Index creation for data records

A computer-implemented index creation method comprising:

• obtaining a first attribute value stored in a data record in a blockchain ledger;
• determining location information of the data record in the blockchain ledger, wherein the location information comprises a block height of a first data block in which the data record is located and an offset of the data record in the first data block;
• writing the location information into an index, wherein the index stores a correspondence between the location information and the first attribute value, the first attribute value being used as a primary key in the index;
• receiving a verification instruction comprising a second attribute value and a block height parameter specifying a block interval;
• performing matching in the index based on the second attribute value, to determine corresponding location information identifying one or more data records that include the second attribute value;
• identifying, from the one or more data records that include the second attribute value, a subset of data records that include the second attribute value and are included in the block interval;
• and
• performing integrity verification on the subset of data records,
• wherein each data block in the blockchain ledger after an initial block comprises at least one data record, and
• wherein each data block in the blockchain ledger after the initial block comprises a corresponding hash value, the corresponding hash value based on a hash value of a previous data block to the data block and on a data record included in the data block.

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

• obtaining a first attribute value stored in a data record in a blockchain ledger;
• determining location information of the data record in the blockchain ledger, wherein the location information comprises a block height of a first data block in which the data record is located and an offset of the data record in the first data block;
• writing the location information into an index, wherein the index stores a correspondence between the location information and the first attribute value, the first attribute value being used as a primary key in the index;
• receiving a verification instruction comprising a second attribute value and a block height parameter specifying a block interval;
• performing matching in the index based on the second attribute value, to determine corresponding location information identifying one or more data records that include the second attribute value;
• identifying, from the one or more data records that include the second attribute value, a subset of data records that include the second attribute value and are included in the block interval;
• and
• performing integrity verification on the subset of data records,
• wherein each data block in the blockchain ledger after an initial block comprises at least one data record, and
• wherein each data block in the blockchain ledger after the initial block comprises a corresponding hash value, the corresponding hash value based on a hash value of a previous data block to the data block and on a data record included in the data block.

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:
• obtaining a first attribute value stored in a data record in a blockchain ledger;
• determining location information of the data record in the blockchain ledger, wherein the location information comprises a block height of a first data block in which the data record is located and an offset of the data record in the first data block;
• writing the location information into an index, wherein the index stores a correspondence between the location information and the first attribute value, the first attribute value being used as a primary key in the index;
• receiving a verification instruction comprising a second attribute value and a block height parameter specifying a block interval;
• performing matching in the index based on the second attribute value, to determine corresponding location information identifying one or more data records that include the second attribute value;
• identifying, from the one or more data records that include the second attribute value, a subset of data records that include the second attribute value and are included in the block interval;
• and
• performing integrity verification on the subset of data records,
• wherein each data block in the blockchain ledger after an initial block comprises at least one data record, and
• wherein each data block in the blockchain ledger after the initial block comprises a corresponding hash value, the corresponding hash value based on a hash value of a previous data block to the data block and on a data record included in the data block.