TWI824173B - A method of mixing public blockchains with private blockchains and computer readable medium - Google Patents

Abstract

The present invention is a method for mixing public blockchains with private blockchains. The method includes: providing a private blockchain managed by a hybrid chain service system, and deploying a smart contract on a public blockchain; hashing a new block to generate a block hash when the block is generated by the private blockchain; generating a first time stamp signature form the hash block through a time stamp service organization; generating a second time stamp signature form the first time stamp signature through the hybrid chain service system; and publishing the second time stamp signature. Accordingly, the private blockchain transactions that are not anchored to the public blockchain also has credible in the present invention. The present invention further provides a computer-readable medium for performing the method for mixing public blockchains with private blockchains.

Description

A method of mixing public blockchain with private blockchain and computer-readable medium

The present invention relates to the technology of hybrid blockchain, and particularly refers to a method of mixing a public blockchain with a private blockchain.

Blockchain is a technology that uses distributed nodes to store, transmit, and verify network data. The main feature of blockchain is decentralization, that is, each node on the blockchain needs to transmit, verify, and manage itself. . In short, in order to achieve the shareability of the blockchain and eliminate the need for users to rely on additional management or hardware equipment to reduce the need for central mechanisms, not only the data on the blockchain are stored in different clouds, but also the computing and storage are It is decentralized.

Since the blockchain technology is open source, except for the encryption of transaction information, the rest of the computing data is open, making the blockchain open and anyone can query the data of the blockchain; in addition, the blockchain The chain system does not need to rely on a third party and is independent, which also reduces other external interference. Although the blockchain is open and independent, there are also issues of security and anonymity. However, based on the blockchain's decentralized computing, it reduces the risk of data being arbitrarily used. It is possible to modify, and the information on the blockchain does not need to be publicly verified, so the information can be transmitted anonymously, which dilutes the above security and anonymity issues.

Although blockchain has many advantages, it is still not widely used because blockchain cannot perfectly achieve the three points of performance, security, and decentralization. Therefore, there are many ways to use private blockchains as public areas. The side chain of the blockchain anchors the transactions of the private blockchain to the public blockchain, so that security and decentralization can be built on the public blockchain and on the private blockchain. It can greatly increase the performance. However, there is a major problem in the above architecture, that is, there is no security certification before the private blockchain is anchored to the public blockchain. That is, it is impossible to determine whether the private blockchain is secure before anchoring. Correct.

Therefore, if a hybrid blockchain technology can be found, especially when a public blockchain is mixed with a private blockchain, it can ensure that the private blockchain has not been tampered with and is correct, thereby improving the public blockchain hybrid private blockchain. The security of blockchain will become a goal that people in this technical field are eager to pursue solutions for.

In order to solve the above-mentioned problems of the prior art, the present invention discloses a method of mixing a public blockchain with a private blockchain, which includes the following steps: providing a private blockchain managed by a hybrid chain service system, and adding a private blockchain to a public blockchain. Deploying a smart contract; causing the private blockchain to generate a new block with block hash; causing the hybrid chain service system to hash the block through a timestamp service agency to generate a timestamp signature; causing the hybrid chain The service system signs the timestamp signature again to obtain the time signature: and publishes the time signature.

In one embodiment, the step of disclosing the time signature includes disclosing it using a public web page or InterPlanetary File System (IPFS).

In another embodiment, the step of the private blockchain generating a new block means that the private blockchain uses a consensus algorithm to generate the block based on a transaction request.

In another embodiment, the smart contract is used to store the anchor hash value and anchor hash height when the private blockchain is anchored to the public blockchain.

In the above method, including if the published time signature is inconsistent with the time signature obtained by the user, the earlier generation time will be the correct one.

In the aforementioned method, when the hybrid chain service system performs anchoring, it includes: querying the previously anchored block height in the smart contract of the public blockchain; querying the latest block height of the private blockchain; Generate an anchor hash for the time signature of the unanchored block; and record the anchor hash and the height of the block to a smart contract on the public blockchain.

