WO2020042936A1

WO2020042936A1 - Parallel chain-based cross-chain transaction method and apparatus, and block chain system

Info

Publication number: WO2020042936A1
Application number: PCT/CN2019/101057
Authority: WO
Inventors: 白杰; 吴先锋; 李冬云
Original assignee: 白杰
Priority date: 2018-08-28
Filing date: 2019-08-16
Publication date: 2020-03-05

Abstract

A parallel chain-based cross-chain transaction method and apparatus, and a block chain system. Said method comprises: determining a cross-chain transaction to be completed between a transaction initiation chain and a transaction target chain; instructing, according to said cross-chain transaction, the transaction target chain to pay for transaction content required by the transaction initiation chain in the cross-chain transaction; and upon detecting that the transaction target chain has completed the payment, instructing the transaction initiation chain to pay for transaction content required by the transaction target chain in said cross-chain transaction. In the present application, a parallel chain instructs a transaction initiation chain and a transaction target chain to pay for transaction content required thereby, thereby completing a cross-chain transaction. As a parallel chain node is a common node of the transaction initiation chain and the transaction target chain, the parallel chain can participate in both a transaction of the transaction initiation chain and a transaction of the transaction target chain. Using this characteristic, the parallel chain can perform coordination and control during a transaction, and connect the transaction initiation chain and the transaction target chain, realizing a cross-chain transaction between different chains, so that block chain transactions are no longer limited within a single block chain network.

Description

Method, device and blockchain system for cross-chain transactions based on parallel chains

This application requires the submission of the China Patent Office on August 28, 2018, application number 201810986825.3, the invention name as "Blockchain Standard Application Model and Application Method", and the submission of the China Patent Office on December 7, 2018, application number The priority of the Chinese patent application is 201811496870.7 and the invention name is "A Parallel Chain-based Cross-chain Transaction Method, Device and Blockchain System", the entire contents of which are incorporated herein by reference.

Technical field

This application relates to the field of blockchain technology, and in particular, to a cross-chain-based cross-chain transaction method, device, and blockchain system.

Background technique

Blockchain provides a decentralized system idea. The most fundamental principle of this idea is to create a relatively objective anti-repudiation digital environment through public consensus. Blockchain technology can make network information immutable once it is released. For example, a transaction occurs in the blockchain network. Nodes in the blockchain network will record the transaction in the generated block, and then add the block. Go to the blockchain and broadcast it throughout the network to form an unchangeable blockchain. Therefore, the blockchain is essentially a distributed public ledger. This public ledger consists of multiple data blocks and is jointly maintained by each node. The nodes that maintain the same blockchain form a physical chain, such as public, private, and alliance chains. These nodes together form a peer-to-peer blockchain network.

Among them, the above-mentioned transactions not only refer to transactions in the traditional sense, such as the purchase and sale of goods and the exchange of goods, but also the results of data operations or data exchange. For example, node A in a public chain initiates a transaction request, and the transaction content of the transaction request is to pay 10 tokens for node A to query the weather. Node B in the public chain provides weather query services. Then, node A pays 10 securities exchanges to the account corresponding to node B, and node B sends the weather conditions inquired to node A, and then node A and node B jointly complete the transaction request initiated by node A. Among them, the payment of 10 Zentong and sending weather conditions can be recorded as the transaction information of the transaction in the blockchain of the public chain.

With the continuous development of blockchain technology, more and more blockchain networks targeted at different fields have appeared. There are differences between different blockchain networks, such as different consensus mechanisms, and the lack of a unified and effective mechanism to communicate with each other. Because cross-chain transactions cannot be conducted between different blockchain networks, blockchain-based transactions are limited to a single blockchain network.

Summary of the Invention

This application provides a cross-chain-based cross-chain transaction method, device, and blockchain system, which can be used to solve the problem that cross-chain transactions cannot be performed between different blockchain networks in the prior art, resulting in blockchain-based transactions being blocked. Problems confined to a single blockchain network.

In a first aspect, the present application provides a cross-chain-based cross-chain transaction method, which includes:

Determine the pending cross-chain transactions between the transaction initiation chain and the transaction target chain;

Instructing the transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to the cross-chain transaction;

When it is detected that the transaction target chain has completed the payment, the transaction initiation chain is instructed to pay the transaction content required by the transaction target chain in the cross-chain transaction.

Optionally, the transaction content that instructs the transaction target chain to pay for the transaction initiation chain requirement in the cross-chain transaction includes:

Calling the execution of the smart contract of the transaction target chain to generate a first transaction instruction, where the first transaction instruction is used to notify the transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction;

Sending the first transaction instruction to the transaction target chain, so that the transaction target chain verifies the first transaction instruction and pays transaction content required by the transaction initiation chain.

