The card can prove human and chip (bio/thermal)metrics
The car can create and share a secret key up to published security level.
The card will not double end cash that it identifies as cash.
The card will leave cash timeout predetermined at fab master. The fab master kernel code considers this to be Spectre compliance, provable in the kernel code.
The connections from these simple cards rules to complex contracts are the ease of making one side a cash transaction. Cash is automatically Spectre compliant, so, with a timeout, it can be held until some condition is met, externally. This greatly simplifies provability every where, there is a card to card hand shake to rely on. The chip vendors guarantee the cash identity protocol to some published limit. All of this doable, provable, workable and cheap.
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