private async Task <bool> VerifyInstruction(Instruction instruction, ICollection <Transaction> siblings)
{
if (siblings.Any(x => x.Instructions.Any(y => y.InstructionId.SequenceEqual(instruction.InstructionId))))
{
return(false);
}
if (!_signatureService.VerifyInstruction(instruction))
{
return(false);
}
return(!await _instructionRepository.HaveInstruction(instruction.InstructionId));
}