CN113283905A - Data storage and acquisition method and device based on block chain - Google Patents
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Abstract
One or more embodiments of the present specification provide a method and an apparatus for evidence storage and acquisition of data based on a blockchain, which are applied to a blockchain including an evidence storage node device and an acquisition node device; intelligent contracts used for data storage and reading are deployed on the blockchain; the event evidence storing method based on the block chain comprises the following steps: the evidence depositor node equipment sends a first target transaction to the block chain, wherein the first target transaction comprises target event data to be stored; calling the intelligent contract, executing the data storage logic of the intelligent contract statement, and storing the target event data to the intelligent contract; generating a warranty identification image based at least on the identification of the smart contract.
Description
Technical Field
The present specification relates to the field of data processing technologies, and in particular, to a method and an apparatus for storing and acquiring data based on a block chain.
Background
The block chain technology, also called distributed ledger technology, is an emerging technology in which several computing devices participate in "accounting" together, and a complete distributed database is maintained together. The blockchain technology has been widely used in many fields due to its characteristics of decentralization, transparency, participation of each computing device in database records, and rapid data synchronization between computing devices.
Disclosure of Invention
In view of the current situation of the above proposed block chain data processing flow, the present specification provides an event evidence storing method based on a block chain, which is applied to a block chain including evidence storing node devices; intelligent contracts used for data storage and reading are deployed on the blockchain; the method comprises the following steps:
the evidence depositor node equipment sends a first target transaction to the block chain, wherein the first target transaction comprises target event data to be stored;
calling the intelligent contract, executing the data storage logic of the intelligent contract statement, and storing the target event data to the intelligent contract;
generating a warranty identification image based at least on the identification of the smart contract.
In yet another illustrated embodiment, the target data further includes a digital signature made by a target event correlation party for verification of the target event data by an acquirer node device based on the digital signature;
the generating a deposit evidence identification image based on at least the identification of the smart contract comprises:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the identity name of the target event related party.
In yet another illustrative embodiment, the generating a forensic identification image based at least on the identification of the smart contract comprises:
at least coding the identification of the intelligent contract according to a preset coding rule to generate a deposit evidence digital code;
and sequentially generating the color blocks with the preset patterns by the evidence storing digital codes according to the preset mapping relation between the codes and the colors and the preset color block generating sequence.
In yet another illustrative embodiment, the method further comprises:
receiving a mapping code distributed by the intelligent contract for the target event data;
the generating a deposit evidence identification image based on at least the identification of the smart contract comprises:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
In yet another illustrative embodiment, the method further comprises:
sending data acquisition permission transaction of a target user to the blockchain, wherein the data acquisition permission transaction is used for setting the acquisition permission of the target user to the target event data;
and calling the intelligent contract, executing the logic for setting the data acquisition permission of the user, which is declared by the intelligent contract, and setting the permission for acquiring the target event data for the target user.
In yet another illustrative embodiment, the method further comprises:
and receiving a notification message sent by the intelligent contract for the node equipment of the acquirer to acquire the target data.
The present specification also provides an event acquisition method based on a blockchain, which is applied to a blockchain including a depositor node device and an acquirer node device; intelligent contracts of stored target event data are deployed on the blockchain; the method comprises the following steps:
the obtaining party node equipment identifies a certificate storage identification image provided by the certificate storage party node equipment so as to at least obtain an identification of the intelligent contract; wherein the evidence-bearing identification image is generated based at least on an identification of the smart contract;
sending a second target transaction to the blockchain, the second target transaction including an identification of the smart contract;
and calling the intelligent contract, executing the data acquisition logic declared by the intelligent contract, and acquiring the target event data.
In yet another illustrated embodiment, the target event data further includes a digital signature made by the target event-related party;
the method further comprises the following steps:
verifying the target data based on the digital signature.
In yet another illustrative embodiment, the identifying the forensic identification image to obtain at least an identification of the smart contract comprises:
sequentially converting the colors of the color blocks into evidence-storing digital codes according to a preset color block generation sequence and a preset mapping relation between the digital codes and the colors;
and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
In yet another illustrated embodiment, the deposit identification image is generated based at least on the identification of the intelligent contract and the mapping code assigned by the intelligent contract to the target event data;
the identifying the evidence storing identification image to obtain at least an identification of the smart contract comprises: identifying the evidence storage identification image to obtain at least an identification of the intelligent contract and the mapping code;
the second targeted transaction also includes the mapping code.
In yet another illustrated embodiment, the intelligent contract is provided with an acquisition right for the target event data by the acquirer; the executing the data acquisition logic of the intelligent contract statement to acquire the target event data comprises:
acquiring the acquisition authority of the acquirer on the target event data;
and executing the data acquisition logic of the intelligent contract statement based on the acquisition authority of the acquirer on the target data.
Correspondingly, the specification also provides an event evidence storing device based on the block chain, which is applied to the block chain comprising evidence storing side node equipment; intelligent contracts used for data storage and reading are deployed on the blockchain; the device comprises:
the transmitting unit is used for transmitting a first target transaction to the block chain by the evidence storing node equipment, wherein the first target transaction comprises target event data to be stored;
the intelligent contract execution unit is used for calling the intelligent contract, executing the data storage logic declared by the intelligent contract and storing the target event data to the intelligent contract;
and the image generation unit is used for generating a deposit certificate identification image at least based on the identification of the intelligent contract.
