WO2020114242A1

WO2020114242A1 - Token conversion method based on public blockchain and blockchain system

Info

Publication number: WO2020114242A1
Application number: PCT/CN2019/119533
Authority: WO
Inventors: 白杰; 吴先锋; 李冬云
Original assignee: 白杰
Priority date: 2018-12-07
Filing date: 2019-11-19
Publication date: 2020-06-11
Also published as: JP6979736B2; NL2024367B1; CN111369353A; JP2021530065A; NL2024367A

Abstract

Disclosed are a token conversion method based on public blockchain and a blockchain system. In the practical use, a plurality of supply chains issue a supply transaction to a public blockchain, the supply tokens are converted into equal-value public blockchain tokens, and the public blockchain stores and records the supply amount of the received supply tokens; a conversion chain issues a conversion transaction to the public blockchain, the public blockchain calculates the conversion rate according to the supply amount of initial tokens and conversion tokens, extracts conversion tokens having equal value as the initial tokens from the stored supply tokens, and transfers to the conversion chain. In the method, the conversion rate between two kinds of tokens is calculated by means of the public blockchain, thus providing a relatively objective conversion environment. After a supply transaction occurs, the supply tokens are stored by means of the public blockchain, so that the conversion chain only transacts with the public blockchain during the conversion transaction and is not required to contact with the conversion counterparts, thereby avoiding centralized program or platform participation and improving conversion efficiency.

Description

Public chain-based certificate exchange method and blockchain system

This application requires the priority of the Chinese patent application filed on December 07, 2018 in the China Patent Office with the application number 201811496915.0 and the invention titled "Public Chain-based Exchange and Exchange Method and Blockchain System", all of which are approved by The reference is incorporated in this application.

Technical field

This application relates to the field of network transaction technology, and in particular to a public chain-based certificate exchange method and blockchain system.

Background technique

Blockchain technology is a relatively objective non-repudiation digital environment created based on the decentralized system application architecture and public consensus. Based on the blockchain technology, the authenticity of the network information can be guaranteed. For example, if a transaction occurs in the blockchain network, the nodes in the blockchain network will generate block data that records the transaction content based on the transaction information, and the block The data is broadcast throughout the network, and other nodes in the network store block data at the same time, forming an unchangeable blockchain. Among them, the transaction has a broad sense, not referring to "commodity trading" or "item exchange" in the traditional sense, but refers to a certain data operation content or operation result on the blockchain network, for example, a certain The blockchain node A initiates a query request a for the performance of a certain type of communication device, and the query request a is a transaction for the blockchain node B that undertakes the query service. Empathy. It is also a transaction that node B sends the performance table b of the communication device of the model obtained to the node A to the query. Information A, a and information B, b will be written into the data block of the blockchain as transaction information.

Generally, transactions in the blockchain network will use a digital token as a marker for network transactions, used to measure the degree of attention or value of the transaction operation itself or calibrate the transaction data, for example, Bitcoin Network bitcoin, Ethereum network Ether. Generally, different blockchain networks use different types of certificates. As a symbol of network transactions, different types of exchanges need to be exchanged, so that the use of A-blockchain network A and B-blockchain network B, through A-block and B-block Information or value transfer between two blockchain networks.

The traditional STO exchange operation is completed by STO exchange, which provides a trading center in the form of an exchange in the network, and the trading center provides an exchange platform between different STOs so that both parties involved in the exchange can follow a certain exchange ratio , In exchange for the number 1 A-share pass for the quantity 2 B-share pass.

In the existing exchange methods, the exchange operation between the two types of securities passes depends on the traditional exchange platform or a third-party platform, and the exchange ratio also depends on the exchange platform or the third-party platform (such as the bank). Since the exchange platform or third-party platform is essentially a centralized platform, it is vulnerable to network attacks and security is difficult to guarantee. In addition, the traditional exchange platform needs to determine the exchange counterparty. When the exchange party of the exchange party is the relatively uncommon stock exchange, it takes a long time to find the exchange opponent and determine the exchange ratio between the stock exchanges, which will cause the exchange process to consume a long time. Not only can the exchange not be completed in time, it will also consume more network resources and reduce the exchange efficiency.

Summary of the invention

This application provides a public chain-based exchange method and block chain system to solve the problem that the traditional exchange method is controlled by a centralized program and the exchange efficiency is low.

In the first aspect, the present application provides a public chain-based exchange method for stock exchange, which is applied to the public chain network and includes

Receiving a supply transaction initiated by the supply chain, the supply transaction including the type and number of supply certificates transferred to the public chain;

Query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio between the supply chain and the public chain stock chain based on the supply volume of the supply chain;

According to the exchange ratio of supply certificate and public chain certificate, transfer to the supply chain and the value of the supply chain of the same value of the public chain certificate;

Receive an exchange transaction initiated by the exchange chain, where the exchange transaction includes the initial number of exchanges and the type of exchange exchanges transferred to the public chain;

Query the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculate the exchange ratio of the exchange stock exchange and the initial stock exchange based on the supply volume;

According to the exchange ratio between the exchange pass and the initial pass, transfer the exchange pass with the value equal to the number of the initial pass to the exchange chain.

Optionally, the steps of querying the supply volume of the supply chain in the public chain network and calculating the exchange ratio of the supply chain and the public chain stock chain according to the supply volume of the supply chain include:

Receive the pledge certificate pass of the supply chain transfer, the pledge certificate pass includes a predetermined number of supply certificate passes to the public chain and the public chain certificate passes to the public chain at the same time;

Calculate the initial exchange ratio based on the quantitative relationship between the supplied pledge certificates, the supply certificates and the public chain certificates;

The initial conversion ratio is stored, and based on the initial conversion ratio, the conversion ratio is adjusted in real time according to the number of subsequent supply pass transfers.

Optionally, before the step of receiving a supply transaction initiated by the supply chain, the method further includes:

Verify the supply qualification of supply chain supply certificates connected to the public chain network through the number of public chain certificates issued by the supply chain;

If the number of public chain certificates passed by the supply chain is greater than or equal to the verification threshold, it is determined that the supply chain has supply qualifications and the supply transaction initiated by the supply chain is received;

If the number of public chain certificates issued by the supply chain is less than the verification threshold, determine that the supply chain does not have supply qualifications, send verification prompts to the supply chain, and store the types of supply certificates that the supply chain can provide.

