METHOD FOR IMPLEMENTING PRIVACY PROTECTION IN BLOCKCHAIN

摘要

Embodiments of the present application disclose methods for implementing privacy protection in a blockchain. The methods include the following: a client device encrypts a transaction including a smart contract, and sends the encrypted transaction to a first blockchain node, where code of the smart contract includes a contract state indicated by a privacy identifier; and the first blockchain node decrypts the code of the smart contract in the transaction, executes the code of the smart contract in a trusted execution environment, uses a key to encrypt the contract state indicated by the privacy identifier, and writes the encrypted contract state to a database. According to the embodiments of the present application, the contract state indicated with privacy protection can be flexibly encrypted.