QR Code
Fundamentals● Common
A two-dimensional barcode encoding data as a pattern of squares. Widely used in Bitcoin to encode addresses, payment requests (BIP-21 URIs), and Lightning invoices. Enables easy scanning with mobile devices for payments.
Technical Notes
BIP-21 URI: bitcoin:address?amount=X&label=Y. Lightning: BOLT11 invoice encoded as QR. Animated QR: used for PSBT transfer in air-gapped signing. Verify address on hardware wallet display, not just QR. Can encode hundreds of characters.
Metadata
Visibility: Public
Created:1/3/2026by System