Photo Illustration by Luis G. Rendon/The Daily Beast/GettyA 76-year-old retiree was zip-tied and held hostage in his North Carolina home by a pair of bogus utility workers who traveled from Florida to drain—at gunpoint—the contents of the man’s cryptocurrency account, which the alleged mastermind of the scheme apparently worried would be substantial enough to attract the attention of the FBI.That’s according to a criminal complaint unsealed Thursday and obtained by The Daily Beast, which charges