TWI878128B - Cross-chain data transfer systems and computer-implemented methods for cross-chain data transfer - Google Patents

Abstract

Disclosed herein is directed to a cross-chain data transfer system comprising a first blockchain, a second blockchain, a verification module, and a cross-chain node. According to the disclosure of the present embodiment, the verification module is communicatively connected to a user and the first blockchain to receive the user’s requests and verify data accordingly. Additionally, the cross-chain node is communicatively connected to the first and the second blockchain to manage the data transfer process between two blockchains. Also, disclosed herein is a computer-implemented method for cross-chain data transfer.

Description

Cross-chain data transmission system and computer-implemented method for cross-chain data transmission

This disclosure is about the field of blockchain data transmission. Specifically, this disclosure is about a system and computer implementation method for performing data transmission between blockchains.

Blockchain technology was first used as the basic concept for Bitcoin transactions, using a decentralized approach to record transaction information. Specifically, blockchain technology forms each transaction information into a block, connects each block into a chain structure in chronological order, and the new block contains the content of the previous block, making the data on the blockchain less susceptible to tampering. Based on this, the application of blockchain technology has gradually expanded from virtual currency transactions to recording financial-related transactions and other asset management applications.

With the rapid development of blockchain technology and its wide application in supply chain management, voting systems, identity authentication, real estate and real estate, healthcare and intellectual property management, the demand for data processing and storage has increased significantly. However, the performance of a single blockchain is limited, and it is bound to rely on cross-blockchain interaction (e.g. data transmission) to meet various application scenarios.

The most common cross-chain data transmission method is to set up a relay chain as a bridge between different blockchains to achieve the transfer of assets and information between blockchains. However, based on the above structure, cross-chain transmission requires the information to be transmitted to be sent from the source chain to the relay chain first, and then to the target chain. Although the above method can achieve the purpose of cross-chain interaction, the information must be transmitted through a third-party blockchain, which leads to concerns about data security.

In view of this, this field urgently needs a novel cross-chain data transmission technology that can perform data verification, transmission request verification, and cross-chain transmission without going through a third-party blockchain, so as to enhance the security of data in the blockchain interaction process.

The content of the invention is intended to provide a simplified summary of the disclosure so that readers can have a basic understanding of the disclosure. This content of the invention is not a complete overview of the disclosure, and it is not intended to point out the important/key elements of the embodiments of the invention or to define the scope of the invention.

The first aspect of the disclosure is about a cross-chain data transmission system, which operates in a computer host and is used to perform cross-chain data transmission according to a cross-chain transmission request of a client. According to a specific implementation method of the disclosure, the cross-chain data transmission system includes a first blockchain, a second blockchain, a verification module, and a cross-chain node, wherein the first blockchain stores a data; the verification module is connected to the client and the first blockchain in communication, and is used to obtain the data and the cross-chain node from the first blockchain according to the cross-chain transmission request of the client. Information, and generate data proof and chain proof, and transmit the data proof and chain proof to the first blockchain; and the cross-chain node is respectively connected to the first blockchain and the second blockchain to intercept the data proof and chain proof on the first blockchain, and verify the chain proof to generate a verification result, and transmit the verification result to the first blockchain. Accordingly, the first blockchain transmits the data to the second blockchain according to the verification result to complete the cross-chain data transmission.

According to an implementation method of the present disclosure, the cross-chain transmission request includes data to be verified and request information; and the verification module is further used to execute: (a) transmitting the request information to the first blockchain to obtain the data on the first blockchain and the cross-chain information; (b) comparing the data to be verified and the data to generate the data certificate; and (c) generating the on-chain certificate based on the data certificate and the cross-chain information.

In an implementation method of the present disclosure, the cross-chain node is further used to transmit the verification result and data proof to the second blockchain.

In another embodiment of the present disclosure, the second blockchain is further used to verify the data from the first blockchain using data proof.