In yet another illustrated embodiment, the target data further includes a digital signature made by a target event correlation party for verification of the target event data by an acquirer node device based on the digital signature;
the image generation unit:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the identity name of the target event related party.
In yet another illustrated embodiment, the image generation unit:
at least coding the identification of the intelligent contract according to a preset coding rule to generate a deposit evidence digital code;
and sequentially generating the color blocks with the preset patterns by the evidence storing digital codes according to the preset mapping relation between the codes and the colors and the preset color block generating sequence.
In yet another illustrated embodiment, the apparatus further comprises:
the receiving unit is used for receiving the mapping code distributed by the intelligent contract for the target event data;
the image generation unit:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
In yet another illustrative embodiment, the transmitting unit:
sending data acquisition permission transaction of a target user to the blockchain, wherein the data acquisition permission transaction is used for setting the acquisition permission of the target user to the target event data;
the intelligent contract execution unit calls the intelligent contract, executes the logic for setting the data acquisition permission of the user stated by the intelligent contract, and sets the permission for acquiring the target event data for the target user.
In another illustrated embodiment, the apparatus further comprises a receiving unit: and receiving a notification message sent by the intelligent contract for the node equipment of the acquirer to acquire the target data.
Correspondingly, the present specification also provides an event acquisition apparatus based on a blockchain, which is applied to a blockchain including a node device of a depositor and a node device of an acquirer; intelligent contracts of stored target event data are deployed on the blockchain; the device comprises:
the image identification unit is used for identifying the evidence storage identification image provided by the evidence storage node equipment so as to at least obtain the identification of the intelligent contract; wherein the evidence-bearing identification image is generated based at least on an identification of the smart contract;
a sending unit, configured to send a second target transaction to the blockchain, where the second target transaction includes an identifier of the smart contract;
and the intelligent contract execution unit calls the intelligent contract, executes the data acquisition logic declared by the intelligent contract and acquires the target event data.
In yet another illustrated embodiment, the target event data further includes a digital signature made by the target event-related party;
the device further comprises:
and the data verification unit is used for verifying the target data based on the digital signature.
In a further illustrated embodiment, the image recognition unit:
sequentially converting the colors of the color blocks into evidence-storing digital codes according to a preset color block generation sequence and a preset mapping relation between the digital codes and the colors;
and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
In yet another illustrated embodiment, the deposit identification image is generated based at least on the identification of the intelligent contract and the mapping code assigned by the intelligent contract to the target event data;
the image recognition unit: identifying the evidence storage identification image to obtain at least an identification of the intelligent contract and the mapping code;
the second targeted transaction also includes the mapping code.
In yet another illustrated embodiment, the intelligent contract is provided with an acquisition right for the target event data by the acquirer; the intelligent contract execution unit:
acquiring the acquisition authority of the acquirer on the target event data;
and executing the data acquisition logic of the intelligent contract statement based on the acquisition authority of the acquirer on the target data.
The present specification also provides a computer device comprising: a memory and a processor; the memory having stored thereon a computer program executable by the processor; and when the processor runs the computer program, executing the steps of the event evidence storing method based on the block chain.
The present specification also provides a computer device comprising: a memory and a processor; the memory having stored thereon a computer program executable by the processor; and when the processor runs the computer program, executing the steps of the block chain-based event acquisition method.
The method and the device for data storage and acquisition based on the blockchain are provided by the specification, and an intelligent contract for data storage and reading is deployed on the blockchain, and the intelligent contract can be invoked by a user to store or read data. The distributed database storage mechanism based on the block chain technology is characterized in that target data stored in the intelligent contract by a user of a depositor is recorded in all nodes in a decentralized manner and is commonly maintained by the nodes of all participants; based on a block chain consensus mechanism, data information provided by each evidence storing party user cannot be tampered after being provided, and therefore the effect of storing evidence target data is achieved. The evidence storing party generates an evidence storing identification image at least based on the identification of the intelligent contract, so that the obtaining party can obtain the identification of the intelligent contract by identifying the evidence storing identification image through the image, and then the intelligent contract is called to obtain the target data.
The intelligent contract can finish the storage or acquisition of the target data at any time according to the calling of the user, so that the storage or acquisition efficiency of the target data is greatly improved; and the intelligent contract execution has the advantages of low human intervention and decentralization authority, and the fairness of data storage and behavior acquisition is further improved.
Drawings
Fig. 1 is a flowchart of a data evidence obtaining method based on a blockchain according to an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a certificate store identification image according to another embodiment of the present disclosure;
fig. 3 is a schematic diagram of a data evidence storage device based on a blockchain according to an exemplary embodiment of the present disclosure;
fig. 4 is a schematic diagram of a block chain-based data acquisition apparatus according to an exemplary embodiment of the present disclosure;
fig. 5 is a hardware block diagram for implementing an embodiment of a blockchain-based data certification or verification device provided by an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with one or more embodiments of the present specification. Rather, they are merely examples of apparatus and methods consistent with certain aspects of one or more embodiments of the specification, as detailed in the claims which follow.
