{"id":"fe789c4d-9b9b-5a9d-b2dd-aeb6dc6bc59d","kind":"assembly","name":"SeedSigner DIY Bitcoin signing device build workshop","slug":"seedsigner-diy-bitcoin-signing-device-build-worksh","url":"https://api.events.ccc.de/congress/2025/event/fe789c4d-9b9b-5a9d-b2dd-aeb6dc6bc59d/?format=json","track":null,"assembly":"cdc","room":"c61e6141-f206-424d-99af-1391b103eace","location":null,"language":"en","description":"Seedsigners are open-source DIY signing devices which can be built using \"normal\" hardware like a Raspberry Pi and act as kind of hardware wallets to sign Bitcoin transactions. Since the hardware is missing a secure element chip, the keys are saved externally, usually via self-drawn QR-codes which are read again for every use via the build-in camera.\r\n\r\nWe brought a few kits with us which we sell for 45€ and build together. We will solder the 40pin GPIO header to the Raspberry Pi Zero, flashing the firmware on the MicroSD card and then build everything together in the 3d-printed enclosure.\r\n\r\nThe kit includes:\r\nRaspberry Pi Zero 1.3 (without Wifi or Bluetooth chip), GPIO-header to solder\r\nDisplay-Hat with joystick and buttons\r\nCamera\r\n64GB MicroSD card\r\nMicroUSB to USB-C cable\r\n3D printed enclosure\r\n6 printed templates for self-drawn QR-Codes","schedule_start":"2025-12-27T14:30:00+01:00","schedule_duration":"02:00:00","schedule_end":"2025-12-27T16:30:00+01:00"}