that can manage information other than cryptocurrency balances using smart contracts.

The proposed invention freezes the transferred cryptocurrency for a certain period of time to prevent losses due to incorrectly remitted remittance transactions due to phishing, etc., and provides a method to cancel the remittance transaction and refund the money to the sender in case of an incorrect remittance. The purpose is to

According to one aspect, the revocable cryptocurrency remittance method is based on a blockchain smart contract, where the sender's electronic wallet app connects to the blockchain node and creates a smart contract that sets the entered remittance amount, the recipient's electronic wallet address, and the transfer freeze time. After creating and distributing the remittance amount from the sender's electronic wallet to the smart contract address, use the method of starting the set remittance freeze time timer to freeze the remittance, and sending the money to the recipient's e-wallet address when the remittance freeze time timer expires. do. However, after the remittance is initiated and before the remittance freeze timer expires, the remittance transaction is canceled at the request of the remitter and a means is provided to refund the remittance amount to the remitter.

According to an additional aspect, the recipient's electronic wallet app can request an immediate remittance, and in response, the sender's electronic wallet app can connect to a smart contract and process the money to be transferred immediately even before the freeze time timer expires.

The proposed invention freezes the transferred cryptocurrency for a certain period of time, cancels the transfer transaction in case of an incorrect transfer, and refunds the money back to the sender. This has the effect of minimizing losses due to incorrectly transferred remittance transactions due to phishing, etc. .

Figure 1 is a conceptual diagram of a user accessing a smart contract distributed on a blockchain and executing a smart contract.
Figure 2 illustrates the procedure of a revocable cryptocurrency remittance method using a smart contract according to an embodiment.
Figure 3 is a flowchart illustrating a remittance execution process after the remittance freeze time has elapsed in a remittance method for revocable cryptocurrency according to an embodiment.
Figure 4 is a flowchart illustrating the process of checking the remittance freeze time in the remittance method of revocable cryptocurrency according to another embodiment.
Figure 5 illustrates the procedure of a revocable cryptocurrency remittance method using a smart contract according to another embodiment.
Figure 6 is a flowchart showing the process of executing an immediate remittance before the remittance freeze time has elapsed in a remittance method for revocable cryptocurrency according to another embodiment.
Figure 7 illustrates a remittance cancellation procedure for a revocable cryptocurrency remittance method using a smart contract according to another embodiment.
Figure 8 is a flow chart illustrating a contract cancellation process before the remittance freeze time has elapsed in a remittance method for cancelable cryptocurrency according to another embodiment.
Figure 9 is a block diagram of a smart contract implementing a cancelable remittance method according to an example of an aspect.

The foregoing and additional aspects are embodied through embodiments described with reference to the accompanying drawings. It is understood that various combinations of the components of each embodiment are possible within the embodiment as long as there is no other mention or contradiction between them. In some cases, each block in a block diagram may represent a physical part, but in other cases, it may be a logical expression of a part of the function of one physical part or a function across multiple physical parts. Sometimes the entity of a block or part of it may be a set of program instructions. These blocks can be implemented in whole or in part by hardware, software, or a combination of these.

A smart contract is an application that runs on a blockchain. This is a technology that uses the distributed ledger technology of blockchain to impose contract conditions between interested parties without an intermediary and automatically conclude a contract when the contract conditions are met. Smart contracts are written in a programming language such as Solidity, compiled, and distributed to the blockchain in the form of bytecode. In other words, it is stored in the form of bytecode within the block of the blockchain. Therefore, because all nodes participating in the blockchain network have the same block, all nodes can hold and execute the bytecode of the deployed smart contract. Representative blockchain platforms that support smart contracts include Etherium and EOS.

Figure 1 is a conceptual diagram of a user accessing a smart contract distributed on a blockchain and executing a smart contract. As shown in Figure 1, User 1 and User 2 access the bytecode of a smart contract existing in the blockchain through an electronic wallet-type application. The smart contract's bytecode is executed in the virtual machine of the blockchain of the node connected by the user, and when data is updated through remittance, etc., the update is transmitted to the blockchain network. Additionally, User 1 and User 2 can also access the electronic wallet implemented in the form of a web application of the blockchain node accessed through the web browser of their computing device.

