A distributed, append-only ledger of transactions secured cryptographically and validated by a network of nodes. Each block references the previous block’s hash, making history tamper-evident. Blockchains can be public (Bitcoin, Ethereum) or permissioned (enterprise variants). The term is overloaded — many things called “blockchain” do not have the decentralisation properties the architecture is designed to provide.
Blockchain
A distributed, append-only ledger of transactions secured cryptographically and validated by a network of nodes. Each block references the previous block's hash, making history tamper-evident. Blockchains can be public (Bitcoin, Ethereum) or permissioned (enterprise variants). The term is overloaded — many things called "blockchain" do not have the decentralisation properties the architecture is designed to provide.
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