lnbits-legend/lnbits/extensions/withdraw

LNURLw

Create a static QR code people can use to withdraw funds from a Lightning Network wallet

LNURL is a range of lightning-network standards that allow us to use lightning-network differently. An LNURL withdraw is the permission for someone to pull a certain amount of funds from a lightning wallet.

The most common use case for an LNURL withdraw is a faucet, although it is a very powerful technology, with much further reaching implications. For example, an LNURL withdraw could be minted to pay for a subscription service. Or you can have a LNURLw as an offline Lightning wallet (a pre paid "card"), you use to pay for something without having to even reach your smartphone.

LNURL withdraw is a very powerful tool and should not have his use limited to just faucet applications. With LNURL withdraw, you have the ability to give someone the right to spend a range, once or multiple times. This functionality has not existed in money before.

Wallets supporting LNURL

Usage

Quick Vouchers

LNbits Quick Vouchers allows you to easily create a batch of LNURLw's QR codes that you can print and distribute as rewards, onboarding people into Lightning Network, gifts, etc...

1. Create Quick Vouchers
   
   • select wallet
   • set the amount each voucher will allow someone to withdraw
   • set the amount of vouchers you want to create - have in mind you need to have a balance on the wallet that supports the amount * number of vouchers
2. You can now print, share, display your LNURLw links or QR codes
   
   • on details you can print the vouchers
     
   • every printed LNURLw QR code is unique, it can only be used once
3. Bonus: you can use an LNbits themed voucher, or use a custom one. There's a template.svg file in static/images folder if you want to create your own.
   

Advanced

1. Create the Advanced LNURLw
   
   • set the wallet
   • set a title for the LNURLw (it will show up in users wallet)
   • define the minimum and maximum a user can withdraw, if you want a fixed amount set them both to an equal value
   • set how many times can the LNURLw be scanned, if it's a one time use or it can be scanned 100 times
   • LNbits has the "Time between withdraws" setting, you can define how long the LNURLw will be unavailable between scans
   • you can set the time in seconds, minutes or hours
   • the "Use unique withdraw QR..." reduces the chance of your LNURL withdraw being exploited and depleted by one person, by generating a new QR code every time it's scanned
2. Print, share or display your LNURLw link or it's QR code
   

LNbits bonus: If a user doesn't have a Lightning Network wallet and scans the LNURLw QR code with their smartphone camera, or a QR scanner app, they can follow the link provided to claim their satoshis and get an instant LNbits wallet!