TW202125368A - Shares transfer system based on security token and method thereof - Google Patents

Abstract

A shares transfer system based on security token and method thereof is disclosed. By providing a blockchain network with a transfer smart contract and a tax smart contract, and generating a plurality of security tokens on the blockchain network according to a number of shares. When want to transfer the shares from a sender account to a receiver account, first sends the same number of shares of security token to the transfer smart contract and calculates a tax, and allows the sender host to execute the transfer smart contract for transmitting the security tokens to the receiver account after the tax payment is completed and a tax payment certificate is generated. The mechanism is help to improve the convenience and legality when transferring shares.

Description

Share transfer system and method based on security token

The invention relates to a share transfer system and method, in particular to a share transfer system and method based on securities tokens.

In recent years, with the popularity and vigorous development of digital currencies, various digital currencies have sprung up. Among them, security tokens have attracted the most attention.

Generally speaking, the operation of security tokens is similar to that of traditional digital currencies. The holder’s operations, such as sending and receiving, will not be restricted, which means that the transaction is very easy, so it is very suitable for future use. Trading certificates of listed or listed stocks. However, due to the regulations of various countries, such as: avoiding the arbitrary transfer of shares, inheritance, tax evasion, improper trading, etc., the practice does not allow the securities tokens to be transferred at will, so how to reasonably restrict the securities tokens The transaction, which allows them to take into account the convenience and legality of share transfer has become one of the problems that manufacturers urgently want to solve.

In view of this, some manufacturers have proposed to predefine a supervisor role in the smart contract, and the supervisor's consent is required whenever the holder wants to send security tokens. In this way, transactions can be effectively monitored and easily comply with regulatory requirements. However, since this method needs to define the role of the supervisor in the smart contract in advance, it is not only inflexible, but also requires huge update costs when the supervisor changes. In fact, the reason why securities tokens are not allowed to be transferred at will is due to the tax and equity control issues. If the tax issues arising from the transfer of shares can be resolved, for example, tax issues must be resolved in each transaction. , The sending and receiving of security tokens can be supervised, and at the same time they can be allowed to be transferred, thus taking into account the convenience and legality of share transfer.

In summary, it can be seen that in the prior art, there has been a problem of how to balance the convenience and legality of share transfer for a long time. Therefore, it is necessary to propose improved technical means to solve this problem.

The invention discloses a stock transfer system and method based on security tokens.

First of all, the present invention discloses a stock transfer system based on security tokens. The system includes a blockchain network, a company-side host, and an initiator host. Among them, the blockchain network is composed of multiple nodes. This blockchain network has smart contracts for transfer and tax payment; the company-side host is one of the nodes, which is used to advance on the blockchain network based on the number of shares. Generate multiple security tokens, and only allow the transfer of security tokens through the transfer of smart contracts.

As for the initiator host connecting to the node or serving as one of the nodes, the initiator host includes: a sending module, a tax payment module, and a transfer module. Among them, the sending module is used to set the transfer amount when the user wants to transfer shares from the initiator account to the recipient account, and execute the blockchain transaction to hold the same securities as the transfer amount through the initiator account Type tokens are sent to the transfer smart contract, and the tax is calculated based on the transferred amount to display and prompt for tax payment; the tax payment module is connected to the sending module to allow the execution of the tax payment smart contract to be paid on the chain after the tax is calculated Tax function. The tax payment function on this chain includes receiving the digital currency sent by the initiator host to pay the tax, and generating a tax payment certificate after detecting the completion of the tax payment; the transfer module connects to the tax payment module and uses After detecting that the tax payment certificate is generated, execute the transfer request function in the transfer smart contract, and bring the tax payment certificate into the transfer request function, where the transfer request function includes the verification tax payment certificate and the tax payment After the proof is verified, the security tokens sent to the transfer smart contract will be transferred to the recipient's account.