Optionally, the steps of querying the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculating the conversion ratio of the exchange stock exchange and the initial stock exchange according to the supply volume include:

Determine whether the initial stock exchange is a public chain stock exchange;

If the initial stock exchange is a public chain stock exchange, query the supply of exchange stocks in the public chain network;

Calculate the exchange ratio of exchange certificates to public chain certificates according to the supply of exchange certificates;

If the initial stock exchange is not a public chain stock exchange, query the supply of the initial stock exchange and exchange stock exchange in the public chain network;

Calculate the exchange ratio between the initial stock exchange and the public chain stock exchange according to the supply of the initial stock exchange;

Calculate the exchange ratio between the exchange pass and the initial pass.

Optionally, before the step of receiving the supply transaction initiated by the supply chain, verify whether the supply chain is configured with smart contracts that comply with the public chain exchange rules. If the supply chain is not configured with smart contracts, the steps of configuring the smart contract to the supply chain include:

Determine whether the supply chain supports the configuration of smart contracts;

If the supply chain supports the configuration of smart contracts, configure smart contracts to the supply chain;

If the supply chain does not support the configuration of smart contracts, configure a parallel chain to the supply chain, which is a part of nodes in the public chain network;

Configure smart contracts for parallel chains so that the parallel chain initiates supply transactions to the public chain.

In the second aspect, the present application provides a public chain-based exchange method for securities, which is applied to the supply chain network and includes:

Initiate a supply transaction to the public chain, the supply transaction includes the type of supply pass and the number of supply passes transferred to the public chain;

The receiving public chain calculates based on the supply volume of the supply pass, and the exchange ratio of the supply pass to the public link pass confirms whether the transaction is completed;

After confirming the completion of the transaction, the public chain transfer that has the same value as the number of supply certificate transfers received from the public chain transfer.

Optionally, the receiving public chain calculates the supply ratio of the supply pass, the exchange ratio between the supply pass and the public link pass, and the steps to confirm whether the transaction is completed include:

Initiate supply transactions to the parallel chain corresponding to the supply chain;

Control the parallel chain to generate a query transaction based on the supply transaction and initiate a query transaction to the public chain, so that the public chain returns the exchange ratio between the supply certificate and the public chain certificate to the parallel chain according to the query transaction;

Control the parallel chain to calculate the number of available public chain certificates and send the number of public chain certificates to the supply chain based on the exchange ratio between supply certificates and public chain certificates.

Receive the number of public chain certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate supply transactions to the public chain.

In the third aspect, the present application provides a public chain-based exchange method for exchanges, which is applied to the exchange chain network and includes:

Initiate an exchange transaction to the public chain. The exchange transaction includes the initial number of exchanges and the type of exchange exchanges transferred to the public chain;

The receiving public chain calculates based on the supply of the initial stock exchange and the exchange stock exchange, the conversion ratio of the exchange stock exchange and the public chain stock exchange, and confirms whether the transaction is completed;

After confirming the completion of the transaction, if the transfer from the public chain is received, the exchange certificate of the same value as the number of public chain certificates will be received.

Optionally, the receiving public chain calculates the conversion ratio of the exchange stock exchange and the public chain stock exchange based on the supply of the stock exchange stock exchange, and the steps to confirm whether the transaction is completed include:

Initiate the exchange transaction through the parallel chain corresponding to the exchange chain;

Control the parallel chain to generate a query transaction based on the exchange transaction, and initiate a query transaction to the public chain, so that the public chain returns the conversion ratio of the exchange certificate to the initial certificate to the parallel chain according to the query transaction;

Control the parallel chain to calculate the number of available exchange passes based on the exchange ratio of the exchange pass and the initial pass, and send the number of exchange passes to the exchange chain;

Receive the number of exchange certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate the exchange transaction to the public chain.

In the fourth aspect, the present application provides a public blockchain-based blockchain system, including: a public chain, and a supply chain and an exchange chain connected to the public chain network. The public chain, the supply chain, and the exchange chain are all peer-to-peer networks;

Wherein, the supply chain is configured to: initiate a supply transaction to the public chain, and the supply transaction includes the type and number of supply certificates that are transferred to the public chain; and, the public chain certificate that receives transfers from the public chain;

The exchange chain is configured to initiate an exchange transaction to the public chain, and the exchange transaction includes the initial number of exchanges and types of exchanges to be transferred to the public chain; and, the exchange exchange to receive transfers from the public chain;

The public chain is configured to: receive supply transactions initiated by the supply chain; query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio between the supply chain and the public chain chain based on the supply volume of the supply chain; based on The exchange ratio of supply certificate to public chain certificate, transfer to the supply chain and the value of the supply chain to the public chain certificate;

And, receive the exchange transaction initiated by the exchange chain; query the supply of the exchange certificate and the initial certificate in the public chain network, and calculate the exchange certificate and the initial certificate according to the supply of the exchange certificate and the initial certificate Exchange ratio; according to the exchange ratio between the exchange pass and the initial pass, transfer the exchange pass to the exchange chain and the number of the initial pass is equal to the exchange pass.

As can be seen from the above technical solutions, this application provides a public chain-based certificate exchange method and blockchain system. In practical applications, multiple supply chains initiate supply transactions to the public chain to transfer their respective supply The stock exchange is converted into an equal value public chain stock exchange. The public chain stores and records the supply of various supply stock transfers in the supply chain transfer; the exchange chain initiates the exchange transaction to the public chain to make the public chain according to the exchange transaction. Specify the supply amount of the initial stock exchange and the exchange stock exchange, calculate the conversion ratio, and then extract the exchange stock equivalent to the initial stock exchange from the stored supply stock exchange and transfer it to the exchange chain. The method uses the public chain to judge the exchange ratio between different securities, which can provide an objective and reasonable exchange environment. And after the supply transaction occurs, the supply certificate is stored through the public chain, so that when the exchange chain performs the exchange transaction, the transaction only occurs with the public chain. There is no need to contact the exchange counterparty to avoid the participation of the centralized program and improve the exchange efficiency.

