yes, they are compatible -- with this, if you try to zap someone that doesn't have a cashu wallet announced it will do a regular bolt11 zap from the cashu balance
(how cool is that?!)
yes, these are pubkey-locked cashu tokens, locked to the pubkey of the npub with a "02" prefix for parity
so the proofs are actually unencrypted, anyone can verify them, but only the recipient can swap them
Ah, cool. So its the same cashu stuff me and nostr:npub1rw7hlhmgat6ur9zxcw40vweem49guv6530yk767j8xjpynv0y20q6qsl3w played around with :)
what about receiving? does it use some kind of cashu<->lightning address gateway for zaps by people who use a client that does not understand cashu zaps?
Not yet, but I will probably write one; the beauty is that it doesn’t need to take custody at any time; you respond to an LNURL request with the mint’s bolt11, so it’s extremely lightweight
I think there are open source gateways already, no need to write a new one. It should just be setup during onboarding in the profile.
They don’t do the new spec, they just send you unlocked ecash via a dm
Is there a writeup of how Cashu pubkey-locking works? nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg
Ah, so the lock is initiated by the mint, not on the user’s Cashu client? Cause I was wondering how to prevent double spending.
It's initiated by the sending user but it's enforced by the mint.
Ah, so there is an http request from the sender to the mint before the nut zap. It sounded like magic to zap the ecash via nostr w/o any roundtrips to the lightning node.
That only works for unlocked tokens. You can zap someone an unlocked but encrypted token and that should work without talking to the mint. However, then it becomes less publicly verifiable.
Interesting. I was wondering why npub.cash doesn’t just send me an unlocked token via nostr DM when I receive a zap to my lightning address. I guess this is the UX that Pablo’s spec enables. But it also combines the Cashu wallet seed and the Nostr nsec as a single secret.
npub.cash does not do this, because I did not get to implement it yet.
Also it was always meant to be an API service that is more hidden from the user. Like giving a Lightning address to a Cashu wallet and claiming the nuts automatically
Makes sense. Just my 2 sats worth… as a developer I’m more likely to integrate an API that delights me as a user first.