In addition, the present invention discloses a share transfer method based on security tokens, the steps of which include: providing a blockchain network composed of multiple nodes, and the blockchain network has a transfer smart contract and a tax payment smart contract; As one of the nodes, the company-side host generates multiple security tokens on the blockchain network according to the number of shares in advance, and only allows the transfer of security tokens through the transfer of smart contracts; when the user wants to self-initiate When the account transfers shares to the recipient account, the initiator host sets the transfer amount, and the initiator host executes the blockchain transaction to send the security tokens held by the initiator account and the same as the transfer amount to the transfer smart contract. And calculate the tax based on the transfer amount to display and prompt the tax payment; after the tax is calculated, the initiator host is allowed to execute the tax payment function on the chain of the tax payment smart contract. The tax payment function on this chain includes receiving the sender’s host The digital currency is used to pay the tax, and the tax payment certificate is generated after the tax payment is detected; the initiator host detects that the tax payment certificate is generated, executes the transfer request function in the transfer smart contract, and will pay the tax The certificate is brought into the transfer request letter, where the transfer request letter includes verification of the tax payment certificate, and after the tax payment certificate is verified, the security tokens sent to the transfer smart contract are transferred to the recipient's account.

The system and method disclosed in the present invention are as above. The difference from the prior art is that the present invention provides a blockchain network with smart contracts for transfer and tax payment, and the company-side host pre-registers on the blockchain according to the number of shares. Security tokens are generated on the Internet. When you want to transfer shares from the originator’s account to the receiver’s account, first send the same security tokens as the transfer amount to the transfer smart contract and calculate the tax, and when the tax payment is completed and the payment is generated After the tax certificate, the initiator host is allowed to execute the transfer smart contract, and transfer the security tokens sent to the transfer smart contract to the recipient's account.

Through the above-mentioned technical means, the present invention can achieve a technical effect that takes into account the convenience and legality of share transfer.

The following describes the implementation of the present invention in detail with the drawings and embodiments, so as to fully understand and implement the implementation process of how the present invention uses technical means to solve technical problems and achieve technical effects.

Before describing the stock transfer system and method based on security tokens disclosed in the present invention, the self-defined terms of the present invention will be explained. The “transfer smart contract”, “tax payment smart contract”, "Signature verification smart contract" and "Tax Payment List Smart Contract" both refer to the smart contract (Deploy) on the blockchain network (Smart Contract). In fact, the smart contract refers to a computer program that drives the execution of instructions based on established conditions and transmitted information. Specifically, the smart contract uses programming languages such as Solidity, Serpent, LLL, EtherScript, Sidechain, etc. It can include various functions, events, parameter states, etc., take "Ethereum" as an example. The smart contract is compiled to obtain binary code and apply binary interface ( Application Binary Interface, ABI) in order to broadcast the smart contract to the blockchain network, waiting for the miner or validator to put the smart contract on the blockchain and get the corresponding address (or called the contract address) , So far, the release of the smart contract is completed through the blockchain transaction. After that, each node can execute the corresponding smart contract according to this address, and use different commands to change the state of the smart contract on the blockchain and detect whether the event is triggered. In addition, the “Registry” refers to the function that executes the smart contract to store the address of another smart contract in the smart contract, such as storing in an array, that is, registering the smart contract in another smart contract to make Two smart contracts are related. For example, suppose that the first smart contract is published on the blockchain in advance, its address is "0x1a...", and then the second associated smart contract is published on the blockchain, and its address is "0x2b..." , Then when registering, the address of the second smart contract "0x2b..." will be stored in the first smart contract with the address "0x1a...". In this way, although the parties cannot know the address of the second smart contract or when the second smart contract will be released before the second smart contract is released, but with this registration method, when the second smart contract is released After the second smart contract, everyone can instantly know that the second smart contract has been released through the change of the first smart contract, and find the address of the second smart contract from it, and then according to the address of the second smart contract Call/execute the function of the second smart contract.

The following diagrams will further explain the stock transfer system and method based on the security token of the present invention. Please refer to "Figure 1" first. The "Figure 1" is the system of the stock transfer system based on the security token of the present invention. As a block diagram, this system includes: a blockchain network 110, a company-side host 120, and an initiator host 130. Among them, the blockchain network 110 is composed of multiple nodes, and each node is a computer device with network functions, such as a personal computer, a notebook computer, a server, and so on. In addition, the blockchain network 110 includes a Bitcoin (Bitcoin) blockchain network, an Ethereum (Ethereum) blockchain network or other similar blockchain networks, and has been pre-registered on the blockchain network. "Transfer Smart Contract" and "Tax Payment Smart Contract" are published on Road 110. In actual implementation, each node is a peer-to-peer (P2P) connection, and the supervisory host as one of the nodes publishes the "transfer smart contract" on the blockchain network 110 and "Tax payment smart contract"; or a "transfer smart contract" issued by the supervisory host, and a "tax payment smart contract" issued by the tax host as one of the nodes on the blockchain network 110. In addition, the supervisory end host can also publish the signature verification smart contract and the tax payment list smart contract on the blockchain network 110. The signature verification smart contract is used to verify the payment generated by the off-chain tax payment function. The digital signature of the tax certificate. The smart contract of the tax payment list provides the address of the tax payment smart contract to register the tax payment smart contract. When the tax payment smart contract address exists in the tax payment list smart contract, it can be judged that the tax payment certificate has passed the verification For example, each transaction can generate a corresponding tax payment smart contract, and after the tax payment is completed through this tax payment smart contract, the address of this tax payment smart contract (ie: the tax payment smart contract address) is registered to the payment Tax list smart contract. In particular, the transfer smart contract and the tax payment smart contract have corresponding contract addresses, and may have a common standard interface, so as to allow the transfer of the smart contract and the tax payment smart contract to interact with each other through the contract address and the standard interface. Send messages and call functions. For example, if you want to call the "Tax Payment Smart Contract" via the "Transfer Smart Contract", you can give the contract address of the "Tax Payment Smart Contract" so that the "Transfer Smart Contract" can automatically arrive "Tax Payment Smart Contract" checks the tax payment situation, for example: calling the function in "Tax Payment Smart Contract" to detect whether there is a corresponding tax payment certificate on the blockchain. If there is a tax payment certificate, it means that the tax payment has been completed, otherwise it means Tax payment has not yet been completed; conversely, the "tax payment smart contract" can also call the function in the "transfer smart contract" to proactively notify the "transfer smart contract" that the tax payment has been completed, and then perform other subsequent related actions, such as: Generate tax payment certificate.

The company host 120 is used as one of the nodes to generate multiple security tokens on the blockchain network 110 according to the number of shares in advance, and only allow the transfer of security tokens through the "transfer smart contract" . In actual implementation, assuming that the blockchain network 110 is based on the blockchain architecture of Ethereum, then the method of generating security tokens can be established with smart contracts through standards such as ERC20, ERC721, ERC1400 or ERC1410 Tokens running on this blockchain network 110 are used as security tokens. For example, if the number of shares is "10,000", the same or proportional number of security tokens can be generated based on the number of shares. Currency, for example: generate "10,000" or a multiple of security tokens. In addition, the transfer smart contract can automatically check whether the recipient meets the grant conditions, for example, whether it exceeds the annual grant amount, the upper limit of the single company grant, etc., if not, cancel the grant, and verify the tax payment certificate. After the verification is successful, the security token can be automatically forwarded to the recipient.

Then, in the part of the initiator host 130, the initiator host 130 connects to the node or serves as one of the nodes, which includes: a sending module 131, a tax payment module 132, and a transfer module 133. Among them, the sending module 131 is used for when the user wants to transfer shares from the originator account to the recipient account, it is used to set the transfer amount, and execute the blockchain transaction to hold the same amount as the transfer amount through the initiator account The security token is sent to the transfer smart contract, and the tax is calculated based on the transferred amount to display and prompt for tax payment. In other words, when the share transferor (or user) wants to transfer shares to the share receiver, the corresponding amount of security tokens will be sent from the share transferor’s account to the transfer smart contract for subsequent transfers. This transfer smart contract judges whether the tax payment has been completed. If it is, the received security token is sent to the account of the share taker. Otherwise, the security token is not sent, that is, the executed transfer smart contract is judging When the transfer of shares has not yet completed tax payment, this transfer smart contract does not allow the security tokens to be sent directly from the account of the share transferor to the account of the share receiver. In actual implementation, in order to comply with financial regulations, both the account of the share transferor and the account of the share taker need to undergo real-name verification in advance, for example, to achieve real-name verification through Know Your Customer (KYC). In addition, in the calculation of taxes, it can be calculated through smart contracts. For example, the formula for calculating taxes is announced in the smart contract. When the smart contract is executed and the transfer amount is brought in, the transfer amount can be automatically included in the formula calculation Tax out.

