func FromString(s string) (dig BlockDigest, err error) {
if len(s) != 32 {
err = fmt.Errorf("Block digest should be exactly 32 characters but this one is %d: %s", len(s), s)
func FromString(s string) (dig BlockDigest, err error) {
if len(s) != 32 {
err = fmt.Errorf("Block digest should be exactly 32 characters but this one is %d: %s", len(s), s)