Optionally, the transaction content that instructs the transaction initiation chain to pay for the transaction target chain demand in the cross-chain transaction includes:

Calling the execution of the smart contract of the transaction initiation chain to generate a second transaction instruction, where the second transaction instruction is used to notify the transaction initiation chain to pay the transaction content required by the transaction target chain in the cross-chain transaction;

Sending the second transaction instruction to the transaction target chain, so that the transaction initiation chain verifies the second transaction instruction and pays transaction content required by the transaction target chain.

Optionally, the determining a cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain includes:

Obtaining a cross-chain transaction initiated by the transaction initiation chain;

Detecting whether the cross-chain transaction is recorded in a parallel chain blockchain;

If it is detected that the cross-chain blockchain does not record the cross-chain transaction, it is determined that the cross-chain transaction is a pending cross-chain transaction.

Optionally, the method further includes:

Obtaining a blockchain of the transaction initiation chain or the transaction target chain;

Update the parallel chain blockchain according to the blockchain of the transaction initiation chain or the transaction target chain.

Optionally, the updating the parachain blockchain includes:

Generating summary information according to the blockchain of the transaction initiation chain or the transaction target chain, where the summary information is used to indicate a transaction recorded in the blockchain of the transaction initiation chain or the transaction target chain;

Generate a block including the summary information, and add the block to the parachain blockchain.

In a second aspect, the present application provides a parachain-based blockchain cross-chain transaction device, which is deployed in a parachain node and includes:

A transaction determination module, for determining a cross-chain transaction to be completed between a transaction initiation chain and a transaction target chain;

A transaction instruction module, configured to instruct a transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to the cross-chain transaction; and when the transaction target chain is detected to complete the payment, instruct the transaction to initiate The transaction content required by the transaction target chain in the cross-chain transaction.

In a third aspect, the present application provides a blockchain system based on a parallel chain. The blockchain system includes a transaction initiation chain, a parallel chain, and a transaction target chain. The common node composition of the transaction target chain is described;

The parallel chain is used to determine a cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain; and according to the cross-chain transaction, instruct the transaction target chain to pay for the transaction initiation in the cross-chain transaction Transaction content required by the chain; when it is detected that the transaction target chain completes payment, instruct the transaction initiation chain to pay the transaction content required by the transaction target chain in the cross-chain transaction;

The transaction target chain is configured to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to an instruction of the parallel chain;

The transaction initiation chain is configured to pay for transaction content required by the transaction target chain in the cross-chain transaction according to an instruction of the parallel chain.

In the solution provided by this application, the parallel chain instructs the transaction initiation chain and the transaction target chain to pay the transaction contents that need to be paid according to the cross-chain transaction, thereby completing the cross-chain transaction. Because the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain can participate in both the transaction of the transaction initiation chain and the transaction of the transaction target chain. Parachain uses this feature to centrally regulate and connect the transaction initiation chain and the transaction target chain during the transaction process, overcoming the differences between the two parties, achieving cross-chain transactions between different chains, and making blockchain transactions no longer Limited to a single blockchain network.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions in the embodiments of the present application more clearly, the drawings used in the description of the embodiments are briefly introduced below. Obviously, the drawings in the following description are just some embodiments of the application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without paying creative labor.

1 is a schematic diagram showing a network architecture between a transaction initiation chain, a transaction target chain, and a parallel chain;

Fig. 2 is a schematic flowchart of a cross-chain-based cross-chain transaction according to an exemplary embodiment;

Fig. 3 is a flow chart showing a parachain determining a cross-chain transaction to be completed according to an exemplary embodiment;

Fig. 4 is a schematic flowchart of a parallel chain instruction transaction target chain payment transaction content according to an exemplary embodiment;

Fig. 5 is a schematic flow chart showing the contents of a parallel chain instruction transaction initiation chain payment transaction according to an exemplary embodiment;

Fig. 6 is a block diagram showing a parachain-based cross-chain transaction device according to an exemplary embodiment.

detailed description

The embodiments will be described in detail below, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following examples do not represent all implementations consistent with this application. These are merely examples of systems and methods consistent with some aspects of the application as detailed in the claims.

In the technical solution provided in this application, the blockchain network refers to a point-to-point network formed by blockchain nodes. The blockchain network can perform distributed storage, public consensus, digital encryption, transaction accounting, and verification. The data information in the blockchain or blockchain block is the transaction information of the nodes of the blockchain according to the transaction records when a transaction occurs in the blockchain network. Among them, one block includes transaction information of multiple transactions, and multiple blocks form a block chain. Each node in the blockchain network can be a physical node, such as a terminal, a server, or a virtual node. Nodes in the same blockchain network communicate and maintain the operation of the blockchain network based on the same consensus mechanism.