BRIEF DESCRIPTION

FIG. 1 is a schematic flow chart of the application of the certificate exchange method applied to the public chain network;

Figure 2 is a schematic diagram of the process of applying for supply transactions in the supply chain;

Figure 3 is a schematic diagram of the application transaction process with a pledge period;

Figure 4 is a schematic diagram of the process of determining whether the contract is supported by the application supply transaction;

Figure 5 is a schematic diagram of the flow of the application to complete the supply transaction through the parallel chain;

Figure 6 is a schematic diagram of the process of applying for verification of supply chain supply qualification;

Figure 7 is a schematic diagram of the flow of the exchange chain for redemption transactions;

Figure 8 is a schematic diagram of the process of calculating the exchange ratio in the application for exchange transactions;

9 is a schematic diagram of the flow of the application to complete the exchange transaction through the parallel chain;

FIG. 10 is a schematic diagram of the structure of a public exchange-based block chain system based on the application.

detailed description

In the technical solution provided by this application, a blockchain network refers to a peer-to-peer (P2P) network with a decentralized application architecture. The blockchain network is capable of distributed storage, public consensus, digital encryption, transaction accounting, and verification. That is, a trading platform covering distributed technology, cryptography, P2P network architecture, and various consensus algorithms that may be applied. Blockchain or blockchain information refers to the accounting information generated based on the transaction information when transactions occur in the blockchain network, that is, multiple specific transactions form a block, and multiple blocks form a block chain. The blockchain network includes nodes that establish peer-to-peer network connections with each other. Each node is configured with a corresponding consensus mechanism, such as a smart contract, and has sufficient computing power to conduct transaction verification and accounting procedures. Nodes also have interface specifications that conform to a unified standard to enable access to more nodes or other types of blockchain networks through the interface specifications.

In this application, the mentioned public chain, exchange chain, supply chain, and parallel chain refer to different blockchain networks that comply with blockchain technology. Unless otherwise stated in this application, public chain, exchange chain, supply chain and parallel chain refer to corresponding networks, namely public chain network, exchange chain network, supply chain network and parallel chain network. Among them, the public chain network is a basic platform arranged in the entire network, and its node interfaces are connected to multiple blockchain networks, such as industry chains, alliance chains and private chains and third-party blockchain networks built based on the public link port specifications. . Each blockchain network can serve as an independent development platform and provide corresponding services within its network. Among them, the definition and specification of the public chain has a standard interface method to facilitate network connection with other blockchains, such as the exchange chain and the supply chain. The public chain in this application has the ability to support cross-chain intermediary, and also has the ability to store certificates, decentralized applications and smart contracts.

The exchange chain and supply chain refer to the blockchains connected to the public chain network, that is, in this application, the public chain provides the basic platform, and the exchange chain and supply chain as the access blockchain network have their own functions and services . The exchange chain and supply chain can be a blockchain network built on the basis of public chain network standards and interface specifications, that is, the exchange chain and supply chain can directly communicate and service dock with the public chain network. The exchange chain and supply chain can also be separate networks with their own proprietary interface specifications, such as the existing blockchain network Bitcoin, Ethereum, etc., or industry chains and alliance chains developed by certain industries, or even It is a private chain built to meet certain service needs. These existing blockchains, industry chains, alliance chains, and private chains are due to their proprietary network interface specifications. Generally, they cannot directly trade with each other or even with the public chain network. Therefore, in this application, parallel chains can be used to connect the public chain with other networks.

The parallel chain can be composed of some nodes in the public chain network, and the parallel chain can bridge the public chain with other networks that cannot be directly traded. In this application, for a network that cannot be directly traded, each blockchain network corresponds to a parallel chain. The parallel chain is set to have the complete function of the corresponding blockchain network and can synchronize the transactions in the blockchain network. Transform and transfer to the public chain network. Therefore, in the technical solution provided by the present application, the parallel chain can be determined as a mirror image of the corresponding blockchain network, and for convenience of description, the corresponding blockchain network becomes the parent chain. In this application, the parallel chain is composed of some nodes in the public chain network, and these nodes are also nodes in the parent chain to transfer transaction information.

Based on the above components, the public chain can provide cross-chain relays in actual applications, complete transaction verification, data certification, asset transfer, and smart contract execution. The unified external interface specification of the public chain can enable other blockchain networks to quickly access the public chain network. The public chain also provides the basic blockchain platform capabilities, that is, quickly complete the deployment and verification of the plan, and complete the distributed storage and accounting procedures in the public chain network. In addition, as a basic platform, the public chain can also provide public development functions, so as to complete the collaborative development and deployment of multiple parallel chain smart contracts at one time.

In addition to recording its own blockchain information, the public chain can also be used to store information summaries of corresponding cross-chain transactions, that is, transaction summaries. Record related content of cross-chain transactions through formatted transaction data. At the same time, in order to reduce the occupation of distributed storage space on the public chain, when the public chain records certain information, it can also record third-party blockchain information through a specific compression algorithm. For example, the block data formed and stored in the public chain may include the following content: block identification (such as sequence number, time stamp, block hash value, and previous block hash value), block attribution (ie, block generator ), other information of the block (such as random value, difficulty value and additional information, etc.), block weight, information summary (such as transaction tree, status tree, receipt tree and data tree, etc.), transaction fees, rewards, size, etc.

Referring to FIG. 1, it is a schematic flow chart of a method of stock exchange conversion applied to a public chain network. As can be seen from FIG. 1, the method of exchange for securities provided by this application, when applied to the public chain network, includes the following steps:

S11: Receive a supply transaction initiated by the supply chain, where the supply transaction includes the type and number of supply certificates transferred to the public chain;

S12: Query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio between the supply chain and the public chain stock chain based on the supply volume of the supply chain;

S13: According to the exchange ratio of the supply certificate and the public chain certificate, transfer the value to the supply chain and the value of the supply chain to the public chain certificate.

The purpose of the above steps is to complete the supply operation between supply chain and public chain, that is, supply transaction. As shown in Figure 2, to complete the supply transaction, the supply chain is configured to perform the following procedural steps:

S21: Initiate a supply transaction to the public chain. The supply transaction includes the types of supply certificates and the number of supply certificates transferred to the public chain;

S22: The receiving public chain calculates based on the supply volume of the supply certificate, the exchange ratio of the supply certificate and the public chain certificate, and confirms whether the transaction is completed;

S23: After confirming the completion of the transaction, the public chain transfer with the same value as the supply of the number of public chain transfers received from the public chain transfer.

