BitFloppy with Sparrow Wallet

Use BitFloppy with Sparrow Wallet to prepare and sign PSBTs offline.

🏠 Main Project - Project overview
👤 User Guide - Device workflow and file states
🔧 Firmware Flashing - Firmware installation
💾 Firmware Binaries - Pre-built firmware

🔗 Integration with Sparrow Wallet

Setup BitFloppy with Sparrow

Flash Firmware: Use the firmware flashing guide to flash your BitFloppy board
Connect Board: Plug in your BitFloppy board via USB
Access Files: The board appears as a 1.44 MB mass storage device
Get Descriptor: Copy the descriptor from the appropriate BIP directory

Using with Sparrow Wallet

Receive Funds

Get Address: Copy an address from bip84/addresses.txt (or bip44/bip49)
Import to Sparrow: Use the address in Sparrow for receiving funds
Monitor: Check the address on a block explorer

Spend Funds

Create PSBT: In Sparrow, create a Partially Signed Bitcoin Transaction
Export PSBT: Save the PSBT as base64
Sign with BitFloppy:
- Create a file named PSBT.txt on the BitFloppy mass storage
- Paste the base64 PSBT into the file
- Unmount the volume
- Restart the board
- The board will generate PSBT_signed.txt with the signed PSBT
Import Signed PSBT: Load the signed PSBT back into Sparrow
Broadcast: Send the transaction to the network

Supported BIP Standards

BIP44 - Legacy Bitcoin addresses (P2PKH)
BIP49 - SegWit wrapped addresses (P2SH-P2WPKH)
BIP84 - Native SegWit addresses (Bech32)

Security Notes

Testnet Only: This is a proof-of-concept, use only with testnet funds
Unlock Required: Signing transactions will unlock the board temporarily
Backup: Always backup your mnemonic seed phrase securely

🔧 Troubleshooting

Common Issues

Board Not Recognized: Ensure firmware is properly flashed
PSBT Signing Failed: Check that the board is in the correct state
Address Mismatch: Verify you’re using the correct BIP standard

Getting Help

Check the User Guide for detailed operations
Review the Firmware Flashing Guide for technical details
See the Main Project for development information