Tap-to-pay with CashuBTC ecash — for bitcoin.
Fiat credit cards nailed the UX: fast, offline, works anywhere.
I always wanted that for Bitcoin.
Now it’s open-source. Private. Instant. Beep, done.
In the video: two Cashu wallets for bitcoin.
Left: Minibits (nprofile…6tav) (PoS)
Right: cashu.me (payer)
Ecash is sent directly via NFC — no internet, no delay. Beep, boop.
Ecash is a bearer token — the money lives on your device, not on a server. That’s why it pairs so well with NFC. Pick an amount, tap to send. No talking to servers. No syncing. Just push it over. The payment is pretty much instant. A PoS can accept ecash from any mint and receive payments via Lightning.
Still early days, but we’re experimenting. Card-to-phone works, but phone-to-phone? That’s the real killer use case.
Apple famously locks down the iPhone’s NFC chip — good monopolist.
F*k that. I found a workaround.
As long as one phone (ideally the PoS) is Android, you can send data both ways between iPhone and Android.
(You don’t really own your iPhone.)
Peace!
calle 👁️⚡👁️
npub12r…485vg
2025-03-21 13:46:01
Author Public Key
npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vgPublished at
2025-03-21 13:46:01Event JSON
{
"id": "86f74e7cda4057cbb0ba57ac6f2844354b5bf7506824c3edc3c6db6d9f63b02b",
"pubkey": "50d94fc2d8580c682b071a542f8b1e31a200b0508bab95a33bef0855df281d63",
"created_at": 1742564761,
"kind": 1,
"tags": [
[
"p",
"b33bf9e97b78f35694a02e6bbef8e77059373e42b0a85a63f25a50ebfdadf50d",
"wss://eden.nostr.land",
"mention"
],
[
"r",
"wss://eden.nostr.land/"
],
[
"r",
"wss://hist.nostr.land/"
],
[
"r",
"wss://nos.lol/"
],
[
"r",
"wss://nostr-pub.wellorder.net/"
],
[
"r",
"wss://nostr.bitcoiner.social/"
],
[
"r",
"wss://nostr.mom/"
],
[
"r",
"wss://nostr.oxtr.dev/"
],
[
"r",
"wss://relay.damus.io/"
],
[
"r",
"wss://relay.nostr.band/"
],
[
"r",
"wss://relay.primal.net/",
"read"
],
[
"r",
"wss://relay.siamstr.com/"
],
[
"r",
"wss://relay.snort.social/"
],
[
"r",
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]
],
"content": "Tap-to-pay with CashuBTC ecash — for bitcoin.\n\nFiat credit cards nailed the UX: fast, offline, works anywhere.\nI always wanted that for Bitcoin.\nNow it’s open-source. Private. Instant. Beep, done.\n\nIn the video: two Cashu wallets for bitcoin.\n\nLeft: nostr:nprofile1qy2hwumn8ghj7etyv4hzumn0wd68ytnvv9hxgqg4waehxw309aex2mrp0yhxgctdw4eju6t09uqzpveml85hk78n2622qtnthmuwwuzexuly9v9gtf3lykjsa076magdkt6tav (PoS)\nRight: cashu.me (payer)\n\nEcash is sent directly via NFC — no internet, no delay. Beep, boop.\n\nEcash is a bearer token — the money lives on your device, not on a server. That’s why it pairs so well with NFC. Pick an amount, tap to send. No talking to servers. No syncing. Just push it over. The payment is pretty much instant. A PoS can accept ecash from any mint and receive payments via Lightning.\n\nStill early days, but we’re experimenting. Card-to-phone works, but phone-to-phone? That’s the real killer use case.\n\nApple famously locks down the iPhone’s NFC chip — good monopolist.\n\nF*k that. I found a workaround.\nAs long as one phone (ideally the PoS) is Android, you can send data both ways between iPhone and Android.\n\n(You don’t really own your iPhone.)\n\nPeace!\nhttps://m.primal.net/PnpP.mp4 ",
"sig": "ea6c7dfca3b061021d62d582dae86923fe9fa210b6caa7390762dc25c9b4bf2905d8df7f362063be18d2be8e2d5af47d783c432c5a18b21e39ab20f86ae23078"
}