From the above steps, in the technical solution provided by this application, before the exchange chain initiates the exchange transaction, the transfer transaction is completed between the supply chain and the public chain, and the certificate circulation in the supply chain is transferred to the public chain to participate in the subsequent exchange transaction. That is to say, in actual application, the supply chain first initiates a supply transaction to the public chain, and the supply transaction includes the types of supplied securities and the number of securities that can be supplied. For example, on the public chain network P, a total of access to network A ~ network F, these six blockchain networks, in network A ~ network F, the respective types of circulation of securities (or the type of securities that support outbound exchange transactions ) Are Ta, Tb, Tc, Td, Te, and Tf, respectively. When one of the blockchain networks, such as network C, is going to conduct supply transactions for securities trading, the node in network C that is responsible for cross-chain transactions (this application can be called a supply node) first initiates supply transactions to the public chain network, namely The supply chain performs the steps of S21 above. The supply transaction includes the type of supply pass that is transferred to the public chain, that is, Tec Tc; and the number of supply passes that are transferred, for example, 1000 Tc Tc transferred to the public chain.

After the supply chain initiates a supply transaction, the public chain executes step S11, and then inquires the supply quantity of the supply certificate through the public chain network according to the content of the supply transaction. In practical applications, the same kind of supply certificate can come from one blockchain network or multiple blockchain networks. Therefore, for supply transactions initiated by the supply chain, you can first query whether the current public chain network has been stored. Corresponding supply pass. For example, after receiving the supply transaction, the public chain P extracts the type of supply certificates in the supply transaction as Tc, and the number of supply certificates is 1000. The public chain P then queries the certificates from various supply certificates stored in the public chain network. Tc, if the current supply Tc number is 1053, then the current supply of supply pass is determined to be 1053, and the public chain calculates the current value based on this supply value and the public chain pass Tp issued by the public chain. The exchange ratio of time supply Tec Tc to public chain Tec Tp.

In the technical solution provided by this application, the specific method for calculating the exchange ratio between the supply certificate Tc and the public chain certificate Tp according to the supply volume can be a calculation method agreed by the public chain, or a value exchange agreement that has been recognized by consensus. Such as bancor agreement. In practical applications, the method of calculating the exchange ratio by supplying the supply of Stock Connect can further consider other factors to further weight the calculation, such as the weight of the degree of circulation, and the weight of the stability of the value of the blockchain network.

It should be noted that, in order to prevent the supply of the supply chain of the public chain network from being 0 or too low, causing the exchange rate to be abnormal or extremely uneven value fluctuations, the technical solutions provided in this application can be When each blockchain network accesses the public chain network, the way of the on-line conditional constraints allows the connected blockchain network to transfer part of the supply certificate to the public chain as the reserve quantity of the supply certificate type, the specific reserve quantity value It can be determined according to the size of the accessed blockchain.

Further, as shown in FIG. 3, the steps of querying the supply volume of the supply chain in the public chain network, and calculating the exchange ratio of the supply chain through the supply chain of the supply chain include:

S131: Receive a pledge certificate pass for supply chain transfers, the pledge certificate pass includes a predetermined number of supply certificate passes to the public chain and a public chain certificate pass to the public chain at the same time;

S132: Calculate the initial exchange ratio based on the quantitative relationship between the supplied pledge certificate and the supply certificate and the public chain certificate;

S133: Store the initial conversion ratio, and based on the initial conversion ratio, adjust the conversion ratio in real time according to the number of subsequent supply pass transfers.

That is to say, in this embodiment, a supply chain corresponding to a supply pass as an exchange party for this supply pass needs to transfer the supply pass to the public chain and pledge a part of the public link pass to the public chain, namely to Public chain transfer pledge certificate pass, which includes a preset number of supply certificate passes to the public chain and a public chain certificate pass to the public chain at the same time. After receiving the pledge certificate, the public chain can calculate the initial exchange ratio based on the quantitative relationship between the supply certificate and the public chain certificate. That is to say, in the technical solution provided by this application, the initial exchange ratio requires the project party to pledge supply certificate and public certificate on the public chain. And at the subsequent supply node, based on this initial pledge, it can decide whether to sell the supply certificate and get the public chain certificate; or to buy the supply certificate and sell the public chain certificate. For the convenience of description, after the supply chain transfers the pledged certificate pass, a pool for the exchange of stock passes can be formed in the public chain. This pool has supply stock exchanges and public chain stock exchanges to support exchange transactions. This pool can be understood as the concept of financial reserves.

As the exchange transaction progresses, the exchange ratio between the supply certificate and the public chain certificate will be updated in real time. That is, in the initial situation, the access nodes in the supply chain provide a preset number of supply certificates and the corresponding public chain certificates through the smart contract provided by the public chain to determine the corresponding exchange ratio. For example, the supply chain provides 1000 supply certificates and 10 public chain certificates at the same time, and the corresponding exchange ratio is determined to be 100:1. This part of the initial supply of securities will be used as reserve securities. In subsequent applications, the smart contract can be called multiple times, and each call completes a pass exchange, and the corresponding exchange ratio can be updated through non-stop exchange.

Since there is no exchange opponent, the exchange will be directly reserved, and the exchange ratio is the current real-time ratio. If the reserve pass is exhausted, it will be manifested in two situations: one case is that the supply pass is exhausted and overbought, then the supply pass is in short supply, and the supply pass will appreciate, so it will encourage the access chain network to provide supply Stock exchange, otherwise the price will increase consistently; another situation is that the public chain stock exchange corresponding to the reserve stock exchange is exhausted and oversold, then the supply stock exchange is sold off and the price collapses, which will cause the value of the supply stock exchange to return to zero. . Therefore, under this mechanism, all parties involved in the exchange of Securities will do their utmost to maintain a fair exchange ratio and ensure the interests of all parties. In this embodiment, through the above-mentioned method of updating the exchange ratio, it is possible to protect the interests of various exchange participants as much as possible, ensure the maintenance of the value of their own certificate, and maintain the safety and fairness of the public chain itself.

It can be seen from the above technical solutions that, before the technical solutions provided by this application, the blockchain network connected to the public chain network initiates a supply transaction to supply various types of securities before the exchange of the securities. It can be seen that the supply chain as the seller can exchange the pre-sold stock pass through the public chain to the public chain stock pass, and then store the sold stock pass through the public chain, so that there is no need to purchase counterparties to complete the exchange transaction. Greatly increase the selling efficiency of the supply of securities.

In this application, when the supply chain initiates a supply transaction to the public chain, the supply node within the supply chain will generate a block data that conforms to the supply chain network transaction specifications based on the supply transaction information, and the block data will be formed in the supply chain network. Broadcast with the public chain network to form a complete blockchain in the supply chain network. The nodes in the public chain re-verify the block data, and form or further transform into block data that conforms to the public chain transaction specifications, so that after broadcasting in the public chain network, a complete, public chain network-based blockchain is formed To complete the billing operation.

