When your smart card expires

 It does not die, it is simply executing  contract made by the Fab.

You take you card to an ATM, select renew, put your thumb on the card, insert bth into the shelf. The ATM takes your thumb print and pic and verifies with the account issuers, and renews the card.  It is really a contacted promise on currency regimes, to eventually flush bearer assets back to the ledger.  

This is a really good contract, well worth the Fab fee they will charge. It always tends to remove liability from sandbox, as a network, it puts a limit to scofflaw exchanges, and is an ultimate guarantee for every contract managed by the card.  It is a Spectre requirement.

Gold certificates, for example. They do not have indefinite life in the instruction caches.  The certificates ultimately required to check the old vaults.  And dead people do not take bearer assets to the sea bed. And ultimately, clears the asset networks of over congestion.

The Fab plays the lead role here, and by definition of security, the Fab runs a secret message system, it has a 'coin' by default. Its own methods of cache security are inherited by the diffferent currency regimes. Or more broadly, asset regimes in the instruction cache. Each contract as secure as the fab security, and that is what fab sells, security and flexibility in optimum proportion. A great business model, the value added of the Fab is that they work out details of government demands, prior contract dealing with the when and if government demands.  A very short contract chain, card to Fab works well.