Imports github.com/Messer4/btcd/btcec github.com/Messer4/btcd/chaincfg github.com/Messer4/btcd/chaincfg/chainhash github.com/Messer4/btcutil github.com/Messer4/btcutil/base58 Standard library imports bytes crypto/hmac crypto/rand crypto/sha512 encoding/binary errors fmt math/big