Subnostr

# Cashu over Nostr

There are two Cashu wallets with nostr capabilities right now: Nutshell (CLI, for pros) and Nutstash (beginner-friendly web wallet).

## How does it work?

In Cashu, you exchange ecash tokens (represented as a long random-looking string) denominated in Satoshis that you can redeem on Lightning with the help of a mint (the custodian).

You can send these tokens directly (and privately!) to another user's nostr pubkey (or nip05 like mine: calle@cashu.me). The tokens then show up in the receivers nostr DMs. When the receiver uses one of the above wallets, the wallets automatically scan your DM inbox for incoming tokens. When a token is received, it is automatically redeemed into your wallet.

That's it! Encrypted DMs on an uncensorable social network paired with an untraceable privacy layer for custodial Bitcoin wallets. It's a perfect match 💜

Better to try it yourself to see how slick it is when a token just pops up in your wallet: https://wallet.nutstash.app

With nutshell: $ cashu send 69 -n calle@cashu.me

Receive: $ cashu receive -n

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Discussion

calle 2y ago

#[1] this is also for you 😘

DETERMINISTIC OPTIMISM 🌞 2y ago

Very cool. I will save it to checkout

faisal 2y ago

Does the mint or wallet provider have access to unencrypted nostr*cashu data?

calle 2y ago

No! The wallet runs on your device and the mint doesn't know about any of this.

faisal 2y ago

I could see a scenario where it becomes the defacto zapping method here… What would even be nicer is having mobile wallets that can do ln and ecash…

Sound Money 2y ago

#[0]

Rsync🦀 2y ago

😍🤯

Ronin 2y ago

If i mint tokens in mintA the receiver can only redeem in MintA i assume, does he have to know previously which mint the tokens belong?

calle 2y ago

Good question and we already thought of that: the token itself includes information on how to reach the mint it is from.

A wallet should then ask you if you want to trust that mint before you accept the token.

Big Barry Bitcoin 2y ago

When you want to claim a token, afaik, you expose your IP to the mint.

I saw a video where Ben Arc was demo'ing nostr markets. He used nostr as a messaging layer for receiving orders.

This has me thinking... Is it worth doing the same by giving the mint an official nostr account?

You can then (statistically) more anonymously redeem a token with secure messaging.

calle 2y ago

We're working on that 👀

https://github.com/schulterklopfer/nostrest/

Azz 2y ago

There is probably no 100% safe way.

But look into this

#[1]