Digital Signatures

Every blockchain transaction rests on digital signatures—the mechanism that lets you prove ownership and authorize transfers without handing over the private key that makes it possible. This chapter works through the signature schemes that make that work: RSA, elliptic curve cryptography, ECDSA, Schnorr, and EdDSA, along with multi-signature schemes, threshold cryptography, and the implementation of pitfalls that trip up real systems. By the end, you will have covered: