SeedSigner Complete Guide: How to Build and Use a DIY Bitcoin Signing Device

This comprehensive guide walks you through every step of setting up and using the SeedSigner, a DIY Bitcoin signing device that puts self-custody in your hands. It covers unboxing the kit, downloading and verifying the firmware, flashing a MicroSD card, assembling and testing the hardware, generating a master seed using either the camera or dice method, backing up the seed via mnemonic phrase or QR code (on paper or stainless steel plates), calculating checksums, importing a watch-only wallet into Sparrow Wallet, creating and signing PSBTs, importing private keys (with warnings about hot wallets), and building multisig wallets with multiple SeedSigners. It also includes a fire test verifying the durability of steel backups and emphasizes the importance of keeping your keys offline. Perfect for Bitcoiners seeking full control over their funds without trusting third parties.