Hereinafter, both a stand-alone electronic wallet-type application or a web application electronic wallet running in a browser are referred to as electronic wallet apps.

As shown in Figure 1, the created smart contract is distributed and included in the blockchain. As an example, the blockchain platform may be the Ethereum platform. In this case, users can access the smart contract by connecting to the Ethereum client on the node of the Ethereum blockchain through a browser, etc. Ethereum's smart contracts are deployed on the blockchain network as EVM bytecode that runs on the Ethereum Virtual Machine (EVM), allowing users to execute the corresponding EVM bytecode on an Ethereum client.

Figure 2 illustrates the procedure of a revocable cryptocurrency remittance method using a smart contract according to an embodiment. According to one embodiment of the invention, the revocable cryptocurrency remittance method is distributed on the blockchain and the remittance is executed based on a smart contract (100) running on the virtual machine of the blockchain node, and the smart contract (100) is created It includes a distributing step, a step of processing the transfer to the smart contract 100 address, a step of freezing the remittance amount for a remittance freeze time and waiting for the remittance, and a step of processing the remittance to the recipient's electronic wallet address and terminating the transaction.

The smart contract 100, which implements a revocable cryptocurrency transfer method, is written and compiled as a set of executable instructions on a blockchain virtual machine and distributed in the form of bytecode. A remitter who wants to send money using a revocable cryptocurrency remittance method can access a blockchain node through an electronic wallet app on a computing device such as a PC or smart phone and execute a smart contract (100) on the node's blockchain virtual machine.

The step of creating and distributing the smart contract (100) involves allowing the remitter to access the blockchain node through an electronic wallet app running on the remitter's computing device so that the smart contract (100) can be executed in the blockchain virtual machine on the blockchain node. This is the step of creating and distributing a smart contract object (instance) (S1000). In other words, this is the step where the sender's electronic wallet app 200 connects to the blockchain node, calls the creator of the smart contract 100, creates an object (instance), and distributes the created object to the blockchain. At this time, the parameters passed to the generator include the remittance amount, the recipient's electronic wallet address, and remittance freeze time information. Therefore, the sender's electronic wallet app 200 connects to the blockchain node, creates a smart contract 100 that sets the remittance amount, the recipient's electronic wallet address, and transfer freeze time information, and distributes it to the blockchain network.

When a smart contract object is created and distributed, after a certain period of time, a block containing the smart contract (100) is mined and included in the blockchain. Afterwards, the smart contract 100 can be accessed to execute the contract. Accessing the smart contract 100 and executing the contract means accessing the object using the address of the deployed smart contract 100 and calling the method of the object. For example, in the case of the Ethereum platform, if it is necessary to change the internal state of the smart contract 100, the object method can be executed by calling the sendTransaction function, and there is no need to change the internal state of the smart contract 100. In this case, you can execute an object's method by calling the call function.

Depending on the aspect of the invention, an interface for creating and distributing a smart contract 100 may be provided in an electronic wallet app running on the remitter's computing device. When creating a smart contract object, the user enters the required remittance amount, the recipient's electronic wallet address, and the transfer freeze time and presses the button for contract creation in the provided interface. The electronic wallet app connects to a specific blockchain node and creates a smart contract (100). The internal processing of creation and distribution can be performed automatically.

The step of processing the remittance to the smart contract (100) address is the step of processing the remittance amount set to the smart contract (100) address where the sender's electronic wallet app (200) is created. In order to transfer the remittance amount from the sender to the recipient. First, it is a process of withdrawing cryptocurrency equivalent to the remittance amount from the sender's account (S1100). As with the conventional remittance method, which involves immediate remittance, the remittance amount is deducted from the sender's account in the cancelable cryptocurrency remittance method. However, rather than being transferred immediately to the recipient's account, the money is sent to the address of the smart contract (100), and when the conditions for the transfer are met, the money is transferred to the recipient's electronic wallet to complete the smart contract (100), and the conditions for the transfer are met. If not, the cryptocurrency is refunded to the sender's electronic wallet and the smart contract (100) can be terminated.

