FOSS SIGNERS
SeedSigner
A DIY, air-gapped Bitcoin signing device designed around inexpensive, readily available hardware.
₹8,499View & Buy
DIY · Open source · Bitcoin
Open-Source
Bitcoin Signers
Build it. Verify it. Sign with it. Explore DIY and open-source signing devices built around transparent hardware and software.
FOSS signers
Explore Open-Source Signers
Open-source signing devices for people who want more control over the hardware and software they trust.
Why FOSS signers?
Why choose an open-source signer?
A different approach to securing your Bitcoin — with more visibility into the software, hardware and how your keys are handled.
01 · INSPECT IT
Know what you’re running.
The software is open for inspection. You don’t have to rely entirely on a manufacturer’s claims about how the device works.
02 · BUILD IT
Build it yourself — or don’t.
Projects such as SeedSigner are built around accessible hardware. You can assemble your own, or use a ready-built device while still benefiting from an open design.
03 · CHOOSE IT
Choose how your keys are handled.
FOSS signers can offer different approaches to key storage — including devices such as SeedSigner that can operate without permanently storing your seed.
04 · USE IT
Use the tools you prefer.
These projects can work with established Bitcoin wallet software rather than tying the signer to a single proprietary application.
Available from Bitasha
SeedSigner
A DIY Bitcoin signing device built around the Raspberry Pi Zero. A Pi Zero, display, camera and open-source SeedSigner software come together to create an air-gapped signer that operates without permanently storing your seed.
- Raspberry Pi Zero
- Open source
- Stateless seed handling
- Camera + QR
- Single-sig & multisig
- Dice & camera entropy
The basic workflow
How SeedSigner works
SeedSigner can create or load seed phrases, set up a BIP-39 Bitcoin wallet, review transactions and sign them — air-gapped and offline.
01 · Seed / entropy
Create or load your seed
Generate a new seed with dice or camera entropy, or load an existing seed phrase or SeedQR.
02 · Wallet setup
Set up your wallet
Export your wallet information to compatible Bitcoin wallet software for single-sig or multisig use.
03 · Review & sign
Review & sign
Scan the transaction, verify the details on SeedSigner’s screen and approve the signature.
04 · Return & broadcast
Return & broadcast
Scan the signed transaction back into your wallet software and broadcast it to the Bitcoin network.