The tax payment module 132 is connected to the sending module 131 to use the chain tax payment function that allows the execution of the tax payment smart contract after the tax is calculated. This chain tax payment function contains the digital data sent by the host host. Currency to pay the tax, and a tax payment certificate is generated after the completion of the tax payment is detected. In actual implementation, the tax payment certificate may include multiple condition parameters, such as identification code, tax payment date, tax payment amount, tax payment category and other information, and multiple verification units are allowed to verify each tax payment certificate. A condition parameter. Only when all condition parameters pass the verification, the security tokens that have been sent to the transfer smart contract are allowed to be transferred to the recipient account. In fact, assuming that the tax is paid on the chain (for example, the payment is made through digital currency on the chain), then it can be directly marked on the chain as a tax payment certificate while paying. It is assumed that the tax is paid in Off-chain (such as receiving physical currency off-chain) requires the party receiving the tax to execute the smart contract, so that the signature or hash value of the tax payment certificate can be uploaded to the chain through the smart contract for verification purposes. Since tax payment can be done on-chain or off-chain, how to detect the completion of tax payment can also be divided into two parts: on-chain tax payment and off-chain tax payment. The former can detect whether the specified account receives tax from tax Human digital currency, the latter requires the tax collector to execute a smart contract after completing the tax collection, so as to provide the signature or hash value of the tax payment certificate on the blockchain, and then other parties can detect whether it is on the blockchain If there is a signature or hash value of the tax payment certificate, if it exists, it means that the payment is completed, otherwise, it means that the payment is not completed.

The transfer module 133 is connected to the tax payment module 132 to execute the transfer request function in the transfer smart contract after detecting that the tax payment certificate is generated, and bring the tax payment certificate into the transfer request function, where the transfer request The function includes verification of the tax payment certificate, and after the tax payment certificate is verified, the security token sent to the transfer smart contract is transferred to the recipient account. Take verification of the tax payment certificate as an example. Assuming that the tax has not been paid, the parameter status of the tax payment certificate in the transfer smart contract can be set to the value "0". Assuming that the tax payment has been completed, the transfer smart contract can be used as the tax payment certificate The parameter status is set to the value "1". In this way, it is possible to know whether the tax payment has been completed by detecting the value of this parameter state. In addition, the parameter status can also store information related to tax payment, such as: tax payment identification code, tax payment date, tax payment amount, tax payment category and other information. These messages can also be digitally signed through financial certificates to facilitate When the supervising host publishes the signature verification smart contract on the blockchain network 110, the digital signature is verified by executing the signature verification smart contract to determine the authenticity of the tax payment certificate. For example, you can store information such as tax payment identification code, tax payment date, tax payment amount, and tax payment type in an array in a smart contract, and after digitally signing these messages with a financial certificate, the generated digital The signature is also stored in the array for verification purposes.

In addition, the share transfer system based on security tokens of the present invention may also include a tax collection host 140. This tax collection host 140 is used as one of the nodes to collect taxes when users pay taxes off-chain. After the tax unit receives the legal currency equivalent to the tax, it executes the off-chain tax payment function of the tax payment smart contract to directly generate the tax payment certificate. In actual implementation, the method of directly generating a tax payment certificate here means that after the tax collector determines that the tax has been received, it directly generates the tax payment certificate by modifying the parameter status of the tax payment smart contract through the tax payment smart contract address, not First, the tax payment smart contract is used to detect whether the digital currency representing the tax has been received, and then the corresponding tax payment certificate is generated based on the received tax.

