区块链
A shared, append-only ledger where transactions are grouped into cryptographically linked blocks.
A blockchain is a database that many computers hold copies of at the same time. Transactions are bundled into blocks, each block carries a cryptographic fingerprint of the one before it, and that chain of fingerprints makes past records practically impossible to alter without the network noticing.
Because every participant validates the same rules, no single operator has to be trusted to keep the ledger honest. This is what allows value to move between strangers online without a bank sitting in the middle.