Application US20200167503

MANAGING A SMART CONTRACT ON A BLOCKCHAIN
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US20200167503

1. A computer-implemented method comprising: (4) (9)

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;

obtaining a smart contract management rule;

determining, in the trusted execution environment, that the target smart contract is not a managed smart contract based on the smart contract management rule;

in response to determining that the target smart contract is not a managed smart contract, 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;

executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;

encrypting the execution result; and

transmitting the encrypted execution result to the distributed ledgers of the blockchain for storage.

2. The computer-implemented method of claim 1, wherein the trusted execution environment stores the extracted decryption key and a plurality of other decryption keys corresponding to other encrypted contract codes, respectively, of other smart contracts stored in the distributed ledgers of the blockchain; and (1) (1)

4. The computer-implemented method of claim 1, further comprising: (1) (4)

receiving creation transaction data corresponding to a creation transaction initiated by a second client device with respect to the target smart contract, wherein the creation transaction data comprises the encrypted contract codes of the target smart contract;

in response to receiving the creation transaction data, creating the target smart contract by executing smart contract creation codes in the trusted execution environment;

creating a contract account on the blockchain, wherein the contract account corresponds to the target smart contract; and

transmitting the encrypted contract codes of the target smart contract to the distributed ledgers of the blockchain for storage.

5. The computer-implemented method of claim 4, wherein the encrypted contract codes of the target smart contract are generated by the second client device using a first encryption method that comprises any one of the following: a symmetric encryption method, an asymmetric encryption method, or a symmetric encryption method combined with an asymmetric encryption method, and (0) (1)

6. The computer-implemented method of claim 1, wherein obtaining the smart contract management rule comprises: (0) (3)

7. The computer-implemented method of claim 1, wherein the smart contract management rule comprises a smart contract blacklist comprising contract addresses of managed smart contracts, and (0) (1)

8. A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising: (4) (9)

transmitting the encrypted contract codes of the target smart contract to the trusted execution environment;

obtaining a smart contract management rule;

determining, in the trusted execution environment, that the target smart contract is not a managed smart contract based on the smart contract management rule;

decrypting the encrypted contract codes of the target smart contract using the extracted decryption key;

executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;

encrypting the execution result; and

transmitting the encrypted execution result to the distributed ledgers of the blockchain for storage.

9. The non-transitory, computer-readable medium of claim 8, wherein the trusted execution environment stores the extracted decryption key and a plurality of other decryption keys corresponding to other encrypted contract codes, respectively, of other smart contracts stored in the distributed ledgers of the blockchain; and (1) (1)

11. The non-transitory, computer-readable medium of claim 8, wherein the operations further comprise: (1) (4)

in response to receiving the creation transaction data, creating the target smart contract by executing smart contract creation codes in the trusted execution environment;

creating a contract account on the blockchain, wherein the contract account corresponds to the target smart contract; and

transmitting the encrypted contract codes of the target smart contract to the distributed ledgers of the blockchain for storage.

12. The non-transitory, computer-readable medium of claim 11, wherein the encrypted contract codes of the target smart contract are generated by the second client device using a first encryption method that comprises any one of the following: a symmetric encryption method, an asymmetric encryption method, or a symmetric encryption method combined with an asymmetric encryption method, and (0) (1)

13. The non-transitory, computer-readable medium of claim 8, wherein obtaining the smart contract management rule comprises: (0) (3)

14. The non-transitory, computer-readable medium of claim 8, wherein the smart contract management rule comprises a smart contract blacklist comprising contract addresses of managed smart contracts, and (0) (1)

15. A computer-implemented system, comprising: (4) (2)

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;

obtaining a smart contract management rule;

determining, in the trusted execution environment, that the target smart contract is not a managed smart contract based on the smart contract management rule;

decrypting the encrypted contract codes of the target smart contract using the extracted decryption key;

executing the decrypted contract codes of the target smart contract in the trusted execution environment to obtain an execution result;

encrypting the execution result; and

transmitting the encrypted execution result to the distributed ledgers of the blockchain for storage.

16. The computer-implemented system of claim 15, wherein the trusted execution environment stores the extracted decryption key and a plurality of other decryption keys corresponding to other encrypted contract codes, respectively, of other smart contracts stored in the distributed ledgers of the blockchain; and (1) (1)

18. The computer-implemented system of claim 15, wherein the operations further comprise: (0) (4)

in response to receiving the creation transaction data, creating the target smart contract by executing smart contract creation codes in the trusted execution environment;

creating a contract account on the blockchain, wherein the contract account corresponds to the target smart contract; and

transmitting the encrypted contract codes of the target smart contract to the distributed ledgers of the blockchain for storage.

19. The computer-implemented system of claim 15, wherein obtaining the smart contract management rule comprises: (0) (3)

20. The computer-implemented system of claim 15, wherein the smart contract management rule comprises a smart contract blacklist comprising contract addresses of managed smart contracts, and (0) (1)

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Application US20200167503

MANAGING A SMART CONTRACT ON A BLOCKCHAIN

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