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Definition: ECDSA

(Elliptic Curve Digital Signature Algorithm) A digital signature that is derived using elliptic curve cryptography. A variation of the DSA standard, ECDSA is the cryptographic method used to generate a public key from a private key as well as the digital signature in spendable Bitcoin records known as a "unspent transaction outputs" (UTXOs).

The public key is used to verify that the message, be it a Bitcoin transaction or any other data, was created by the holder of the private key. See elliptic curve cryptography and digital signature.