In this application, the transaction initiation chain, transaction target chain, and parachain refer to different blockchain networks that conform to the blockchain technology. The transaction initiation chain refers to the blockchain network that initiated the cross-chain transaction, and the transaction target chain is the blockchain network where the transaction object of the cross-chain transaction is located. The transaction initiation chain and the transaction target chain are independent blockchain networks, such as Bitcoin and Ethereum, or industry and alliance chains developed by different industries, or even different private or public chains. Due to the differences between these independent blockchain networks, such as different consensus mechanisms, they cannot communicate or trade with each other. Therefore, in the technical solution provided in this application, the transaction initiation chain and the transaction target chain are connected by a parallel chain.

In this application, the parachain is composed of the common nodes of the transaction initiation chain and the transaction target chain. Because the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain has both the function of the transaction initiation chain and the transaction target chain, and stores both parties' blockchains. Therefore, the parallel chain can transform the information in the blockchain network on one side and then transfer it to the blockchain network on the other side. Through the bridging effect in the parallel chain, communication or transaction can be performed between the transaction initiation chain and the transaction target chain.

For example, as shown in FIG. 1, it shows a schematic diagram of a network architecture between a transaction initiation chain, a transaction target chain, and a parallel chain. As a common node of the transaction initiation chain 11 and the transaction target chain 12, the parallel chain node 101 can both communicate with the transaction initiation chain node 111 and communicate with the transaction target chain node 121.

Referring to FIG. 2, a schematic flowchart of a cross-chain-based cross-chain transaction method according to the present application is exemplarily shown. The method includes the following steps.

S20: Determine a cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain.

In the solution provided in this application, cross-chain transactions between the transaction initiation chain and the transaction target chain need to be completed through a parallel chain. Therefore, the parallel chain determines the cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain. A pending cross-chain transaction refers to a cross-chain transaction that has been sent to a parallel chain but has not yet been completed. It includes transaction-related information, such as the address information of the two parties to the transaction, the transaction conditions, and the transaction content that both parties need to pay. A transaction refers to the transaction content of both parties in accordance with the transaction conditions. Therefore, a cross-chain transaction actually includes two sub-transactions. A sub-transaction is the transaction content of the transaction initiation chain and the transaction target chain to pay for the transaction target chain. Another sub-transaction is the transaction content that the transaction target chain pays to the transaction initiation chain. Therefore, to complete a cross-chain transaction, two sub-transactions in the cross-chain transaction need to be completed.

Exemplarily, the cross-chain transaction between the transaction initiation chain A and the transaction target chain B is: 50 transactions initiating the Zhengtong a of the chain A, in exchange for 5 transactions in the trading target chain B. Then, the two sub-transactions actually included in this cross-chain transaction are: the transaction initiation chain pays 50 STOs A to the transaction target chain, and the transaction target chain pays 5 STOs b to the transaction initiation chain.

Further, as shown in FIG. 3, in the above step S20, the parallel chain determines the cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain, including the following sub-steps.

S201. Obtain a cross-chain transaction initiated by a transaction initiation chain.

S202: Detect whether cross-chain transactions are recorded in a parallel chain blockchain.

S203: If it is detected that the cross-chain blockchain does not record cross-chain transactions, it is determined that the cross-chain transactions are pending cross-chain transactions.

To determine the cross-chain transaction to be completed, the parallel chain needs to obtain the cross-chain transaction first. In the blockchain network, the nodes that initiate transactions are called transaction nodes. The transaction nodes in the transaction initiation chain initiate a cross-chain transaction and broadcast the cross-chain transaction in the transaction initiation chain. Correspondingly, when the parachain node receives the cross-chain transaction, the parachain obtains the cross-chain transaction initiated by the transaction initiation chain.

In the embodiment of the present application, since the cross-chain transaction initiated by the transaction initiation chain actually includes two sub-transactions, a parallel chain is required to instruct the transaction initiation chain and the transaction target chain to complete the two sub-transactions. Therefore, there are two types of cross-chain transactions initiated by the transaction initiation chain.

First, the transaction initiation chain initiates a transaction request to initiate a cross-chain transaction. The transaction request only includes information related to cross-chain transactions, such as transaction conditions, address information of both parties to the transaction, and so on. The transaction node sends the transaction request to the parachain. Accordingly, the parallel chain determines the corresponding cross-chain transaction according to the information in the transaction request.

