WO2021258907A1

WO2021258907A1 - Transaction method based on blockchain network, node, and medium

Info

Publication number: WO2021258907A1
Application number: PCT/CN2021/093816
Authority: WO
Inventors: 宋春霖; 朱皞罡
Original assignee: 京东方科技集团股份有限公司
Priority date: 2020-06-22
Filing date: 2021-05-14
Publication date: 2021-12-30
Also published as: CN113837875A

Abstract

A transaction method based on a blockchain network, comprising: in response to a transaction request of a buyer node, sending a negotiation request to a smart contract node (S1); by means of a seller transaction public key in a negotiation protocol, encrypting a transaction product to generate a first encrypted transaction product, and sending the first encrypted transaction product and a transaction product identifier to a digital watermark node (S2); and, in response to a third encrypted transaction product sent by the digital watermark node, by means of the seller transaction public key, decrypting the third encrypted transaction product to generate a fourth encrypted transaction product, and sending the fourth encrypted transaction product to the buyer node (S3). Also provided are a seller node, a digital watermark node, a smart contract node, and a computer readable medium.

Description

Transaction methods, nodes and media based on blockchain network

Technical field

The present disclosure relates to the field of communication technology, and in particular to a transaction method based on a blockchain network, a seller node, a digital watermark node, a smart contract node, and a computer-readable medium.

Background technique

With the rapid development of intelligence, networking and communication technology, related digital multimedia products have penetrated into all aspects of social life. The development of new technologies has brought new development opportunities to the digital publishing and digital copyright industries, and the proportion of digital publishing in the entire publishing industry has also grown rapidly. The release and distribution of digital multimedia content on the Internet is much more convenient than before, and most of the content does not have any copyright protection. A dishonest owner can easily copy and distribute digital multimedia content without degrading any perceived quality. In this case, the new form of digital publishing has brought tremendous pressure and challenges to digital copyright protection.

Digital Rights Management (Digital Rights Management, DRM for short) is the main method of online copyright protection for digital works. The Association of American Publishers defines it as: the technology, tools and process of protecting intellectual property rights in the process of digital content transactions. As a kind of digital rights management technology, the watermark protocol uses information security technology to ensure the normal use of digital multimedia content (such as digital images, audio, video, etc.) by legal and authorized users. The watermark protocol protects the entire circulation process of digital content from production to distribution, sales to use, and plays a very important role in usage tracking and copyright infringement certification. Specifically, it focuses on the various processes of describing, identifying, trading, protecting, monitoring and tracking the use of various forms of digital assets.

In order to solve the trust problem in the digital product transaction process, the current watermarking agreement mostly uses a fully trusted third party or a semi-trusted third party to participate in the construction of a buyer-seller interaction structure. In the transaction process with the trust system as the design framework, the lack of trust caused by privacy leakage, IT security and performance risks will bring greater hidden dangers. Once the third party is restricted or the trust relationship has problems, the buyer and seller will perform complex For safe operation, the transaction cannot continue. In addition, it is necessary to fully trust the third-party watermarking protocol, which cannot effectively defend against collusion attacks. At the same time, due to the need for trust verification, the efficiency of the watermarking protocol will also be affected.

Summary of the invention

The present disclosure aims to solve at least one of the technical problems existing in the prior art, and proposes a transaction method based on a blockchain network, a seller node, a digital watermark node, and a computer-readable medium.

To achieve the foregoing objectives, in the first aspect, embodiments of the present disclosure provide a transaction method based on a blockchain network, including:

In response to the transaction request of the buyer node, a negotiation request is sent to the smart contract node for the smart contract node to generate a buyer transaction key pair and a seller transaction key pair; wherein, the transaction request includes: buyer node identification and transaction product ID, the negotiation request includes: its own seller node ID, the buyer node ID, and the transaction product ID;

The transaction product is encrypted by the seller’s transaction public key in the negotiation agreement to generate a first encrypted transaction product, and the first encrypted transaction product and the transaction product identifier are sent to the digital watermarking node for the digital watermarking node Encrypting the first encrypted transaction product by using the buyer's transaction public key to generate a second encrypted transaction product;

In response to the third encrypted transaction product sent by the digital watermark node, decrypt the third encrypted transaction product by the seller's transaction private key, generate a fourth encrypted transaction product, and send the fourth encrypted transaction product To the buyer node.

In some embodiments, before the step of using the seller's transaction public key to encrypt the transaction product, the method further includes:

In response to the smart contract node identification sent by the smart contract node, the digital signature of the smart contract node identification is verified, and after the verification is passed, the step of using the seller's transaction public key to encrypt the transaction product is executed.

In some embodiments, the method further includes:

In response to the product to be verified whose legality is unknown, an identification request is sent to the digital watermark node for the digital watermark node to extract the watermark information in the product to be verified, search in the database according to the watermark information, and Send a verification request to the smart contract node, where the identification request includes: the product to be verified.

