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.

Replies (67)

นึกถึงแหวนพี่บี @xyzy เลย อนาคตคงเป็นแบบ เมียโยน ecash ใส่แหวนไปทำงานวันละ 50 sats งี้ แน่ ๆ 🤣 #siamstr
calle's avatar calle
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 →
x's avatar
x 1 year ago
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!
calle's avatar calle
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 →
👀
calle's avatar calle
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 →
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.
calle's avatar calle
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
Super cool.
calle's avatar calle
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 →
I think that twitter/x will now show posts from people that have blocked you but will (still) not let you interact with them.
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 🤔
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?
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.
A small gadget with brains + NFC has the potential to be a very cypherpunk ecash hardware wallet. Would love to see this in reality.
x's avatar
x 1 year ago
Someone in my DMs proposed javacards. They would supposedly be able to do some offline coinselection.
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.
👀
calle's avatar calle
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 →
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"?
calle's avatar calle
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 →
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
calle's avatar calle
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 →
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!