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 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; and
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
initiating a transaction request to write the proof data and the input transaction root and the output transaction root carrying a signature of a transaction initiator on a blockchain, for a node in the blockchain to perform consensus verification on the input transaction root and the output transaction root and the proof data, and approve or reject the transaction request according to a verification result.
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 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.
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 transaction initiator, information to be hidden in transaction data.
9. A non-transitory computer-readable storage medium configured with instructions executable by one or more processors to cause the one or more processors to perform operations comprising:
determining, by 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; and
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
initiating a transaction request to write the proof data and the input transaction root and the output transaction root carrying a signature of the transaction initiator on a blockchain, for a node in the blockchain to perform consensus verification on the input transaction root and the output transaction root and the proof data, and approve or reject the transaction request according to a verification result.
10. The non-transitory computer-readable storage medium 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 non-transitory computer-readable storage medium according to claim 9 , wherein the second predetermined one-way function comprises the predetermined one-way function tree.
12. The non-transitory computer-readable storage medium 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 non-transitory computer-readable storage medium 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 non-transitory computer-readable storage medium 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; and
constructing, according to the input transaction root and the output transaction root, proof data of validity of the information to be hidden; and
initiating a transaction request to write the proof data and the input transaction root and the output transaction root carrying a signature of a transaction initiator on a blockchain, for a node in the blockchain to perform consensus verification on the input transaction root and the output transaction root and the proof data, and approve or reject the transaction request according to a verification result.
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.