In the second aspect, the embodiments of the present disclosure also provide a transaction method based on a blockchain network, including:

Receive the seller node ID, buyer node ID, seller transaction public key, and buyer transaction public key sent by the smart contract node;

In response to the first encrypted transaction product and transaction product identifier sent by the seller node, a digital watermark is generated according to the seller node identifier, the buyer node identifier, and the transaction product identifier, wherein the first encrypted transaction product is the Generated after the seller node encrypts the transaction product through the seller's transaction public key;

The digital watermark is encrypted by the seller transaction public key and the buyer transaction public key to generate an encrypted digital watermark, and the first encrypted transaction product is encrypted by the buyer transaction public key to generate a second encryption Trading products;

Insert the encrypted digital watermark into the second encrypted transaction product to generate a third encrypted transaction product, and send the third encrypted transaction product to the seller node, so that the seller node can exchange information with the seller’s transaction private key. The third encrypted transaction product is decrypted, a fourth encrypted transaction product is generated, and the fourth encrypted transaction product is sent to the buyer node.

In some embodiments, the step of generating a digital watermark according to the seller node identifier, the buyer node identifier, and the product identifier specifically includes:

Generating a first sub-watermark according to the seller node identifier and the buyer node identifier, and generating a second sub-watermark according to the transaction product identifier and timestamp information;

The digital watermark is generated according to the first sub-watermark, the second sub-watermark, and a random value.

In some embodiments, the method further includes:

Encrypt the transaction product identifier, the seller’s transaction public key, the buyer’s transaction public key, and the third encrypted transaction product with its own digital watermark node public key to generate a watermark protocol, and send the watermark protocol To the smart contract node for the smart contract node to write the watermark protocol into the blockchain network.

In some embodiments, the method further includes:

The product identification, the seller's transaction public key, the buyer's transaction public key, and the third encrypted transaction product are stored in a database.

In some embodiments, the method further includes:

Receiving an identification request sent by the seller node, where the identification request includes: a product to be verified;

Extract the watermark information in the product to be verified, search in the database based on the watermark information, and send a verification request to the smart contract node for the smart contract node to verify the legality of the product to be verified The verification request includes: a search result and a product identification to be verified of the product to be verified, and the search result records the retrieved transaction product identification, the seller's transaction public key, the buyer's transaction public key, and the third encryption Trading products.

In the third aspect, the embodiments of the present disclosure also provide a transaction method based on a blockchain network, including:

In response to the negotiation request sent by the seller node, a negotiation agreement corresponding to the transaction product is generated; wherein the negotiation request includes: a seller node identifier, a buyer node identifier, and a transaction product identifier of the transaction product;

Send the seller node ID, the buyer node ID, the seller transaction public key and the buyer transaction public key in the negotiation agreement to the digital watermark node; send the buyer transaction private key in the negotiation agreement to the buyer node; send the negotiation The seller transaction public key and seller transaction private key in the agreement are sent to the seller node.

In some embodiments, the method further includes:

In response to the verification request sent by the digital watermark node, the legitimacy of the product to be verified is verified, wherein the verification request includes: a search result and the product identification of the product to be verified, and the search result records The transaction product identification, the seller’s transaction public key, the buyer’s transaction public key and the third encrypted transaction product.

In some embodiments, the method further includes:

Sign the seller node identifier, the buyer node identifier, the transaction product identifier, and the smart contract node identifier through its own smart contract section public key, add it to the negotiation agreement, and write the negotiation agreement Blockchain network.

In a fourth aspect, the embodiments of the present disclosure also provide a seller node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method including sending a negotiation request to the smart contract node as described in any of the foregoing embodiments.

In a fifth aspect, the embodiments of the present disclosure also provide a computer-readable medium on which a computer program is stored, wherein the program is executed by a processor to implement the smart contract as described in any of the above embodiments. Steps in the method for a node to send a negotiation request.

In the sixth aspect, the embodiments of the present disclosure also provide a digital watermark node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, so that the one or more processors implement any of the above-mentioned A method for generating a digital watermark from the node identifier and the transaction product identifier.

In a seventh aspect, the embodiments of the present disclosure also provide a computer-readable medium on which a computer program is stored, wherein the program is executed by a processor to realize the The steps in the method for generating a digital watermark with the seller node identifier, the buyer node identifier, and the transaction product identifier.

In an eighth aspect, the embodiments of the present disclosure also provide a smart contract node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors can implement any one of the above-mentioned embodiments including the seller in the negotiation agreement The method for sending the transaction public key and the seller's transaction private key to the seller node.

In a ninth aspect, the embodiments of the present disclosure also provide a computer-readable medium on which a computer program is stored, wherein the program is executed by a processor to realize the The steps in the method in which the seller transaction public key and the seller transaction private key in the negotiation agreement are sent to the seller node.

