One or more embodiments of the present specification provide a method for realizing privacy protection in a block chain, a node and a storage medium. The method comprises: a first block chain node receiving a transaction initiated by a client, the transaction having one or more corresponding smart contracts; the first block chain node executing the transaction to obtain plaintext receipt data, wherein the plaintext receipt data comprises plaintext receipt sub-data corresponding to each smart contract; when determining that the first smart contract corresponding to the transaction has an encryption identifier, the first block chain node encrypting plaintext receipt sub-data corresponding to the first intelligent contract into ciphertext receipt sub-data by using a secret key, and the ciphertext receipt data corresponding to the plaintext receipt data comprises the ciphertext receipt sub-data; and the first block chain node stores the ciphertext receipt data.

Method for realizing privacy protection in block chain, node and storage medium

The present disclosure proposes a block chain-based data processing method, apparatus, storage medium, and electronic device for protecting a private transaction of a block chain node. The method includes: receiving a block in a blockchain network; the block includes a sub-block, the sub-block includes data corresponding to the smart contract code and the smart contract code; and obtaining the private key from the management contract by using a pre-acquired private key a secret key; obtaining a smart contract code in the sub-block according to the secret key, so that the first block chain nodeexecutes the smart contract code; encrypting and writing the data generated by the smart contract code and the block chain node to execute the smart contract code In the block; the sub-block is written into the block of the block chain node.

Block chain-based data processing method, apparatus, storage medium, and electronic device

The embodiment of the invention discloses a vehicle-mounted terminal payment method, which comprises the following steps that: detecting the state information of a vehicle, and searching a smart contract related to the vehicle on a blockchain, wherein the smart contract comprises a trigger condition, service requirements and payment information; if the state information meets the trigger condition, searching a target merchant which is registered in advance and meets the service requirements on the blockchain; and after the vehicle receives smart service provided by the target merchant, according to the payment information, paying fees to the target merchant. The embodiment of the invention also discloses a vehicle-mounted payment terminal. When the method and the terminal are adopted, a vehicle is linked to the blockchain through the vehicle-mounted terminal, and the target merchant which meets the service requirements are searched on the blockchain; after the service of the target merchant is received, the fees are paid for the target merchant through a blockchain technology, a centralized payment mode is not in the presence, and payment between objects is realized.

Vehicle-mounted terminal payment method, terminal and computer readable storage medium

The invention discloses an artwork circulation, authentication and registration method based on a blockchain and an expert system According to the method, registration for an authentication result of an artwork is completed by smart contracts of authentication markets, and then the artwork is allowed to be circulated and recorded in smart contracts of trading markets According to the method, block information accumulated in the smart contracts of the authentication markets is utilized, and knowledge is acquired outside the blockchain by machine learning of authentication information, the expert system is established, and a need for the commodity authentication validity and authentication result checking is met through providing an authentication suggestion for the artwork of which an inquiry is to the expert system In addition, under the premise of protecting the identity privacy of a trader from disclosure, the smart contracts of the trading markets and the smart contracts of the authentication markets are combined, and cultural relic registration is established to specifically record a circulation state and an authentication result of a cultural relic Ultimately, decentralization is realized in a trading process of the artwork by virtue of the above-mentioned method, and gain effects of creditability, convenience and a low cost are achieved at the same time

Artwork circulation, authentication and registration method based on blockchain and expert system

The invention discloses a privacy protection transaction method based on a blockchain technology in electronic commerce. The method comprises the following steps that: adopting the blockchain technology which comprises a privacy smart contract and a zero-knowledge proof to protect the private information of a user; taking the privacy smart contract as a bridge between a buyer and a seller in a transaction period; adopting the zero-knowledge proof to issue a confidentiality token and create a confidentiality transaction; and combining the blockchain, an industrial data space and the Internet ofThings technology to establish infrastructure, and establishing an integrated platform for logistics business management in a distribution way. By use of the method, private information can be hiddenfor dispatchers, private information, including, identity, address, telephone number and the like, can be hidden for sellers, in addition, the method also can be used for other blockchain applicationscenes with a data privacy protection requirement, in addition, blockchain characteristics can be fully utilized, and therefore, the evaluation problem of an electronic commerce platform can be improved.

Privacy protection transaction method based on blockchain technology in electronic commerce

The invention provides a privacy preserving intelligent contract method in a block chain. The content information of a digital asset trading participant is encrypted in the intelligent contract, and ciphertext processing is carried out; the intelligent contract x adopts a Merkle tree structure, a leaf node of the Merkle tree is encrypted through a public key, and a Hash digest value is adopted to replace original data of a block head. In comparison with the prior art, in a block chain with data privacy preserving requirements, digital asset trading data and process privacy preserving functions are realized, the intelligent contract trading participant can only check the trading information, and the method can be applied to any block chain application scene with data privacy preserving requirements.

Li Dashuang

Papers

Privacy preserving intelligent contract method in block chain