It should be noted that: in other embodiments, the steps of the corresponding methods are not necessarily performed in the order shown and described herein. In some other embodiments, the method may include more or fewer steps than those described herein. Moreover, a single step described in this specification may be broken down into multiple steps for description in other embodiments; multiple steps described in this specification may be combined into a single step in other embodiments.
As shown in fig. 1, an exemplary embodiment of the present specification provides a target event evidence storing and acquiring method based on a blockchain, which is applied to a blockchain including a evidence storing node device and an acquiring node device, where an intelligent contract for data storage and reading is deployed on the blockchain.
The block chain described in this embodiment may specifically refer to a P2P network system having a distributed data storage structure, where each node device is implemented by a common knowledge mechanism, data in the block chain is distributed in temporally consecutive blocks (blocks), and a subsequent block includes a data digest of a previous block, and full backup of data of all or part of the node devices is implemented according to different specific common knowledge mechanisms (e.g., POW, POS, DPOS, PBFT, etc.). As is well known to those skilled in the art, since the blockchain system operates under a corresponding consensus mechanism, data that has been included in the blockchain database is difficult to be tampered with by any node device, for example, a blockchain with Pow consensus is adopted, and it is possible to tamper with existing data only by an attack that requires at least 51% of effort on the whole network, so the blockchain system has the characteristics of guaranteeing data security and anti-attack tampering that are compared with other centralized database systems.
In addition, it should be noted that the node device described in this specification may include not only a full node device that backs up the full data of the distributed database with the blockchain, but also a light node device that backs up part of the data of the distributed database with the blockchain, and other terminal devices or clients, which are not limited in this specification.
The intelligent contract deployed on the blockchain is an executable computer program language which is identified and verified by the node equipment of the blockchain so as to be stored in a distributed database of the blockchain; any node device on the blockchain can receive the call of the user of the blockchain to the intelligent contract so as to execute the logic declared by the intelligent contract; the execution result can be stored in a distributed database of the block chain after being identified and verified by the node equipment of the block chain.
In this embodiment, an intelligent contract for data storage and reading is deployed on the blockchain, and a user may complete an operation of storing data in the intelligent contract or reading data stored in the intelligent contract by sending a transaction to an account address or other identifier of the intelligent contract, invoking an interface of the intelligent contract, and performing a corresponding function.
As shown in fig. 1, the data evidence storage method based on a block chain provided in this embodiment includes:
step 102, the depositor node device sends a first target transaction to the blockchain, wherein the first target transaction comprises target event data to be stored.
The transaction (transaction) described in this specification refers to a piece of data that is created by a user through a node device of a blockchain and needs to be finally issued to a distributed database of the blockchain. The transactions in the blockchain are classified into narrow transactions and broad transactions. A narrowly defined transaction refers to a transfer of value issued by a user to a blockchain; for example, in a conventional bitcoin blockchain network, the transaction may be a transfer initiated by the user in the blockchain. While a broad transaction refers to an arbitrary piece of data that a user publishes to a blockchain. The first target transaction described in this embodiment is target event data to be stored, where the target event data may include data describing a process in which all or part of an event occurs, or data describing a feature value of the event, and the like, and may be embodied in various forms such as a contract, a notice, a description, a business profile, an order, and the like, which is not limited in this specification. In order to prevent other nodes in the blockchain from acquiring the original text of the target event data and causing some leakage of privacy information, the target event data may be encrypted, and the first target transaction containing the target event data ciphertext may be sent to the blockchain.
Those skilled in the art will readily understand that the evidence storing party in this embodiment may be one of the target event related party and the target event related party, or may not belong to the target event related party, but serve as a cube or an event evidence storing organization party to execute the event evidence storing method in the embodiments of the present specification.
In still another embodiment, the target event data further includes a digital signature made by the target event related party, such as a digital signature made by a signing party of the contract on the body of the contract, a digital signature made by a notification issuing party on the body of the notification, a digital signature made by a description writing party on the body of the description, a digital signature made by an order ordering party on the content of the order, a digital signature made by a sending party of the e-mail on the content of the body of the e-mail, and so on. Similar to the signature in the actual business, the above-mentioned digital signature may be expressed as the recognition of the target event data by the target event related party, such as the digital signature made by the contract signing party to the electronic contract.
The digital signature is mathematical encryption of a mathematical summary of data contents approved by a signer based on a private key of the signer; by verifying the digital signature, the identity corresponding to the public key of the signer can be verified, and whether the existing data content is consistent with the data content signed by the signer or not can be verified by comparing the mathematical abstract encrypted by the private key with the mathematical abstract obtained by the existing data content, so that whether the existing data content is tampered or not can be known. Therefore, in this embodiment, by verifying the digital signature, the acquirer of the target event data can generally verify whether the signature identity of the target event data and the content of the target event data are tampered with.
After the first target transaction is identified by the device, the first target transaction can be recorded into a distributed database of the blockchain; any node device in the block chain, including a depositor node device, can receive a first target transaction sent by the depositor node device to the block chain, and call the intelligent contract based on the address of the intelligent contract in the first target transaction.
And 104, calling the intelligent contract, executing the data storage logic declared by the intelligent contract, and storing the target event data to the intelligent contract.