Description of the drawings

FIG. 1 is a flowchart of a transaction method based on a blockchain network provided by an embodiment of the disclosure.

FIG. 2 is a flowchart of another transaction method based on a blockchain network provided by an embodiment of the disclosure.

FIG. 3 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the present disclosure.

FIG. 4 is a flowchart of a specific implementation method of step S7 in an embodiment of the disclosure.

Fig. 5 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the present disclosure.

FIG. 6 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure.

FIG. 7 is a signaling diagram of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure.

FIG. 8 is a signaling diagram of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure.

detailed description

In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the following describes the blockchain network-based transaction methods, seller nodes, digital watermark nodes, smart contract nodes, and computer-readable media provided by the present disclosure in conjunction with the accompanying drawings. A detailed description.

Hereinafter, example embodiments will be described more fully with reference to the accompanying drawings, but the example embodiments may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, the purpose of providing these embodiments is to make the present disclosure thorough and complete, and to enable those skilled in the art to fully understand the scope of the present disclosure.

The terms used herein are only used to describe specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "a" and "the" are also intended to include the plural forms, unless the context clearly dictates otherwise. It will also be understood that when the terms "comprise" and/or "made of" are used in this specification, it specifies the presence of the described features, wholes, steps, operations, elements and/or components, but does not exclude the presence or Add one or more other features, wholes, steps, operations, elements, components, and/or groups thereof.

It will be understood that although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, without departing from the teachings of the present disclosure, the first element, the first component, or the first module discussed below may be referred to as the second element, the second component, or the second module.

Unless otherwise defined, the meanings of all terms (including technical and scientific terms) used herein are the same as those commonly understood by those of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the related technology and the present disclosure, and will not be interpreted as having idealized or excessive formal meanings, Unless this article specifically defines it as such.

The blockchain network-based transaction method, seller node, digital watermark node, smart contract node, and computer-readable medium provided by the present disclosure can be used for blockchain-based network through smart contract nodes and digital watermark nodes and other trustless third parties. The three parties establish a watermark agreement to meet the needs of both parties in the transaction and solve the corresponding trust issues.

The watermark protocol based on the blockchain network involved in this transaction method realizes the secure transmission of digital products between untrusted parties. Among them, in the blockchain network, each new transaction is announced to a node composed of In a distributed network, if all nodes in it are approved, the transaction is added to a block; the timestamp, the hash value of the previous block and the transaction record are used as the main elements of each block, after which, Different blocks are linked together to create an immutable and appendable chain; a copy of the block chain is maintained by each participating node.

Therefore, the blockchain network has the following characteristics: Decentralization: The blockchain is a distributed database without a central node, including an ordered list of records, these records are linked together by the blockchain, and the blockchain network is maintained With a growing list of different records, a block can be defined as a single component that contains the same information related to a specific transaction; immutable: in each blockchain, transaction information has a corresponding hash value, hash The value combines each record into a child node and generates a binary tree. The root node, timestamp and identifier of the binary tree are stored in the block header to form a chain structure. Therefore, if you try to modify the record in a block, you need to Modify all blocks in the entire chain. Generally speaking, if more than 6 blocks are generated in the entire chain, it can be considered tamper-proof; unforgeable: the digital signatures of all parties in the data transmission process are also Stored in the blockchain to ensure that the entire structure cannot be forged; traceable: the behaviors of all participants are traceable, and these behaviors are permanently stored in the blockchain, so once a certain behavior is completed, the relevant information cannot be withdrawn Or delete and change.

The transaction method provided by the present disclosure utilizes the data characteristics of the decentralized blockchain network, that is, the immutable, unforgeable and traceable data, to ensure the data security of data products and related transaction information in the transaction process.

In addition, trust issues in the transaction process may include customer rights issues, anonymity and unbinding issues, and collusion issues. Among them, the issue of customer rights: In the traditional watermark agreement, the seller is assumed to be the only trusted party responsible for inserting and extracting watermark signals. Therefore, it cannot be denied that the seller inserts specific watermark signals and treats digitally contaminated multimedia content as unauthorized parties. The dissemination of the approved copy is possible to maliciously frame the buyer, and the buyer cannot make accurate judgments and proofs on whether the seller framed itself; anonymity and unbinding issues: Anonymity issues are the phenomenon that the buyer’s identity is protected until the buyer’s identity is proved to be a crime. The problem of unbinding corresponds to the situation where the unique watermark signal cannot be bound to a specific copy of the digital content; the problem of collusion: two or more untrustworthy parties collude to create piracy, that is, multiple collusion Authors can combine their watermark signal to remove the original watermark signal or generate a new version of the digital watermark content to avoid piracy detection.