According to some implementations of the disclosure, the second blockchain stores a private key, and the cross-chain node stores a public key corresponding to the private key. In an implementation of the disclosure, the verification module is further used to obtain the public key from the cross-chain node based on the cross-chain information and transmit it to the first blockchain. According to a specific implementation of the disclosure, the first blockchain encrypts data using the public key to generate encrypted data, and transmits the encrypted data to the second blockchain. In an implementation of the disclosure, the second blockchain is further used to decrypt the encrypted data based on the private key to restore the data.

The second aspect of the disclosure is about a computer implementation method for cross-chain data transmission. According to a specific implementation method of the disclosure, the computer implementation method includes the following steps: (1) providing a cross-chain data transmission system, which is connected to the client for communication, and the cross-chain data transmission system includes a first blockchain, a second blockchain, a verification module and a cross-chain node, wherein the first blockchain stores a data; the second blockchain receives the data from the first blockchain; the verification module is used to receive the data from the second blockchain according to the cross-chain transmission request of the client; A blockchain obtains data and a cross-chain information, and generates a data certificate and an on-chain certificate based on the data and the cross-chain information, and transmits the data certificate and the on-chain certificate to the first blockchain; and a cross-chain node is used to intercept the data certificate and the on-chain certificate, and verify the on-chain certificate to generate a verification result, and transmit the verification result to the first blockchain; and (2) the first blockchain transmits the data to the second blockchain based on the verification result.

According to an implementation method of the present disclosure, the cross-chain transmission request includes data to be verified and request information; the verification module is further used to execute: (a) transmitting the request information to the first blockchain to obtain the data on the first blockchain and the cross-chain information; (b) comparing the data to be verified and the data, and generating a data certificate; and (c) generating an on-chain certificate based on the data certificate and the cross-chain information.

According to another embodiment of the disclosure, the second blockchain stores a private key, and the cross-chain node stores a public key corresponding to the private key. In an embodiment of the disclosure, the verification module is further used to obtain the public key from the cross-chain node based on the cross-chain information.

In another embodiment of the present disclosure, step (2) of the computer implementation method further includes: (2-1) encrypting data using a public key to generate encrypted data, and transmitting the encrypted data to a second blockchain; and (2-2) the second blockchain decrypts the encrypted data using the private key to restore the data. In certain embodiments of the present disclosure, step (1) further includes transmitting the verification result and the data certificate to the second blockchain. According to a specific embodiment of the present disclosure, step (2) further includes verifying the data using the data certificate.

After reading the implementation method below, a person with ordinary knowledge in the technical field to which the present invention belongs can easily understand the basic spirit and other invention purposes of the present invention, as well as the technical means and implementation methods adopted by the present invention.

100, 200: Cross-chain data transmission system

110, 210: The first blockchain

120, 220: Second blockchain

130, 230: Verification module

140, 240: Cross-chain nodes

212: First transaction management module

222: Second transaction management module

S310-S320: Steps

U: Client

In order to make the above and other purposes, features, advantages and implementation methods of the present invention more clearly understood, the attached drawings are described as follows.

FIG. 1 is a schematic diagram of a cross-link data transmission system 100 according to an embodiment of the present disclosure; FIG. 2 is a schematic diagram of a cross-link data transmission system 200 according to another embodiment of the present disclosure; and FIG. 3 is a flowchart of a computer implementation method for cross-link data transmission according to an embodiment of the present disclosure.

According to the usual practice, the various features and components in the figure are not drawn to scale. The drawing method is to present the specific features and components related to the new invention in the best way. In addition, the same or similar component symbols are used to refer to similar components/parts between different figures.

In order to make the description of the disclosure more detailed and complete, the following provides an illustrative description of the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and their sequence for constructing and operating these specific embodiments. However, other specific embodiments can also be used to achieve the same or equal functions and step sequences.

