What is a Blockchain ? What is a blockchain?Why trust is a fundamental issue in human relationsThe characteristics of a blockchainHow a blockchain works: consensus & A blockchain is a new way to store data. Rather than centralising information, and the control over it, in one place (a database), blockchains store it across a network where no one point has the authority to change records, This is called decentralisation..Blockchain's record data - in blocks - and securely store this data by chaining those blocks together using cryptography, hence a block-chain. Satoshi Nakamoto - the alias of the individual or group