The technology underpinning bitcoin and other cryptocurrencies is known as blockchain. This decentralized digital ledger records all transactions across a network of computers. Each block contains a list of transactions and is linked to the previous block, forming a secure chain. The consensus mechanism, such as Proof of Work or Proof of Stake, ensures the integrity of the transactions. Blockchain allows for transparency, security, and eliminates the need for intermediaries, enabling peer-to-peer transactions.