Blockchain-based transaction privacy

1. A computer-implemented blockchain-based transaction obfuscation method, comprising:

determining a submission time based on a base time and a submission time interval;

determining that no actual transaction information is obtained between the base time and the submission time during the submission time interval;

generating false transaction information;

cryptographically encoding transaction content in the false transaction information; and

subsequent to the submission time, submitting the false transaction information to a blockchain to obfuscate a number of actual transactions in the blockchain.

2. The computer-implemented method of claim 1 , wherein the base time comprises at least one of:

a time of submitting previous false transaction information to the blockchain; or

a time of submitting previous actual transaction information to the blockchain.

3. The computer-implemented method of claim 1 , wherein generating the false transaction information comprises:

generating the false transaction information in response to determining that no actual transaction information is obtained.

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

determining a second submission time based on a time of submitting the false transaction information and based on a second submission time interval;

between the time of submitting the false transaction information and the second submission time during the second submission time interval, obtaining actual transaction information;

cryptographically encoding actual transaction content in the actual transaction information; and

submitting the actual transaction information to the blockchain.

5. The computer-implemented method of claim 1 , comprising determining the submission time interval based on an exponential distribution or an Erlang distribution.

6. The computer-implemented method of claim 1 , wherein the transaction content in the false transaction information comprises at least one of:

a transaction amount with a value of zero; or

blank storage information.

7. The computer-implemented method of claim 1 , wherein generating the false transaction information comprises:

randomly selecting an account identifier from the blockchain as a receiver account identifier in the false transaction information.

8. The computer-implemented method of claim 1 , further comprising:

obtaining an account identifier set, wherein the account identifier set comprises a plurality of account identifiers, and wherein each account identifier corresponds to a baseline transaction ratio;

obtaining corresponding ratios of actual transactions between an initiator account identifier and each account identifier in the account identifier set; and

selecting, from the account identifier set, a first account identifier whose ratio of actual transactions with the initiator account identifier is less than or equal to the baseline transaction ratio of the first account identifier; and

including the first account identifier in the false transaction information as a receiver account identifier.

9. A non-transitory, computer-readable medium storing one or more instructions that, when executed by a computer system, cause the computer system to perform operations comprising:

determining a submission time based on a base time and a submission time interval;

determining that no actual transaction information is obtained between the base time and the submission time during the submission time interval;

generating false transaction information;

cryptographically encoding transaction content in the false transaction information; and

subsequent to the submission time, submitting the false transaction information to a blockchain to obfuscate a number of actual transactions in the blockchain.

10. The non-transitory, computer-readable medium of claim 9 , wherein the base time comprises at least one of:

a time of submitting previous false transaction information to the blockchain; or

a time of submitting previous actual transaction information to the blockchain.

11. The non-transitory, computer-readable medium of claim 9 , wherein generating the false transaction information comprises:

generating the false transaction information in response to determining that no actual transaction information is obtained.

12. The non-transitory, computer-readable medium of claim 9 , wherein the operations comprise:

determining a second submission time based on a time of submitting the false transaction information and based on a second submission time interval;

between the time of submitting the false transaction information and the second submission time during the second submission time interval, obtaining actual transaction information;

cryptographically encoding actual transaction content in the actual transaction information; and

submitting the actual transaction information to the blockchain.

13. The non-transitory, computer-readable medium of claim 9 , wherein the operations comprise determining the submission time interval based on an exponential distribution or an Erlang distribution.

14. The non-transitory, computer-readable medium of claim 9 , wherein the transaction content in the false transaction information comprises at least one of:

a transaction amount with a value of zero; or

blank storage information.

15. The non-transitory, computer-readable medium of claim 9 , wherein generating the false transaction information comprises:

randomly selecting an account identifier from the blockchain as a receiver account identifier in the false transaction information.

16. The non-transitory, computer-readable medium of claim 9 , wherein the operations comprise:

obtaining an account identifier set, wherein the account identifier set comprises a plurality of account identifiers, and wherein each account identifier corresponds to a baseline transaction ratio;

obtaining corresponding ratios of actual transactions between an initiator account identifier and each account identifier in the account identifier set; and

selecting, from the account identifier set, a first account identifier whose ratio of actual transactions with the initiator account identifier is less than or equal to the baseline transaction ratio of the first account identifier; and

including the first account identifier in the false transaction information as a receiver account identifier.

17. 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, cause the one or more computers to perform one or more operations comprising:

determining a submission time based on a base time and a submission time interval;

determining that no actual transaction information is obtained between the base time and the submission time during the submission time interval;

generating false transaction information;

cryptographically encoding transaction content in the false transaction information; and

subsequent to the submission time, submitting the false transaction information to a blockchain to obfuscate a number of actual transactions in the blockchain.

18. The computer-implemented system of claim 17 , wherein the base time comprises at least one of:

a time of submitting previous false transaction information to the blockchain; or

a time of submitting previous actual transaction information to the blockchain.

19. The computer-implemented system of claim 17 , wherein generating the false transaction information comprises:

generating the false transaction information in response to determining that no actual transaction information is obtained.

20. The computer-implemented system of claim 17 , wherein the operations comprise:

determining a second submission time based on a time of submitting the false transaction information and based on a second submission time interval;

between the time of submitting the false transaction information and the second submission time during the second submission time interval, obtaining actual transaction information;

cryptographically encoding actual transaction content in the actual transaction information; and

submitting the actual transaction information to the blockchain.