I Definition

For convenience, specific terms used in this specification, embodiments and the attached patent claims are collected here. Unless otherwise defined in this specification, the scientific and technical terms used herein have the same meaning as those understood and used by ordinary knowledgeable persons in the technical field to which the present invention belongs. In addition, where there is no conflict with the context, singular terms used in this specification include plural forms of the terms, and plural terms used also include singular forms of the terms. Specifically, in this specification and the patent claims, the singular forms "a" and "an" include plural references, unless otherwise indicated by the context. In addition, in this specification and the patent claims, the expressions "at least one" and "one or more" have the same meaning, and both represent one, two, three or more.

In the present disclosure, the "client" includes any computer device capable of communicating with at least one server, wherein the communication connection is not limited to a wired or wireless network connection. According to one embodiment of the present invention, the "client" includes at least one graphical display device and a graphical user interface, allowing the user to view information and interact through the application, tool, service or software of the graphical user interface. It is the location where the user interacts with the system through a computer device or terminal. Here, the user of the client is preferably the data transmission party.

In this disclosure, "cross-chain transmission" refers to the interaction and transfer of assets, data or information between different blockchains.

In this disclosure, the term "data proof" refers to a proof generated by verifying the authenticity, integrity, and timestamp of a specific piece of data in blockchain technology or other distributed storage systems.

In this disclosure, the "block proof" refers to the proof generated in blockchain technology or other distributed storage systems to prove that specific data exists on the blockchain.

In this disclosure, the "node" refers to the basic unit of the blockchain network in blockchain technology, which is used to verify transactions, maintain the consistency and security of the blockchain, and coordinate and transmit data. "Cross-chain node" refers to a node set between two blockchains in different blockchain networks, or between two blockchains on the same blockchain network, so that the two blockchains can interact with each other.

In this disclosure, the "public key" and "private key" refer to the corresponding characters generated by the corresponding generation algorithm, which are used to encrypt and decrypt data, digital signatures and identity verification. Generally speaking, the "public key" is publicly available on the Internet and is used to encrypt data, while the "private key" is kept by the user or client to decrypt the data encrypted by the corresponding public key. Therefore, only the person who has the private key can decrypt the data encrypted by the corresponding public key.

II Specific implementation methods

With the rapid development of blockchain technology, business needs are becoming increasingly diverse. For example, financial institutions may have virtual assets and transaction data on different blockchain networks. In order to integrate the management of these assets and transaction data, this demand can only be met through cross-chain interaction. However, current cross-chain operations require verification and transmission through a third-party blockchain (i.e., relay chain), which raises concerns about information security. In order to improve the defects of previous technologies, this disclosure sets up cross-chain nodes to replace relay chains for verification and transmission, and activates a mechanism for direct interaction between blockchains to promote the safe circulation of assets between different blockchains.

1. Cross-chain data transmission system

The present disclosure is intended to provide a cross-chain data transmission system that operates in a computer host and is used to perform data transmission operations between two blockchains based on the operation of the user/client. Figure 1 is a schematic diagram of a cross-chain data transmission system 100 drawn according to a specific implementation method of the present disclosure. As shown in the figure, the cross-chain data transmission system 100 includes a first blockchain 110, a second blockchain 120, a verification module 130 and a cross-chain node 140. The verification module 130 is connected to the client U in communication to receive an operation instruction (i.e., a cross-chain transmission request) from the client U. The verification module 130 is further connected to the first blockchain 110 for verifying the data to be transmitted according to the request of the client U; the cross-chain node 140 is connected to the first and second blockchains 110 and 120 respectively for operating the data transmission process between the blockchains 110 and 120.

In the present disclosure, the first blockchain 110, the second blockchain 120, the verification module 130 and the cross-chain node 140 included in the cross-chain data transmission system 100 are implemented by a processor and a memory contained in a computer host. The processor is used to perform operations, and can be a single processor placed in a server, or multiple processors that perform collaborative operations in a distributed manner. Specific examples are central processing units, digital signal processors, microprocessors, microcontrollers, etc. The memory stores the programs and data executed by the processor, such as various types of static random access memory (SRAM) and dynamic random access memory (DRAM).

