Tehnologia blockchain

Blockchain, originally called block chain, is an ever-growing list of records called blocks that communicate with each other through encrypted messages. Each block contains a cryptographic hash of the previous block, a timestamp, and the transaction data. By design, a blockchain is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way," typically managed by a peer-to-peer network that adheres to a protocol for communication between nodes and validating new blocks. Once recorded, the data in a given block cannot be changed retroactively without changing all subsequent blocks, which requires network consensus