Crypto//ECDSA

- Elliptic Curve Digital Signature Algorithm — signs data with private key, verifiable with public key.

Elliptic Curve Digital Signature Algorithm — signs data with private key, verifiable with public key.

Signature + message hash + public key → mathematical proof that the signer holds the corresponding private key.

Used for: transaction signing, block signing, personal message signing (personal_sign)

Infura API keys are NOT ECDSA — they're service authentication tokens, not cryptographic signatures.