FIELD

The disclosure generally relates to data storage technology.

BACKGROUND

A blockchain, which is a general ledger database that exists on a peer-to-peer network in multiple copies, is a way of storing data. It has the characteristics of collective maintenance and decentralization, and data in the blockchain cannot be tampered with.

Taking Bitcoin technology as an example, full-featured nodes (i.e. each user terminal) maintain the same ledger, and transactions worldwide are recorded entirely on the same ledger, the Bitcoin ledger has reached more than 150 gigabytes so far. When user needs to establish a Bitcoin node, it is necessary to download the ledger of more than 150G to synchronize the ledger, which takes a lot of time. The ledger being large also means that searching for transaction records can be slow.