According to one aspect of the invention, the process of transferring the remittance amount from the sender's electronic wallet app 200 running on the sender's computing device to the smart contract 100 address may be automatically performed. According to another aspect of the invention, an electronic wallet app running on the remitter's computing device may provide an interface for remitting the remittance amount to the smart contract 100 address, and the remitter may use the method to remit the remittance using the interface.

In the step of freezing the remittance amount for the remittance freeze time and waiting for the remittance, the remitter's electronic wallet app (200) connects to the smart contract (100) to freeze the remittance of the smart contract (100) to prevent phishing, etc. This is the step of starting a timer, freezing the remittance amount to be remitted to the recipient for a designated remittance freeze time, that is, until the timer expires, and waiting for the remittance (S1200).

Cryptocurrency is generally known to be impossible to hack due to its excellent security, but as soon as the transfer is initiated, the remittance amount is deducted from the sender's account and the recipient's account is increased by the amount deducted, so there is a way to reverse the transfer if it is incorrectly transferred. There is no In other words, once a transaction related to a remittance is recorded in a block, agreed upon, and added to the blockchain, it can no longer be modified. This is because blockchain technology does not provide a way to restore transaction records stored in the blockchain. Once the transaction details are written on the blockchain, they cannot be modified even through hacking, making them a safe and reliable transaction ledger. However, even if a remittance is made incorrectly due to phishing or mistake, once the transaction details are written on the blockchain, they cannot be reversed. You will not be able to recover your cryptocurrency. Therefore, even if the remittance amount is withdrawn from the sender's e-wallet for remittance, the remittance amount is frozen so that it is not transferred to the recipient's e-wallet for a certain period of time, that is, the remittance freeze time, and in case of an incorrect remittance, the cryptocurrency can be refunded to the original account. If you do so, you can provide a way to get incorrect remittances back even if the remittance transaction details are recorded on the blockchain.

Depending on the aspect of the invention, the remittance freezing time may be set uniformly in the system (for example, 24 hours), or the remitter may designate the desired remittance freezing time.

When the sender connects to the smart contract 100 through an electronic wallet app running on the sender's computing device and starts the transfer freeze time timer through the interface provided by the electronic wallet, the smart contract object sets the designated transfer freeze time timer. The transfer will wait until expiration without processing the transfer to the recipient's electronic wallet.

In the step of processing and ending the transfer to the recipient's electronic wallet address, the smart contract (100) automatically processes the transfer of the frozen remittance amount from the smart contract (100) address to the recipient's electronic wallet address when the transfer freeze timer expires, and the smart contract (100) ends (S1300). At this time, since the sender has already sent the money (the money is sent to the smart contract address), no additional work is required to send the money, and the recipient only needs to receive the money, so no additional work is required. Therefore, when the remittance freeze time timer expires, the remittance amount can be automatically transferred from the address of the smart contract 100 sent from the sender's electronic wallet to the recipient's electronic wallet address.

Figure 3 is a flowchart illustrating a remittance execution process after the remittance freeze time has elapsed in a remittance method for revocable cryptocurrency according to an embodiment. As shown in Figure 3, the sender's electronic wallet app 200, which receives the remittance amount, the recipient's electronic wallet address, and the transfer freeze time from the sender, connects to the blockchain node, delivers the entered items, and executes a smart contract (100). )'s constructor is called to create an object and distribute it to the blockchain network (S1000). After a certain period of time, when a block containing the bytecode of the smart contract 100 is added, the sender requests the smart contract 100 to process the remittance amount to the address of the smart contract 100 through the sender's electronic wallet app 200. (S1100). The smart contract 100 deducts the remittance amount from the sender's account and adds it to the smart contract 100 account.

The sender requests the smart contract 100 to start a remittance freeze time timer through the remitter's electronic wallet app 200 and causes the remittance to be frozen until the timer expires (S1200). Depending on the aspect of the invention, the process of sending money to the smart contract 100 address and requesting the start of the transfer freeze time timer can be processed with a single user action. In other words, when the user selects a specific button (e.g., start remittance), requesting remittance processing to the smart contract 100 address and requesting the start of the remittance freeze time timer can be implemented in that order. According to another aspect of the invention, the above two requests are made through a separate user interface, that is, selecting a button to request a transfer to the smart contract 100 address, and a button to request the start of a transfer to additionally request the start of the freeze time timer. It may also be implemented to select.

