func (hash Hash) String() string {
	return hex.EncodeToString(hash[:])
}
String returns the Hash as a hexadecimal string.
package chainhash
import (
	"encoding/hex"
	"fmt"
)
const HashSize = 32
const MaxHashStringSize = HashSize * 2
var ErrHashStrSize = fmt.Errorf("max hash string length is %v bytes", MaxHashStringSize)
type Hash [HashSize]byte