my first hardware project: an offline cashu wallet on an esp32.
generate ecash, send it to the esp32 via bluetooth, esp32 decodes the ecash into individual proofs, pick any proof and display it as a QR code for redemption.
the esp32 never touches the internet. completely airgapped. just receives tokens, holds them, and displays cashu tokens.
https://blossom.primal.net/3f28a048378858a7de8bf498e253298ab32c16512ed10918bec6a8fa48739580.mp4