In the same way, after the public chain calculates the exchange ratio, according to the exchange ratio and the number of supply certificate transfers to the supply chain, the value of the public chain certificate pass, the nodes in the public chain responsible for the transfer form a zone that meets the public chain transaction specifications Block data, and broadcast the block data in the public chain network to form a complete block chain. At the same time, the block data is sent to the supply chain network together with the transfer operation. The block data will be broadcast again from the supply chain network to form a complete block chain to complete the billing operation.

In this embodiment, as the public chain transfers to the supply chain and the value of the supply chain is equal to the time of the public chain certificate, the block data contains timestamp information, so the time of the first block data can be The stamp is used as the timing start time, and can also form a complete blockchain, that is, the timestamp of the last blockchain is used as the timing start time. When the timing time reaches the time corresponding to the pledge period, the nodes in the public chain network initiate a refund transaction to the supply chain. It is also necessary to query the supply amount of the supply certificate in the public chain network, and calculate the real-time exchange ratio according to the supply amount, and according to the exchange The ratio returns the supply certificate to the supply chain.

In practical applications, since the blockchain network connected to the public chain network can be used as a supply chain to initiate supply transactions to the public chain, different blockchain networks often have their own dedicated interface specifications and require special consensus methods. Only smart contracts or public contracts can complete transactions with the public chain. Therefore, in some embodiments provided in this application, before receiving the supply chain-initiated supply transaction step, it is necessary to verify whether the supply chain is configured with a smart contract that conforms to the public chain exchange rules. If the corresponding smart contract is configured, then directly Initiate and complete supply transactions through smart contracts; if the supply chain is not configured with smart contracts, as shown in Figure 4, the method further includes:

S101: determine whether the supply chain supports the configuration of smart contracts;

S102: If the supply chain supports the configuration of smart contracts, configure smart contracts to the supply chain;

S103: If the supply chain does not support the configuration of smart contracts, configure a parallel chain to the supply chain, and the parallel chain is a part of nodes in the public chain network;

S104: Configure a smart contract for the parallel chain, so that the parallel chain initiates supply transactions to the public chain.

In this embodiment, you can first determine whether the supply chain supports the configuration of smart contracts. For supply chains that support the configuration of smart contracts, for example, for a blockchain network that is first launched to the public chain network and has the same interface specifications as the public chain network, It may support the configuration of smart contracts, therefore, smart contracts can be configured for this supply chain through the public chain. For the supply chain that does not support the configuration of smart contracts, some public chain nodes can be selected as parallel chains of the supply chain for the supply chain that accesses the public chain according to predetermined rules or the principle of proximity in the public chain. As a parallel chain node, it can be configured to have all the functions and information of the public chain and the supply chain at the same time, and have a bridging role in order to complete the supply transaction and transfer operation between the supply chain and the public chain.

After configuring the parallel chain for the supply chain, the public chain can configure smart contracts for the parallel chain. Since the parallel chain is a part of the nodes in the public chain, configuring the smart contract for the parallel chain only requires setting the corresponding supply chain in the smart contract Information, giving the parallel chain a bridge function, so that the supply chain can initiate supply transactions to the public chain through the parallel chain. It should be noted that the parallel chain nodes can come from the public chain network, can also come from the supply chain network, it can also come from the public chain network, partly from the supply chain network. For the nodes from the supply chain network, after the supply chain determines which nodes are parallel chain network nodes, the public chain verifies the nodes and determines that the nodes as parallel chains can support the public chain network specifications.

In some embodiments of the present application, when the blockchain network is connected to the public chain through parallel links, the supply chain network cannot directly complete the transaction with the public chain. Therefore, as shown in FIG. 5, when receiving the public chain according to the supply certificate The calculation of the supply amount of the pass, the exchange ratio of the supply of the stock exchange and the public chain stock exchange, and the steps to confirm whether the transaction is completed include:

S221: Initiate supply transaction to the parallel chain corresponding to the supply chain;

S222: Control the parallel chain to generate a query transaction according to the supply transaction, and initiate a query transaction to the public chain, so that the public chain returns the exchange ratio of the supply certificate to the public chain certificate to the parallel chain according to the query transaction;

S223: Control the parallel chain to calculate the number of public chain certificates that can be obtained and send the number of public chain certificates to the supply chain according to the exchange ratio between supply certificates and public chain certificates.

S224: Receive the number of public chain certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate supply transactions to the public chain.

In this embodiment, after the supply chain initiates the supply transaction through the parallel chain, the parallel chain can generate a query transaction for the public chain according to the supply transaction. The query transaction can be a transaction of a prescribed form, such as a transaction with a number of transaction passes , Or a transaction in the form specified by a smart contract, the inquiry transaction needs to be accompanied by supply certificate type information. After receiving the inquiry transaction, the public chain returns the exchange ratio between the supply certificate and the public chain certificate to the parallel chain according to the inquiry transaction. The parallel chain then passes the returned exchange rate to the supply chain, or calculates the number of public chain certificates that can be exchanged based on the supply transaction and the conversion ratio, and sends the available number of public chain certificates to the supply chain (or supply node) .

After receiving the number of public chain certificates issued by the parallel chain, the supply chain can judge it to determine whether it can accept such exchange results. If the supply chain can accept the exchange result, the parallel chain can be controlled to send the supply transaction to the public chain. If the exchange result is not accepted, the parallel chain can be controlled to withdraw the supply transaction.

Further, in order to ensure the value stability of the supply certificate, that is, before receiving the supply transaction initiated by the supply chain, the public chain needs to verify the supply certificate of the supply chain, as shown in Figure 6, the specific supply qualification verification The method includes the following steps:

S105: verify the supply qualification of the supply chain supply certificate connected to the public chain network through the number of public chain certificates issued by the supply chain;

S106: If the number of public chain certificates passed by the supply chain is greater than or equal to the verification threshold, it is determined that the supply chain has supply qualifications, and the supply transaction initiated by the supply chain is received;

S107: If the number of public chain certificates issued by the supply chain is less than the verification threshold, determine that the supply chain does not have supply qualifications, send verification prompts to the supply chain, and store the types of supply certificates that the supply chain can provide.

In this embodiment, it can be set that when each blockchain network accesses the public chain, it is necessary to obtain a certain number of public chain certificates in the public chain as the transaction capital of the blockchain network, so it has the ability or large For a large-scale blockchain network, the number of public chain certificates needed to be owned should be relatively large, and then the supply qualification of the supply certificate should be judged by the number of public chain certificates issued by the supply chain. By verifying the supply qualification of the supply chain, large fluctuations in the supply quantity can be avoided, and the occurrence of abnormalities in the exchange rate can be reduced. At the same time, the verification of the supply chain's supply qualification can also avoid individual small blockchain networks, such as private chains, issuing false certificates, and avoiding the destruction of the exchange stability of the public chain system.

