qrkey: Command-line Tool for Offline Private Key Backup with QR Codes

qrkey is a command-line tool for generating and recovering QR codes from files for offline private key backup. It handles large files by splitting them into multiple QR codes and includes metadata for easy recovery and validation. Install via Homebrew (macOS), Docker, or see releases for other systems. Generate: `qrkey generate --in --out file.pdf`; Recover: `qrkey recover --in `.