The smart contract 100 starts a timer in response to a timer start request (S1210) and freezes the remittance amount. Afterwards, when the remittance freeze time timer expires (S1220), the remittance amount is automatically transferred from the smart contract (100) address to the recipient's electronic wallet address (S1300).

Figure 4 is a flowchart illustrating the process of checking the remittance freeze time in the remittance method of revocable cryptocurrency according to another embodiment. According to another embodiment of the invention, a revocable cryptocurrency remittance method based on a smart contract 100 includes the steps of creating and distributing a smart contract 100, processing the remittance to the smart contract 100 address, and , freezing the remittance amount for the remittance freeze time and waiting for the remittance, processing and terminating the remittance to the recipient's electronic wallet address, and may further include the step of inquiring the remittance amount and the remittance freeze time.

The step of creating and distributing the smart contract (100) involves allowing the remitter to access the blockchain node through an electronic wallet app running on the remitter's computing device so that the smart contract (100) can be executed in the blockchain virtual machine on the blockchain node. This is the step of creating and distributing a smart contract object (instance) by passing parameters including the remittance amount, recipient's electronic wallet address, and remittance freeze time (S2000).

The step of processing the remittance to the smart contract (100) address is the step of processing the remittance amount set to the smart contract (100) address where the sender's electronic wallet app (200) is created. In order to transfer the remittance amount from the sender to the recipient. The first step is to withdraw cryptocurrency equivalent to the remittance amount from the sender's account (S2100).

In the step of freezing the remittance amount for the remittance freeze time and waiting for the remittance, the remitter's electronic wallet app (200) connects to the smart contract (100) and sets the remittance freeze time timer of the smart contract (100) to prevent phishing, etc. This is the step of starting (S2210) and freezing the remittance amount to be sent to the recipient for a designated remittance freeze time, that is, until the timer expires, and waiting for the remittance (S2200).

The step of checking the remittance amount and the remaining remittance freezing time is a step in which the recipient's electronic wallet app 300 connects to the smart contract 100 to inquire and output the frozen remittance amount and the remaining remittance freezing time (S2300). The recipient can access the smart contract 100 and check the remittance amount set in the smart contract 100 to check whether the remittance amount matches the contracted amount, and check the remaining remittance freeze time to determine when the remittance will be sent to his or her account. You can understand it accurately.

In the step of processing and ending the transfer to the recipient's electronic wallet address, the smart contract 100 automatically processes the transfer of the frozen remittance amount from the smart contract 100 address to the recipient's electronic wallet address when the transfer freeze timer expires and the smart contract 100 automatically processes the transfer of the frozen remittance amount to the recipient's electronic wallet address. (100) ends (S2400).

Figure 5 illustrates the procedure of a revocable cryptocurrency remittance method using a smart contract according to another embodiment. According to another embodiment of the invention, a revocable cryptocurrency remittance method based on a smart contract 100 includes the steps of creating and distributing a smart contract 100, processing the remittance to the smart contract 100 address, and , including the steps of freezing the remittance amount for a remittance freeze time and waiting for the remittance, processing and terminating the remittance to the recipient's electronic wallet address, requesting an immediate remittance, and further steps of immediately processing and terminating the remittance. It can be included.

The step of creating and distributing the smart contract (100) involves allowing the remitter to access the blockchain node through an electronic wallet app running on the remitter's computing device so that the smart contract (100) can be executed in the blockchain virtual machine on the blockchain node. This is the step of creating and distributing a smart contract object (instance) by passing parameters including the remittance amount, recipient's electronic wallet address, and remittance freeze time (S3000).

The step of processing the remittance to the smart contract (100) address is the step of processing the remittance amount set to the smart contract (100) address where the sender's electronic wallet app (200) is created. In order to transfer the remittance amount from the sender to the recipient. The first step is to withdraw cryptocurrency equivalent to the remittance amount from the sender's account (S3100).

In the step of freezing the remittance amount for the remittance freeze time and waiting for the remittance, the remitter's electronic wallet app (200) connects to the smart contract (100) and sets the remittance freeze time timer of the smart contract (100) to prevent phishing, etc. This is the step of starting and waiting for the remittance to be sent to the recipient by freezing the remittance amount for a designated remittance freeze time, that is, until the timer expires (S3200).