In the aforementioned method, the hybrid chain service system receiving the transaction sent by the user includes: when the user sends the transaction to the private blockchain, causing the transaction to be included in the block; using transaction hash Query the private blockchain for the block hash; and generate the time signature for the block hash.

In the aforementioned method, it also includes the user's real-time audit of the private blockchain, which includes: after the user confirms the transaction, obtaining the time signature of the block; using the public key pair of the hybrid chain service system Decrypt the timestamp signature to obtain the timestamp signature of the timestamp service organization; use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the block hash timestamp; and compare the The block hash decrypted by the timestamp signature and the block hash obtained from the private blockchain.

In the aforementioned method, the user's audit of the anchored block includes: the user specifies an anchor hash in the hybrid chain service system to issue an audit request; and obtains the anchor block in the hybrid chain service system. All time signatures; calculate the hash of all time signatures to compare with the anchor hash of the public blockchain, and use the public key of the hybrid chain service system to decrypt all time signatures within the range to Obtain the timestamp signature of the timestamp service organization; use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the hash time stamp of the block; obtain the anchor block in the private blockchain block hash; and compare the block hash after decryption of the timestamp signature with the block hash obtained from the private blockchain and check its chronological order.

In addition, all time signatures of the anchor blocks in the aforementioned hybrid chain service system are public.

The present invention further provides a computer-readable medium, which is used in a computing device or a computer and stores instructions to execute the above-mentioned method of mixing a public blockchain with a private blockchain.

It can be seen from the above that in order to ensure the security of the private blockchain when anchored to the public blockchain, the present invention adds a timestamp service organization to the original private blockchain anchored to the public blockchain architecture. This makes the private blockchain secure before anchoring it to the public blockchain. In short, when the private blockchain is anchored to the public blockchain, a timestamp signature is first generated through a timestamp service organization to ensure that the blocks of the private blockchain have credibility. After that, the hybrid chain service system The timestamp signature is signed again to generate a time stamp for public review, so that other users can determine whether the transaction has been confirmed, and the method of the present invention can also allow users to conduct audits , such as the audit of private blockchains or audits of anchored blockchains. If a problem occurs, the responsibility can be clarified when the signature is non-repudiation.

201-203:Process

301-304:Process

401-404:Process

501-505:Process

601-605:Process

701-705:Process

S11-S15: Steps

Figure 1 is a step diagram of the method of mixing a public blockchain with a private blockchain according to the present invention.

Figure 2 is a startup flow chart of the hybrid chain service system of the present invention.

Figure 3 is a flow chart for generating time signatures in the hybrid chain service system of the present invention.

Figure 4 is a flow chart of anchoring execution by the hybrid chain service system of the present invention.

Figure 5 is a flow chart of a user sending a transaction in the method of the present invention.

Figure 6 is a flow chart of auditing the private blockchain in the method of the present invention.

Figure 7 is a flow chart of auditing anchored blocks in the method of the present invention.

The following describes the technical content of the present invention through specific embodiments. Those familiar with the art can easily understand the advantages and effects of the present invention from the content disclosed in this specification. However, the present invention can also be implemented or applied through other different specific implementation forms.

Figure 1 is a step diagram of the method of mixing a public blockchain with a private blockchain according to the present invention. The main purpose of this invention is to ensure that the blocks of the private blockchain have credibility when anchoring the private blockchain to the public blockchain. Therefore, it is proposed to use a Time Stamp Authority (TSA) to manage the private area. The newly generated blocks in the blockchain are signed, so that it can be verified whether the blocks in the blockchain have been modified before being anchored.

In step S11, a private blockchain managed by the hybrid chain service system is provided, and a smart contract is deployed on the public blockchain. This step explains that the private blockchain itself is composed of a hybrid chain Service system management, and before anchoring the private blockchain managed by the hybrid chain service system to the public blockchain, a smart contract needs to be deployed in the public blockchain to facilitate the hash correlation between the two. Data can be logged.

