Let's start with definitions:
Cashu - Cashu is a free and open-source Chaumian ecash system built for Bitcoin. Cashu offers near-perfect privacy for users of custodial Bitcoin applications. Nobody needs to know who you are, how much funds you have, and who you transact with. - more info here https://cashu.space/
Cashu-adress - it is a protocol that runs on top of cashu mints. More info here: https://docs.cashu-address.com/
Npub.cash - service that runs on top of cashu-address protocol. Let's you use your npub@npub.cash as a lightning address to receive zaps or incoming sats. More info here https://npub.cash/
Pay to public key - Like bitcoin you can cashu tokens are bearer assets and can be locked to a public key. This means only the person who has the private key can use that token.
What do you use it for? - Use your cash as your lightning address replacement.
Why? I believe everyone knows what a lightning address is. Lightning address is usually provided by your wallet provider who also runs their lightning node. E.g. if you have @alby.com lightning address then you already have an account setup with alby and using their lightning node to get your sats. With you can simply put your npubaddress@npub.cash without registering first or signing up. And you can keep this forever even while changing your lightning wallet from alby to any other provider or running your own lightning node.
Npub.cash locks the received tokens into your nostr public key (Still work in progress) so that only the owner of Nostr public key who has the private key can claim the token and push it to their wallet of choice.
Benefits Over Traditional Custodial Lightning Addresses:
Privacy: With Cashu-Address, your financial activities are not visible to your custodian. This added layer of privacy ensures that your transactions remain your own.
Flexibility in Custodian Selection: Unlike traditional Lightning Addresses, Cashu-Address allows you to choose your custodian freely. If your needs change, you can switch your custodian anytime without hassle.
No User Exclusion: Custodians cannot exclude individual users. Because mints do know know which user eCash belongs to, they can not censor certain users.
How to claim your username@npub.cash - This is what makes it so cool. You can actually get a vanity username for your profile name. E.g. I got mine as starbuilder@npub.cash . Simply visit website and click the get username button. Put in your vanity username and pay 5k sats to get your profile@npub.cash
How to claim your username@npub.cash - This is what makes it so cool. You can actually get a vanity username for your profile name. E.g. I got mine as starbuilder@npub.cash . Simply visit website and click the get username button. Put in your vanity username and pay 5k sats to get your profile@npub.cash
How to claim your username@npub.cash - This is what makes it so cool. You can actually get a vanity username for your profile name. E.g. I got mine as starbuilder@npub.cash . Simply visit website and click the get username button. Put in your vanity username and pay 5k sats to get your profile@npub.cash . This is onetime and you can use this address forever..!
Frequently asked Questions:
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What connect string to use to login with NIP-46 on iOS. - try setting up an account at https://use.nsec.app/home . This is still WIP. If it does not work, just try the Nostr extension using laptop browser
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Is there a notification when I receive sats/zaps? Not yet. We are working on it. However, just go to every couple of days to sweep your collected sats to your wallet
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Which cashu wallet to use? Use enuts (android & ios) https://www.enuts.cash/ or minibits.cash for android https://www.minibits.cash/
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Will anyone be able to claim my sats? NO. When you start the claim process you need to sign with your Nostr extenstion signer to claim sats. So only the person controlling the private key to the can claim sats.
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I really struggle to understand the flow of what happened concretely. - Don't break your head. the devs got you covered. Also, this is super new and everyone is trying to get their heads around. Just follow instructions, play with it and ask for help.
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Is it non-custodial? - When we lock your sats to your pubkey we cannot spend it. However locking to pubkey is not enabled until wallets can start supporting them.
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How do I ask for help? - just post #asknpub.cash and post your questions. We will get to you.
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Who are the devs behind this? @calle (Master of Cashu) @egge (Core dev) @starbuilder (dev support)
Here's what everyone is talking about on Nostr
npub1r0rs5
•
Feb 24, 2024
In case anyone is still confused about nuts or what it means and why we always talk about it (me today haha), here is my know-nothing dummy explanation and why this is a big deal IMO:
Cashu is an ecash protocol(is this correct?) created by @calle 👁️⚡👁️
People are calling them nuts because cashews are nuts... get it?
The terminology is irrelevant. They can be called tokens, air, water, chicken teriyaki.. it really doesn't matter! What matter is that this is a Layer 3 payment system that transfers tokens at the speed of light (or so I think). Lightning being layer 2, and bitcoin being layer 1.
The reason why this is a significant development is because now everyone has a cashu address. Thanks to amazing work by the legendary @Egge , if you go to npub.cash you can see that you already
Cashu is an ecash protocol(is this correct?) created by @calle 👁️⚡👁️
People are calling them nuts because cashews are nuts... get it?
The terminology is irrelevant. They can be called tokens, air, water, chicken teriyaki.. it really doesn't matter! What matter is that this is a Layer 3 payment system that transfers tokens at the speed of light (or so I think). Lightning being layer 2, and bitcoin being layer 1.
The reason why this is a significant development is because now everyone has a cashu address. Thanks to amazing work by the legendary @Egge , if you go to npub.cash you can see that you already
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npub12qpvk
•
Feb 25, 2024
There’s so much technology to learn. I learn on #Nostr every single day. Today I wrapped my head around the Cashu protocol and signed up for an npub.cash address. I also created an account on the Matrix IM
In the meantime, people are making hate posts about religious strife on Facebook 😐
Some people don’t even know what a bubble is, let alone get out of it
#grownostr #plebchain
In the meantime, people are making hate posts about religious strife on Facebook 😐
Some people don’t even know what a bubble is, let alone get out of it
#grownostr #plebchain
See translation
npub15ssy3
•
Feb 25, 2024
The two big benefits of ecash (what cashu uses) are privacy and scalability, of course with some trade offs - namely it is custodial.
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npub1cj8zn
•
Feb 24, 2024
Just claimed walker@npub.cash in preparation for my #BitcoinTalk with @calle 👁️⚡👁️ on Monday 🤙🥜
Can’t wait to talk about Deez Nuts & Other Stuff Transmitted by Relays
@THE Bitcoin Podcast
Can’t wait to talk about Deez Nuts & Other Stuff Transmitted by Relays
@THE Bitcoin Podcast
See translation
npub1az9xj
•
Feb 25, 2024
Getting zapped in nuts it's even more fun!
> nvk@npub.cash
What's your nuts zapping address?
> nvk@npub.cash
What's your nuts zapping address?
npub1cj8zn
•
Feb 24, 2024
Just claimed walker@npub.cash in preparation for my #BitcoinTalk with @calle 👁️⚡👁️ on Monday 🤙🥜
Can’t wait to talk about Deez Nuts & Other Stuff Transmitted by Relays
@THE Bitcoin Podcast
Can’t wait to talk about Deez Nuts & Other Stuff Transmitted by Relays
@THE Bitcoin Podcast
See translation
See translation