Imports github.com/btcsuite/btcd/btcec github.com/ethereum/go-ethereum/common github.com/ethereum/go-ethereum/common/math github.com/ethereum/go-ethereum/crypto/secp256k1 github.com/ethereum/go-ethereum/rlp golang.org/x/crypto/sha3 Standard library imports crypto/ecdsa crypto/elliptic crypto/rand encoding/hex errors fmt io io/ioutil math/big os