I considered this and chose against it. Showing this is incredibly messy. If the user wants to send then they have to mess around trying to figure out how to make up 72 with the coins they have, it's just not good UX. Users can have a lot of different "coins" and peoples fingers are fat, the buttons need to be small. It's just not good experience. Two buttons is way better, if the user trusts they wallet they should trust it to tell them what they can and can't do.

No internet? No problem. With you can send ecash offline for specific amounts. For fiat-denominated payments, in we will automatically select the closest sat value that can be sent offline. This is almost always within <$0.01 of the intended amount—so small that its not meaningfully different.

Do you have any suggestions? The best I can do is give a short explanation in the model, most wallets will just fail if you try to do this which is even more confusing. In my opinion this is the best UX of any ecash wallet at the moment for this specific scenario.

Something we’re adding to this: if you send $10, the wallet will automatically try to pick a sat amount that’s spendable offline. A penny is ~15 sats right now, so we can adjust by ~±8 sats without meaningfully changing the dollar value. If that still doesn’t produce an offline-spendable amount, we can show a popup offering a wider range (usually just a couple pennies). Feels like a nice UX compromise since people sending dollars don’t care about the 8th decimal place of BTC. Thoughts?

I’ve been working on a new offline send flow for . With , offline sends are possible, but only for specific denominations. Our approach lets users choose whether to round up or round down to the nearest valid amount, making it easier to adapt the send amount for offline use while still giving users a bit more control. I chose this approach instead of building a proof selector. In my testing, proof selection felt much more complicated for normal users. With this flow, the wallet automatically calculates the proofs needed behind the scenes.

working on a better offline send ux for cashu

i freaking love working on ecash ux its so much fun

my tech stack: