ECDSA

Message = e = z is not the Transaction ID/hash!
Correctness of the Algorithm

[["Standardized Curve, named curves", "bits", "Notes"], ["secp256k1", "256", "BTC"], ["Curve25519", "256", "flashcoin, XMR"], ["Dual_EC_DRBG", "", "compromised?"]]

Signing
Verification
Case 1: Infamous Pizza Order
Case 2
Case 3