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