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SeedSigner lowers the cost and complexity of multi-signature self-custody by letting users build a stateless, air-gapped signing device from inexpensive publicly available components. The device uses QR exchange to move transaction data in and signatures out, keeping private keys offline.
At the conference, SeedSigner appears through Printer GoBrrr's hands-on workshop. It is a perfect Noderunners subject: buildable, inspectable, useful and just awkward enough to make you understand what your wallet software has been doing for you.
Air-gapped signer
DIY hardware
QR transaction flow
