Imports github.com/btcsuite/btcd/btcec/v2 github.com/decred/dcrd/dcrec/secp256k1/v4 github.com/decred/dcrd/dcrec/secp256k1/v4/ecdsa github.com/zhiqiangxu/pktweak-type Standard library imports crypto/ecdsa crypto/elliptic crypto/rand errors fmt math/big