In the technical solution provided by this application, the supply chain supplies different types of certificates to the public chain, and stores them in the public chain, so as to access other blockchain networks in the public chain network for exchange. Obviously, in this application, the supply chain and the exchange chain refer to the roles played when performing different types of operations. As for the blockchain network connected to the public chain network, as long as it can meet the corresponding certification supply qualification, it can be used as the supply chain. At the same time, all the blockchain networks connected to the public chain network can also be used as exchange chains to the public. The chain initiates the exchange transaction to obtain the required securities. As shown in Figure 1, for exchange transactions, the public chain is configured to perform the following procedure steps:

S14: Receive an exchange transaction initiated by the exchange chain, where the exchange transaction includes the initial number and type of exchange certificates transferred to the public chain;

S15: Query the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculate the exchange ratio of the exchange stock exchange and the initial stock exchange based on the supply volume;

S16: According to the exchange ratio between the exchange pass and the initial pass, transfer the exchange pass with the value equal to the number of the initial pass to the exchange chain.

Accordingly, when performing an exchange transaction operation, as shown in FIG. 7, the exchange chain is configured to perform the following procedure steps:

S31: Initiate an exchange transaction to the public chain, where the exchange transaction includes the number of initial certificates and the type of exchange certificates transferred to the public chain;

S32: The receiving public chain calculates the conversion ratio between the exchange stock exchange and the public chain stock exchange based on the supply of the initial stock exchange and the exchange stock exchange to confirm whether the transaction is completed;

S33: After confirming the completion of the transaction, receiving the transfer of the public chain, the exchange certificate of the same value as the number of public chain certificates.

In the technical solution provided by this application, the block chain network as the exchange chain first initiates the exchange transaction to the public chain, and the exchange transaction includes the initial number of exchange passes and the type of exchange pass. For example, if the block chain network as the exchange chain is network A, one or more nodes (that is, exchange nodes) in network A need to use 100 certificates to exchange Ta to exchange certificates to Tc, then its node initiates a For exchange transactions, the exchange transaction includes the initial number of exchanges to be transferred to the public chain is 100 exchanges Ta, and the exchange exchange type is Tc. The exchange chain sends the exchange transaction containing the above information to the public chain. After receiving the exchange transaction, the public chain extracts the types of the initial certificate exchange and the exchange certificate pass, and queries the initial certificate exchange and the exchange certificate in the public chain network. According to the supply of two kinds of securities, the exchange ratio of the two kinds of securities is calculated based on the supply of the two kinds of securities. The calculation method of the exchange ratio is the same as the calculation method of the supply chain when initiating the supply transaction.

In practical applications, for the exchange chain, the initial stock exchange type during the exchange can be in many different forms. For example, for the exchange chain network A, the initial stock exchange type used for exchange can be in the network A Circulation Securities Link Ta can also be the public chain Securities Link Tp, or even the circulation of Tb, Te or Tf in other blockchains. Therefore, different methods can be used in the calculation of the exchange ratio. Further, as shown in FIG. 8, the steps of querying the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculating the exchange ratio of the exchange stock exchange and the initial stock exchange according to the supply volume include:

S151: determine whether the initial stock exchange is a public chain stock exchange;

S152: If the initial stock exchange is a public chain stock exchange, query the supply of exchange stocks in the public chain network;

S153: Calculate the exchange ratio between the exchange certificate and the public chain certificate according to the supply of the exchange certificate;

S154: If the initial stock exchange is not a public chain stock exchange, query the supply of the initial stock exchange and exchange stock exchange in the public chain network;

S155: Calculate the exchange ratio between the initial stock exchange and the public chain stock exchange based on the supply of the initial stock exchange;

S156: Calculate the exchange ratio between the exchange certificate and the public chain certificate according to the supply of the exchange certificate;

S157: Calculate the exchange ratio between the exchange pass and the initial pass.

In this embodiment, it is possible to judge the type of the initial pass through the exchange transaction initiated by the exchange chain, that is, to determine whether the initial pass is a public chain pass. If the initial stock exchange is a public chain stock exchange, that is, the exchange chain network A uses 100 public chain stock exchange Tp to exchange stock exchange Tc, then the public chain only needs to obtain the exchange stock supply, that is, the supply of stock exchange Tc. Then calculate the exchange ratio between the exchange certificate Tc and the public chain certificate Tp according to the supply of exchange certificates. If the initial stock exchange is not a public chain stock exchange, that is, the exchange chain network A uses 100 stock exchange Ta to exchange stock exchange Tc, then the public chain needs to query the supply of the initial stock exchange Ta and the exchange stock exchange Tc at the same time, and then calculate separately The exchange ratio between the initial stock exchange Ta and the public chain stock exchange Tp, as well as the exchange ratio between the exchange stock exchange Tc and the public chain stock exchange Tp, the final stock exchange stock Ta and the exchange are determined based on the exchange ratio calculated twice The exchange ratio between Tec Tc.

After calculating the exchange ratio between the initial stock exchange and the exchange stock exchange, the public chain transfers the exchange stock exchange and the value of the initial stock exchange to the exchange chain based on the number of transfer stock exchanges received. For example, if the exchange ratio between the initial stock exchange Ta and the exchange stock exchange Tc is 5:1, when the public chain receives 100 stock exchange Ta, it transfers 20 Tc to the exchange chain according to the exchange ratio. After the transfer, Store 100 STOs in the public chain, and then add 100 STO supplies in the public chain.

Further, as shown in FIG. 9, for the conversion ratio of the exchange certificate to the public chain certificate calculated by the receiving public chain based on the supply of the exchange certificate, the step of confirming whether the transaction is completed includes:

S321: initiate the exchange transaction through the parallel chain corresponding to the exchange chain;

S322: Control the parallel chain to generate a query transaction according to the exchange transaction, and initiate a query transaction to the public chain, so that the public chain returns the conversion ratio of the exchange certificate to the initial certificate to the parallel chain according to the query transaction;

S323: Control the parallel chain to calculate the number of available exchange passes based on the exchange ratio of the exchange pass and the initial pass, and send the number of exchange passes to the exchange chain;

S324: Receive the number of exchange certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate the exchange transaction to the public chain.