The first blockchain 110 stores data that the client U wants to transmit to the second blockchain 120, such as transaction records, asset ownership, identity information or supply chain data, but not limited thereto. The client U sends a cross-chain transmission request to the system through a personal terminal device (e.g., a personal computer, a smart phone or a tablet terminal) to start the subsequent verification and transmission process. The first and second blockchains 110 and 120 are respectively equipped with a smart contract to automatically execute according to pre-set terms and conditions to complete the task requested by the client U (e.g., cross-chain data transmission). In the implementation method of the present disclosure, the first and second blockchains 110 and 120 can be public chains, private chains or alliance chains.

The verification module 130 is used to verify the data on the first blockchain 110. Specifically, the verification module 130 receives a data transmission request from the client U, and establishes a connection with the corresponding blockchain (i.e., the first blockchain 110) according to the data transmission request, and obtains a transaction receipt (including the data to be transmitted and cross-chain information) from the first blockchain 110 to verify the data on the chain, and then generates a data certificate and an on-chain certificate, and transmits the data certificate and the on-chain certificate to the first blockchain 110. The data certificate is used to confirm the correctness and reliability of the on-chain data, and the on-chain certificate is used to verify that the data exists on the designated first blockchain 110. According to an exemplary implementation of the present disclosure, the verification module 130 verifies cross-chain data through zero-knowledge proof technology.

In the present disclosure, the verification module 130 may be node software installed on a personal endpoint device, a browser extension, an application programming interface (API), an application (e.g., a desktop application, a web application, a mobile application, a server application, or an embedded application), or other forms that can provide the client U with input commands to interact with the blockchain.

According to certain implementations of the present disclosure, the cross-chain transmission request includes data to be verified and request information. After the verification module 130 transmits the request information to the first blockchain 110, it obtains the target data stored on the first blockchain 110 and the transmission-related cross-chain information according to the request information, wherein the cross-chain information includes the target chain (i.e., the second blockchain 120) information. Next, the verification module 130 compares the data to be verified from the client U with the data on the first blockchain 110 to confirm whether the data to be transmitted is the same as the data stored on the chain; if the comparison result shows that the two contents are consistent, a data certificate is generated, and a chain certificate is further generated based on the data certificate and cross-chain information; on the contrary, if the comparison result shows that the two contents are inconsistent, the data certificate and the chain certificate cannot be generated, and the data transmission process is interrupted at the same time.

The cross-chain node 140 is connected to the first blockchain 110 and the second blockchain 120 for monitoring events on the blockchain. According to an embodiment of the present disclosure, when the cross-chain node 140 monitors that the first blockchain 110 receives data proof and chain proof from the verification module 130, the cross-chain node 140 intercepts the data proof and chain proof, and uses the verification function module on the cross-chain node 140 to verify the chain proof to generate a verification result; it should be noted that the cross-chain node 140 only captures the content of the data proof and chain proof, and there is no actual data transmission between the first blockchain 110 and the cross-chain node 140. Finally, the cross-chain node 140 returns the verification result to the first blockchain 110, updates the verification status of the proof on the chain, and the first blockchain 110 can establish a connection with the second blockchain 120 (i.e., communicate with each other) based on the verification result, and transmit the data to the second blockchain 120. Specifically, the aforementioned verification result includes the result of verifying the block header information generated by the cross-chain transmission, which notifies the first blockchain 110 to transmit the data to the second blockchain 120 in a point-to-point manner.

According to the non-essential implementation method of the present disclosure, the cross-chain node 140 includes a distributed ledger to store blockchain transaction records and cross-chain interaction information, such as the source (i.e., the first blockchain 110), destination (i.e., the second blockchain 120) and status of the cross-chain transaction to ensure the transparency and irreversibility of the transaction.