The process of storing the target event data into the intelligent contract may also be regarded as a process of updating the intelligent contract in the distributed database of the block chain. In an illustrative embodiment, the storing the target event data to the smart contract comprises:
adding the intelligent contract code storing the target event data into a candidate block by a node with accounting authority in the block chain;
determining consensus accounting nodes satisfying the block chain consensus mechanism from the nodes with accounting authority;
the consensus accounting node broadcasts the candidate blocks to nodes of the block chain;
and after the candidate block passes verification approval of the nodes with the preset number of the block chains, the candidate block is regarded as the latest block and added into a distributed database of the block chains.
In the above embodiments, the node having the accounting authority refers to a node having an authority to generate candidate blocks, and may include the node device of the depositor, the node device of the acquirer, and other node devices in the block chain described in this specification. According to the consensus mechanism of the block chain, a consensus accounting node can be determined from the nodes having accounting authority for the candidate block, and the consensus mechanism can include a workload attestation mechanism (PoW), a rights attestation mechanism (PoS), a stock authorization attestation mechanism (DPoS), a PBFT algorithm mechanism, or the like.
Based on the above specific process, the target event data is stored in the intelligent contract, that is, in the distributed database of the block chain, thereby completing the block chain verification of the target event data.
When the target event data included in the first target transaction is in an encrypted ciphertext state, the intelligent contract can decrypt the ciphertext and verify the original text of the target event data in the intelligent contract; the ciphertext of the target event data may also be directly stored, and is not limited in this specification.
In this embodiment, in order to facilitate other users to obtain the certified target event data, the node device on the depositor may further execute step 106: and generating a evidence storage identification image at least based on the identification of the intelligent contract so as to enable other users to acquire the identification of the intelligent contract based on an image recognition mode, thereby calling the intelligent contract in the block chain, executing the data acquisition logic declared by the intelligent contract and acquiring the target event data. The identification of the intelligent contract can generally comprise an address of the intelligent contract, or an account name of the intelligent contract, or a digital abstract value of the intelligent contract, and the like, which can uniquely identify the identification of the intelligent contract.
In a further illustrated embodiment, when the target data further includes a digital signature made by the target event-related party, in order to facilitate the node device of the acquirer for the target event data to verify the target event data based on the digital signature after acquiring the target event data, for example, to verify the identity of the target event-related party, or to verify whether the target event data certified on the blockchain is consistent with the target event data signed by the digital signature of the target event-related party, the certification identification image may be generated based on the identification of the smart contract and the identity name of the target event-related party.
The identification of the intelligent contract or the identity name of the target event related party can be conveniently obtained in a digital imaging mode such as a two-dimensional code or a bar code by representing the identification of the intelligent contract or the identity name of the target event related party so as to be used for obtaining or/and verifying target event data; however, the evidence identification image in the form of the two-dimensional code or the bar code cannot intuitively represent the data information represented by the image.
Fig. 2 illustrates a deposit certificate identification image provided in an exemplary embodiment of this specification, where the deposit certificate identification image is a picture (including color) generated at least based on an identifier of the intelligent contract, for example, at least the identifier of the intelligent contract is encoded according to a preset encoding rule to generate a deposit certificate digital code, and the deposit certificate digital code is sequentially generated into color blocks of corresponding colors according to a mapping relationship between the preset code and the color. Alternatively, the color blocks may be patterns with fixed patterns, such as flowers shown in fig. 2, and color pictures may be generated according to the order of the color blocks (e.g., the order of petals 1 to 8 shown in fig. 2).
When the certificate storage identification image further comprises the identification name information of the target event related party, the identification name of the target event related party can be presented together with the color image in a handwritten signature mode, for example, a handwritten signature "stand" (reference numeral 9) shown in fig. 2, compared with the certificate storage identification image presented in a two-dimensional code or bar code mode, the color image shown in fig. 2 and the certificate storage identification image presented in a handwritten signature mode are provided, and an acquiring party user can directly acquire the identification name of the target event related party to be acquired or verified by observing the handwritten signature, so that better intuitiveness is achieved, and the user name of the event related party can be acquired by identifying the handwritten signature in an image identification mode; the colored pattern shown in fig. 2 also has better aesthetic properties than the image pattern of a bar code or a two-dimensional code.
The intelligent contract for data storage and reading described in the above embodiment may be certified for a specified target business event, or for a plurality of target business events; the evidence may be deposited for a plurality of pieces of target event data of one target event, or for a plurality of pieces of target event data of a plurality of target events. When the intelligent contract is used for storing a plurality of target business events or a plurality of pieces of target event data of one target business event, the intelligent contract can also allocate corresponding mapping codes to the target event data, so that the target event data acquirer can acquire the corresponding target event data based on the mapping codes. The mapping code may include a serial number assigned to the target event data by the intelligent contract, an identification number assigned to a name of a party associated with the target event data by the intelligent contract, and the like. Accordingly, the above-mentioned generating a deposit certificate identification image based on at least the identification of the intelligent contract also includes: and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
In order to ensure that the target event data cannot be obtained by invoking the intelligent contract by any blockchain user, and ensure the privacy and security of the target event data, the intelligent contract may further set, for different blockchain users, acquisition permissions for the target event data, where the acquisition permissions may include: any target event data cannot be acquired, a preset part of target event data can be acquired, all the target event data can be acquired, and the like, and the setting can be carried out according to the specific scene of the intelligent contract application. The setting of the acquisition authority of the target event data can be set by a deployment party of the intelligent contract before the deployment and the chain of the intelligent contract, can also be set by an administrator user with authority setting after the intelligent contract is deployed, and can also be set by a evidence storing party of the target event according to the specific target event.
