Methods and apparatuses for reading blockchain data

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

• receiving, by a node in a blockchain network, a data retrieving request that comprises a target transaction identifier;
• identifying, by the node, a transaction storage location that corresponds to the target transaction identifier as a target transaction storage location based on a pre-stored correspondence between transaction identifiers of transactions recorded on a blockchain associated with the blockchain network and transaction storage locations of the transactions;
• and
• retrieving data from the target transaction storage location in the blockchain, wherein the data is concealed data that replaces a target transaction identified by the target transaction identifier and originally stored in the target transaction storage location, wherein the concealed data comprises a transaction hash of the target transaction, wherein replacing the target transaction identified by the target transaction identifier comprises:
• obtaining the transaction hash of the target transaction;
• concatenating a predetermined front marking character to a header of the transaction hash to generate a first concatenation;
• identifying the concealed data based on the first concatenation;
• and
• replacing the target transaction with the concealed data.

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:
• receiving, by a node in a blockchain network, a data retrieving request that comprises a target transaction identifier;
• identifying, by the node, a transaction storage location that corresponds to the target transaction identifier as a target transaction storage location based on a pre-stored correspondence between transaction identifiers of transactions recorded on a blockchain associated with the blockchain network and transaction storage locations of the transactions;
• and
• retrieving data from the target transaction storage location in the blockchain, wherein the data is concealed data that replaces a target transaction identified by the target transaction identifier and originally stored in the target transaction storage location, wherein the concealed data comprises a transaction hash of the target transaction, wherein replacing the target transaction identified by the target transaction identifier comprises:
• obtaining the transaction hash of the target transaction;
• concatenating a predetermined front marking character to a header of the transaction hash to generate a first concatenation;
• identifying the concealed data based on the first concatenation;
• and
• replacing the target transaction with the concealed data.