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41 sats \ 4 replies \ @rblb 1 Feb \ on: Minibits.cash - Cashu wallet with Lightning-Ecash ⚡ addresses with zaps on nostr bitcoin
Nice! Anyone knows how the "off device backup" works?
I get that the seed is probably the encryption key for the wallet backup, but where is the backup stored?
It's a seed phrase like with Bitcoin, it can be used to regenerate the ecash you might have lost. The only difference is that you need the cooperation of the mint to restore your ecash in the process. Your privacy still remains intact though, the mint just re-issues you what it already issued before.
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Ok thanks for the answer.
Does the mint have a database of the ecash somewhat connected to a seed phrase? My understanding of the cashu protocol is that every ecash is a self contained proof and for this reason it is very hard for a mint to track offline exchanges, but if every issued ecash and every claimed ecash can be traced back to a seed phrase the situation is different as it is like having a virtual account.
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nope, that's exactly the ecash magic! the mint never sees the ecash until it's actually spent. that means, when you restore unspent ecash (even though it is in cooperation with the mint) the mint does not know which token you're restoring.
you can imagine it a bit like as if the mint only has the encrypted token and you are the only one who can decrypt it. after decryption, the mint can't know what encrypted token it corresponded to.
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