Method, apparatus for blockchain-based multi-party computation, device and medium

A method for blockchain-based multi-party computation, executed by a server, the method comprising:

• receiving ciphertexts of business data sent from participant devices, the ciphertexts of the business data being obtained by encrypting the business data of the participant devices;
• acquiring hash results of the business data from a blockchain, the hash results of the business data being obtained by hashing the ciphertexts of the business data;
• and
• performing multi-party computation by a trusted computing module, based on the ciphertexts of the business data and the hash results of the business data to obtain a multi-party computation result, comprising:
• determining a target random number, based on an interaction between the trusted computing module and the participant devices;
• acquiring key ciphertexts from the participant devices, wherein the key ciphertexts are obtained by encrypting keys using the target random number;
• decrypting, by the trusted computing module, the key ciphertexts using the target random number, to obtain the keys;
• decrypting, by the trusted computing module, the ciphertexts of the business data using the keys to obtain the business data;
• and
• attesting the business data based on the hash results of the business data.