code: func (p *AllIssuingValidator) Validate(creator identity.PublicInfo, tokenType string) error {
  	// Deserialize identity
  	identity, err := p.Deserializer.DeserializeIdentity(creator.Public())
  	if err != nil {
  		return errors.Wrapf(err, "identity [0x%x] cannot be deserialised", creator.Public())
  	}
  
  	// Check identity validity - in this simple policy, all valid identities are issuers.
  	if err := identity.Validate(); err != nil {
  		return errors.Wrapf(err, "identity [0x%x] cannot be validated", creator.Public())
  	}
  
  	return nil
  }
docs: // Validate returns no error if the passed creator can issue tokens of the passed type,, an error otherwise.