Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
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Replies (67)
ShaZam Deez 🥜🥜s
Love it!!
นึกถึงแหวนพี่บี @xyzy เลย
อนาคตคงเป็นแบบ เมียโยน ecash ใส่แหวนไปทำงานวันละ 50 sats งี้ แน่ ๆ 🤣
#siamstr
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
🫂
Wtf 🤯
Even if this is a not a regular NFC card, I wonder how is the double-spend solved if you are offline?
It is a regular NFC card and the receiver is online
Which phones are you using for this?
Two pixels
This is nice
But it works with the most Android Phones, right?
And is this a special App?
When will this update come? I'm excited to use this method to use ecash.
Looks cool. Need to learn more about this
Only so much bandwidth in a day
🥜🥜🥜
https://smilemoji.cash to test this out. You'll need a regular NFC card or tag with at least 4Kb of storage.
Please DO NOT use smilemoji.cash as a real wallet because i will take it down once the PR is merged!
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
👀
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
Soon. Meanwhile you can play with it at smilemoji.cash
pretty neat. Also pretty useless for anything other than a giftorang pilling. In a transaction the receiving party would need a phone to verify anyway, and the card would be just another step.
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
Am I misunderstanding or is this putting a copy of the ecash token on the card?
I guess this is good if you arent physically meeting someone but can get them a physical card, avoid encrypt and send via email, or anonymous bearer instrument.
Receiver gets value, and can then reuse the card or keep as a collectible
Thank you, I like this place. #Nostr
Super cool.
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
Oh is it sat not sats?
Hi! You blocked me on X 😢 I saw this today, I guess it’s a fake you:
https://x.com/callebitc/status/1848359949694284236?s=46&t=XWrYg9eiORcaHZrxw2--AQ
I think that twitter/x will now show posts from people that have blocked you but will (still) not let you interact with them.
Satsaphone
Can we play with it yet?
NOT BAD ⚡️
Educate us please 🙏
Love it! As a nut maxi 🌰
Having to Trust someone’s mint is a deal breaker
Will it work offline?
I have built very similar project with LNUrl circa year ago…

GitHub
GitHub - hynek-jina/lotes
Contribute to hynek-jina/lotes development by creating an account on GitHub.
My Flipper is now an ecash wallet. 😎
And the best thing about NFC tags is, they can be added into anything. 🧸
Do NTAG213/215/216 all have sufficient memory for this?
This is amazing but I didn’t understand. The receiver didn’t specify an amount like you would do in a credit card payment. Is this just receive full amount stored in the card 🤔
Dayum
I either came up with something unique or incredibly stupid, can't tell which. 😂
That is actually a really good idea. And you can type the amount and hand over just the ecash notes in that amount. And just mark them as spent locally. Much safer than dumb card which gives everything.
How does one make a flipper app?
This isn't supposed to be a debit card.
It's an ecash note.
I think it's still a valid question and actually the biggest challenge in this current design. Either the card needs brains to do coin selection, or the receiver NFC reader must select the correct amounts it wants to withdraw.
https://smilemoji.cash remember the demo i showed you?
A small gadget with brains + NFC has the potential to be a very cypherpunk ecash hardware wallet. Would love to see this in reality.
Yes, but I didn't realize it was live and I could play with it!
Fuck yes!


Someone in my DMs proposed javacards. They would supposedly be able to do some offline coinselection.
No
Awesome 👏 can’t wait to try it
Probably something similr to this:
Bolt Card
Bitcoin payments over the Lightning Network with a contactless payment card
I'm new to it, but I don't think any dev-type-person would have any problem. They're called FAPs (😆) and they seem to run the code like an APK or something and reference data folders. Most of it gets stored on an SD card.
This is what we need
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Is the same system as bolt cards ?
🥹🥳⚡
👀
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
They'll never be able to keep up with our private cash 😂
Could this technically be done with a Java card?
It would be so much better with a Java card!
I think this could be *so much* better with a smart Java card.
Question: Is it possible that a terminal could tell the card "Hey card, select 2500 sats and send them over"?
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
Prepaid card for the kids. Love it!
Facts
I think that bolt cards uses lnurl
Yes, lnurlw with replay protection.
Woah 🤯
Algo parecido hicimos con las tarjetas #lightning de #lawallet de @La Crypta
Enviar sats ⚡ desde una tarjeta a otra
También un P2P o Arbolito como le llamamos en Argentina en dónde te da dinero Fiat y le cargas su tarjeta
Testing ecash payments with bearer tokens stored on a physical card. You can see the card being topped up with one phone and pay the other. It feels incredibly fast and smooth.
Tap to pay UX with ecash is as good as it gets for payments. You're literally handing over the money.
View quoted note →
What wallet are you using there?
Ok, anyone seen those credit card size calculators?
Imagine that, but there are no buttons, just a low voltage numeric display, slim internal battery, small solar strip, the nfc reader and you have a payment card which visually verifies how many sats it's holding 🤯 now that feels like scifi money!
Cashu.me
Wow this is totally awesome! 😮⚡️🔥