SeedSigner

Frequently asked questions

Is a DIY hardware wallet like SeedSigner safe?

It can be the most trust-minimized signer you can own, because there is no vendor and no persistent storage. Keys are never kept between sessions, and you can read every line of the open-source code yourself. The catch: the risk moves entirely onto you. A flaw in your build, a tampered part, or a sloppy process is yours alone to catch. Safe if you do the work — fragile if you don't.

How much does it cost to build a SeedSigner?

Roughly $50 in commodity parts, built around a Raspberry Pi Zero, plus a small camera and screen. There is no finished device to buy from a vendor — you order the pieces and assemble it. The real cost is your time: a couple of hours of careful work, and the learning curve of doing it right. Cheaper than most hardware wallets, but you pay in effort instead of dollars.

Does SeedSigner store my keys?

No. It has no persistent storage and never keeps your keys between sessions. You re-enter your seed each time you sign, and it forgets everything when powered off. That stateless design — combined with the air gap (it never connects to a network) — is exactly what makes it trustless. The tradeoff is friction: re-entering a seed every session is slower than a device that holds your keys for you.

Why would I build my own Bitcoin signer instead of buying one?

To remove vendor and supply-chain trust entirely — no company can ship you a backdoored device or get acquired and change course. It's peak "don't trust, verify." The honest tradeoff: there's no support line and no warranty. A mistake in your build or process is yours alone. Most people are better served by a vetted hardware wallet. SeedSigner is for those who want to own the whole stack and verify it themselves.

Is SeedSigner one of the top cold storage options for Bitcoin?

It's commonly listed alongside Coldcard, Trezor, and Foundation Passport — but it's the outlier. The others are devices you buy from a vendor; SeedSigner you build yourself from commodity parts, so there's no manufacturer and no supply chain to trust. That makes it the most trust-minimized of the group and the least beginner-friendly. Best for Bitcoin-only holders who want to verify everything, not for someone wanting a polished out-of-box experience.