Data processing method and apparatus
A data processing method may include: determining, by a transaction initiation node in a blockchain, transaction data of a transaction and information to be hidden in the transaction data; obtaining, by using the transaction data as an input of a predetermined one-way function, a transaction root of the transaction, and constructing, based on the transaction root, proof data corresponding to the information to be hidden; and, after signing the transaction root, initiating a transaction request to write the transaction root and the proof data on the blockchain, for a node in the blockchain to perform consensus verification on the transaction root and the proof data, and approve or reject the transaction request based on a verification result.
1. A data processing method, comprising:
determining, by a computing device of a transaction initiator, information to be hidden in transaction data;
determining pre-transaction data and post-transaction data in the transaction data;
obtaining, by using the pre-transaction data as an input of a first predetermined one-way function, an input transaction root that is output by the first predetermined one-way function;
obtaining, by using the post-transaction data as an input of a second predetermined one-way function, an output transaction root that is output by the second predetermined one-way function, wherein the output transaction root is obtained by:
constructing, according to the post-transaction data and a random number, a bottom layer of a predetermined one-way function tree, and
determining the output transaction root corresponding to a top layer of the predetermined one-way function tree;
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
sending, by the computing device of the transaction initiator, the input transaction root, the output transaction root, and the proof data to a computing device of a transaction receiver for the computing device of the transaction receiver to perform verification on the input transaction root and the output transaction root, and to initiate, after the verification succeeds, a transaction request to write the proof data and input transaction root and the output transaction root carrying signatures of the transaction initiator and the transaction receiver on a blockchain.
2. The method according to claim 1 , wherein the constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden comprises:
performing, by using the input transaction root, the output transaction root, and the information to be hidden as inputs, a predetermined logical operation; and
performing, by using the information to be hidden as a protected object, a zero-knowledge proof on the logical operation to obtain the proof data.
3. The method according to claim 1 , wherein the second predetermined one-way function comprises the predetermined one-way function tree.
4. The method according to claim 1 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising selecting data corresponding to one or more key words.
5. The method according to claim 4 , wherein the one or more key words comprise “balance” and “transaction amount”.
6. The method according to claim 1 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising determining an item in the transaction data corresponding to a predetermined hidden item and content of the item as information to be hidden.
7. The method according to claim 6 , wherein the predetermined hidden item comprises pre-transaction and post-transaction balances.
8. The method according to claim 1 , wherein determining information to be hidden in the transaction data comprises: determining and labeling, by the computing device of the transaction initiator, information to be hidden in transaction data.
9. One or more non-transitory computer-readable storage media configured with instructions executable by one or more processors to cause the one or more processors to perform operations comprising:
determining information to be hidden in transaction data;
determining pre-transaction data and post-transaction data in the transaction data;
obtaining, by using the pre-transaction data as an input of a first predetermined one-way function, an input transaction root that is output by the first predetermined one-way function;
obtaining, by using the post-transaction data as an input of a second predetermined one-way function, an output transaction root that is output by the second predetermined one-way function, wherein the output transaction root is obtained by:
constructing, according to the post-transaction data and a random number, a bottom layer of a predetermined one-way function tree, and
determining the output transaction root corresponding to a top layer of the predetermined one-way function tree;
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
sending the input transaction root, the output transaction root, and the proof data to a computing device of a transaction receiver for the computing device of the transaction receiver to perform verification on the input transaction root and the output transaction root, and to initiate, after the verification succeeds, a transaction request to write the proof data and input transaction root and the output transaction root carrying signatures of a transaction initiator and the transaction receiver on a blockchain.
10. The one or more non-transitory computer-readable storage media of claim 9 , wherein the constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden comprises:
performing, by using the input transaction root and the output transaction root and the information to be hidden as inputs, a predetermined logical operation; and
performing, by using the information to be hidden as a protected object, a zero-knowledge proof on the logical operation to obtain the proof data.
11. The one or more non-transitory computer-readable storage media according to claim 9 , wherein the second predetermined one-way function comprises the predetermined one-way function tree.
12. The one or more non-transitory computer-readable storage media according to claim 9 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising selecting data corresponding to one or more key words.
13. The one or more non-transitory computer-readable storage media according to claim 9 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising determining an item in the transaction data corresponding to a predetermined hidden item and content of the item as information to be hidden.
14. The one or more non-transitory computer-readable storage media according to claim 13 , wherein the predetermined hidden item comprises pre-transaction and post-transaction balances.
15. An apparatus comprising:
one or more processors; and
a memory storing instructions executable by the one or more processors to cause the one or more processors to perform operations comprising:
determining information to be hidden in transaction data;
determining pre-transaction data and post-transaction data in the transaction data;
obtaining, by using the pre-transaction data as an input of a first predetermined one-way function, an input transaction root that is output by the first predetermined one-way function;
obtaining, by using the post-transaction data as an input of a second predetermined one-way function, an output transaction root that is output by the second predetermined one-way function, wherein the output transaction root is obtained by:
constructing, according to the post-transaction data and a random number, a bottom layer of a predetermined one-way function tree, and
determining the output transaction root corresponding to a top layer of the predetermined one-way function tree;
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
sending the input transaction root, the output transaction root, and the proof data to a computing device of a transaction receiver for the computing device of the transaction receiver to perform verification on the input transaction root and the output transaction root, and to initiate, after the verification succeeds, a transaction request to write the proof data and input transaction root and the output transaction root carrying signatures of a transaction initiator and the transaction receiver on a blockchain.
16. The apparatus according to claim 15 , wherein the constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden comprises:
performing, by using the input transaction root and the output transaction root and the information to be hidden as inputs, a predetermined logical operation; and
performing, by using the information to be hidden as a protected object, a zero-knowledge proof on the logical operation to obtain the proof data.
17. The apparatus according to claim 15 , wherein the second predetermined one-way function comprises the predetermined one-way function tree.
18. The apparatus according to claim 15 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising selecting data corresponding to one or more key words.
19. The apparatus according to claim 15 , wherein determining information to be hidden in the transaction data comprises determining information to be hidden in the transaction data according to a hiding rule, the hiding rule comprising determining an item in the transaction data corresponding to a predetermined hidden item and content of the item as information to be hidden.
20. The apparatus according to claim 19 , wherein the predetermined hidden item comprises pre-transaction and post-transaction balances.