FIG. 1 is a flowchart of a transaction method based on a blockchain network provided by an embodiment of the disclosure. As shown in Figure 1, applied to the seller node side in the blockchain network, the method includes:

Step S1, in response to the transaction request of the buyer node, send a negotiation request to a smart contract node (Smart Contract Center, SCC for short, or smart contract center).

In step S1, a negotiation request is sent to the smart contract node to generate a negotiation protocol, where the negotiation protocol is generated by the smart contract node, or the seller node itself generates the negotiation protocol.

Wherein, the transaction request includes the buyer node ID and the transaction product ID, and the buyer node ID has been signed by the buyer node; the negotiation request includes its own seller node ID, buyer node ID, and transaction product ID, and the seller node ID has been signed by the seller node. Signature, the negotiation request can also include a time stamp; the negotiation agreement includes the buyer's transaction key pair

Transaction key pair with seller

The buyer's transaction key pair includes the buyer's transaction public key

Transaction private key with buyer

The seller's transaction key pair includes the seller's transaction public key

Transaction private key with seller

The transaction product identifier is the identifier of the transaction product, and can be used as the description information of the transaction product.

In some embodiments, the buyer node also sends information such as its own buyer node identification and timestamp to the smart contract node. After receiving the negotiation request, the smart contract node verifies whether the corresponding information sent by the buyer node and the seller node are consistent, and verifies The legality and transaction qualifications of the buyer node and the seller node, if the information does not match, or the buyer node and the seller node are recorded in the blacklist, the transaction is cancelled and the smart contract node returns an error response.

In some embodiments, all nodes use their own blockchain node private keys to sign the information when sending information, and other nodes can use their corresponding blockchain node public keys to verify the signature when receiving the information.

Step S2. The transaction product is encrypted by the seller’s transaction public key in the negotiation agreement to generate the first encrypted transaction product, and the first encrypted transaction product and the transaction product identifier are sent to the digital watermarking node (Watermark Certification Authority/Center, WCA for short) Or WCC, or Digital Watermark Center).

In step S2, through the seller’s transaction public key

Encrypt the trading product X to generate the first encrypted trading product

And the first crypto trading product

And the transaction product identification are sent to the digital watermarking node for the digital watermarking node to use the buyer’s transaction public key

To the first crypto trading product

Encrypt and generate a second encrypted transaction product

The digital watermark node is also responsible for inserting a digital watermark on the second encrypted transaction product.

In some embodiments, in response to the seller transaction public key, seller transaction private key, and transaction product identification sent by the smart contract node, the transaction product is encrypted by the seller transaction public key to generate the first encrypted transaction product, and the first encrypted transaction product is encrypted. The transaction product and the transaction product identifier are sent to the digital watermark node.

In some embodiments, the smart contract node also sends the buyer transaction public key; the smart contract node also signs the seller node ID, buyer node ID, transaction product ID, smart contract node ID and other information through the smart contract section public key, and adds it to In the negotiation agreement, the negotiation agreement is written into the blockchain network.

In some embodiments, the overall watermark protocol involved in the method includes a negotiation protocol, a watermark protocol, and an identification verification protocol.

In some embodiments, in step S2, before the step of encrypting the transaction product using the seller’s transaction public key, it further includes: in response to the smart contract node identification sent by the smart contract node, verifying the digital signature of the smart contract node identification, and verifying After passing, perform the step of encrypting the transaction product using the seller's transaction public key in step S2; if the verification fails, the seller node cancels the transaction and searches for the smart contract node again to restart the transaction. In some embodiments, if the transaction product identifier returned by the smart contract node is inconsistent with the transaction product identifier sent by the seller node, or the returned information is missing, the seller node also cancels the transaction.

Step S3: In response to the third encrypted transaction product sent by the digital watermark node, decrypt the third encrypted transaction product with the seller's transaction private key to generate a fourth encrypted transaction product, and send the fourth encrypted transaction product to the buyer node.

In some embodiments, the fourth encrypted transaction product

The seller node uses the built-in Commutative Cryptosystem to trade the private key through the seller

For the third crypto trading product

After decryption, the buyer node receives the fourth encrypted transaction product at this time

The transaction product with watermark can still be obtained by decrypting the buyer's transaction private key.

In step S3, the third encrypted transaction product

The second encrypted trading product by the digital watermarking node

Insert the digital watermark to get. The fourth crypto trading product

After sending to the buyer's node, the buyer's node can get the watermarked transaction product after decrypting it through the buyer's transaction private key

Transaction complete.

The embodiments of the present disclosure provide a transaction method based on a blockchain network, which can be used to establish a transaction between buyers and sellers based on the blockchain network by using the trustless third party without the need to establish a trust relationship with a third party. The watermark protocol solves the trust problem in the digital product transaction process. Among them, the customer's power problem is solved by sending the transaction product with the digital watermark inserted, and the collusion problem is solved by adding an untrusted third party and exchanging a cryptographic system. At the same time, the block is used. The chain network ensures data security. Under the premise of openness and transparency of transaction information, identity information is highly encrypted to ensure personal privacy and improve process efficiency.

FIG. 2 is a flowchart of another transaction method based on a blockchain network provided by an embodiment of the disclosure. As shown in FIG. 2, this method is a specific alternative implementation based on the method shown in FIG. 1. Specifically, the method further includes:

Step S4: In response to the product to be verified whose legality is unknown, an identification request is sent to the digital watermark node.

In step S4, an identification request is sent to the digital watermark node for the digital watermark node to extract the watermark information in the product to be verified, search the database according to the watermark information, and send a verification request to the smart contract node, where the identification request includes Products to be verified. In some embodiments, this step corresponds to the identification verification protocol.

The embodiments of the present disclosure provide a transaction method based on a blockchain network, which can be used to solve the problems of anonymity and unbinding through an untrusted third party and a corresponding identification and verification process.

FIG. 3 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the present disclosure. As shown in Figure 3, applied to the digital watermark node side in the blockchain network, the method includes:

Step S5: Receive the seller node ID, buyer node ID, seller transaction public key, and buyer transaction public key sent by the smart contract node.

Step S6: In response to the first encrypted transaction product and the transaction product identifier sent by the seller node, a digital watermark is generated according to the seller node identifier, the buyer node identifier, and the transaction product identifier.

Among them, the first encrypted trading product

Pass the seller transaction public key for the seller node

Generated after encrypting the trading product X.

FIG. 4 is a flowchart of a specific implementation method of step S6 in an embodiment of the disclosure. As shown in Figure 4, in step S6, the step of generating a digital watermark according to the seller node ID, the buyer node ID, and the product ID specifically includes:

Step S601: Generate a first sub-watermark according to the seller node identifier and the buyer node identifier, and generate a second sub-watermark according to the transaction product identifier and the time stamp information.

In step S601, the digital watermark node generates watermark information according to two specific functions. The two specific functions respectively serve to mark both parties of the transaction according to the seller node identifier and the buyer node identifier, and to mark the transaction product according to the transaction product identifier and time stamp information. .

Specifically, the rules corresponding to the two specific functions are represented by m and n respectively, and the generation process of the first sub-watermark x and the second sub-watermark y is represented by the following formula: x=m(id _B +id _S ), y= n(id _P + TWCC); where id _B and id _S represent the buyer node ID and the seller node ID, respectively, id _P represents the transaction product ID, and TWCC is the time stamp information.

Step S602: Generate a digital watermark according to the first sub-watermark, the second sub-watermark and the random value.

Among them, the digital watermark is a single watermark signal. Under the premise of solving unbinding attacks, the process efficiency of the watermark protocol is improved. At the same time, the insertion of a watermark signal can increase the hiding capacity and avoid ambiguity attacks.

Correspondingly, the generation process of the digital watermark W is expressed by the following formula: W=x+y+f; where f is a random value.

Step S7, encrypt the digital watermark with the seller's transaction public key and the buyer's transaction public key to generate an encrypted digital watermark, and encrypt the first encrypted transaction product with the buyer's transaction public key to generate a second encrypted transaction product.

In some embodiments, the digital watermark node realizes the double encryption of the digital watermark and the transaction product through the built-in privacy homomorphic cryptosystem (Privacy Homomorphic Cryptosystem), and generates the encrypted digital watermark

And the second crypto trading product

Step S8: Insert the encrypted digital watermark into the second encrypted transaction product, generate a third encrypted transaction product, and send the third encrypted transaction product to the seller node.

In step S8, the third encrypted transaction product

Send to the seller node for the seller node to pass the seller transaction private key

For the third crypto trading product

Perform decryption and generate the fourth encrypted transaction product

And the fourth crypto trading product

Sent to the buyer node; the digital watermarking node still signs when sending and sends a timestamp.

Specifically, the generation process of the third encrypted transaction product can be expressed as:

In some embodiments, the encrypted digital watermark is directly inserted into the second encrypted transaction product according to the homomorphism conferred by the above-mentioned double encryption scheme.

In some embodiments, the method further includes:

Encrypt the transaction product identification, seller transaction public key, buyer transaction public key, and third encrypted transaction product with its own digital watermark node public key to generate a watermark protocol, and send the watermark protocol to the smart contract node for the smart contract node Write the watermark protocol into the blockchain network.

The embodiments of the present disclosure provide a transaction method based on a blockchain network. This method is different from inserting more than two watermark signals in the traditional architecture. Only one watermark signal is inserted into the digital product of the transaction. Under the premise, the process efficiency of the watermark protocol is improved, and at the same time, the insertion of a watermark signal can increase the hiding capacity and avoid ambiguity attacks.

