There are shitcoins that compress the entire state of their “blockchain” into 32 bytes. That’s pretty insane tbh. I think we can do the same for Cashu at some point in the future.
Discussion
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Isn't that just a hash of all previous state?
Nope, it’s an accumulator of all spent coins.
Nano?
This is possible on Bitcoin (without anything more fancy than merkle trees), see Utreexo.
Yes, and it’s a funny inversion of the same approach in that we track unspent outputs with utreexo whereas these other accumulators track the spent ones (that’s what we would have to do with Cashu, since the unspent ones aren’t known / we’re blind-signed).