In an illustrated embodiment, the process of setting the data acquisition right of the target user by the depositor of the target event includes: any node device (including the evidence depositor node device) in the blockchain receives data acquisition permission transaction of a target user sent to the blockchain by the evidence depositor node device, wherein the data acquisition permission transaction is used for setting the acquisition permission of the target user on the target event data; and calling the intelligent contract, executing the logic for setting the data acquisition permission of the user, which is declared by the intelligent contract, and setting the permission for acquiring the target event data for the target user.
In order to ensure that the node device of the depositor monitors the acquisition of the target event data to ensure the security of the data, including timely acquiring the user of the acquirer who acquires the target event data from the intelligent contract, in a further illustrated embodiment, the intelligent contract further declares acquisition message notification logic for sending a notification message about the acquisition of the target event data by the node device of the acquirer to the depositor of the target event data; accordingly, the depositor node device may receive a notification message sent by the smart contract about the acquirer node device acquiring the target event data.
One or more embodiments of the foregoing description describe one or more event evidence storing methods based on a blockchain, and after a node device of an evidence storing party completes storing evidence of target event data, the evidence storing party may send the evidence storing identification image to any block link node device that needs to acquire or verify the target event data, so that the node device serves as an acquiring party node device to acquire the target event data. As shown in fig. 1, the process of acquiring the target event data may include:
step 108, the obtaining party node equipment identifies a certificate storage identification image provided by the certificate storage party node equipment so as to obtain at least an identification of the intelligent contract; wherein the evidence-bearing identification image is generated based at least on an identification of the smart contract;
step 110, sending a second target transaction to the blockchain, wherein the second target transaction comprises the identification of the intelligent contract;
and step 108, calling the intelligent contract, executing the data acquisition logic declared by the intelligent contract, and acquiring the target event data.
As described above, the target event data may include data describing a process in which all or part of the target event occurs, or data describing a characteristic value of the target event, and the like, which may be embodied in various forms such as a contract, a notice, a specification, a business profile, an order, and the like, and is not limited in this specification.
In still another embodiment, the target event data further includes a digital signature made by the target event related party, such as a digital signature made by a signing party of the contract on the body of the contract, a digital signature made by a notification issuing party on the body of the notification, a digital signature made by a description writing party on the body of the description, a digital signature made by an order ordering party on the content of the order, a digital signature made by a sending party of the e-mail on the content of the body of the e-mail, and so on. Similar to the signature in the actual business, the above-mentioned digital signature may be expressed as the recognition of the target event data by the target event related party, such as the digital signature made by the contract signing party to the electronic contract.
Correspondingly, the above event acquisition method based on the block chain further includes: verifying the target data based on the digital signature. The digital signature is mathematical encryption of a mathematical summary of data contents approved by a signer based on a private key of the signer; by verifying the digital signature, the public key of the signer can be obtained, and then the public key is provided to the identity authentication mechanism for identity authentication, so that the identity corresponding to the public key of the signer can be obtained, and whether the existing data content is consistent with the data content signed by the signer or not can be verified by comparing the mathematical abstract encrypted by the private key with the mathematical abstract obtained by the existing data content, so that whether the existing data content is tampered or not can be obtained. Therefore, in this embodiment, by verifying the digital signature, the acquirer of the target event data can generally verify whether the signature identity of the target event data and the content of the target event data are tampered with.
In a further illustrated embodiment, when the target data further includes a digital signature made by the target event-related party, in order to facilitate the node device of the acquirer for the target event data to verify the target event data based on the digital signature after acquiring the target event data, for example, to verify the identity of the target event-related party, or to verify whether the target event data certified on the blockchain is consistent with the target event data signed by the digital signature of the target event-related party, the certification identification image may be generated based on the identification of the smart contract and the identity name of the target event-related party.
The identification of the intelligent contract or the identity name of the target event related party can be conveniently obtained in a digital imaging mode such as a two-dimensional code or a bar code by representing the identification of the intelligent contract or the identity name of the target event related party so as to be used for obtaining or/and verifying target event data; however, the evidence identification image in the form of the two-dimensional code or the bar code cannot intuitively represent the data information represented by the image.
