code: func (g *GPG) FormatKey(ctx context.Context, id string) string {
  	ent := g.findEntity(id)
  	if ent == nil || ent.Identities == nil {
  		return ""
  	}
  	for name := range ent.Identities {
  		return name
  	}
  	return ""
  }
docs: // FormatKey returns the id