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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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Ecash on each fedimint or ecash on each cashu is not fungible either. Lightning is the interoperability.