Second, the transaction initiation chain initiates a trigger transaction to initiate a cross-chain transaction. This trigger transaction is a special transaction. The transaction form is the same as the ordinary transaction form in the transaction initiation chain, but it requires a specific agreement on the specific transaction method, such as a transaction with an agreed number of STOs to be transferred. The transaction initiation chain initiates the trigger transaction, and the transaction object is a cross-chain transaction smart contract. The node that completes the triggered transaction generates a transaction result by triggering a cross-chain transaction smart contract. The transaction results include information related to cross-chain transactions. The transaction initiation chain node generates a block containing the result of the transaction, adds it to the blockchain, and broadcasts it. Correspondingly, after the parallel chain obtains the transaction results in the block, it determines the cross-chain transaction initiated by the transaction initiation chain.

Exemplarily, the transaction initiation chain initiates a trigger transaction, and the trigger transaction is to pay 1 Zhengtong to the cross-chain transaction smart contract; and the trigger transaction includes information related to the cross-chain transaction. The node that completes the triggered transaction executes a cross-chain transaction smart contract, generates a block containing the transaction result, adds it to the blockchain, and broadcasts it. Correspondingly, due to the triggered transaction completed by this node, one token pass paid to the cross-chain transaction smart contract in the triggered transaction is obtained as a reward token pass.

The blockchains stored in the parallel chain include the blockchain of the transaction initiation chain and the transaction target chain. The transaction initiation chain and the transaction target chain have their respective completed transactions recorded. Therefore, the parachain can detect whether the cross-chain transaction is recorded in the parachain blockchain to determine whether the cross-chain transaction is completed; if the cross-chain transaction is recorded in the parachain blockchain, it is determined that the cross-chain transaction has been completed; if Cross-chain transactions are not recorded in the parachain blockchain, and it is determined that the cross-chain transaction is to be completed. Among them, cross-chain transactions are recorded in the parallel chain blockchain, which means that two sub-transactions in the cross-chain transaction have been recorded in the parallel chain blockchain.

Exemplarily, the cross-chain transaction between the transaction initiation chain A and the transaction target chain B is: 50 transactions initiating the Zhengtong a of the chain A, in exchange for 5 transactions in the trading target chain B. Then, in the parachain blockchain, parachain detects whether the transaction initiation chain A has paid 50 tokens a to the transaction target chain B, and whether the transaction target chain B has paid 5 tokens b to the transaction initiation chain A. .

In another embodiment, the parallel chain may determine a cross-chain transaction to be completed by calling a query smart contract. Because cross-chain transactions include two sub-transactions, the parallel chain can query the two smart transactions through the transaction initiation chain and the transaction target chain respectively. For the sub-transactions that need to be completed in the transaction initiation chain, the parallel chain calls the query smart contract in the transaction initiation chain to check whether the sub-transaction is completed; for the sub-transactions that the transaction target chain needs to complete, the parallel chain calls the query smart contract in the transaction target chain Query whether the sub-transaction is completed.

In a possible implementation manner, before a transaction node initiates a cross-chain transaction, it first initiates a query transaction. The query transaction includes the transaction content required by the transaction initiation chain and the transaction content that the transaction initiation chain can pay. According to the query transaction, the parallel chain determines whether the transaction target chain can reach a transaction with the transaction initiation chain. If there is a target node in the transaction target chain that can reach a transaction with the transaction node, the parallel chain sends the relevant information of the target node to the transaction node, such as the address information and transaction conditions of the target node. The transaction node initiates cross-chain transactions according to the relevant information of the target node.

Exemplarily, the transaction node A1 hopes to initiate Zentong a of chain A with 50 transactions in exchange for Zentong b of 5 transaction target chains B. Therefore, transaction node A1 initiates a query transaction. Parallel chain determines the transaction according to the query transaction. Node A1 needs 5 STOs A and can pay 50 STOs b. According to the content of the query transaction, the parallel chain queries whether the transaction target chain B has a target node B1 that can reach a transaction with the transaction node A1. One node in the transaction target chain B requires 50 STOs A and is willing to pay up to 7 STOs b. Then, the parallel chain uses the node as a target node, and sends related information of the target node to the transaction node A1. The transaction node A1 initiates a cross-chain transaction according to the relevant information of the target node B1.

In another possible implementation manner, the transaction node directly initiates a cross-chain transaction. Cross-chain transactions also include the transaction content required by the transaction initiation chain and the transaction content that the transaction initiation chain can pay, but it does not specify the target node that is the most transaction target. According to the cross-chain transaction, the parallel chain determines whether the transaction target chain can reach a transaction with the transaction initiation chain. If there is a target node in the transaction target chain that can reach a transaction with the transaction node, the parallel chain directly performs the subsequent cross-chain transaction steps; if there is no target node in the transaction target chain that can reach a transaction with the transaction node, the parallel chain notifies the transaction node transaction failed.

S21, indicating the transaction content of the transaction initiation chain demand in the transaction target chain payment cross-chain transaction.

