public async Task <Guid> Urn(Guid questionId, string name, byte[][] authorities, KeysPair keys)
{
var exist = urns.SingleOrDefault(o => o.QuestionId == questionId && o.Name == name);
if (exist != null)
{
return(exist.Id);
}
var urn = new Urn
{
Id = Guid.NewGuid(),
QuestionId = questionId,
Name = name,
Authorities = authorities
};
var signer = new Signer(service);
urn.Signature = signer.Sign(urn.GetData(), keys);
urn.PublicKey = new byte[keys.PublicKey.Length];
Buffer.BlockCopy(keys.PublicKey, 0, urn.PublicKey, 0, keys.PublicKey.Length);
await publisher.Add(urn);
urns.Add(urn);
return(urn.Id);
}