In particular, it should be noted that, in actual implementation, each module described in the present invention can be implemented in various ways, including software, hardware, or any combination thereof. For example, in some embodiments, each module can be It can be implemented by software and hardware or one of them. In addition, the present invention can also be implemented partially or completely based on hardware. For example, one or more modules in the system can be implemented through integrated circuit chips, System on Chip (SoC), Complex Programmable Logic Device (CPLD), Field Programmable Gate Array (FPGA), etc. are implemented. The invention can be a system, a method and/or a computer program. The computer program may include a computer-readable storage medium loaded with computer-readable program instructions for enabling a processor to implement various aspects of the present invention. The computer-readable storage medium may be a tangible that can hold and store instructions used by an instruction execution device. equipment. The computer-readable storage medium can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (non-exhaustive list) of computer-readable storage media include hard disks, random access memory, read-only memory, flash memory, optical disks, floppy disks, and any suitable combination of the foregoing. The computer-readable storage medium used herein is not interpreted as the instantaneous signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (for example, optical signals through fiber optic cables), or through wires Transmission of electrical signals. In addition, the computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to various computing/processing devices, or downloaded via a network, such as the Internet, a local area network, a wide area network, and/or a wireless network. To an external computer device or external storage device. The network may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, hubs and/or gateways. The network card or network interface in each computing/processing device receives computer-readable program instructions from the network, and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing/processing device middle. The computer program instructions that perform the operations of the present invention can be combined language instructions, instruction set architecture instructions, machine instructions, machine-related instructions, micro instructions, firmware instructions, or source code or object code written in any combination of one or more programming languages (Object Code), the programming language includes object-oriented programming languages, such as: Common Lisp, Python, C++, Objective-C, Smalltalk, Delphi, Java, Swift, C#, Perl, Ruby and PHP, etc., as well as conventional programs Procedural programming language, such as C language or similar programming language. Computer-readable program instructions can be executed entirely on the computer, partly on the computer, executed as a stand-alone software, partly on the client computer and partly on the remote computer, or entirely on the remote computer or server Executed on.

Please refer to "Figure 2A" and "Figure 2B". "Figure 2A" and "Figure 2B" are the method flowcharts of the security token-based share transfer method of the present invention, which is applied in the blockchain network , The steps include: providing a blockchain network 110 composed of multiple nodes, the blockchain network 110 has a transfer smart contract and a tax payment smart contract (step 210); The company-side host 120 generates multiple security tokens on the blockchain network 110 according to the number of shares in advance, and only allows the transfer of security tokens through the transfer of smart contracts (step 220); when the user wants to self-initiate an account When transferring shares to the recipient account, set the transfer amount in the initiator host 130, and the initiator host 130 executes the blockchain transaction to send the security tokens held by the initiator account and the same as the transfer amount to the transfer smart contract , And calculate the tax based on the transfer amount to display and prompt for tax payment (step 230); after the tax is calculated, the initiator host 130 is allowed to execute the tax payment function on the chain of the tax payment smart contract, and the tax payment letter on this chain The formula includes receiving the digital currency sent by the initiator host 130 to pay the tax, and generating a tax payment certificate after detecting that the tax payment is completed (step 240); after the initiator host 130 detects that the tax payment certificate is generated, execute the transfer The transfer request function in the smart contract, and the tax payment certificate is brought into the transfer request function, where the transfer request function contains the verification tax payment certificate, and after the tax payment certificate is verified, it will be sent to the securities for the transfer smart contract The type token is transferred to the recipient account (step 250). Through the above steps, you can provide the blockchain network 110 with the transfer smart contract and the tax payment smart contract, and the company-side host 120 will pre-generate security tokens on the blockchain network 110 according to the number of shares. To transfer shares from the initiator account to the recipient account, first send the security tokens with the same amount of transfer to the transfer smart contract and calculate the tax, and after the tax payment is completed and the tax payment certificate is generated, the initiator host 130 is allowed Execute the transfer smart contract, and transfer the security tokens sent to the transfer smart contract to the recipient's account.

