code: func NewPubring(sec *Secring) *Pubring {
  	return &Pubring{
  		data: &xcpb.Pubring{
  			PublicKeys: make([]*xcpb.PublicKey, 0, 10),
  		},
  		secring: sec,
  	}
  }
docs: // NewPubring initializes a new public key ring