In one embodiment, the smart contract is used to store the anchor hash value and anchor hash height when the private blockchain is anchored to the public blockchain.

In step S12, the private blockchain is caused to generate a new block with block hash. This step explains the situation where the private blockchain generates a new block, and the block originally has a block hash (Block hash), and the private blockchain generates a new block, usually it is collected in the private blockchain After receiving the user's transaction request, a new block is generated according to the consensus algorithm used.

In step S13, the hybrid chain service system is caused to hash the block through a timestamp service agency to generate a timestamp signature. In order to ensure the correctness of the private blockchain before anchoring, this step is for the hybrid chain service system to hash the blocks from the previous step and generate a timestamp signature through an external timestamp service agency. It is based on the corresponding transaction generator, and the correctness of the private blockchain before anchoring can be ensured through the generation time.

In step S14, the hybrid chain service system is asked to sign the timestamp signature again to obtain the time signature. In order to ensure that the transaction is initiated by the hybrid chain service system, in this step, the hybrid chain service system will sign the aforementioned timestamp signature again to obtain the time signature. In short, this time signature is a signature that has passed two procedures, so it can provide two verifications of the transaction generation time and whether it is a hybrid chain service system.

In step S15, the time signature is disclosed for review. This step explains that the time signature will be made public so that everyone can obtain the time signature to verify whether the transaction is correct. In one embodiment, a public web page or InterPlanetary File System (IPFS) can be used to make the time signature public.

In one embodiment, the user decrypts the signature using the corresponding public key to obtain the hash value (Hash) in the signature, thereby achieving the purpose of verification. When the user obtains the time signature, he or she can The public time signature is compared to ensure the correctness of the private blockchain when anchored to the public blockchain. If the time signature obtained by the user is inconsistent with the public time signature, an error will occur. The one with an earlier time is correct. That is to say, if the block is tampered with, an earlier timestamp cannot be obtained, so the one with an earlier time is considered correct.

The present invention is described below with a specific example. When the method described in the present invention is to be executed, the overall architecture will include a hybrid chain service system, a timestamp service authority (TSA), a public blockchain with smart contract functions, and a hybrid chain service system. For the private blockchain managed by the chain service system, before the hybrid chain service system starts serving, a smart contract must be deployed on the public blockchain to store the anchored hash value and anchored hash height.

In the aforementioned architecture, when a user issues a transaction to the private blockchain, the private blockchain will generate a new block (Block) according to the consensus algorithm used, and the new block will have a block hash (Block). hash), and then the timestamp service organization can be used to generate a timestamp signature of the time. Then, the hybrid chain service system will sign the timestamp signature again to generate a time signature, and make this time signature public to the public. Available for review, such as on an open web page or the InterPlanetary File System (IPFS). The consensus algorithm used above refers to the consensus algorithm used by default in private blockchains, which can be, for example, but not limited to: Proof of Work (POW), Proof of Stake (POS), and Proof of Authority. (Proof of Authority, POA).

In summary, it can be seen that the signature of the timestamp service organization ensures the time of generation, and the signature of the hybrid chain service system proves that this action was initiated by this service system (that is, the hybrid chain service system using the present invention). The above-mentioned The program can make the blocks of the private blockchain have credibility. The reason why it is credible is because the manager of the private blockchain is a hybrid chain service system. Through this system, it is responsible for consensus and generation of new blocks. After the transaction is sent, the user will The private blockchain confirms whether the transaction has been included in the block. If the timestamp signature generated by the hybrid chain service system can be obtained, the transaction can be deemed to have been confirmed. On the contrary, if the timestamp signature obtained by the user appears, If it is inconsistent with the timestamp signature disclosed by the hybrid chain service system, the earlier generation time will be the correct one, because the timestamp service organization must be an impartial third party, and the tampered block cannot obtain a time signature earlier than the one that has been published. An earlier time stamp, so the time signature includes the signature of the user and the hybrid chain service system, so it is non-repudiation. Once the data is tampered with, the signature can be used to clarify the attribution of responsibility, so as to further claim compensation according to the service contract.

