LNURLw - LNbits extension

For more about LNBits extension check this tutorial

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
   • optionally set an expiration time in days, weeks, or months. The expiration starts from the date the vouchers are created. Months are counted as 30 days
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
   • optionally set an expiration time in days, weeks, or months. The expiration starts from the date the LNURLw is created. Months are counted as 30 days
   • 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!

If no expiration time is set, the LNURLw never expires. Existing LNURLw links and vouchers keep working without an expiration unless one is added later.