func UnmarshalSecp256k1PrivateKey(data []byte) (PrivKey, error) {
	if len(data) != btcec.PrivKeyBytesLen {
		return nil, fmt.Errorf("expected secp256k1 data size to be %d", btcec.PrivKeyBytesLen)
	}

	privk, _ := btcec.PrivKeyFromBytes(btcec.S256(), data)
	return (*Secp256k1PrivateKey)(privk), nil
}
func UnmarshalSecp256k1PrivateKey(data []byte) (PrivKey, error) {
	if len(data) != btcec.PrivKeyBytesLen {
		return nil, fmt.Errorf("expected secp256k1 data size to be %d", btcec.PrivKeyBytesLen)
	}

	privk, _ := btcec.PrivKeyFromBytes(btcec.S256(), data)
	return (*Secp256k1PrivateKey)(privk), nil
}
func UnmarshalSecp256k1PrivateKey ( data [ ] byte ) ( PrivKey , error ) { if len ( data ) != btcec . PrivKeyBytesLen { return nil , fmt . Errorf ( " " , btcec . PrivKeyBytesLen ) } privk , _ := btcec . PrivKeyFromBytes ( btcec . S256 ( ) , data ) return ( * Secp256k1PrivateKey ) ( privk ) , nil }
// UnmarshalSecp256k1PrivateKey returns a private key from bytes
UnmarshalSecp256k1PrivateKey returns a private key from bytes