The simple method.
The card operates on encrypted keys, and is able to send data set, once, encrypt to any other like card/ So just create a bitcoin address and secretly pass the signature around. The top contract of the card secures the cash. One can even crate a simple cash splitting contract extension. A contract is one stable, spectre compatible moment, defined as a moment when the instruction cache can be swapped, there are no pending conditions. All contract accounts , except cash, are on public ledger.
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