Offline bitcoin signing device

Install KISS Signer

beta firmware test wallets only

FRUIT ISLAND, the arcade game the device boots into — Decoy signer Real signer

The KISS Signer home screen — Decoy signer Real signer

Plug it in

USB, from a desktop. Chrome, Brave or Edge.
Install

Choose your board, tick the box, press the button, pick the port. About a minute.
Power cycle

Unplug, wait three seconds, plug back in. You land on FRUIT ISLAND.

Which board is it? Guition 4.3in, the JC4880P443C, with an 800 by 480 screen. Waveshare 3.5in, the ESP32-P4-WIFI6-Touch-LCD-3.5, with a 480 by 320 screen. Guition 7in, the JC1060P470C, with a 1024 by 600 screen.

Verifying the binary before install loading build

This erases the device. I’m starting with keys that hold nothing.

This needs to be served over HTTPS, or from localhost.

Already on beta8 or later? No cable needed. Update from an SD card →

What was checked

The file matches the release checking

Signed by the KISS key checking

Key fingerprint. Check it elsewhere too checking

Rather not take this page’s word for it Check it yourself →

Flash with no internet → Read the docs →

Install KISS Signer

Plug it in

Install

Power cycle