In one embodiment, when performing anchoring, the hybrid chain service system will perform the following steps: query the previously anchored block height in the smart contract of the public blockchain, query the latest block height of the private blockchain, and The time signature of the unanchored block generates the anchor hash, and a smart contract records the anchor hash and block height to the public blockchain.

In a specific example, the hybrid chain service system will regularly anchor the blocks of the private blockchain. First, it first goes to the smart contract of the public blockchain to query the height of the last anchored block, and then goes to the private blockchain. Query the latest block height. Then, the hybrid chain service system generates an anchoring hash for the time signature of the unanchored block, and records the anchoring hash and block height to the smart contract of the public blockchain to complete the anchoring. Certainly.

In one embodiment, when the hybrid chain service system receives a transaction sent by a user, it will perform the following steps: when the user sends a transaction to the private blockchain, include the transaction in the block, and then use the transaction The hash queries the private blockchain for the block hash and generates the time signature for the block hash.

In a specific example, the user can directly send a transaction to the private blockchain. The process of sending the transaction includes the user sending the transaction to the private blockchain, waiting for the transaction to be included in the block, and then using the transaction hash to send the transaction to the private blockchain. Query the block hash and wait for the hybrid chain service system to hash the block to generate a time signature (which also includes generating a timestamp signature through the timestamp service agency). After finally obtaining the time signature, the transaction is completed.

In the audit part, the user's audit is divided into two types. The first is real-time audit of the private blockchain, and the second is the audit of anchored blocks.

When the user performs real-time audit of the private blockchain, the following steps will be performed: After the user confirms the transaction, the time signature of the block is obtained, and then the public key of the hybrid chain service system is used to decrypt the time signature. , to obtain the timestamp signature generated by the timestamp service organization, and then use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the block hash timestamp. Finally, compare the time stamp The block hash decrypted by the signature and the block hash obtained from the private blockchain.

In a specific example, after the user confirms the transaction, he will obtain the time signature of the block. For auditing, the block hash can be obtained from the private blockchain and decrypted using the public key of the hybrid chain service system. After obtaining the timestamp signature of the timestamp service organization, the public key of the timestamp service organization is used to decrypt the timestamp signature to obtain the block hash and time stamp. Finally, the two block hashes are compared to see if they are consistent, that is Audit can be completed.

When auditing the anchored block, the following steps will be performed: When the user issues an audit request to the hybrid chain service system by specifying an anchor hash, all time signatures of the anchored blocks in the hybrid chain service system are obtained. Then, the hash of all time signatures is calculated to compare with the anchor hash of the public blockchain, and the public key of the hybrid chain service system is used to decrypt all time signatures in the range, thereby obtaining the time stamp service organization's hash. Timestamp signature: Use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the block hash and timestamp. In addition, obtain the block hash of the anchor block in the private blockchain. Finally, Compare the decrypted block hash from the timestamp signature with the block hash obtained from the private blockchain and check whether the time sequence is correct.

In a specific example, the user issues an audit request to the hybrid chain service system by specifying an anchor hash, and obtains all public time signatures of the anchor block of the hybrid chain service system. Then, the hash of all time signatures is calculated and compared with The anchor hash of the public blockchain is compared, and then the public key of the hybrid chain service system is used to decrypt all the time signatures in the range, and then the timestamp signatures of the timestamp service organization are obtained, and then the timestamp signatures of the timestamp service organization are obtained. The public key decrypts the timestamp signature to obtain the block hash and timestamp. Then, it goes to the private blockchain to obtain the block hash of the anchor block, compares the block hashes obtained by the two, and checks If the time sequence is correct, the audit is completed.

Figure 2 is a startup flow chart of the hybrid chain service system of the present invention.

As shown in the figure, in process 201, the hybrid chain service system deploys smart contracts on the public blockchain. This process, that is, the hybrid chain service system will first deploy the smart contract to the public blockchain. The smart contract is used to store the anchored hash value and anchored hash height.