Fig. 2 illustrates a deposit certificate identification image provided in an exemplary embodiment of this specification, where the deposit certificate identification image is a picture (including color) generated at least based on an identifier of the intelligent contract, for example, at least the identifier of the intelligent contract is encoded according to a preset encoding rule to generate a deposit certificate digital code, and the deposit certificate digital code is sequentially generated into color blocks of corresponding colors according to a mapping relationship between the preset code and the color. Alternatively, the color blocks may be patterns with fixed patterns, such as flowers shown in fig. 2, and color pictures may be generated according to the order of the color blocks (e.g., the order of petals 1 to 8 shown in fig. 2). The acquiring party can scan the color picture through an image recognition terminal, and recognize the colors of the color blocks with the preset patterns according to the generation sequence of the color blocks (such as the sequence of petals 1-8 shown in figure 2); decoding the color of the color block according to a preset mapping relation between the digital code and the color so as to obtain a digital code for storing the certificate; and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
When the certificate storage identification image further comprises the identification name information of the target event related party, the identification name of the target event related party can be presented together with the color image in a handwritten signature mode, for example, a handwritten signature "stand" (reference numeral 9) shown in fig. 2, compared with the certificate storage identification image presented in a two-dimensional code or bar code mode, the color image shown in fig. 2 and the certificate storage identification image presented in a handwritten signature mode are provided, and an acquiring party user can directly acquire the identification name of the target event related party to be acquired or verified by observing the handwritten signature, so that better intuitiveness is achieved, and the user name of the event related party can be acquired by identifying the handwritten signature in an image identification mode; the colored pattern shown in fig. 2 also has better aesthetic properties than the image pattern of a bar code or a two-dimensional code.
The intelligent contract for data storage and reading described in the above embodiment may be certified for a specified target business event, or for a plurality of target business events; the evidence may be deposited for a plurality of pieces of target event data of one target event, or for a plurality of pieces of target event data of a plurality of target events. When the intelligent contract is used for storing a plurality of target business events or a plurality of pieces of target event data of one target business event, the intelligent contract can also allocate corresponding mapping codes to the target event data, so that the target event data acquirer can acquire the corresponding target event data based on the mapping codes. The mapping code may include a serial number assigned to the target event data by the intelligent contract, an identification number assigned to a name of a party associated with the target event data by the intelligent contract, and the like. Accordingly, the above-mentioned generating a deposit certificate identification image based on at least the identification of the intelligent contract also includes: and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code. After the obtaining party node equipment carries out evidence storage identification image recognition, the identification of the intelligent contract and the mapping code can be obtained, the identification of the intelligent contract and the mapping code are placed in a second target transaction together to call the intelligent contract, and corresponding target event data are obtained based on the mapping code.
In order to ensure that the target event data cannot be obtained by invoking the intelligent contract by any blockchain user, and ensure the privacy and security of the target event data, the intelligent contract may further set, for different blockchain users, acquisition permissions for the target event data, where the acquisition permissions may include: any target event data cannot be acquired, a preset part of target event data can be acquired, all the target event data can be acquired, and the like, and the setting can be carried out according to the specific scene of the intelligent contract application. The setting of the acquisition authority of the target event data can be set by a deployment party of the intelligent contract before the deployment and the chain of the intelligent contract, can also be set by an administrator user with authority setting after the intelligent contract is deployed, and can also be set by a evidence storing party of the target event according to the specific target event.
Thus, the executing the data acquisition logic of the intelligent contract statement to acquire the target data comprises: acquiring the acquisition authority of the acquirer on the target data; and executing the data acquisition logic of the intelligent contract statement based on the acquisition authority of the acquirer on the target data. Specifically, the setting of the data acquisition permission of the acquiring party can be realized by setting a user white list, a user black list, a user permission setting table and other technical means, and details are not repeated here.
Corresponding to the above flow implementation, embodiments of the present specification further provide an event evidence storage device based on a blockchain and an event acquisition based on the blockchain. The apparatus may be implemented by software, or by hardware, or by a combination of hardware and software. Taking a software implementation as an example, the logical device is formed by reading a corresponding computer program instruction into a memory for running through a Central Processing Unit (CPU) of the device. In terms of hardware, in addition to the CPU, the memory, and the storage shown in fig. 5, the device in which the apparatus for implementing the cyber risk service is located generally includes other hardware such as a chip for transmitting and receiving wireless signals and/or other hardware such as a board card for implementing a network communication function.
As shown in fig. 3, the present specification further provides an event evidence storing apparatus 30 based on a blockchain, which is applied to a blockchain including evidence storing node devices; intelligent contracts used for data storage and reading are deployed on the blockchain; the device 30 comprises:
a sending unit 302, where the depositor node device sends a first target transaction to the blockchain, where the first target transaction includes target event data to be stored;
the intelligent contract execution unit 304 is used for calling the intelligent contract, executing the data storage logic stated by the intelligent contract and storing the target event data into the intelligent contract;
an image generation unit 306 generates a warranty identification image based on at least the identification of the smart contract.
In yet another illustrated embodiment, the target event data further includes a digital signature made by a target event correlation party for verification of the target event data by the acquirer node device based on the digital signature;
the image generation unit 306:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the identity name of the target event related party.
In yet another illustrated embodiment, the image generation unit 306:
at least coding the identification of the intelligent contract according to a preset coding rule to generate a deposit evidence digital code;
and sequentially generating the color blocks with the preset patterns by the evidence storing digital codes according to the preset mapping relation between the codes and the colors and the preset color block generating sequence.
