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{
    "id": "c7c95f2a-039e-51d9-94f4-0212b6513fed",
    "kind": "assembly",
    "name": "SeedSigner DIY Bitcoin signing device build workshop",
    "slug": "seedsigner-diy-bitcoin-signing-device-build-w_312i",
    "url": "https://api.events.ccc.de/congress/2025/event/c7c95f2a-039e-51d9-94f4-0212b6513fed/?format=api",
    "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 lashing 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 already soldered\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": "2025-12-30T10:45:00+01:00",
    "schedule_duration": "02:00:00",
    "schedule_end": "2025-12-30T12:45:00+01:00"
}