docs: clarify secp256k1 is uncompressed
@@ -35,6 +35,8 @@ impl std::str::FromStr for CurveType {
/// Public key in a binary format with base58 string serialization with human-readable curve.
/// The key types currently supported are `secp256k1` and `ed25519`.
///
+/// Ed25519 public keys accepted are 32 bytes and secp256k1 keys are the uncompressed 64 format.
+///
/// # Example
/// ```
/// use near_sdk::json_types::Base58PublicKey;
