Method and system to discharge a liability associated with a proprietary currency

A method and an apparatus to discharge a liability owed to a buyer and stored in a first proprietary currency. The apparatus receives authorization from the buyer to tender the first proprietary currency to pay for an offering that is listed by a seller on a network-based marketplace. The apparatus transmits a national currency to the seller who receives the national currency as payment for the offering. The transmission at least partially discharges the liability owed to the buyer.