After the parallel chain determines the pending cross-chain transaction, according to the pending cross-chain transaction, the transaction target chain is first instructed to pay for the transaction content of the transaction initiation chain demand in the cross-chain transaction. Specifically, since the parachain node is also a node in the transaction target chain, the parachain has the full function of the transaction target chain, and can directly call the execution of the smart contract of the transaction target chain to instruct the transaction target chain to pay for transaction initiation in the cross-chain transaction The transaction content of the chain demand. The parallel chain invokes the execution of the smart contract of the transaction target chain, and the maintainer node in the transaction target chain completes the corresponding sub-transactions, that is, the transaction content required by the transaction initiation chain in the payment of cross-chain transactions. Among them, the maintainer node is the node responsible for maintaining the blockchain in the blockchain network and has the right to keep accounts. After the maintainer node in the transaction target chain completes the corresponding sub-transaction, it will record the sub-transaction in the generated block. The transaction target chain is synchronized with the parallel chain block, that is, the parallel chain synchronizes the block chain of the transaction target chain.

Further, as shown in FIG. 4, in the above step S21, the parallel chain instructs the transaction target chain to pay the transaction content of the transaction initiation chain demand in the cross-chain transaction, including the following sub-steps.

S211. The parallel chain invokes the execution of the smart contract of the transaction target chain to generate a first transaction instruction.

S212. The parallel chain sends the first transaction instruction to the transaction target chain.

S213: The transaction content of the transaction initiation chain demand in the transaction target chain payment cross-chain transaction.

The parachain calls the execution of the smart contract of the transaction target chain to generate a first transaction instruction. Since the first transaction instruction is used to notify the transaction target chain of the transaction content of the transaction initiation chain demand in the cross-chain transaction, the first transaction instruction includes payment-related information, such as address information and specific transaction content to be paid. The parallel chain sends the first transaction instruction to the transaction target chain, that is, the first transaction instruction is broadcast in the transaction target chain. When the maintainer node in the transaction initiation chain receives the first transaction instruction, it verifies the first transaction instruction, pays for the transaction content required by the transaction initiation chain in the cross-chain transaction, and records it in the generated block. The block generated by the transaction initiation chain broadcasts a consensus among the nodes in the transaction initiation chain and confirms that the payment is complete.

In the technical solution provided in this application, cross-chain transactions generally include two types: exchange of information exchange and information services. Among them, the STO exchange refers to the use of the STO of the transaction initiation chain to exchange the STO of the transaction target chain; the information service means that the transaction initiation chain pays a certain amount of STO to the transaction target chain, and the purchase of the transaction target chain sends the corresponding Or the transaction initiation chain sends the information data to the transaction target chain in exchange for a certain amount of securities. However, whether it is a stock exchange or an information service, it is a data operation or the result of a data operation. For example, when the transaction initiation chain pays a certain number of transactions in the transaction initiation chain to the transaction target chain, the maintainer node actually transfers a certain number of securities in the transaction to the account corresponding to the target node. Because the payment is made through the transaction initiation chain, the transfer operation is completed in the transaction initiation chain and does not involve cross-chain operations between the transaction initiation chain and the transaction target chain. Therefore, after the maintainer node determines the address information and transaction conditions of the respective accounts of the transaction node and the target node, it can complete the payment of the transaction content between the transaction node and the target node.

Exemplarily, the cross-chain transaction is an information service, and the transaction initiation chain A pays 50 transaction initiation chains A of the transaction initiation chain A to the transaction target chain B to purchase weather information provided by the transaction target chain B. In the parallel chain, the transaction content paid by the transaction target chain B is specific weather information. The maintainer node B2 in the transaction target chain B sends specific weather information to the account corresponding to the transaction node A1 in the transaction initiation chain A according to the address information of the transaction node A1.

It should be noted that in the cross-chain transactions to be completed, there may be cases where the transaction target chain has already paid the corresponding transaction content, and the transaction initiation chain has not paid. For such a cross-chain transaction to be completed, the parallel chain no longer executes step S21, but directly executes step S22.

S22. When it is detected that the transaction target chain completes payment, instruct the transaction initiation chain to pay for the transaction content required by the transaction target chain in the cross-chain transaction.

After the parallel chain instructs the transaction target chain to pay for the transaction content required by the transaction initiation chain, it is necessary to check whether the transaction target chain has completed the payment. Only when the transaction target chain completes the payment, the parallel chain can indicate the transaction content required by the transaction target chain in the transaction initiation chain payment cross-chain transaction. Because the maintainer node in the transaction target chain will record the paid transaction content in the generated block and broadcast the blockchain in the transaction target chain, the parallel chain can be based on the synchronized transaction target chain area in the parallel chain blockchain Block chain, to check whether the transaction target chain has completed the payment.

