Imports github.com/btcsuite/btcd/btcec/v2 github.com/btcsuite/btcd/btcec/v2/ecdsa github.com/btcsuite/btcd/btcutil/bech32 github.com/dchest/blake2b github.com/decred/dcrd/dcrec/secp256k1/v4 Standard library imports bytes crypto/ecdsa crypto/rand encoding/hex errors fmt math/big