In addition, after step 240, when the tax payment function on the chain does not receive the tax, the tax collector is allowed to execute the tax collection host 140 as one of the nodes after receiving the legal currency equivalent to the tax. The off-chain tax payment function of the tax payment smart contract is used to directly generate the tax payment certificate (step 241). In other words, in the case that the digital currency chain cannot be used to pay taxes, after the tax is paid off-chain, the tax collection host 140 of the tax collection unit executes the off-chain tax payment function of the tax payment smart contract to generate the tax payment. Proof, such as: direct words, symbols, or numerical values are marked as tax paid.

The following description will be given in the form of an embodiment in conjunction with "Figure 3" and "Figure 4". Please refer to "Figure 3" first. "Figure 3" is a schematic diagram of applying the present invention to transfer shares. Assuming that when a user wants to transfer his own shares to another person, he can open the transfer window 300 to transfer a corresponding amount of security tokens, where the transfer window 300 can use different display blocks (311, 312) respectively Display the number and account number of the user (ie: the initiator account). Then, the user can input a value in the input block 321 as the transfer amount, and input the other party's account number (ie, the recipient's account number) in the input block 322. After inputting the value as the transfer quantity, the tax can be automatically calculated and displayed in the display block 313. Next, assuming that the user confirms that they are correct, they can click on the transfer component 323 to enable the initiator host 130 to execute a blockchain transaction to send the security tokens held by the initiator and the same amount as the transfer to the transfer smart contract. , Then, the initiating host 130 executes the on-chain tax payment function of the tax payment smart contract, so that when the on-chain tax payment function receives the digital currency sent by the initiating host, it is deemed to have paid the tax for the corresponding transfer amount, And generate the corresponding tax payment certificate. At this point, the initiator host 130 will detect that the tax payment certificate has been generated, so it executes the transfer request function in the transfer smart contract (such as "requestTransfer()"), and brings the tax payment certificate into the transfer request The transfer request letter verifies the tax payment certificate, and after the tax payment certificate is verified, the security tokens sent to the transfer smart contract are transferred to the recipient’s account. At this point, the transfer of security tokens is completed, and it also represents the completion of the transfer of shares.

As shown in "Figure 4", "Figure 4" is a schematic diagram of applying the present invention to the tax collection host to generate tax payment certificates. In actual implementation, after the tax is calculated, in addition to allowing the initiator host 130 to execute the on-chain tax payment function (such as "payTax()") of the tax payment smart contract to receive the digital currency as tax, if the chain When the tax payment letter has not yet received the tax, the tax collection unit can also be allowed, such as: the National Taxation Bureau, tax collection unit, etc., after receiving the legal currency equivalent to the tax, it will be set in the tax collection The tax collection host 140, which is a unit and one of the nodes of the blockchain network 110, displays a tax collection window 400. The tax collection window 400 displays a unique identification code (or called a tax payment number) and a tax payment date ( Can be taken from the system time), and provide tax personnel to input relevant information in the input block (411, 412), such as: tax type and tax amount. Then, after confirming that it is correct and clicking the confirmation component 413, the off-chain tax payment function of the tax payment smart contract is executed, such as: "uploadTaxPaymentInfo()", and the above data (such as: identification code, tax payment date, payment Tax category and tax payment amount) into this function to directly generate a tax payment certificate on the blockchain network 110, so that the tax payment certificate can be provided to other smart contracts for query and verification. In other words, tax payment can be divided into on-chain and off-chain methods. The on-chain method refers to the "tax payment smart contract" issued by the Ministry of Finance or the supervisory unit (such as the supervisory end host). Accept the public to send digital currency for tax payment; the off-chain method is mainly the traditional payment method, but the tax collection unit can execute the tax payment smart contract on the blockchain network 110 through the tax collection host 140 to register (for example: register to pay Tax category, tax payment date, tax payment amount, etc.) to directly generate payment certificates. In particular, although the above example takes the input of tax payment type and tax amount as an example, the present invention is not limited thereto. In fact, any tax payment related information that can be input does not deviate from the application scope of the present invention. For example, the input related information can also include the signature of the undertaker, the signature of tax payment, and so on.