In order to further improve the reliability of cross-chain interactive transmission and confirm the correctness of the source chain and the target chain, in the cross-chain data transmission system 100, the second blockchain 120 will also verify the data. According to some implementations of the present disclosure, the cross-chain node 140 transmits the aforementioned verification result and data proof to the second blockchain 120. In an implementation of the present disclosure, the second blockchain 120 is further used to verify the data from the first blockchain 110 using the data proof. Specifically, after the cross-chain node 140 generates the verification result, it transmits the verification result to the first and second blockchains 110 and 120 at the same time to update the verification status of the on-chain proofs on the two blockchains, and transmits the data proof intercepted from the first blockchain 110 to the second blockchain 120 for the second blockchain 120 to verify the data from the first blockchain 110.

According to an optional implementation method of the present disclosure, the first blockchain 110 further encrypts the data before transmitting the data. It can use any symmetric encryption or asymmetric encryption algorithm known in the art (for example: RSA algorithm, Elliptic Curve Digital Signature Algorithm (ECDSA), Edwards-curve Digital Signature Algorithm (EdDSA), Elliptic Curve Diffie-Hellman (ECDH) algorithm, Discrete Logarithm Problem (DLP) algorithm, but not limited to these) to generate public and private keys to encrypt data to avoid the possibility of data leakage during transmission. In a specific implementation of the first disclosure, the cross-chain data transmission system 100 uses asymmetric encryption to encrypt data, wherein a private key is stored on the second blockchain 120, and a public key corresponding to the private key is stored on the cross-chain node 140; the first blockchain 110 obtains the public key through the verification module 130 to encrypt the data, and transmits the encrypted data to the second blockchain 120. According to a specific implementation of the first disclosure, the verification module 130 obtains the public key of the second blockchain 120 from the cross-chain node 140 according to the cross-chain information, and transmits it to the first blockchain 110 together with the data certificate and the chain certificate. Accordingly, after receiving the encrypted data, the second blockchain 120 can use its private key to decrypt it to obtain the original data. In other words, if the first blockchain 110 encounters an abnormality during the transmission process and transmits the data to the wrong blockchain, the blockchain will not be able to successfully decrypt the encrypted data because it does not hold the corresponding private key, which can ensure that the data will not be leaked to unrelated third parties.

Based on the above, it can be imagined by those with ordinary knowledge in the field that the first blockchain 110 and the second blockchain 120 refer to a network including blockchains, that is, nodes that execute smart contracts, and other functional modules (such as transaction management modules), so as to complete the mutual operation between blockchains.

Please refer to FIG. 2, which is a schematic diagram of a cross-chain data transmission system 200 according to a specific implementation of the present disclosure. As shown in FIG. 2, the cross-chain data transmission system 200 is substantially the same as the cross-chain data transmission system 100 in structure, and includes a first blockchain 210, a second blockchain 220, a verification module 230, and a cross-chain node 240, wherein the verification module 230 is connected to the client U and the first blockchain 210 in communication, and the cross-chain node 240 is connected to the first and second blockchains 210 and 220 in communication, respectively, to perform verification and operate cross-chain data transmission. However, the difference between the two is that the first blockchain 210 and the second blockchain 220 of the cross-chain data transmission system 200 are respectively provided with a first transaction management module 212 and a second transaction management module 222, wherein the first blockchain 210 and the second blockchain 220 communicate with each other using the first transaction management module 212 and the second transaction management module 222 to perform the aforementioned data encryption and decryption and cross-chain transmission procedures.

