BITFLOPPY

// BITCOIN HARDWARE WALLET

Wallet on a floppy.

An offline Bitcoin signer with a simple file-based workflow. Move PSBT files by USB and keep signing keys off the network.

SYSTEM STATUS: READY_

FLASH FIRMWARE USE WITH SPARROW
Retro pixel-art room featuring the BitFloppy Bitcoin wallet
BITFLOPPY // OFFLINE BY DESIGN

// QUICK START

03. Sign offline

Copy a PSBT to the drive and retrieve the signed result.

Set up Sparrow →

// THE OFFLINE PATH

One file, one direction.

BitFloppy keeps the signing step deliberately small. Prepare a transaction on your computer, move a PSBT to the device, then bring back the signed result.

See the complete signing workflow →

// EXPOSURE AT A GLANCE

Choose the smallest surface.

Keep the device locked for normal wallet access. Unlock only for the brief signing step, then reboot to return to the safer default state.

Read the safety model →