gistfile1.txt

* types/tx.go:

** No import(...) no topo do arquivo, adicionar:

	"github.com/ethereum/go-ethereum/crypto"

** E logo abaixo:

// Hash computes the TMHASH hash of the wire encoded transaction.
//
//    func (tx Tx) Hash() []byte {
//        return tmhash.Sum(tx)
//    }
func (tx Tx) Hash() []byte {
    return crypto.Keccak256(tx)
}

//    func (tx Tx) Key() TxKey {
//        return sha256.Sum256(tx)
//    }
//
// Key returns the Keccak256-based fixed-length key for indexing.
func (tx Tx) Key() TxKey {
    var key TxKey
    copy(key[:], crypto.Keccak256(tx))
    return key
}

* go.mod:

** Adicionar no primeiro grupo de require(...):

   github.com/ethereum/go-ethereum v1.14.12
   
** Ir no cmd line e digitar:

   go mod tidy