In this embodiment, it is similar to the form of supply transaction. After the exchange chain initiates the exchange transaction through the parallel chain, the parallel chain can generate a query transaction for the public chain according to the exchange transaction. Also in this embodiment, the query transaction may be a transaction of a prescribed form, such as a transaction in which the number of transaction passes is 0, or a transaction in a form specified by a smart contract, and the query transaction needs to carry exchange pass type information. After receiving the inquiry transaction, the public chain returns the exchange ratio of the exchange certificate exchange to the initial exchange certificate to the parallel chain according to the inquiry transaction. The parallel chain then passes the returned exchange ratio to the exchange chain, or calculates the number of exchangeable public chain certificates through the exchange transaction and the conversion ratio, and sends the available public chain certificates to the exchange chain (or exchange node) .

After receiving the number of public chain certificates issued by the parallel chain, the exchange chain can judge it to determine whether such exchange results can be accepted. If the exchange chain can accept the exchange result, the parallel chain can be controlled to send the exchange transaction to the public chain. If the exchange result is not accepted, the parallel chain can be controlled to withdraw the exchange transaction.

Similar to the supply transaction process initiated by the supply chain, in this application, when the exchange chain initiates a supply transaction to the public chain, the exchange node within the exchange chain will generate a block data that conforms to the exchange chain network transaction specifications based on the exchange transaction information, and will The formed block data is broadcast respectively in the exchange chain network and the public chain network, thereby forming a complete block chain in the exchange chain network. The nodes in the public chain re-verify the block data of the exchange transaction, and form or further convert into block data that conforms to the public chain transaction specifications, so that after broadcasting in the public chain network, a complete, public chain network-based Blockchain to complete bookkeeping operations.

It should be noted that the exchange chain Ta and the supply chain Tc described in the above embodiments are merely examples for ease of description. In actual applications, a blockchain network connected to a public chain network, such as a third-party public chain, The tripartite industry chain, alliance chain and private chain, as well as the sub-chain developed based on the public link specification, can be used as both the exchange chain and the supply chain. Moreover, since different blockchain networks have their own functions, multiple types of certificates can be provided for the same blockchain network. In addition, in the public chain to supply chain or exchange chain transfer exchange exchange and public chain exchange mentioned in this application, the exchange chain and supply chain may not need to directly receive the transfer certificate exchange, but through the public chain or blockchain The corresponding account on the network is used to complete the transfer, that is, between two incompatible two blockchain networks, the transfer can be completed through the account opened on the public chain to avoid the problem that the exchange chain cannot identify the exchange certificate.

In the technical solution provided by this application, for the supply chain, such as supply chain network C, the essence of the transaction process is to use Tec Tc and exchange for another Tec T, such as Ta, so for the supply chain, the supply is completed After the transaction, the obtained public chain certificate pass Tp can be directly used to exchange the certificate pass Ta, that is, the network C can then be used as the exchange chain to initiate the exchange transaction, by transferring 3000 public chain certificate pass Tp to the public chain, exchange the equivalent value of the certificate pass Ta.

It can be seen that in this application, as the supply chain blockchain network can be exchanged for the public chain certificate through the public chain, and then use the public chain certificate to exchange for the certificate to be exchanged, the entire process does not touch other blockchain networks at all, that is Complete the exchange of STO without opponents. Similarly, for the exchange chain, the exchange of securities through the public chain is also completed, and there is no need to contact the exchange opponent. Therefore, the entire conversion process can be completed by the decentralized application in the public chain network, and the transaction process simultaneously completes the accounting procedures in the public chain and the participating blockchain network, which can provide a relatively objective and fair exchange environment.

In the STO exchange method provided in this application, regardless of the supply transaction or the exchange transaction, the step of determining the exchange ratio between the two STOs can be calculated according to the STO supply provided in the above scheme. It is also possible to build a regularly updated exchange rate table in the public chain network. The exchange ratio table can provide a variety of exchange ratios between securities exchanges. This exchange ratio can be calculated and provided by some nodes in the public chain that are specifically used to balance the value of the securities exchange, or it can be provided by the financial industry chain connected to the public chain network. provide. However, for the financial industry chain connected to the public chain network, when accessing the public chain network, the maintenance nodes in the public chain and other blockchain networks related to the interest can vote on the financial industry chain to determine the The authority and effectiveness of the financial industry to provide a more reasonable exchange ratio. Obviously, in actual application, when determining the exchange ratio between the two types of securities, the public chain can also guarantee the maximum exchange between the two parties by providing the exchange efficiency according to the amount of supply and referring to the exchange ratio table. rights and interests.

Based on the above-mentioned exchange methods, this application also provides a public blockchain-based blockchain system. As shown in FIG. 10, the blockchain system includes: a public blockchain, and a supply chain and redemption connected to the public blockchain network Chain, public chain, supply chain and exchange chain are all peer-to-peer networks;

The public chain is configured to: receive supply transactions initiated by the supply chain; query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio of the supply chain through the supply chain of the supply chain; The exchange ratio of supply certificate to public chain certificate, transfer to the supply chain and the value of the supply chain to the public chain certificate;

The similar parts between the embodiments provided in this application can be referred to each other, and the specific embodiments provided above are just a few examples under the general concept of this application, and do not constitute a limitation of the protection scope of this application. For those skilled in the art, any other implementations extended based on the solution of the present application under the premise of not paying creative work fall within the protection scope of the present application.

Claims

A public-chain-based exchange method for stock exchanges, applied to public-chain networks, is characterized by:

Receiving a supply transaction initiated by the supply chain, the supply transaction including the type and number of supply certificates transferred to the public chain;

Query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio between the supply chain and the public chain stock chain based on the supply volume of the supply chain;

According to the exchange ratio of supply certificate and public chain certificate, transfer to the supply chain and the value of the supply chain of the same value of the public chain certificate;

Receive an exchange transaction initiated by the exchange chain, where the exchange transaction includes the initial number of exchanges and the type of exchange exchanges transferred to the public chain;

Query the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculate the exchange ratio of the exchange stock exchange and the initial stock exchange based on the supply volume;

According to the exchange ratio between the exchange pass and the initial pass, transfer the exchange pass with the value equal to the number of the initial pass to the exchange chain.
The exchange method according to claim 1, characterized in that the steps of querying the supply volume of the supply chain in the public chain network, and calculating the conversion ratio of the supply chain through the supply chain of the supply chain include:

