My smart phone has secure personal ID, it can agree not to double spend and to obey the access protocol for the Swift ledger. My smartphone is a Swift bank.
My Smartphone can hold bearer digits, in dollars. I can touch your smartphone and give youthree dollars, you can touch the clerks smartphone and by me six bananas, no central bank yet involved, we are the central bank. The difference is that my mini Swift bank cannot run a Swift S/L; that is a ledger restriction, I am cash only. If I want to run an S/L in Swift dollars I need an upgrade. Bt tthat is mostly about extra security for the network based hot wallet.
Kind of like a real wallet? Anyone? So we can see the model is expandable across partitioned ledger systems, if we have ledger swaps. There are a set of ledger/base contracts that must be 'filled in' for proofing, then you are good to go, blockchain, ethereum, swift. The ledger swap contract must be part of the monetary installation, even if null. Most of the proofs center around making swaps work.
Include in the capability are any specialized contracts associated with non monetary apps, and that list is long and useful. But these 'wallet' abstractions are completely outside money systems, though they may have cunts and timeouts on other transactions and rely on the same set of contract proofing.
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