pub fn secp256k1_params() -> CurveParams<4>Expand description
secp256k1 curve parameters (SEC 2 v2.0 §2.4.1).
y^2 = x^3 + 7 over p = 2^256 - 2^32 - 977. The Bitcoin /
Ethereum signing curve, also widely used in Lightning, Nostr,
and most blockchain ecosystems.