Fig. 5 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the present disclosure. As shown in FIG. 5, the method is a specific optional implementation based on the method shown in FIG. 3. Specifically, the method further includes:

Step S9: Store the product identification, the seller's transaction public key, the buyer's transaction public key, and the third encrypted transaction product in the database.

Step S10: Receive the identification request sent by the seller node.

Among them, the identification request includes: the product to be verified.

Step S11: Extract the watermark information in the product to be verified, search the database according to the watermark information, and send a verification request to the smart contract node.

In step S11, if the corresponding information is retrieved, a verification request is sent to the smart contract node for the smart contract node to verify the legality of the product to be verified. The verification request includes the search result and the product identification to be verified of the product to be verified, and the search result records the retrieved transaction product identification, the seller's transaction public key, the buyer's transaction public key, and the third encrypted transaction product.

In some embodiments, the smart contract node receives the verification request, and first verifies whether the surface information matches correctly; after verifying that the surface information matches, decrypts the verification request and extracts the buyer node ID and the seller node ID from the verification request and the blockchain network , Transaction product identification, seller transaction key pair, buyer transaction key pair, integrated watermark information and product identification to be verified, verify whether the product to be verified is compared to the transaction product, add other content, delete original information, and correct the original In the case of information being changed, if at least one of the above conditions is verified, the product to be verified is verified to be illegal.

FIG. 6 is a flowchart of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure. As shown in Figure 6, applied to the smart contract node side, the method includes:

Step S12: In response to the negotiation request sent by the seller node, a negotiation agreement corresponding to the transaction product is generated.

Among them, the negotiation request includes the seller node ID, the buyer node ID, and the transaction product ID; the negotiation agreement includes the buyer transaction key pair and the seller transaction key pair. The buyer transaction key pair includes the buyer transaction public key and the buyer transaction private key, and the seller transaction The key pair includes the seller's transaction public key and the seller's transaction private key.

In some embodiments, the negotiation agreement may also be generated by the seller node itself.

Step S13: Send the seller node identifier, the buyer node identifier, the seller transaction public key and the buyer transaction public key in the negotiation agreement to the digital watermark node.

Step S14: Send the buyer's transaction private key in the negotiation agreement to the buyer node.

Step S15: Send the seller transaction public key and seller transaction private key in the negotiation agreement to the seller node.

In some embodiments, the method further includes: in response to a verification request sent by the digital watermark node, verifying the legitimacy of the product to be verified, wherein the verification request includes: a search result and a product identification of the product to be verified, and the search result is recorded There are retrieved transaction product identification, seller transaction public key, buyer transaction public key and third encrypted transaction product.

In some embodiments, the method further includes: signing the seller node ID, buyer node ID, transaction product ID, and smart contract node ID through its own smart contract section public key, adding it to the negotiation agreement, and writing the negotiation agreement Enter the blockchain network.

FIG. 7 is a signaling diagram of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure. As shown in Figure 7, when applied to a blockchain network, the method includes:

BZ101. The buyer node B sends a transaction request to the seller node S. The transaction request includes the signed buyer node identifier, transaction product identifier, and time stamp.

BZ102. The buyer node B sends the signed buyer node identifier and timestamp to the smart contract node SCC.

BZ2, the seller node S sends a negotiation request to the smart contract node SCC. The negotiation request includes the signed seller node ID, the buyer node ID after the buyer node signature, the transaction product ID and the time stamp.

BZ301, the smart contract node SCC generates a negotiation agreement for this transaction. The negotiation agreement includes a buyer transaction key pair and a seller transaction key pair. The buyer transaction key pair includes the buyer transaction public key and the buyer transaction private key, and the seller transaction key pair Including the seller's transaction public key and the seller's transaction private key. In some embodiments, the negotiation agreement can also be directly generated by the seller node S.

BZ302, the smart contract node SCC sends the transaction product identification and the buyer transaction key pair to the buyer node B.

BZ303, the smart contract node SCC sends the seller transaction key pair and the transaction product identifier to the seller node S.

BZ304, the smart contract node SCC sends the seller node identification signed by the seller node, the buyer node identification signed by the buyer node, the seller transaction public key and the buyer transaction public key to the digital watermark node WCA.

BZ305, the smart contract node SCC signs the seller node ID, buyer node ID, buyer transaction key pair, seller transaction key pair, transaction product ID, smart contract node ID and other information through the smart contract section public key, and adds it to the negotiation agreement , And write to the blockchain network.

BZ4. The seller node S sends the first encrypted transaction product generated by encrypting the transaction product through the seller's transaction public key, together with the transaction product identifier and time stamp, to the digital watermark node WCA.