In another embodiment of the present application, the parallel chain may detect whether the transaction target chain has completed the payment by invoking the transaction target chain to query the smart contract. Because the method of detecting whether the transaction target chain has completed the payment according to the parallel chain blockchain, the parallel chain needs to synchronize the blockchain of the transaction target chain first. When the transaction target chain has paid for the transaction content, but the parallel chain has not synchronized the transaction target chain's blockchain, the parallel chain cannot know that the transaction target chain has completed the payment. However, the parallel chain can be queried by calling the query smart contract, which can more quickly determine that the transaction target chain has completed payment, and improve the efficiency of cross-chain transactions.

Similar to the way that the parallel chain indicates the transaction target chain to pay for the transaction content, since the parallel chain node is also a node in the transaction initiation chain, therefore, the parallel chain has the full function of the transaction initiation chain, and can directly call the transaction initiation chain to execute the smart contract. Indicate the transaction content of the transaction initiation chain payment in the transaction initiation chain payment cross-chain transaction. Specifically, the parallel chain invokes the execution of the smart contract of the transaction initiation chain, and the maintainer node in the transaction initiation chain completes the corresponding sub-transaction, that is, the transaction content required to pay the transaction target chain. The maintainer node in the transaction initiation chain will record in the generated block after completing the corresponding sub-transaction. The transaction initiation chain is synchronized with the parallel chain block, that is, the parallel chain synchronizes the transaction initiation chain block chain.

After the transaction initiation chain completes the payment, the parallel chain can determine whether the transaction initiation chain has completed the payment by detecting the parallel chain blockchain or invoking the smart contract of the transaction initiation chain to query the completion of cross-chain transactions.

Further, as shown in FIG. 5, in the above step S22, the parallel chain instructs the transaction content of the transaction target chain demand in the transaction initiation chain payment cross-chain transaction, including the following sub-steps.

S221. The parallel chain invokes the execution of the smart contract of the transaction initiation chain to generate a second transaction instruction.

S222. The parallel chain sends the second transaction instruction to the transaction initiation chain.

S223: The transaction content of the transaction target chain demand in the transaction initiation chain payment cross-chain transaction.

The parallel chain invokes the execution of the smart contract of the transaction initiation chain to generate a second transaction instruction. Because the second transaction instruction is used to notify the transaction content of the transaction initiation chain payment transaction target chain requirement, the second transaction instruction includes payment-related transaction information, such as address information, and specific transaction content that needs to be paid. The parallel chain sends the second transaction instruction to the transaction target chain, that is, the second transaction instruction is broadcast in the transaction target chain. When the maintainer node in the transaction initiation chain receives the second transaction instruction, it verifies the second transaction instruction, pays for the transaction content required by the transaction initiation chain, and records the transaction in the generated block. The transaction target chain broadcasts the generated block, and a consensus is reached among the nodes of the transaction target chain to confirm that the payment is completed.

Exemplarily, the cross-chain transaction is an information service, and the transaction initiation chain A pays 50 transaction initiation chains A of the transaction initiation chain A to the transaction target chain B to purchase weather information provided by the transaction target chain B. In the parallel chain, the transaction content of the transaction initiation chain A payment is 50 Zhengtong a. The maintainer node in the transaction initiation chain A, according to the address information in the second transaction instruction, pays 50 tokens a to the target node B1 in the transaction target chain B.

In a possible implementation manner, the transaction target chain locks the transaction content when the transaction content required by the transaction initiation chain is paid. After the parallel chain determines that the transaction initiation chain has completed the payment, it sends the information that the transaction initiation chain has completed the payment to the transaction target chain. After determining that the transaction initiation chain has paid for the transaction content required by the transaction target chain, the transaction target chain unlocks the transaction content of its own payment. By locking the transaction content, it prevents the transaction initiation chain from paying the corresponding transaction content, which causes losses to the transaction initiation chain and achieves the effect of anti-repudiation.

In the embodiment of the present application, the parallel chain instructs the transaction initiation chain and the transaction target chain to pay the transaction contents that need to be paid according to the cross-chain transaction, thereby completing the cross-chain transaction. Because the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain can participate in both the transaction of the transaction initiation chain and the transaction of the transaction target chain. Parachain uses this feature to centrally regulate and connect the transaction initiation chain and the transaction target chain during the transaction process, overcoming the differences between the two parties, achieving cross-chain transactions between different chains, and making blockchain transactions no longer Limited to a single blockchain network.

In the technical solution provided in this application, in the process of cross-chain transactions, the parallel chain will synchronize the blockchain of the transaction initiation chain and the transaction target chain to update the parallel chain blockchain. Since the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain can directly obtain the blockchain of the transaction initiation chain or the transaction target chain and update the parachain blockchain. Specifically, in the technical solution provided in this application, there are two update modes of the parallel chain blockchain.