In process 202, the hybrid chain service system checks the smart contract deployment status on the public blockchain. This process is to determine whether the deployment of the smart contract is completed. If the deployment is completed, it will enter process 203. Otherwise, it will continue to stay in process 202 and wait for the deployment of the smart contract to be completed.

In process 203, the hybrid chain service system service starts.

Figure 3 is a flow chart for generating time signatures in the hybrid chain service system of the present invention.

As shown in the figure, in process 301, the private blockchain receives user transactions. In this process, users can directly issue transaction requests to the private blockchain.

In process 302, the private blockchain uses a consensus algorithm to generate blocks. In this process, the private blockchain will generate new blocks according to the consensus algorithm used.

)利用時戳服務機構(O)產生時間(T _n )之時戳簽章(

)，混合鏈服務系統再對其時戳簽章再簽一次簽章(

)，以產生時間簽章(

)。 In process 303, the hybrid chain service system uses block hashing to generate a timestamp. In this process, the hybrid chain service system will instantly monitor whether the private blockchain generates new blocks. In the current process, when a new block is generated ( B _n , a block with a height of n), the hybrid chain service system ( S ) will hash the block (

) Use the timestamp service organization ( O ) to generate a timestamp signature ( T _n ) for the time (T n)

), the hybrid chain service system signs the timestamp and signs it again (

), to generate a time signature (

).

In process 304, the hybrid chain service system discloses the timestamp of the block. This process explains that the timestamp will be made public for users to view, which can be made public through an open web page or the InterPlanetary File System (IPFS).

Figure 4 is a flow chart of anchoring execution by the hybrid chain service system of the present invention.

As shown in the figure, in process 401, the hybrid chain service system queries the public blockchain for the last anchored block height. In this process, the hybrid chain service system regularly anchors the blocks of the private blockchain. Among them, the smart contract of the public blockchain will first query the last anchored block height ( h -1).

)。 In process 402, the hybrid chain service system uses the time signature of the unanchored block to generate an anchored hash for the private blockchain. In this process, the hybrid chain service system will query the private blockchain for the latest block height ( k ), and generate an anchor hash ( k ) for the time signature of the unanchored block.

).

In process 403, the hybrid chain service system records the block height and anchor hash in the public blockchain. This process is to record the anchor hash and block height into the smart contract of the public blockchain to facilitate subsequent query and audit.

In process 404, the anchoring of the hybrid chain service system is completed.

Figure 5 is a flow chart of a user sending a transaction in the method of the present invention.

As shown in the figure, in process 501, the user sends a transaction to the private blockchain. This process means that the user sends a transaction ( Tx ) to the private blockchain.

)向私有區塊鏈查詢區塊雜湊(

)，若完成，前進流程503，反之則停留在流程502直到此流程執行完畢。 In process 502, the user queries the block hash using the transaction hash on the private blockchain. This process waits for the transaction to be included in the block ( B _n , a block with height n), and uses transaction hash (

) queries the private blockchain for the block hash(

), if completed, proceed to process 503, otherwise, stay in process 502 until the execution of this process is completed.

)，若完成，前進流程504，反之則回到流程503直到此流程執行完畢。 In process 503, the user uses the block hash query timestamp to sign the hybrid chain service system. Waiting for the time signature generated by the hybrid chain service system on the block hash (

), if completed, proceed to process 504, otherwise return to process 503 until the execution of this process is completed.

In process 504, the user saves the timestamp signature and the transaction is completed. This process explains that after obtaining the time signature, the transaction is completed.

Figure 6 is a flow chart of auditing the private blockchain in the method of the present invention.

)。 As shown in the figure, in process 601, the user obtains the time signature of the block from the hybrid chain service system. This process means that after the user confirms the transaction, he will obtain the time signature of the block (

).

)。 In process 602, the user uses transaction hash on the private blockchain to obtain the block hash. This process obtains the block hash (

).

