Biometrics cost

 We need biometrics at home

Now a good finger vein and print combo is about $200.  One you keep at home has to be a complete counterfeit proof Smart Card. But you everyday card need only store our biometrics, and it needs a pass code. In this model ever household should have one secure vein and print machine, like a house hold utility. Advanced smart card are thicker, like a slim ipod, and can hold a vein and print detector. But they will cost in the hundreds.   If you have a few thousand in the money market then you have a trading bot in the cloud and it needs full biometrics from you. I needs to know a secure line direct to you, the account holder. That means a full biometrics system at home.

Fingerprint Recognition	Medium	Low	Small	Low	Low
Finger Vein	High	Medium	Medium	High	High

You card can carry up to two hundred with nothing but a pass code. Like current ATMs.  But no matter where you take the card, it remembers all your biometrics and will verify them on your command.  

To initiate a trusted miner to manage your hot account in the pits, the bot has to verify your card is legal.  Your card has to generate a key the the foundry can validate uniquely. Once he card is validated then is will not double spend and it is valid until expiration date.  The rusted miner is your trading bot in the pit, and it still wants your biometrics from home or office on a timeout basis.  Your card and your trading bot are sharing bearer cash. Or in the stable coin method, you and your trading bot are sharing a short chain of  sharded cash.  In the pits it is sill bearer cash, off and on the trade board.  The pit boss runs a short chain shard and any money entering goes from the source to the local shard.  Most of the money in os from various spare cash shards, but all of the same monetary system.  The pit boss just does an account transfer from one shard to its own account. I needs no short chain, it uses the structured betting queues.  All accounts provable, so on ei the pit boss subtracts from its account and adds to the customer account.  basically it delivers the authorization to your trusted miner that knows if you want your money on ledger, shot chain or bearer cash. Or your trusted miner can chain contracts and bet the gold market, for example. All monetary systems should support the standard ledger swap.

The provable method on contracts

Treat half the exchange as bearer cash fr proofing, Then if bearer cash is not available, find the substitute, and prove that ledger swap to some bound probability. It will be a chained contract.  The bearer cash assumption serializes, any stable point in contract is  dependent on one market outcome, no conditionals. Then to adjust for the no bearer cash condition, another contract chain is needed, thus separating the conditionals onto separate, distinct paths.

If you go though the proofs on this you find that this method is spectre safe, there is no race condition on opening the cache based in an external response.  Like the case when you wait for confirmation, but another process cancels within timeout. Provability means the contract is never in that lock. That would show up as a loop in any finite semantic net representing the chained contract.