In a possible implementation manner, for a blockchain network connected through a parallel chain, the parallel chain uses the same consensus mechanism as the blockchain network to synchronize and update the parallel chain blockchain. As a node in the blockchain network, parachain nodes synchronize the blockchain in the same way as other nodes. The parallel chain blockchain is the same as the blockchain of the blockchain network.

In another possible implementation manner, for a blockchain network connected through a parachain, only the summary information of transactions in the blockchain network is recorded in the parachain blockchain. Specifically, after acquiring the blockchain of the transaction initiation chain or the transaction target chain, the parallel chain generates summary information according to the blockchain of the transaction initiation chain or the transaction target chain. The summary information is used to indicate transactions recorded in the blockchain of the corresponding blockchain network. Parachain generates blocks that include summary information, and adds the block to the parachain blockchain to achieve the update of the parachain blockchain. By recording the summary information, the amount of data to be stored in the parallel chain is reduced, and the storage space on the parallel chain is reduced.

The following are device embodiments of the present application and can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

Fig. 6 is a block diagram of a parachain-based cross-chain transaction device according to an exemplary embodiment. The device can be deployed at a parachain node and has a function for implementing the above method example, and the function can be implemented by hardware, or can be implemented by hardware executing corresponding software. The apparatus may include a transaction determination module 601 and a transaction instruction module 602.

The transaction determination module 601 is configured to determine a cross-chain transaction to be completed between a transaction initiation chain and a transaction target chain.

The transaction instruction module 602 is configured to instruct the transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to the cross-chain transaction; and when the transaction target chain is detected to complete the payment, instruct the transaction. The initiation chain pays for the transaction content required by the transaction target chain in the cross-chain transaction.

In the device provided in the embodiment of the present application, the parallel chain instructs the transaction initiation chain and the transaction target chain to pay the transaction contents that need to be paid according to the cross-chain transaction, thereby completing the cross-chain transaction. Because the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain can participate in both the transaction of the transaction initiation chain and the transaction of the transaction target chain. Parachain uses this feature to centrally regulate and connect the transaction initiation chain and the transaction target chain during the transaction process, overcoming the differences between the two parties, achieving cross-chain transactions between different chains, and making blockchain transactions no longer Limited to a single blockchain network.

Optionally, the transaction instruction module 602 is specifically configured to: call the execution of the smart contract of the transaction target chain to generate a first transaction instruction, and the first transaction instruction is used to notify the transaction target chain to pay the cross-chain transaction The transaction content required by the transaction initiation chain; sending the first transaction instruction to the transaction target chain, so that the transaction target chain verifies the first transaction instruction and pays for the transaction required by the transaction initiation chain content.

Optionally, the transaction instruction module 602 is specifically configured to: call the execution of the smart contract of the transaction initiation chain to generate a second transaction instruction, and the second transaction instruction is used to notify the transaction initiation chain to pay the cross-chain transaction The transaction content required by the transaction target chain; sending the second transaction instruction to the transaction target chain, so that the transaction initiation chain verifies the second transaction instruction and pays for the transaction required by the transaction target chain content.

Optionally, the transaction determination module 601 is specifically configured to: obtain cross-chain transactions initiated by the transaction initiation chain; detect whether the cross-chain transactions are recorded in a parallel chain blockchain; and when detecting the parallel chain blockchain When the cross-chain transaction is not recorded, it is determined that the cross-chain transaction is a pending cross-chain transaction.

Optionally, the apparatus further includes: a block update module.

The block update module is configured to obtain the block chain of the transaction initiation chain or the transaction target chain; and update the parallel chain block chain according to the block chain of the transaction initiation chain or the transaction target chain.

Optionally, the block update module is specifically configured to generate summary information according to the block chain of the transaction initiation chain or the transaction target chain, and the summary information is used to instruct the transaction initiation chain or Generate a block including the summary information, and add the block to the parachain blockchain.

Based on the above transaction method, this application also provides a parallel chain-based blockchain system. The system includes a transaction initiation chain, a parallel chain, and a transaction target chain. The parallel chain is composed of the transaction initiation chain and the transaction chain. Composition of common nodes of the transaction target chain;

In the blockchain system provided in this application, the transaction initiation chain and the transaction target chain are connected through a parallel chain, and the transaction content that needs to be paid is paid according to the instructions of the parallel chain to complete the cross-chain transaction. Because the parachain node is a common node of the transaction initiation chain and the transaction target chain, the parachain can participate in both the transaction of the transaction initiation chain and the transaction of the transaction target chain. Parachain uses this feature to centrally regulate and connect the transaction initiation chain and the transaction target chain during the transaction process, overcoming the differences between the two parties, achieving cross-chain transactions between different chains, and making blockchain transactions no longer Limited to a single blockchain network.

