bitcoin-safe.org supports all major airgapped hardware signers. QR and SD card.
nostr:nevent1qqsp3t328j7fgsd0eptrgcf3usdwp6k48af9h2xk9rwmew6vhutn50gpypmhxue69uhkummnw3ezuetfde6kuer6wasku7nfvuh8xurpvdjj7q3qq67f4d7qdja237us384ryeekxsz88lz5kaawrcynwe4hqsnufr6sxpqqqqqqzfksssp
