Toy ECDSA explainer shows how elliptic-curve signatures verify without the secret
This is an educational explainer on how elliptic-curve digital signatures (ECDSA) work, using a deliberately insecure toy curve so the signing arithmetic stays small enough to follow. It notes that verification requires only the message and the public key, not the signing secret. There is no market-moving news here; it is background material for understanding the cryptography underpinning crypto wallets and transactions.