Obtaining blockchain data in stages

1. A computer-implemented method for obtaining blockchain data of a blockchain in multiple stages, the method comprising:

receiving, by a first node device of a blockchain network comprising a plurality of node devices and a client device, a data request from the client device, wherein:

a distributed database of the blockchain stores target data; and

the data request comprises a first data position identifier that identifies a first position, within the distributed database, of a first portion of the target data;

obtaining the first portion of the target data from the distributed database based on the first data position identifier;

generating a second data position identifier for a second portion of the target data based on the first portion of the target data, wherein the second data position identifier identifies a second position, within the distributed database, of the second portion of the target data and enables the client device to continue to obtain one or more additional portions of the target data including the second portion of the target data from any one of the plurality of node devices; and

sending the first portion of the target data and the second data position identifier to the client device.

2. The computer-implemented method of claim 1 , wherein:

the first data position identifier identifies a starting position of the first portion of the target data, wherein the data request further comprises a capacity of the first portion of the target data; and

obtaining the first portion of the target data based on the first data position identifier comprises:

obtaining the first portion of the target data based on the first data position identifier and the capacity of the first portion of the target data.

3. The computer-implemented method of claim 2 , wherein:

the target data comprises list data in a list of data; and

the capacity of the first portion of the target data comprises (i) a number of entries in the list that is included in the first portion of the target data (ii) or a size of space occupied by the first portion of the target data.

4. The computer-implemented method of claim 3 , wherein the first data position identifier is a unique identifier generated based on a last entry of the list data included in the first portion of the target data.

5. The computer-implemented method of claim 3 , wherein the list data comprises a hash value of a transaction stored in the distributed database of the blockchain as ledger data.

6. The computer-implemented method of claim 1 , wherein the blockchain is a consortium chain, the first node device is a consortium chain node device, and the client device comprises a user client connected to the consortium chain node device.

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

receiving, by a first node device of a blockchain network comprising a plurality of node devices and a client device, a data request from the client device, wherein:

a distributed database of a blockchain of the blockchain network stores target data; and

the data request comprises a first data position identifier that identifies a first position, within the distributed database, of a first portion of the target data;

obtaining the first portion of the target data from the distributed database based on the first data position identifier;

generating a second data position identifier for a second portion of the target data based on the first portion of the target data, wherein the second data position identifier identifies a second position, within the distributed database, of the second portion of the target data and enables the client device to continue to obtain one or more additional portions of the target data including the second portion of the target data from any one of the plurality of node devices; and

sending the first portion of the target data and the second data position identifier to the client device.

8. The non-transitory, computer-readable medium of claim 7 , wherein:

the first data position identifier identifies a starting position of the first portion of the target data, wherein the data request further comprises a capacity of the first portion of the target data; and

obtaining the first portion of the target data based on the first data position identifier comprises:

obtaining the first portion of the target data based on the first data position identifier and the capacity of the first portion of the target data.

9. The non-transitory, computer-readable medium of claim 8 , wherein:

the target data comprises list data in a list of data; and

the capacity of the first portion of the target data comprises (i) a number of entries in the list that is included in the first portion of the target data (ii) or a size of space occupied by the first portion of the target data.

10. The non-transitory, computer-readable medium of claim 9 , wherein the first data position identifier is a unique identifier generated based on a last entry of the list data included in the first portion of the target data.

11. The non-transitory, computer-readable medium of claim 9 , wherein the list data comprises a hash value of a transaction stored in the distributed database of the blockchain as ledger data.

12. The non-transitory, computer-readable medium of claim 7 , wherein the blockchain is a consortium chain, the first node device is a consortium chain node device, and the client device comprises a user client connected to the consortium chain node device.

13. 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 operations comprising:

receiving, by a first node device of a blockchain network comprising a plurality of node devices and a client device, a data request from the client device, wherein:

a distributed database of a blockchain of the blockchain network stores target data; and

the data request comprises a first data position identifier that identifies a first position, within the distributed database, of a first portion of the target data;

obtaining the first portion of the target data from the distributed database based on the first data position identifier;

generating a second data position identifier for a second portion of the target data based on the first portion of the target data, wherein the second data position identifier identifies a second position, within the distributed database, of the second portion of the target data and enables the client device to continue to obtain one or more additional portions of the target data including the second portion of the target data from any one of the plurality of node devices; and

sending the first portion of the target data and the second data position identifier to the client device.

14. The computer-implemented system of claim 13 , wherein:

the first data position identifier identifies a starting position of the first portion of the target data, wherein the data request further comprises a capacity of the first portion of the target data; and

obtaining the first portion of the target data based on the first data position identifier comprises:

obtaining the first portion of the target data based on the first data position identifier and the capacity of the first portion of the target data.

15. The computer-implemented system of claim 14 , wherein:

the target data comprises list data in a list of data; and

the capacity of the first portion of the target data comprises (i) a number of entries in the list that is included in the first portion of the target data (ii) or a size of space occupied by the first portion of the target data.

16. The computer-implemented system of claim 15 , wherein the first data position identifier is a unique identifier generated based on a last entry of the list data included in the first portion of the target data.

17. The computer-implemented system of claim 15 , wherein the list data comprises a hash value of a transaction stored in the distributed database of the blockchain as ledger data.

18. The non-transitory, computer-readable medium of claim 13 , wherein the blockchain is a consortium chain, the first node device is a consortium chain node device, and the client device comprises a user client connected to the consortium chain node device.