You can audit how much the mint has on-chain but you can't verify how much ecash has been issued. This is kind of an impossible problem because ecash is basically just a signature, there is no way to stop the federation from creating signatures without you knowing.
how do signatures work, is each ecash token signed by all guardians? or could guardians check number of every other guardians signatures, and see if there are discrepancies between each other?
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It’s an aggregate sig by the federation.
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ah, but guardians incentivised to not have their mint implode, so even that wouldn't work would it
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