In yet another illustrated embodiment, the apparatus 30 further comprises:
a receiving unit 308, which receives the mapping code allocated by the intelligent contract for the target event data;
the image generation unit 306:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
In yet another illustrated embodiment, the sending unit 302:
sending data acquisition permission transaction of a target user to the blockchain, wherein the data acquisition permission transaction is used for setting the acquisition permission of the target user to the target event data;
the intelligent contract execution unit 304 invokes the intelligent contract, executes the logic for setting the data acquisition permission of the user stated by the intelligent contract, and sets the permission for acquiring the target event data for the target user.
In another illustrated embodiment, the apparatus 30 further includes a receiving unit 310: and receiving a notification message sent by the intelligent contract for the node equipment of the acquirer to acquire the target data.
Correspondingly, as shown in fig. 4, the present specification further provides an event acquiring apparatus 40 based on a blockchain, which is applied to a blockchain including a depositor node device and an acquirer node device; intelligent contracts of stored target event data are deployed on the blockchain; the device 40 comprises:
an image recognition unit 402, which recognizes a certificate storage identification image provided by the certificate storage node device to obtain at least an identification of the intelligent contract; wherein the evidence-bearing identification image is generated based at least on an identification of the smart contract;
a sending unit 404, configured to send a second target transaction to the blockchain, where the second target transaction includes an identifier of the smart contract;
and the intelligent contract execution unit 406 is used for calling the intelligent contract, executing the data acquisition logic declared by the intelligent contract and acquiring the target event data.
In yet another illustrated embodiment, the target event data further includes a digital signature made by the target event-related party;
the apparatus 40 further comprises:
a data verification unit 408 for verifying the target data based on the digital signature.
In yet another illustrated embodiment, the image recognition unit 402:
sequentially converting the colors of the color blocks into evidence-storing digital codes according to a preset color block generation sequence and a preset mapping relation between the digital codes and the colors;
and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
In yet another illustrated embodiment, the deposit identification image is generated based at least on the identification of the intelligent contract and the mapping code assigned by the intelligent contract to the target event data;
the image recognition unit 402: identifying the evidence storage identification image to obtain at least an identification of the intelligent contract and the mapping code;
the second targeted transaction also includes the mapping code.
In yet another illustrated embodiment, the intelligent contract is provided with an acquisition right for the target event data by the acquirer; the smart contract execution unit 404:
acquiring the acquisition authority of the acquirer on the target event data;
and executing the data acquisition logic of the intelligent contract statement based on the acquisition authority of the acquirer on the target data.
The implementation processes of the functions and actions of each unit in the device are specifically described in the implementation processes of the corresponding steps in the method, and related parts are described in the partial description of the method embodiment, which is not described herein again.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the units or modules can be selected according to actual needs to achieve the purpose of the solution in the specification. One of ordinary skill in the art can understand and implement it without inventive effort.
The apparatuses, units and modules illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. A typical implementation device is a computer, which may take the form of a personal computer, laptop computer, cellular telephone, camera phone, smart phone, personal digital assistant, media player, navigation device, email messaging device, game console, tablet computer, wearable device, or a combination of any of these devices.
Corresponding to the method embodiment, the embodiment of the present specification further provides a computer device, which includes a memory and a processor. Wherein the memory has stored thereon a computer program executable by the processor; the processor, when executing the stored computer program, performs the steps of the blockchain-based event credentialing method of the embodiments of the present specification. For a detailed description of each step of the event evidence storage method based on the blockchain, please refer to the previous contents, which is not repeated.
Corresponding to the method embodiment, the embodiment of the present specification further provides a computer device, which includes a memory and a processor. Wherein the memory has stored thereon a computer program executable by the processor; the processor, when executing the stored computer program, performs the steps of the blockchain-based event acquisition method in the embodiments of the present specification. For a detailed description of each step of the blockchain-based event acquisition method, please refer to the previous contents, which are not repeated.
The above description is only a preferred embodiment of the present disclosure, and should not be taken as limiting the present disclosure, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data.
Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
Claims (20)
1. An event evidence storing method based on a block chain is applied to node equipment in the block chain; intelligent contracts used for data storage and reading are deployed on the blockchain; the method comprises the following steps:
receiving a first target transaction sent by a depositor, wherein the first target transaction comprises target event data to be stored;
invoking the intelligent contract in response to the first target transaction, executing the intelligent contract declared data storage logic, and storing the target event data to the intelligent contract;
and generating a deposit certificate identification image corresponding to the target event data at least based on the identification of the intelligent contract, and providing the deposit certificate identification image to an acquirer corresponding to the target event data.
2. The method of claim 1, the generating a forensic identification image based at least on an identification of the smart contract, comprising:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the identity name of the target event related party.
3. The method according to claim 1 or 2, wherein the deposit identification image comprises a pattern of a plurality of color patches having a preset pattern.
4. The method of claim 3, the generating a forensic identification image based at least on the identification of the smart contract, comprising:
at least coding the identification of the intelligent contract according to a preset coding rule to generate a deposit evidence digital code;
and according to a preset mapping relation between the codes and colors, the codes in the evidence storing digital codes are sequentially changed into color blocks with corresponding colors, and the generated color blocks are further generated into patterns with the preset patterns according to a preset color block generation sequence.