The step of requesting immediate remittance is a step in which the recipient's electronic wallet app (300) connects to the smart contract (100) before the remittance freeze time timer expires and requests immediate transfer to the sender's electronic wallet app (200) (S3300) . In addition to automatically sending money to the recipient's account when the remittance freeze time timer expires, it can also be used as a means to request an immediate remittance from the sender even before the remittance freeze time expires if the recipient has already met the sender's requirements. This has the effect of enabling expansion into other contracts other than simple remittance contracts. For example, if the sender purchases a product that the recipient sells from a remote location via communication (telephone, Internet, etc.) and sends the money using a remittance method that can be canceled until the product is received, and the recipient receives the product, the recipient immediately sends the money. Allow you to request it.

The step of immediately processing and terminating the remittance is another process of terminating the smart contract 100. In response to the recipient's immediate remittance request, the sender's electronic wallet app 200 connects to the smart contract 100 before the remittance freeze timer expires. This is the step of processing the transfer of the frozen remittance amount from the smart contract 100 address to the recipient's electronic wallet address and terminating the smart contract 100 (S3400, S3500). Depending on the aspect of the invention, even if there is no immediate request for remittance from the recipient, the sender may voluntarily request remittance immediately when the desired contract conditions are achieved.

Figure 6 is a flowchart showing the process of executing an immediate remittance before the remittance freeze time has elapsed in a remittance method for revocable cryptocurrency according to another embodiment. As shown in Figure 6, the sender's electronic wallet app 200, which receives the remittance amount, the recipient's electronic wallet address, and the transfer freeze time from the sender, connects to the blockchain node, delivers the entered items, and executes a smart contract (100). )'s constructor is called to create an object and distribute it to the blockchain network (S3000). After a certain period of time, when a block containing the bytecode of the smart contract 100 is added, the sender requests the smart contract 100 to process the remittance amount to the address of the smart contract 100 through the sender's electronic wallet app 200. (S3100). The smart contract 100 deducts the remittance amount from the sender's account and adds it to the smart contract 100 account.

The remitter requests the smart contract 100 to start a remittance freeze time timer through the remitter's electronic wallet app 200 and causes the remittance to be frozen until the timer expires (S3200). Depending on the aspect of the invention, the process of sending money to the smart contract 100 address and requesting the start of the transfer freeze time timer can be processed with a single user action. In other words, when the user selects a specific button (e.g., start remittance), requesting remittance processing to the smart contract 100 address and requesting the start of the remittance freeze time timer can be implemented in that order. According to another aspect of the invention, the above two requests are made through a separate user interface, that is, selecting a button to request a transfer to the smart contract 100 address, and a button to request the start of a transfer to additionally request the start of the freeze time timer. It may also be implemented to select.

The smart contract 100 starts a timer according to the timer start request (S3210) and freezes the remittance amount.

If the recipient's electronic wallet app (300) satisfies all the conditions required by the sender even before the remittance freeze time timer expires, it can connect to the smart contract (100) and request an immediate remittance (S3300). The smart contract 100, which immediately receives the request, notifies the sender's electronic wallet app 200 that there is an immediate remittance request (S3310). Depending on the aspect of the invention, at this time, the sender's electronic wallet app 200 may display a message notifying the recipient's immediate remittance request.

After confirming that the recipient has satisfied all of the requirements, the sender immediately responds to the remittance request, connects to the smart contract (100) before the remittance freeze time timer expires, and corresponds from the smart contract (100) address to the recipient's electronic wallet address. You can request remittance processing of the remittance amount (S3400). The smart contract 100 that receives this request processes the remittance amount to the recipient's electronic wallet address and terminates the smart contract 100 (S3500).

Figure 7 illustrates a remittance cancellation procedure for a revocable cryptocurrency remittance method using a smart contract according to another embodiment. According to another embodiment of the invention, a revocable cryptocurrency remittance method based on a smart contract 100 includes the steps of creating and distributing a smart contract 100, processing the remittance to the smart contract 100 address, and , it may further include a step of freezing the remittance amount for a remittance freeze time and waiting for the remittance, processing and terminating the remittance to the recipient's electronic wallet address, and a step of canceling the contract and processing a refund.

