Send and recieve ecash using NFC tap cards and Cashu.
@calle
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Amazing video, perfect show case thank you. Do you mind me reposting this?
By all means, go for it.
I really like the idea of ecash - but I really wish they were not a just a very long scary string of characters and digits.
Pretty cool
now they come in cards
That's a fixable UX issue. Our communication right now is just a long string of numbers.
What wallet is it?
Cashu.me
Try out this new feature if you haven't already
which word comes to your mind seeing this?
me: slick
Hello I recently lost 20k sats because of a glitch in 0xchat mint, does anyone know if I can recover that? I used cashu.me wallet, I was paying through lightning, cashu token was spent but lightning btc was never sent. This happened to my friend some time ago as well. I dont know where to ask this so asking under this related post. Any advice?
backed up your seed phrase? restore it
Settings > Seed > Restore
I'm not sure what you mean by "the cashu token was spent" – there is no way to take a token and pay it out on lightning in cashu.me. You just pay lightning invoices.
What's often the case is that the lightning invoice is stuck and then your ecash is also stuck. This has to do with Lightning, usually it resolves itself automatically though. Take your invoice and ask the mint operator, will see if it was ever paid.
I meant that the 20k was gone from my balance and when I copy the ecash token from history and try to redeem it, it says the token is spent.
The invoice that was supposed to be paid wasnt paid and both me and the receiver confirmed that it wasnt paid.
I haven't heard of anything like that ever happening. You'll have to ask the 0xchat mint if they can see the outgoing invoice or not.
Which NFC card is that?
Cheapest (and coolest looking as a bonus) ones I could find that had at least 500 bytes of storage.
"Timeskey" was the brand.
30 cards for $20 on Amazon.
You sent and received 64 sats.
Would it be possible to send eg 64 sats to the card and receive for example 20 sats?
How many tokens can you store on a ~ 500 bytes card?
Cool! Thank you for the video.
Yes also curious about the overall size needed?
The cards I have can store any low 2^x (64 wasn't a random choice).
If the number of sats was written in binary... And if it only needs one ...1. 1,2,4,8,16,32, etc... It seems to use ~246 bytes.
If you need two binary 1's, such as 3, 5, 6, 9 uses just under 400 bytes.
If it needs 3 binary 1's (7, 21) it blows over the 500 byte limit of those cards at ...526 bytes.
The number 256 is fine at 246 bytes, but 255 (which requires 8 binary 1's) needs 1.257 MB.
The 2-to-the-power-of-trick, breaks down at 512 as that now needs over 500 bytes too.
Hello, please check your gift-wrapped DM i sent you a few days ago. I don't use normal DMs that leak metadata.
Cashu dot me wallet allows you to load and receive ecash NFC cards.