One Cashu wallet sends Ecash to another via NFC — no internet, no delay.

Ecash is a bearer token, so the money lives on your device, not a server.

That’s what makes NFC magic: instant, offline Bitcoin transfers.

Via nostr:npub12rv5lskctqxxs2c8rf2zlzc7xx3qpvzs3w4etgemauy9thegr43sf485vg

https://video.nostr.build/a2482bbaecc53bcc28c1bab0f47a5e55d899dccb17c176474d93197cf2efcadc.mp4

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Discussion

How does Ecash work with bitcoin? Is it 1 sat = 1 Ecash?

I think it depends on the mint policy. The cashu protocol seems to be suited to work well on top of Bitcoin/ LN, but you have to trust the ecash mint to really own the underlying Bitcoins

Okay. Mmh. Okay. But would I then could do the same transaction with someone else, offline .. that uses another mint?

Or do I totally misunderstand this?

Afaik no you couldn't

The mint to mint transfer are done through lightning so you need online devices

Okay, so could you in theory have a city mint. And everyone using this city mint, could go around the city without internet for a whole day and pay each other?

Curious, don't mean to sound rude:

Offline how? Both of the devices in this video are connected to WiFi? Or you're strictly talking about the string of text (token) being sent offline?

Either way, the future looks hella exciting.

Between this, atms, satcards... it's nice to see everyday people building tech for bank replacement even at the edge.

#ThisIsTheWay

The “offline” was in the description of NFC. Not related to the phone being on wifi.

?.. don’t get it. So, would it still work without any internet access = meaning without wifi and no SIM/eSIM cards in both phones?

The sending of the token would. Any verification serverside no.

… until one of them has internet access at some point??? Then does it synch?

It will recheck token status ... Someone else correct me if I'm mistaken

Really impossible for normies to use even if it’s cool … i did not even get the if this meant without internet access or off the layer 1 chain.??!? ⛓️‍💥

Well I'd dare call it layer 2.5

It uses lightning, but I don't think it's really another layer in and of it itself.

Ok. And 2 parties can use it without having any kind of connection to the internet 🛜 ? Basically using mobile phones with broken wifi components and no sim cards?

I'm gonna have to leave this one for someone more familiar. I don't want to give you bad info.

So cool

Does this work from Android to iOS? 🤔

I’ve been using wallet of satoshi for ever , it always had a NFC scan

https://m.primal.net/PsXb.mov