Just put the MasterCharge payment algorithm on ethereum contract

 As simple as that.

The MasterCharge system creates a key word for the transaction which is a valid claim on Master Charge for a short period.  The keyword is short chain cash. As long as all participants utilize the MasterCharge payment algorithm, they can pass it around, as a cash redeemable on the Swift ledger.

We add making change to the payment algorithm. We make the keyword ledger viewable by all, and block chained with customer pass codes. And, it resolves, certainly. In other words, no one is using these stupid keys to store value, it is in fact what the SEC calls it, a security, a pure equity, as pure as a master charge payment algorithm can make it. 

Making short chain simply means miners agree on payment termination, return to a fund to public ledger and erase the chain on count or time limit.