Imports github.com/btcsuite/btcd/blockchain github.com/btcsuite/btcd/btcec github.com/btcsuite/btcd/chaincfg github.com/btcsuite/btcd/chaincfg/chainhash github.com/btcsuite/btcd/txscript github.com/btcsuite/btcd/wire github.com/btcsuite/btcutil Standard library imports bytes encoding/binary encoding/hex errors fmt math math/big runtime time