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 https://github.com/lnbits/boltcards

Support groups

BoltCard https://t.me/bolt_card

LNbits https://t.me/lnbits

Building Gadgets with NFC

Writing with other tools (very advanced)

General Info about NFChttps://nz.mouser.com/applications/rfid-nfc-introduction/
Differences between BOLT11 invoice, LNURL-withdraw, LNURL-pay and LNURL-withdrawPOS flowshttps://github.com/theDavidCoen/LNURL-withdrawPOS#security-concerns-in-regards-to-lnurl-withdraw-links
Spec of payment request with Boltcardhttps://github.com/boltcard/boltcard/blob/main/docs/SPEC.md
Set up an own BoltCard-Serverhttps://github.com/boltcard/boltcard/blob/main/docs/INSTALL.md
Set up a BoltCard-Hub https://github.com/boltcard/boltcard-lndhub-docker

https://www.youtube.com/watch?v=Q5Iw7d6xVGA
https://youtu.be/Vtr5LvJggvc

https://fractalized.net/how-to-self-host-boltcard-lndhub-and-get-your-first-nfc-bitcoin-card-with-docker-and-umbrel/
Manually write a BoltCardhttps://github.com/boltcard/boltcard/blob/main/docs/CARD_MANUAL.md

https://community.nxp.com/t5/NFC/Configuring-NTAG-424-DNA-with-Encrypted-Part-and-CMAC-Part/m-p/1049316/highlight/true#M7082

https://www.whitewolftech.com/articles/payment-
Additional Tools to write a BoltCard With the Bolty https://github.com/lnbits/lnbits/wiki/Tooling-&-Building-with-LNbits

With the BoltCard Wallet App https://boltcardwallet.com/

BoltCard PoS
Set up the BoltCard-App from sourcehttps://github.com/boltcard/bolt-nfc-android-app
Other NTAG424 writing-Appshttps://play.google.com/store/apps/details?id=com.nfcdeveloperapp

https://www.nxp.com/products/rfid-nfc/mifare-hf/mifare-desfire/tagxplorer-pc-based-nfc-tag-reader-writer-tool:TAGXPLORER
Technical specificationshttps://www.nxp.com/docs/en/application-note/AN12

https://www.nxp.com/docs/en/application-note/AN12343.pdf

https://www.nxp.com/products/rfid-nfc/nfc-hf/nfc-with-ios-13-:NFC_IOS_13#resources
Mac drivershttps://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers
Why Apple & NFC are no good friendshttps://venturebeat.com/business/apples-nfc-problem-is-bigger-than-germany-the-eu-or-apple-pay/
Accepting LN through WebNFC

Specification

Where can i use WebNFC		https://web.dev/nfc/#security-and-permissions

https://w3c.github.io/web-nfc/

https://caniuse.com/?search=NFC
Nostr Bot to control a BoltCardhttps://github.com/ponthief/nostr_boltcard_bot/

Building with NFC

IMPORTANT

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.

Building hardware with LNbitshttps://github.com/lnbits/lnbits/wiki/Tooling-&-Building-with-LNbits
Beertaps with NFC (on a Pi)https://github.com/satoshiradio/beertap
https://codeberg.org/amiss.widen751/LN-Beertap_pi
Bitcoin events where you will find lots of machines that accept NFC Cards
https://einundzwanzig.space/events/

In Action
https://twitter.com/einundzwanzigSL/status/1584467088831225856
https://twitter.com/hyperfr33/status/1571154791073562625
Raspberry Pi & NFC Module PN532https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi
https://www.pcwelt.de/article/1174361/nfc-reader-mit-raspberry-pi-selbst-bauen.html (german)
https://learn.adafruit.com/adafruit-nfc-rfid-on-raspberry-pi
Adafruit https://learn.adafruit.com/adafruit-pn532-rfid-nfc/python-circuitpython
LN PoS Terminals https://twitter.com/BitcoinBeachBR/status/1606440048668291072
Browser NFC Readerhttps://twitter.com/onthebrinkie/status/1582778857261654018
WebNFC
Collection of NFC hardware projects in actionhttps://github.com/lnbits/lnbits/wiki/Powered-by-LNbits#lnurl-nfc-cards-rings–vouchers
Libraries to communicate with a NTAG424https://github.com/pieterjm/Adafruit-PN532-NTAG424
https://github.com/bitcoin-ring/Adafruit-PN532-NTAG424
https://github.com/MichaelAntonFischer/NDEF

The story behind the HCCP Badge

https://github.com/taxmeifyoucan/HCPP2021-Badge

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