reading the spec, do mints need to keep all "spent" secrets forever?

also, is there a way for a 3rd party to audit whether or not a secret was spent?

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Discussion

Yes, and yes!

Anyone can call NUT-07 to check a token state: https://github.com/cashubtc/nuts/blob/main/07.md

1. unbounded state make me nervous, but I guess if the Mint gets a fee from every minting operation, it can adjust the fee to cover the cost of storage.

2. do you think mints should use OTS in case someone contests that a secret was spent?