Signature
Also known as: Digital Signature, Cryptographic Signature, Signed Message
A cryptographic proof that validates the authenticity of a message or transaction in blockchain systems.
A signature in blockchain is a cryptographic output generated by a private key to prove that a specific user authorized a transaction or message. It ensures authenticity, integrity, and non-repudiation. Digital signatures allow blockchains to remain trustless, as anyone can verify that a message was signed by a given public key. Popular schemes include ECDSA (used in Bitcoin) and Schnorr (used in Taproot). Signatures are used in wallets, multisig setups, and identity systems. They’re foundational to trustless coordination and smart contract execution.