public DigitalSignature Update(DigitalSignature update) => Update(DateTime.Now, update);
public DigitalSignature Create(DigitalSignature create) => Create(DateTime.Now, create);
public DigitalSignature Update(DateTime time, DigitalSignature update) => UpdateMany(time, new[] { update })[0];
public DigitalSignature Create(DateTime time, DigitalSignature create) => CreateMany(time, new[] { create })[0];