Specifically, after the first transaction management module 212 on the first blockchain 210 confirms that the verification status of the on-chain proof has changed, it calls the data to be transmitted from the first blockchain 210, and uses the public key obtained from the cross-chain node 240 to encrypt it, and then transmits the encrypted data to the second transaction management module 222 through the first transaction management module 212. After receiving the encrypted data, the second transaction management module 222 uses its private key to decrypt it to restore it to the original data, and then uses the data obtained from the cross-chain node 240 to prove the correctness of the data. When the verification is successful, the task of transmitting the data to the second blockchain 220 is completed. That is, the second transaction management module 222 will write the acquired data into the second blockchain 220 after secondary verification (decryption by private key and verification of original data using data proof).

2. Computer implementation method for cross-chain data transmission

This disclosure also provides a computer implementation method for performing cross-chain data verification and transmission using the cross-chain data transmission system 100 or 200 of the present invention. The security and reliability of cross-chain data transmission can be further improved by the method of the present invention.

FIG. 3 is a flowchart of a computer implementation method for cross-chain data transmission according to an implementation method of the present disclosure. As shown in FIG. 3, the computer implementation method includes the following steps: S310: providing a cross-chain data transmission system for communication connection with a client; and S320: transmitting data from the first blockchain to the second blockchain according to the verification result.

In step S310, the client uses a personal terminal device to connect to the cross-chain data transmission system to submit a cross-chain transmission request. The cross-chain data transmission system includes a first blockchain, a second blockchain, a verification module, and a cross-chain node. The connection relationship and function between each component are substantially the same as those of the cross-chain data transmission system 100 or 200. In simple terms, the first blockchain is the source chain, which stores the data to be transmitted; the second blockchain is the target chain, which is used to receive the data from the first blockchain to complete the cross-chain data transmission; the verification module obtains the data and cross-chain information from the first blockchain according to the cross-chain transmission request input by the client, and generates data proof and chain proof according to the data and cross-chain information, and transmits the data proof and chain proof to the first blockchain; and the cross-chain node is used to monitor the events occurring on the first blockchain, and intercept the data proof and chain proof to verify the chain proof to generate the verification result, and transmit the verification result to the first blockchain.

According to an implementation method of the present disclosure, the cross-chain transmission request includes data to be verified and request information, and the verification module can generate data proof and on-chain proof through the following steps: (a) sending the request information to the first blockchain to obtain the data on the first blockchain and the cross-chain information; (b) comparing the data to be verified and the data to generate data proof; and (c) generating on-chain proof based on the data proof and the cross-chain information.

Then, in step S320, the first blockchain transmits the data to the second blockchain via peer-to-peer transmission based on the verification result.

According to a specific implementation of the disclosed content, the cross-chain data transmission system generates a set of corresponding public keys and private keys through an encryption algorithm to ensure the security of data during the cross-chain data transmission process, wherein the public key is stored in the cross-chain node and the private key is stored in the second blockchain. In the implementation of the disclosed content, the verification module can request and obtain the public key from the cross-chain node based on the cross-chain information, and transmit the public key together with the data proof and the on-chain proof to the first blockchain.

Accordingly, step S320 further includes encrypting the data using a public key to generate encrypted data, and transmitting the encrypted data to the second blockchain, and the second blockchain decrypts the encrypted data using a private key to restore and obtain the data.

In addition, in an optional implementation of the disclosed content, the cross-chain node can also transmit the verification results and data proof to the second blockchain. Therefore, after the second blockchain obtains the data, it can further use the data proof to verify the data, thereby improving the reliability of the data content.

In summary, the present disclosure provides a cross-chain data transmission system and a method for cross-chain data transmission using the system, by setting up a verification module to confirm the correctness of the data on the blockchain, and setting up a cross-chain node to manage the data transmission process between the two blockchains, thereby replacing the cross-chain blockchain (i.e., relay chain) to avoid data transmission through a third-party blockchain, thereby improving the security of cross-chain operations.