Receive the pledge certificate pass of the supply chain transfer, the pledge certificate pass includes a predetermined number of supply certificate passes to the public chain and the public chain certificate passes to the public chain at the same time;

Calculate the initial exchange ratio based on the quantitative relationship between the supplied pledge certificates, the supply certificates and the public chain certificates;

The initial conversion ratio is stored, and based on the initial conversion ratio, the conversion ratio is adjusted in real time according to the number of subsequent supply pass transfers.
The exchange method according to claim 1, characterized in that before the step of receiving a supply transaction initiated by the supply chain, the method further comprises:

Verify the supply qualification of supply chain supply certificates connected to the public chain network through the number of public chain certificates issued by the supply chain;

If the number of public chain certificates passed by the supply chain is greater than or equal to the verification threshold, it is determined that the supply chain has supply qualifications and the supply transaction initiated by the supply chain is received;

If the number of public chain certificates issued by the supply chain is less than the verification threshold, determine that the supply chain does not have supply qualifications, send verification prompts to the supply chain, and store the types of supply certificates that the supply chain can provide.
The exchange method according to claim 1, characterized in that the steps of querying the supply volume of the initial stock exchange and the exchange stock exchange in the public chain network, and calculating the conversion ratio of the exchange stock exchange and the initial stock exchange based on the supply volume include:

Determine whether the initial stock exchange is a public chain stock exchange;

If the initial stock exchange is a public chain stock exchange, query the supply of exchange stocks in the public chain network;

Calculate the exchange ratio of exchange certificates to public chain certificates according to the supply of exchange certificates;

If the initial stock exchange is not a public chain stock exchange, query the supply of the initial stock exchange and exchange stock exchange in the public chain network;

Calculate the exchange ratio between the initial stock exchange and the public chain stock exchange according to the supply of the initial stock exchange;

Calculate the exchange ratio of exchange certificates to public chain certificates according to the supply of exchange certificates;

Calculate the exchange ratio between the exchange pass and the initial pass.
The exchange method according to claim 1, characterized in that before the step of receiving the supply transaction initiated by the supply chain, it is verified whether the supply chain is configured with a smart contract that complies with the public chain exchange rules, and if the supply chain is not configured with a smart contract, the The steps of the chain configuration smart contract include:

Determine whether the supply chain supports the configuration of smart contracts;

If the supply chain supports the configuration of smart contracts, configure smart contracts to the supply chain;

If the supply chain does not support the configuration of smart contracts, configure a parallel chain to the supply chain, which is a part of nodes in the public chain network;

Configure smart contracts for parallel chains so that the parallel chain initiates supply transactions to the public chain.
A public chain-based exchange method for stock exchanges, applied to supply chain networks, is characterized by:

Initiate a supply transaction to the public chain, the supply transaction includes the type of supply pass and the number of supply passes transferred to the public chain;

The receiving public chain calculates based on the supply volume of the supply pass, and the exchange ratio of the supply pass to the public link pass confirms whether the transaction is completed;

After confirming the completion of the transaction, the public chain transfer that has the same value as the number of supply certificate transfers received from the public chain transfer.
The exchange method according to claim 6, characterized in that the step of confirming whether the transaction is completed by the receiving public chain is calculated based on the supply quantity of the supply stock pass and the exchange ratio of the supply stock pass and the public chain stock pass includes:

Initiate supply transactions to the parallel chain corresponding to the supply chain;

Control the parallel chain to generate a query transaction based on the supply transaction and initiate a query transaction to the public chain, so that the public chain returns the exchange ratio between the supply certificate and the public chain certificate to the parallel chain according to the query transaction;

Control the parallel chain to calculate the number of available public chain certificates and send the number of public chain certificates to the supply chain based on the exchange ratio between supply certificates and public chain certificates.

Receive the number of public chain certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate supply transactions to the public chain.
A public-chain-based exchange method for stock exchanges, applied to the exchange chain network, is characterized by including:

Initiate an exchange transaction to the public chain. The exchange transaction includes the initial number of exchanges and the type of exchange exchanges transferred to the public chain;

The receiving public chain calculates based on the supply of the initial stock exchange and the exchange stock exchange, the conversion ratio of the exchange stock exchange and the public chain stock exchange, and confirms whether the transaction is completed;

After confirming the completion of the transaction, if the transfer from the public chain is received, the exchange certificate of the same value as the number of public chain certificates will be received.
The exchange method according to claim 8, characterized in that the step of confirming whether the transaction is completed by the receiving public chain is calculated based on the supply of the exchange certificate, the conversion ratio of the exchange certificate and the public chain certificate, including:

Initiate the exchange transaction through the parallel chain corresponding to the exchange chain;

Control the parallel chain to generate a query transaction based on the exchange transaction, and initiate a query transaction to the public chain, so that the public chain returns the conversion ratio of the exchange certificate to the initial certificate to the parallel chain according to the query transaction;

Control the parallel chain to calculate the number of available exchange passes based on the exchange ratio of the exchange pass and the initial pass, and send the number of exchange passes to the exchange chain;

Receive the number of exchange certificates, determine whether to complete the transaction, and after determining to complete the transaction, control the parallel chain to initiate the exchange transaction to the public chain.
A blockchain system based on a public chain is characterized by including: a public chain, and a supply chain and an exchange chain connected to the public chain network. The public chain, the supply chain, and the exchange chain are all peer-to-peer networks;

Wherein, the supply chain is configured to: initiate a supply transaction to the public chain, and the supply transaction includes the type and number of supply certificates that are transferred to the public chain; and, the public chain certificate that receives transfers from the public chain;

The exchange chain is configured to initiate an exchange transaction to the public chain, and the exchange transaction includes the initial number of exchanges and types of exchanges to be transferred to the public chain; and, the exchange exchange to receive transfers from the public chain;

The public chain is configured to: receive supply transactions initiated by the supply chain; query the supply volume of the supply chain in the public chain network, and calculate the exchange ratio of the supply chain through the supply chain of the supply chain; The exchange ratio of supply certificate to public chain certificate, transfer to the supply chain and the value of the supply chain to the public chain certificate;

And, receive the exchange transaction initiated by the exchange chain; query the supply of the exchange certificate and the initial certificate in the public chain network, and calculate the exchange certificate and the initial certificate according to the supply of the exchange certificate and the initial certificate Exchange ratio; according to the exchange ratio between the exchange pass and the initial pass, transfer the exchange pass to the exchange chain and the number of the initial pass is equal to the exchange pass.