In summary, it can be seen that the difference between the present invention and the prior art is that by providing a blockchain network with smart contracts for transfer and tax payment, and the company-side host generates it in advance on the blockchain network according to the number of shares. Security tokens, when you want to transfer shares from the originator account to the recipient account, first send the same amount of security tokens to the transfer smart contract and calculate the tax, and after the tax payment is completed and the tax payment certificate is generated , Allowing the initiator host to execute the transfer smart contract, and transfer the security tokens sent to the transfer smart contract to the recipient's account. This technical method can solve the problems of the previous technology and achieve the convenience of taking into account the transfer of shares And the technical effect of legality.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of patent protection shall be subject to the definition of the scope of patent application attached to this specification.

110: Blockchain network 120: company-side host 130: initiator host 131: Send module 132: Tax payment module 133: Transfer Module 140: tax collection host 300: Transfer window 311～313: display block 321, 322: Input block 323: transfer components 400: Tax collection window 411, 412: Input block 413: Determine component Step 210: Provide a blockchain network composed of multiple nodes. The blockchain network has a transfer smart contract and a tax payment smart contract Step 220: A company host as one of the nodes generates multiple security tokens on the blockchain network in advance according to the number of shares, and only allows the transfer of the security tokens through the transfer smart contract Token Step 230: When the user wants to transfer shares from an initiator account to a recipient account, set a transfer amount in an initiator host, and the initiator host performs a blockchain transaction to hold the shares through the initiator account And the security token with the same transfer amount is sent to the transfer smart contract, and a tax is calculated based on the transfer amount for display and prompt payment Step 240: After the tax is calculated, the initiator host is allowed to execute a chain tax payment function of the tax payment smart contract, and the chain tax payment function includes receiving the digital currency sent by the initiator host for payment The tax, and a tax payment certificate will be generated after detecting the completion of the tax payment Step 241: When the tax payment function on the chain does not receive the tax, after receiving the legal currency equivalent to the tax, the tax collector is allowed to execute the tax through a tax collection host as one of the nodes The off-chain tax payment function of the tax payment smart contract is used to directly generate the tax payment certificate Step 250: After the initiator host detects that the tax payment certificate is generated, it executes a transfer request function in the transfer smart contract, and brings the tax payment certificate into the transfer request function, where the transfer request letter The formula includes verifying the tax payment certificate, and after the tax payment certificate is verified, the security token sent to the transfer smart contract is transferred to the recipient account

Figure 1 is a system block diagram of the stock transfer system based on security tokens of the present invention. Figures 2A and 2B are flow charts of the method for transferring shares based on security tokens of the present invention. Figure 3 is a schematic diagram of applying the present invention to transfer shares. Figure 4 is a schematic diagram of using the present invention to generate a tax payment certificate with a tax collection host.

110: Blockchain network

120: company-side host

130: initiator host

131: Send module

132: Tax payment module

133: Transfer Module

140: tax collection host

Claims (10)

