ANSI X9.62-2005: Public Key Cryptography for the Financial Services Industry, The Elliptic Curve Digital Signature Standard (ECDSA) (not available online).
ANSI X9.62-2005 was developed for the American National Standards Institute by the Accredited Standards Committee on Financial Services, X9. ANSI X9.62 defines methods for digital signature generation and verification using the Elliptic Curve Digital Signature Algorithm (ECDSA). Specifications for the generation of the domain parameters used during the generation and verification of digital signatures are also included in ANSI X9.62. ECDSA is the elliptic curve analog of the DSA.