)進行解密(

)，以產生時戳服務機構的時戳簽章(

T _n ))，接著，再使用時戳服務機構之公鑰對時戳簽章(

)進行解密，以取得區塊雜湊及時戳(

,T _h )，之後，將本步驟取得之區塊雜湊(

)與流程602取得之區塊雜湊(

)進行比對。 In process 603, the user verifies the block hash and time signature. This process is for verification, including time signature using the public key of the hybrid chain service system (

) to decrypt (

) to generate the timestamp signature of the timestamp service organization (

T _n )), and then use the public key of the timestamp service organization to sign the timestamp (

) to decrypt to obtain the block hash timestamp (

, T _h ), and then hash the block obtained in this step (

) and the block hash ( obtained by process 602

) for comparison.

After the foregoing comparison, if they match, then proceed to process 604, and the user audit is completed, that is, if the verification is successful, the audit is completed. Otherwise, if they do not match, then proceed to process 605, the user audit has failed, and the data has been tampered with.

Figure 7 is a flow chart of auditing anchored blocks in the method of the present invention.

As shown in the figure, in process 701, the user issues an audit request to the specified anchor hash of the hybrid chain service system. This process is where the user issues an audit request to the hybrid chain service system, and the audit object is the user-specified anchor hash.

,

,...,

)。 In process 702, the hybrid chain service system returns the anchor block time signature to the user. This process is to obtain all public timestamp signatures of the anchor block of the hybrid chain service system (

,

,...,

).

)，使用混合鏈服務系統之公鑰將範圍內所有時間簽章進行解密(

)，以取得時戳服務機構的時戳簽章(

)，接著，再使用時戳服務機構之公鑰對時戳簽章(

)，以取得區塊雜湊及時戳(

,T _h )，另外，至私有區塊鏈取得錨定區塊之區塊雜湊(

,

,...,

)，最後，將兩處取得之區塊雜湊進行比對並檢查時間順序是否正確(T _h <T _h+1<…<T _k )。 In process 703, the user verifies the block hash and time signature. Verification of this process involves calculating the hash of all time signatures and comparing it with the anchor hash of the public blockchain (

), use the public key of the hybrid chain service system to decrypt all time signatures within the range (

) to obtain the timestamp signature from the timestamp service agency (

), and then use the public key of the timestamp service organization to sign the timestamp (

) to obtain the block hash timestamp (

, T _h ), in addition, go to the private blockchain to obtain the block hash of the anchor block (

,

,...,

), finally, compare the block hashes obtained from the two places and check whether the time sequence is correct ( T _h < T _{h +1} <...< T _k ).

After the aforementioned comparison, if they match, then proceed to process 704, and the user audit is completed, that is, the verification is successful and the audit is completed. Otherwise, if they do not match, then proceed to process 705, the user audit failed, and the data has been tampered with.

In addition, the present invention also discloses a computer-readable medium, which is applied to a computing device or computer having a processor (eg, CPU, GPU, etc.) and/or a memory, and stores instructions, and can utilize the computing device or computer. The computer executes the computer-readable medium through the processor and/or memory to perform the above methods and steps when executing the computer-readable medium.

To sum up, the method and computer-readable medium of mixing a public blockchain with a private blockchain in the present invention mainly add a timestamp service organization to the architecture in which the private blockchain is anchored to the public blockchain, so that Private blockchains are secure even before they are anchored to the public blockchain. In short, in addition to the original signature of the hybrid chain service system, through the hybrid chain service system, the private blockchain anchor Timing, a signature is performed first to ensure that the private blockchain has credibility before being anchored. In this way, the present invention can make private blockchain transactions that are not anchored to the public blockchain also have credibility. In addition, the present invention also allows users to conduct audit transactions. The audit content includes the signatures of each role, so it is non-repudiation. If a problem occurs, it is easy to clarify the responsibility.