BZ5, the digital watermark node WCA generates the first sub-watermark according to the seller node identifier and the buyer node identifier, generates the second sub-watermark according to the transaction product identifier and timestamp, and generates the digital watermark according to the first sub-watermark, the second sub-watermark and random values .

BZ6, the digital watermark node WCA encrypts the digital watermark through the seller's transaction public key and the buyer's transaction public key to generate an encrypted digital watermark, and encrypts the encrypted transaction product with the buyer's transaction public key to generate a second encrypted transaction product.

BZ7, the digital watermark node WCA inserts the encrypted digital watermark into the second encrypted transaction product, generates the third encrypted transaction product, and sends the third encrypted transaction product to the seller node S.

BZ801, the digital watermark node WCA uses its own digital watermark node public key to sign the transaction product identifier, the seller’s transaction public key, the buyer’s transaction public key and the third encrypted transaction product to generate a watermark agreement, store the watermark agreement in the database, and Sent to the smart contract node SCC.

BZ802, the smart contract node SCC writes the watermark protocol into the blockchain network.

BZ9. The seller node S decrypts the third encrypted transaction product through the seller's transaction private key, generates a fourth encrypted transaction product, and sends the fourth encrypted transaction product to the buyer node B.

BZ10. After the buyer node B decrypts the fourth encrypted transaction product through the buyer's transaction private key, the transaction product with a watermark is obtained. After the buyer node B's payment behavior is completed, the transaction is completed.

FIG. 8 is a signaling diagram of yet another transaction method based on a blockchain network provided by an embodiment of the disclosure. As shown in Figure 8, when applied to a blockchain network, the method includes:

BZ11. The seller node S retrieves or finds products to be verified that are suspected of being pirated and whose legality is unknown in the network or through other legitimate means, and sends an identification request to the digital watermarking node WCA. The identification request includes the product to be verified.

BZ12. The digital watermark node WCA extracts the watermark information in the product to be verified, and searches the database based on the watermark information. If the corresponding information is retrieved, it sends a verification request to the smart contract node SCC. The verification request includes the search result and the pending product of the product to be verified. The product identification is verified, and the retrieval result records the retrieved transaction product identification, the seller's transaction public key, the buyer's transaction public key, and the third encrypted transaction product.

BZ13, the smart contract node SCC verifies the legality of the product to be verified.

The embodiment of the present disclosure also provides a seller node, including:

One or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors are implemented as in the above-mentioned embodiments Any of the methods includes step S1.

The embodiment of the present disclosure also provides a computer-readable medium on which a computer program is stored, wherein the program is executed by a processor to implement the steps in any method including step S1 in the foregoing embodiments.

The embodiment of the present disclosure also provides a digital watermarking node, including:

One or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors are implemented as in the above-mentioned embodiments Any of the methods includes step S6.

The embodiment of the present disclosure also provides a computer-readable medium on which a computer program is stored, where the program is executed by a processor to realize the steps in any method including step S6 in the foregoing embodiments.

The embodiment of the present disclosure also provides a smart contract node, including:

One or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors are implemented as in the above-mentioned embodiments Any one of the methods includes step S12.

The embodiment of the present disclosure also provides a computer-readable medium on which a computer program is stored, where the program is executed by a processor to implement the steps in any method including step S12 in the foregoing embodiments.

A person of ordinary skill in the art can understand that all or some of the steps in the method disclosed above, and the functional modules/units in the device can be implemented as software, firmware, hardware, and appropriate combinations thereof. In the hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may consist of several physical components. The components are executed cooperatively. Certain physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit . Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium). As is well known by those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media. Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other storage technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or Any other medium used to store desired information and that can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media. .

Example embodiments have been disclosed herein, and although specific terms are adopted, they are used and should only be interpreted as general descriptive meanings, and are not used for the purpose of limitation. In some instances, it is obvious to those skilled in the art that, unless expressly indicated otherwise, the features, characteristics, and/or elements described in combination with a particular embodiment can be used alone, or features, characteristics, and/or elements described in combination with other embodiments can be used, Combination of features and/or components. Therefore, those skilled in the art will understand that various changes in form and details can be made without departing from the scope of the present disclosure as set forth by the appended claims.

