Too bad eCash on Fedimints and Cashu are not fungible. Then you'd be able to decide what trust model you want to take with your Layer 3 bitcoin. Interoperability between Fedi and Cashu would be awesome.
Ecash on each fedimint or ecash on each cashu is not fungible either. Lightning is the interoperability.
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on the other hand, the fact that they all support lightning deposits and withdrawals is probably close enough to fungibility
you can take your ecash out of a fedimint via lightning and deposit directly into a cashu mint in the same transaction
it's "technically" not the same as fungibility but at this stage it sure feels like it
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