The step of creating and distributing the smart contract (100) involves allowing the remitter to access the blockchain node through an electronic wallet app running on the remitter's computing device so that the smart contract (100) can be executed in the blockchain virtual machine on the blockchain node. This is the step of creating and distributing a smart contract object (instance) by passing parameters including the remittance amount, recipient's electronic wallet address, and remittance freeze time (S4000).

The step of processing the remittance to the smart contract (100) address is the step of processing the remittance amount set to the smart contract (100) address where the sender's electronic wallet app (200) is created. In order to transfer the remittance amount from the sender to the recipient. The first step is to withdraw cryptocurrency equivalent to the remittance amount from the sender's account (S4100).

In the step of freezing the remittance amount for the remittance freeze time and waiting for the remittance, the remitter's electronic wallet app (200) connects to the smart contract (100) and sets the remittance freeze time timer of the smart contract (100) to prevent phishing, etc. This is the step of starting and waiting for the remittance to be sent to the recipient by freezing the remittance amount for a designated remittance freeze time, that is, until the timer expires (S4200).

In the step of canceling the contract and processing a refund, the sender's electronic wallet app (200) connects to the smart contract (100) before the transfer freeze timer expires and transfers the frozen remittance amount from the smart contract (100) address to the sender's electronic wallet address. This is the step of processing a refund and destroying the smart contract (100) (S4300). If the sender sends money to the wrong recipient due to phishing or by mistake, the transfer freeze timer expires and the transfer is canceled and the smart contract (100) is terminated before the transfer is automatically transferred to the recipient's account. Alternatively, it can be used as a means to cancel and terminate the transfer before the freeze time timer expires when the recipient is unable to achieve the contractual conditions required by the sender.

Figure 8 is a flow chart illustrating a contract cancellation process before the remittance freeze time has elapsed in a remittance method for cancelable cryptocurrency according to another embodiment. As shown in Figure 8, the sender's electronic wallet app 200, which receives the remittance amount, the recipient's electronic wallet address, and the transfer freeze time from the sender, connects to the blockchain node, delivers the entered items, and executes a smart contract (100). )'s constructor is called to create an object and distribute it to the blockchain network (S4000). After a certain period of time, when a block containing the bytecode of the smart contract 100 is added, the sender requests the smart contract 100 to process the remittance amount to the address of the smart contract 100 through the sender's electronic wallet app 200. (S4100). The smart contract 100 deducts the remittance amount from the sender's account and adds it to the smart contract 100 account.

The sender requests the smart contract 100 to start a remittance freeze time timer through the remitter's electronic wallet app 200 and causes the remittance to be frozen until the timer expires (S4200). Depending on the aspect of the invention, the process of sending money to the smart contract 100 address and requesting the start of the transfer freeze time timer can be processed with a single user action. In other words, when the user selects a specific button (e.g., start remittance), requesting remittance processing to the smart contract 100 address and requesting the start of the remittance freeze time timer can be implemented in that order. According to another aspect of the invention, the above two requests are made through a separate user interface, that is, selecting a button to request a transfer to the smart contract 100 address, and a button to request the start of a transfer to additionally request the start of the freeze time timer. It may also be implemented to select.

The smart contract 100 starts a timer in response to a timer start request (S4210) and freezes the remittance amount.

If the sender's electronic wallet app (200) realizes that the transfer was made incorrectly before the transfer freeze timer expired, or if the recipient does not meet the conditions required by the sender, it can request cancellation of the transfer by connecting to the smart contract (100) (S4250) . The smart contract 100, which has received the remittance cancellation, processes a refund from the address of the smart contract 100 to the sender's electronic wallet address and terminates execution of the smart contract 100 (S4300).

