Managing a smart contract on a blockchain

A computer-implemented method comprising:

• in response to a first client device invoking a transaction with respect to a target smart contract, obtaining, by a blockchain node device in a blockchain, encrypted contract codes of the target smart contract, wherein the encrypted contract codes are stored in distributed ledgers of the blockchain, and wherein a trusted execution environment is installed on the blockchain node device;
• transmitting the encrypted contract codes of the target smart contract to the trusted execution environment;
• extracting a decryption key stored in the trusted execution environment, wherein the decryption key corresponds to the encrypted contract codes of the target smart contract;
• decrypting the encrypted contract codes of the target smart contract using the extracted decryption key, to obtain decrypted contract codes;
• executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;
• obtaining a smart contract management rule;
• determining, in the trusted execution environment, that the target smart contract is a managed smart contract based on the smart contract management rule;
• and
• in response to determining that the target smart contract is a managed smart contract, transmitting, to the first client device, a failure message.

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• in response to a first client device invoking a transaction with respect to a target smart contract, obtaining, by a blockchain node device in a blockchain, encrypted contract codes of the target smart contract, wherein the encrypted contract codes are stored in distributed ledgers of the blockchain, and wherein a trusted execution environment is installed on the blockchain node device;
• transmitting the encrypted contract codes of the target smart contract to the trusted execution environment;
• extracting a decryption key stored in the trusted execution environment, wherein the decryption key corresponds to the encrypted contract codes of the target smart contract;
• decrypting the encrypted contract codes of the target smart contract using the extracted decryption key, to obtain decrypted contract codes;
• executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;
• obtaining a smart contract management rule;
• determining, in the trusted execution environment, that the target smart contract is a managed smart contract based on the smart contract management rule;
• and
• in response to determining that the target smart contract is a managed smart contract, transmitting, to the first client device, a failure message.

A computer-implemented system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• in response to a first client device invoking a transaction with respect to a target smart contract, obtaining, by a blockchain node device in a blockchain, encrypted contract codes of the target smart contract, wherein the encrypted contract codes are stored in distributed ledgers of the blockchain, and wherein a trusted execution environment is installed on the blockchain node device;
• transmitting the encrypted contract codes of the target smart contract to the trusted execution environment;
• extracting a decryption key stored in the trusted execution environment, wherein the decryption key corresponds to the encrypted contract codes of the target smart contract;
• decrypting the encrypted contract codes of the target smart contract using the extracted decryption key, to obtain decrypted contract codes;
• executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;
• obtaining a smart contract management rule;
• determining, in the trusted execution environment, that the target smart contract is a managed smart contract based on the smart contract management rule;
• and
• in response to determining that the target smart contract is a managed smart contract, transmitting, to the first client device, a failure message.