A share transfer system based on security tokens, the system includes: A blockchain network consisting of multiple nodes. The blockchain network has a transfer smart contract and a tax payment smart contract; A company-side host, as one of the nodes, is used to generate multiple security tokens on the blockchain network based on the number of shares in advance, and only allow the transfer of the security tokens through the transfer smart contract Currency; and An initiator host, connected to the node or as one of the nodes, the initiator host includes: A sending module is used for when the user wants to transfer shares from an initiator account to a recipient account, set a transfer quantity, and execute a blockchain transaction to transfer shares held by the initiator account to the recipient account. The security tokens with the same transfer amount are sent to the transfer smart contract, and a tax is calculated according to the transfer amount for display and prompt payment; A tax payment module, connected to the sending module, used to allow the execution of the tax payment smart contract after the tax is calculated, a chain tax payment function that includes receiving the initiator host Send the digital currency to pay the tax, and generate a tax payment certificate after detecting the completion of the tax payment; and A transfer module, connected to the tax payment module, used to execute a transfer request function in the transfer smart contract after detecting that the tax payment certificate is generated, and bring the tax payment certificate into the transfer request letter Wherein, the transfer request letter includes verifying the tax payment certificate, and after the tax payment certificate is verified, the security token sent to the transfer smart contract is transferred to the recipient account. According to the first item of the scope of patent application, the share transfer system based on security tokens, wherein the system further includes a tax collection host, the tax collection host as one of the nodes, used as a tax payment function on the chain When the tax is not received, the tax collector is allowed to execute the off-chain tax payment function of the tax payment smart contract after receiving the legal currency equivalent to the tax, to directly generate the payment Tax certificate. According to the first item of the scope of patent application, the share transfer system based on security tokens, each node is connected to each other by a peer-to-peer connection, and a supervisory host as one of the nodes is on the blockchain network Publish the transfer smart contract and the tax payment smart contract; or the supervisor host publishes the transfer smart contract, and a tax host as one of the nodes publishes the tax payment on the blockchain network Smart contract. According to item 3 of the scope of patent application, the stock transfer system based on security tokens, where the supervisory host publishes a signature verification smart contract and a tax payment list smart contract on the blockchain network, and the signature verification smart The contract is used to verify the digital signature of the tax payment certificate generated by the tax payment letter under the chain. The tax payment list smart contract provides the tax payment smart contract to register a tax payment smart contract address. When the tax payment list smart contract When there is the tax payment smart contract address in it, it is judged that the tax payment certificate has passed the verification. According to the first item of the scope of patent application, the share transfer system based on security tokens, wherein the transfer smart contract and the tax payment smart contract respectively have a corresponding contract address and a common standard interface, through the contract address And the standard interface allows the transfer smart contract and the tax payment smart contract to transfer messages and call functions to each other. A method for transferring shares based on security tokens, the steps include: Provide a block chain network composed of multiple nodes, the block chain network has a transfer smart contract and a tax payment smart contract; A company host as one of the nodes generates multiple security tokens on the blockchain network in advance according to the number of shares, and only allows the transfer of the security tokens through the transfer smart contract; When a user wants to transfer shares from an initiator account to a recipient account, set a transfer amount on an initiator host, and the initiator host performs a blockchain transaction to transfer shares held by the initiator account and share The security tokens with the same transfer amount are sent to the transfer smart contract, and a tax is calculated according to the transfer amount for display and prompt payment; After calculating the tax, allow the initiator host to execute a chain tax payment function of the tax payment smart contract, the chain tax payment function including receiving digital currency sent by the initiator host to pay the tax, and Generate a tax payment certificate after detecting the completion of the tax payment; and After the initiator host detects that the tax payment certificate is generated, it executes a transfer request function in the transfer smart contract, and brings the tax payment certificate into the transfer request function, where the transfer request function includes verification The tax payment certificate, and after the tax payment certificate is verified, the security token sent to the transfer smart contract is transferred to the recipient account. According to the 6th item of the scope of patent application, the method for transferring shares based on security tokens, the method further includes that when the tax payment function on the chain does not receive the tax, the tax collection unit is allowed to receive the equivalent value of the tax. After the legal currency of, execute the off-chain tax payment function of the tax payment smart contract through a tax collection host as one of the nodes to directly generate the tax payment certificate. According to the 6th item of the scope of patent application, the stock transfer method based on security tokens, wherein each node is connected to a point-to-point connection, and a supervisory host as one of the nodes is on the blockchain network Publish the transfer smart contract and the tax payment smart contract; or the supervisor host publishes the transfer smart contract, and a tax host as one of the nodes publishes the tax payment on the blockchain network Smart contract. According to the 8th item of the scope of patent application, the stock transfer method based on security tokens, the supervisory host publishes a signature verification smart contract and a tax payment list smart contract on the blockchain network, and the signature verification smart The contract is used to verify the digital signature of the tax payment certificate generated by the tax payment letter under the chain. The tax payment list smart contract provides the tax payment smart contract to register a tax payment smart contract address. When the tax payment list smart contract When there is the tax payment smart contract address in it, it is judged that the tax payment certificate has passed the verification. According to the 6th item of the scope of patent application, the share transfer method based on security tokens, wherein the transfer smart contract and the tax payment smart contract respectively have a corresponding contract address and a common standard interface, through the contract address And the standard interface allows the transfer smart contract and the tax payment smart contract to transfer messages and call functions to each other.

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