Those skilled in the art can clearly understand that the technology in the embodiment of the present invention can be implemented by means of software plus a necessary universal hardware platform. Based on such an understanding, the technical solutions in the embodiments of the present invention can be embodied in the form of software products that are essentially or contribute to the existing technology. The computer software product can be stored in a storage medium, such as ROM / RAM. , Magnetic disks, optical disks, etc., including a number of instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention or certain parts of the embodiments.

The same or similar parts among the various embodiments in this specification may refer to each other. Furthermore, in the description of this application, unless stated otherwise, "plurality" means two or more. In addition, in order to facilitate a clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as “first” and “second” are used to distinguish between the same or similar items having substantially the same functions and functions. Those skilled in the art can understand that the words "first", "second" and the like do not limit the number and execution order, and the words "first" and "second" are not necessarily different.

The embodiments of the present application described above do not constitute a limitation on the protection scope of the present application.

Claims

A cross-chain-based cross-chain transaction method, characterized in that the method includes:

Determine the pending cross-chain transactions between the transaction initiation chain and the transaction target chain;

Instructing the transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to the cross-chain transaction;

When it is detected that the transaction target chain has completed the payment, the transaction initiation chain is instructed to pay the transaction content required by the transaction target chain in the cross-chain transaction.
The method according to claim 1, wherein the transaction content instructing the transaction target chain to pay for the transaction initiation chain demand in the cross-chain transaction comprises:

Calling the execution of the smart contract of the transaction target chain to generate a first transaction instruction, where the first transaction instruction is used to notify the transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction;

Sending the first transaction instruction to the transaction target chain, so that the transaction target chain verifies the first transaction instruction and pays transaction content required by the transaction initiation chain.
The method according to claim 1, wherein the transaction content instructing the transaction initiation chain to pay for the transaction target chain demand in the cross-chain transaction comprises:

Calling the execution of the smart contract of the transaction initiation chain to generate a second transaction instruction, where the second transaction instruction is used to notify the transaction initiation chain to pay the transaction content required by the transaction target chain in the cross-chain transaction;

Sending the second transaction instruction to the transaction initiation chain, so that the transaction initiation chain verifies the second transaction instruction and pays transaction content required by the transaction target chain.
The method according to any one of claims 1-3, wherein the determining a cross-chain transaction to be completed between a transaction initiation chain and a transaction target chain comprises:

Obtaining a cross-chain transaction initiated by the transaction initiation chain;

Detecting whether the cross-chain transaction is recorded in a parallel chain blockchain;

If it is detected that the cross-chain blockchain does not record the cross-chain transaction, it is determined that the cross-chain transaction is a pending cross-chain transaction.
The method according to any one of claims 1 to 3, further comprising:

Obtaining a blockchain of the transaction initiation chain or the transaction target chain;

Update the parallel chain blockchain according to the blockchain of the transaction initiation chain or the transaction target chain.
The method according to claim 5, wherein the updating the parachain blockchain comprises:

Generating summary information according to the blockchain of the transaction initiation chain or the transaction target chain, where the summary information is used to indicate a transaction recorded in the blockchain of the transaction initiation chain or the transaction target chain;

Generate a block including the summary information, and add the block to the parachain blockchain.
A blockchain-based cross-chain transaction device based on a parallel chain, characterized in that the device is deployed in a parallel chain node and includes:

A transaction determination module, for determining a cross-chain transaction to be completed between a transaction initiation chain and a transaction target chain;

A transaction instruction module, configured to instruct a transaction target chain to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to the cross-chain transaction; and when the transaction target chain is detected to complete the payment, instruct the transaction to initiate The transaction content required by the transaction target chain in the cross-chain transaction.
A blockchain system based on a parallel chain is characterized in that the blockchain system includes a transaction initiation chain, a parallel chain, and a transaction target chain, and the parallel chain is composed of the transaction initiation chain and the transaction target. Common nodes of the chain;

The parallel chain is used to determine a cross-chain transaction to be completed between the transaction initiation chain and the transaction target chain; and according to the cross-chain transaction, instruct the transaction target chain to pay for the transaction initiation in the cross-chain transaction Transaction content required by the chain; when it is detected that the transaction target chain completes payment, instruct the transaction initiation chain to pay the transaction content required by the transaction target chain in the cross-chain transaction;

The transaction target chain is configured to pay the transaction content required by the transaction initiation chain in the cross-chain transaction according to an instruction of the parallel chain;

The transaction initiation chain is configured to pay for transaction content required by the transaction target chain in the cross-chain transaction according to an instruction of the parallel chain.