public override bool ValidateContextual(ParticipantHandler participantHandler, List <Chain> chains)
{
var ret = participantHandler.HasSender(SenderAddress) &&
ValidateTransactionIntegrity(participantHandler.GetSenderKey(SenderAddress));
ret &= participantHandler.HasSender(PhysicianAddress) && participantHandler.HasPatient(PatientAddress);
return(ret);
}