5. The method of claim 1 or 2, further comprising:
receiving a mapping code distributed by the intelligent contract for the target event data;
the generating a deposit evidence identification image based on at least the identification of the smart contract comprises:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
6. An event acquisition method based on a block chain is applied to node equipment in the block chain; intelligent contracts of stored target event data are deployed on the blockchain; the method comprises the following steps:
receiving a second target transaction sent by an acquirer, wherein the second target transaction comprises an identifier of the intelligent contract; the identification of the intelligent contract is acquired by the acquirer by identifying a evidence storage identification image which is provided by the evidence storage node equipment and corresponds to the target event data; the evidence storing identification image is generated at least based on the identification of the intelligent contract;
and responding to the second target transaction, calling the intelligent contract, executing the data acquisition logic declared by the intelligent contract, and acquiring the target event data.
7. The method of claim 6, wherein the witness mark image comprises a pattern of a plurality of color patches having a predetermined pattern.
8. The method of claim 7, the acquirer identifying the evidence storage identification image corresponding to the target event data provided by the evidence storage node device by:
identifying color blocks in the pattern with the preset pattern according to a preset color block generation sequence, and further sequentially converting the colors of the identified color blocks into codes in the digital code for evidence storage according to a preset mapping relation between the digital code and the colors;
and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
9. The method of claim 6, the deposit identification image generated based at least on an identification of the intelligent contract and a mapping code assigned by the intelligent contract to the target event data;
the acquirer identifies the evidence storage identification image corresponding to the target event data, which is provided by the evidence storage node equipment, through the following steps:
identifying the evidence storage identification image to obtain at least an identification of the intelligent contract and the mapping code;
the second targeted transaction also includes the mapping code.
10. An event evidence storing device based on a block chain is applied to node equipment in the block chain; intelligent contracts used for data storage and reading are deployed on the blockchain; the device comprises:
the system comprises a sending unit, a receiving unit and a processing unit, wherein the sending unit is used for receiving a first target transaction sent by a depositor, and the first target transaction comprises target event data to be stored;
the intelligent contract execution unit is used for responding to the first target transaction, calling the intelligent contract, executing the data storage logic stated by the intelligent contract and storing the target event data into the intelligent contract;
and the image generation unit is used for generating a deposit certificate identification image corresponding to the target event data at least based on the identification of the intelligent contract and providing the deposit certificate identification image to an acquirer corresponding to the target event data.
11. The apparatus of claim 10, the image generation unit to:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the identity name of the target event related party.
12. The apparatus according to claim 10 or 11, wherein the deposit identification image comprises a pattern composed of a plurality of color patches having a preset pattern.
13. The apparatus of claim 12, the image generation unit to:
at least coding the identification of the intelligent contract according to a preset coding rule to generate a deposit evidence digital code;
and according to a preset mapping relation between the codes and colors, the codes in the evidence storing digital codes are sequentially changed into color blocks with corresponding colors, and the generated color blocks are further generated into patterns with the preset patterns according to a preset color block generation sequence.
14. The apparatus of claim 10 or 11, further comprising:
the receiving unit is used for receiving the mapping code distributed by the intelligent contract for the target event data;
the image generation unit:
and generating a deposit certificate identification image at least based on the identification of the intelligent contract and the mapping code.
15. An event acquisition device based on a block chain is applied to node equipment in the block chain; intelligent contracts of stored target event data are deployed on the blockchain; the device comprises:
the sending unit is used for receiving a second target transaction sent by the acquirer, wherein the second target transaction comprises the identification of the intelligent contract; the identification of the intelligent contract is acquired by the acquirer by identifying a evidence storage identification image which is provided by the evidence storage node equipment and corresponds to the target event data; the evidence storing identification image is generated at least based on the identification of the intelligent contract;
and the intelligent contract execution unit is used for responding to the second target transaction, calling the intelligent contract, executing the data acquisition logic stated by the intelligent contract and acquiring the target event data.
16. The apparatus of claim 15, the witness mark image comprising a pattern of a plurality of color patches having a preset pattern.
17. The apparatus of claim 16, the acquirer identifying the evidence storage identification image corresponding to the target event data provided by the evidence storage node device by:
identifying color blocks in the pattern with the preset pattern according to a preset color block generation sequence, and further sequentially converting the colors of the identified color blocks into codes in the digital code for evidence storage according to a preset mapping relation between the digital code and the colors;
and decoding the evidence storing digital code according to a preset decoding rule so as to at least obtain the identification of the intelligent contract.
18. The apparatus of claim 15, the deposit identification image generated based at least on an identification of the intelligent contract and a mapping code assigned by the intelligent contract to the target event data;
the acquirer identifies the evidence storage identification image corresponding to the target event data, which is provided by the evidence storage node equipment, through the following steps:
identifying the evidence storage identification image to obtain at least an identification of the intelligent contract and the mapping code;
the second targeted transaction also includes the mapping code.
19. A computer device, comprising: a memory and a processor; the memory having stored thereon a computer program executable by the processor; the processor, when executing the computer program, performs the method of any of claims 1 to 5.
20. A computer device, comprising: a memory and a processor; the memory having stored thereon a computer program executable by the processor; the processor, when executing the computer program, performs the method of any of claims 6 to 9.
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| CN109615383A (en) | 2019-04-12 |
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| WO2020082894A1 (en) | 2020-04-30 |
| TW202016853A (en) | 2020-05-01 |
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