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 (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!