Nerdish link collection and deep dive for NFC builders ⚡️

While the simple LNURLw voucher work with nearly every wallet out there

not all wallets support the boltcard service yet

Github of the Boltcard LNbits extension

Support groups



Building Gadgets with NFC

Writing with other tools (very advanced)

General Info about NFC
Differences between BOLT11 invoice, LNURL-withdraw, LNURL-pay and LNURL-withdrawPOS flows
Spec of payment request with Boltcard
Set up an own BoltCard-Server
Set up a BoltCard-Hub
Manually write a BoltCard
Additional Tools to write a BoltCard With the Bolty

With the BoltCard Wallet App

BoltCard PoS
Set up the BoltCard-App from source
Other NTAG424 writing-Apps
Technical specifications
Mac drivers
Why Apple & NFC are no good friends
Accepting LN through WebNFC


Where can i use WebNFC
Nostr Bot to control a BoltCard

Building with NFC


SPI is generally more reliable than I2C for NTAG424 implementations on an ESP32. This is because the NTAG424 chip uses a proprietary 1-Wire communication protocol that can be implemented using either I2C or SPI, but I2C can sometimes be less reliable due to issues with bus contention and clock stretching.

The story behind the HCCP Badge


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