100: Cross-chain data transmission system

110: The first blockchain

120: Second blockchain

130: Verification module

140: Cross-chain node

U: Client

Claims (15)

A cross-chain data transmission system operates in a computer host and is used to perform cross-chain data transmission according to a cross-chain transmission request from a client, comprising: A first blockchain storing data; A second blockchain; A verification module communicating with the client and the first blockchain, and used to obtain the data and cross-chain information from the first blockchain according to the cross-chain transmission request of the client, and generate a data certificate and an on-chain certificate, and transmit the data certificate and the on-chain certificate to the first blockchain; and A cross-chain node is respectively connected to the first blockchain and the second blockchain for intercepting the data proof and the chain proof on the first blockchain, and verifying the chain proof to generate a verification result, and transmitting the verification result to the first blockchain; Wherein, the first blockchain transmits the data to the second blockchain according to the verification result to complete the cross-chain data transmission. A cross-chain data transmission system as described in claim 1, wherein the cross-chain transmission request includes a data to be verified and a request information, and the verification module is further used to perform: (a) transmitting the request information to the first blockchain to obtain the data and the cross-chain information on the first blockchain; (b) comparing the data to be verified and the data to generate the data certificate; and (c) generating the on-chain certificate based on the data certificate and the cross-chain information. A cross-chain data transmission system as described in claim 1, wherein the cross-chain node is further used to transmit the verification result and the data proof to the second blockchain. A cross-chain data transmission system as described in claim 3, wherein the second blockchain is further used to verify the data from the first blockchain using the data proof. A cross-chain data transmission system as described in claim 1, wherein the second blockchain stores a private key, and the cross-chain node stores a public key corresponding to the private key. In the cross-chain data transmission system as described in claim 5, the verification module is further used to obtain the public key from the cross-chain node based on the cross-chain information and transmit it to the first blockchain. A cross-chain data transmission system as described in claim 6, wherein the first blockchain encrypts the data using the public key to generate encrypted data, and transmits the encrypted data to the second blockchain. A cross-chain data transmission system as described in claim 7, wherein the second blockchain is further used to decrypt the encrypted data based on the private key to restore the data. A computer implementation method for cross-chain data transmission, comprising: (1) providing a cross-chain data transmission system, which is connected to a client for communication, and the cross-chain data transmission system comprises a first blockchain, a second blockchain, a verification module and a cross-chain node, wherein the first blockchain stores a data; the second blockchain receives the data from the first blockchain; The verification module is used to obtain the data and a cross-chain information from the first blockchain according to a cross-chain transmission request of the client, and to generate a data certificate and an on-chain certificate according to the data and the cross-chain information, and to transmit the data certificate and the on-chain certificate to the first blockchain; and The cross-chain node is used to intercept the data certificate and the on-chain certificate, and to verify the on-chain certificate to generate a verification result, and to transmit the verification result to the first blockchain; and (2) the first blockchain transmits the data to the second blockchain according to the verification result. A computer implementation method as described in claim 9, wherein the cross-chain transmission request includes a data to be verified and a request information, and the verification module is further used to execute: (a) transmitting the request information to the first blockchain to obtain the data and the cross-chain information on the first blockchain; (b) comparing the data to be verified and the data, and generating the data proof; and (c) generating the on-chain proof based on the data proof and the cross-chain information. A computer-implemented method as described in claim 9, wherein the second blockchain stores a private key, and the cross-chain node stores a public key corresponding to the private key. A computer-implemented method as described in claim 11, wherein the verification module is further used to obtain the public key from the cross-chain node based on the cross-chain information. A computer implementation method as described in claim 12, wherein step (2) further includes: (2-1) encrypting the data using the public key to generate encrypted data, and transmitting the encrypted data to the second blockchain; and (2-2) the second blockchain decrypting the encrypted data using the private key to restore the data. A computer-implemented method as described in claim 13, wherein step (1) further includes transmitting the verification result and the data proof to the second blockchain. A computer-implemented method as described in claim 14, wherein step (2) further includes using the data to prove and verify the data.

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