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.


The story behind the HCCP Badge

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


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