Claims

A transaction method based on a blockchain network, which is characterized in that it includes:

In response to the transaction request of the buyer node, a negotiation request is sent to the smart contract node to generate a negotiation agreement; wherein the transaction request includes the buyer node identifier and the transaction product identifier, and the negotiation request includes its own seller node identifier, The buyer node identifier and the transaction product identifier;

The transaction product is encrypted by the seller’s transaction public key in the negotiation agreement to generate a first encrypted transaction product, and the first encrypted transaction product and the transaction product identifier are sent to the digital watermarking node for the digital watermarking node Encrypting the first encrypted transaction product by using the buyer's transaction public key to generate a second encrypted transaction product;

In response to the third encrypted transaction product sent by the digital watermark node, decrypt the third encrypted transaction product by the seller's transaction private key, generate a fourth encrypted transaction product, and send the fourth encrypted transaction product To the buyer node.
The method according to claim 1, characterized in that, before the step of using the seller's transaction public key to encrypt the transaction product, the method further comprises:

In response to the smart contract node identifier sent by the smart contract node, the digital signature of the smart contract node identifier is verified, and after the verification is passed, the step of using the seller's transaction public key to encrypt the transaction product is executed.
The method according to claim 1, further comprising:

In response to the product to be verified whose legality is unknown, an identification request is sent to the digital watermark node for the digital watermark node to extract the watermark information in the product to be verified, to search in the database according to the watermark information, and Send a verification request to the smart contract node, where the identification request includes: the product to be verified.
A transaction method based on a blockchain network, which is characterized in that it includes:

Receive the seller node ID, buyer node ID, seller transaction public key, and buyer transaction public key sent by the smart contract node;

In response to the first encrypted transaction product and transaction product identifier sent by the seller node, a digital watermark is generated according to the seller node identifier, the buyer node identifier, and the transaction product identifier, wherein the first encrypted transaction product is the Generated after the seller node encrypts the transaction product through the seller's transaction public key;

The digital watermark is encrypted by the seller transaction public key and the buyer transaction public key to generate an encrypted digital watermark, and the first encrypted transaction product is encrypted by the buyer transaction public key to generate a second encryption Trading products;

Insert the encrypted digital watermark into the second encrypted transaction product to generate a third encrypted transaction product, and send the third encrypted transaction product to the seller node, so that the seller node can exchange information with the seller’s transaction private key. The third encrypted transaction product is decrypted, a fourth encrypted transaction product is generated, and the fourth encrypted transaction product is sent to the buyer node.
The method according to claim 4, wherein the step of generating a digital watermark according to the seller node ID, the buyer node ID, and the product ID specifically includes:

Generating a first sub-watermark according to the seller node identifier and the buyer node identifier, and generating a second sub-watermark according to the transaction product identifier and timestamp information;

The digital watermark is generated according to the first sub-watermark, the second sub-watermark, and a random value.
The method according to claim 4, further comprising:

Encrypt the transaction product identifier, the seller’s transaction public key, the buyer’s transaction public key, and the third encrypted transaction product with its own digital watermark node public key to generate a watermark protocol, and send the watermark protocol To the smart contract node for the smart contract node to write the watermark protocol into the blockchain network.
The method according to claim 4, further comprising:

The product identification, the seller's transaction public key, the buyer's transaction public key, and the third encrypted transaction product are stored in a database.
The method according to claim 7, further comprising:

Receiving an identification request sent by the seller node, where the identification request includes: a product to be verified;

Extract the watermark information in the product to be verified, search in the database based on the watermark information, and send a verification request to the smart contract node for the smart contract node to verify the legality of the product to be verified The verification request includes: a search result and a product identification to be verified of the product to be verified, and the search result records the retrieved transaction product identification, the seller's transaction public key, the buyer's transaction public key, and the third encryption Trading products.
A transaction method based on a blockchain network, which is characterized in that it includes:

In response to the negotiation request sent by the seller node, a negotiation agreement corresponding to the transaction product is generated; wherein the negotiation request includes: a seller node identifier, a buyer node identifier, and a transaction product identifier of the transaction product;

Send the seller node ID, the buyer node ID, the seller transaction public key and the buyer transaction public key in the negotiation agreement to the digital watermark node; send the buyer transaction private key in the negotiation agreement to the buyer node; send the negotiation The seller transaction public key and seller transaction private key in the agreement are sent to the seller node.
The method according to claim 9, further comprising:

In response to the verification request sent by the digital watermark node, the legitimacy of the product to be verified is verified, wherein the verification request includes: a search result and a product identification of the product to be verified, and the search result records the The transaction product identification, the seller’s transaction public key, the buyer’s transaction public key and the third encrypted transaction product.
The method according to claim 10, further comprising:

Sign the seller node identifier, the buyer node identifier, the transaction product identifier, and the smart contract node identifier through its own smart contract section public key, add it to the negotiation agreement, and write the negotiation agreement Blockchain network.
A seller node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 3.
A computer readable medium having a computer program stored thereon, wherein the program is executed by a processor to implement the steps in the method according to any one of claims 1 to 3.
A digital watermark node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 4 to 8.
A computer-readable medium having a computer program stored thereon, wherein the program is executed by a processor to implement the steps in the method according to any one of claims 4 to 8.
A smart contract node, including:

One or more processors;

Storage device for storing one or more programs;

When the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 9 to 11.
A computer readable medium having a computer program stored thereon, wherein the program is executed by a processor to implement the steps in the method according to any one of claims 9 to 11.