Figure 9 is a block diagram of a smart contract implementing a cancelable remittance method according to an example of an aspect. The smart contract 100, which implements a cancelable remittance method according to one aspect example, includes a remittance amount inquiry processing unit 110 that performs the function of processing the remittance amount inquiry set according to the remittance amount inquiry request from the recipient's electronic wallet app 300; , a remittance freeze time inquiry processing unit 120 that performs the function of processing the remittance freeze time remaining until the expiration of the timer in response to a remittance freeze time inquiry request from the recipient's electronic wallet app 300, and the recipient's electronic wallet app 300. )'s immediate remittance request, an immediate remittance request processing unit 130 that performs the function of transmitting an immediate remittance request to the sender's electronic wallet app 200, and A remittance processing unit 140 that immediately performs the function of processing the remittance, a remittance processing unit 150 that performs the function of processing the remittance amount set to the electronic wallet address of the designated recipient when the remittance freeze time timer expires, and a remittance freeze timer. It may include a remittance cancellation processing unit 160 that processes the function of returning the remittance amount to the sender's electronic wallet address before the timer expires and canceling and terminating the contract.

The smart contract 100 can be written in a programming language such as Solidity, and is a computer program that runs on a virtual machine of the blockchain platform and can be stored in a storage medium such as CD??ROM, USB, ROM, or RAN.

In the above, the present invention has been described through embodiments with reference to the attached drawings, but it is not limited thereto, and should be interpreted to encompass various modifications that can be easily derived by those skilled in the art. The claims are intended to cover these variations.

100: Smart contract
110: Remittance inquiry processing department
120: Remittance freeze time inquiry processing department
130: Immediate remittance request processing unit
140: Immediate remittance processing department
150: Remittance processing department
160: Remittance cancellation processing department
200: Sender’s electronic wallet app
300: Recipient’s electronic wallet app

Claims (5)

In a smart contract-based cryptocurrency remittance method running on the virtual machine of a blockchain node,
The sender's electronic wallet app connects to the blockchain node to create a smart contract with the remittance amount, the recipient's electronic wallet address, and the transfer freeze time information specified by the sender and distributes it to the blockchain;
Processing the transfer of the remittance amount set to the smart contract address created by the sender's electronic wallet app;
The sender's electronic wallet app connects to the smart contract, starts the smart contract's remittance freeze time timer, and waits for the remittance for the specified remittance freeze time; and
The smart contract processes and terminates the transfer of the frozen remittance amount from the smart contract address to the recipient's electronic wallet address when the remittance freeze timer expires;
Including,
A cryptocurrency remittance method further comprising the step of connecting the recipient's electronic wallet app to a smart contract before the remittance freeze time timer expires to query and print the frozen remittance amount and remaining remittance freeze time.
delete The method of claim 1, wherein the method
A step where the recipient's electronic wallet app connects to the smart contract before the transfer freeze timer expires and requests the sender's electronic wallet app to immediately execute the transfer; and
The sender's electronic wallet app connects to the smart contract before the remittance freeze time timer expires, processes the transfer of the frozen remittance amount from the smart contract address to the recipient's electronic wallet address, and terminates the smart contract;
A cryptocurrency remittance method that further includes.
The method of claim 1, wherein the method
The sender's electronic wallet app connects to the smart contract before the transfer freeze timer expires, refunds the frozen remittance amount from the smart contract address to the sender's electronic wallet address, and destroys the smart contract;
A cryptocurrency remittance method that further includes.
In a computer program implementing a smart contract running on a virtual machine of a blockchain node,
A remittance inquiry processing unit that performs the function of processing the inquiry of the remittance amount set according to the remittance amount inquiry request from the recipient's electronic wallet app;
A remittance freeze time inquiry processing unit that performs the function of processing the remittance freeze time remaining until the expiration of the timer in response to a remittance freeze time inquiry request from the recipient's electronic wallet app;
An instant remittance request processing unit that performs the function of transmitting an instant remittance request to the sender's e-wallet app according to an instant remittance request from the recipient's e-wallet app;
An immediate remittance processing unit that performs the function of processing the remittance amount before the expiration of the remittance freeze time timer according to the remittance sender's request for immediate remittance;
A remittance processing unit that performs the function of processing the remittance amount set to the electronic wallet address of the designated recipient when the remittance freeze time timer expires; and
A remittance cancellation processing unit that returns the remittance amount to the sender's electronic wallet address before the remittance freeze timer expires and performs the function of canceling and terminating the contract;
A computer program that implements a smart contract stored on a medium that runs in conjunction with a virtual machine on a blockchain platform, including.

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