The above embodiments are only illustrative and not intended to limit the present invention. Anyone skilled in the art can make modifications and changes to the above embodiments without departing from the spirit and scope of the invention. Therefore, the scope of rights protection of the present invention is defined by the scope of the patent application attached to the present invention. As long as it does not affect the effect and implementation purpose of the present invention, it should be covered by this disclosed technical content.

S11-S15: Steps

Claims (11)

A method of mixing a public blockchain with a private blockchain includes the following steps: providing a private blockchain managed by a hybrid chain service system, and deploying a smart contract on the public blockchain, wherein the smart contract is It is used to record the relevant data when the public blockchain and the private blockchain are anchored; to cause the private blockchain to generate a new block with block hash; to have the hybrid chain service system hash the block through A timestamp service agency generates a timestamp signature; the hybrid chain service system signs the timestamp signature again to obtain a time signature, where the time signature is used to provide the transaction generation time and whether it is The hybrid chain service system proposes two verifications: and the disclosure of the time signature. The method of mixing a public blockchain with a private blockchain as described in claim 1, wherein the step of disclosing the time signature includes disclosing it using a public web page or an interstellar file system. The method of mixing a public blockchain with a private blockchain as described in claim 1, wherein the step for the private blockchain to generate a new block means that the private blockchain uses a consensus algorithm to generate a new block based on a transaction request. the block. The method of mixing a public blockchain with a private blockchain as described in request 1, wherein the smart contract is used to store the anchor hash value and anchor hash height when the private blockchain anchors the public blockchain. , and among them, the anchor hash value and the anchor hash height are respectively generated by the hybrid chain service system based on the time signature when the hybrid chain service system executes anchoring. The data corresponding to the anchor hash that is the target of the audit when the system is audited, and the number of areas of the data. The method of mixing a public blockchain with a private blockchain as described in request 1 also includes that if the public time signature is inconsistent with the time signature obtained by the user, the earlier generation time will be the correct one. The method of mixing a public blockchain with a private blockchain as described in request item 1 includes: when the hybrid chain service system performs anchoring, it includes: querying the height of the previously anchored block in the smart contract of the public blockchain. , the block height is the number of blocks of the anchored block; query the latest block height of the private blockchain; generate an anchored hash for the time signature of the unanchored block, and the anchored hash is When the hybrid chain service system is audited, it is used as the audit target; and the smart contract that records the anchor hash and the block height to the public blockchain. The method of mixing a public blockchain with a private blockchain as described in request item 1, including the hybrid chain service system receiving a transaction sent by a user, includes: when the user sends the transaction to the private blockchain , causing the transaction to be included in the block; using the transaction hash to query the private blockchain for the block hash; and generating the time signature for the block hash. The method of mixing a public blockchain with a private blockchain as described in request item 1 also includes the user's real-time audit of the private blockchain, including: after the user confirms the transaction, obtain the block's time signature; Use the public key of the hybrid chain service system to decrypt the timestamp signature to obtain the timestamp signature of the timestamp service organization; use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the timestamp signature. Block hash and timestamp; and compare the block hash after decryption of the timestamp signature with the block hash obtained from the private blockchain. The method of mixing a public blockchain with a private blockchain as described in request item 1 includes the user auditing the anchored block, which includes: the user designates an anchor hash to be issued by the hybrid chain service system. Audit requirements; obtain all time signatures of the anchor block in the hybrid chain service system; calculate the hash of all time signatures to compare with the anchor hash of the public blockchain, and use the hybrid chain service system The public key decrypts all time signatures within the range to obtain the timestamp signature of the timestamp service organization; use the public key of the timestamp service organization to decrypt the timestamp signature to obtain the block hash time stamp; obtain the block hash of the anchor block in the private blockchain; and compare the block hash decrypted by the timestamp signature with the block hash obtained from the private blockchain and check its time order. The method of mixing a public blockchain with a private blockchain as described in claim 9, wherein all time signatures of anchor blocks in the hybrid chain service system are public. A computer-readable medium, used in a computing device or computer, storing instructions to execute the method of mixing a public blockchain with a private blockchain as described in any one of claims 1 to 10.

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