Specter Firmware enables you to build your own trust minimized signing devices.
It is FOSS free open source software under the MIT license.
Open source firmware and off-the-shelf hardware, for trust minimized bitcoin self-custody.
Specter Firmware
Open source firmware for signing devices.
Specter Firmware >>
Firmware Features
Embit Library
Specter firmware uses our Embit bitcoin library. It is designed to run either with Python 3 on a PC or with MicroPython on embedded devices.
Liquid Support
Intuitive Interaction
Interface optimized for a 4inch touch display.
Device Verification
Seed displayed after each pin entry verifies the device was not tampered with.
Secure Element
Removable smart cards store wallet seed and enable quick access to multiple wallets.
Airgapped
Use QR codes to stay completely offline.
QR Code Wallet Import
Scan QR code ti import wallet descriptor.
Store In Memory
Private keys can be stored locally in device memory.
Added Entropy
Use coin-flips to introduce extra randomness to key generation.
Key Generation
Securely generate seed words using the microcontrollers true random number generator.
Pin Generation
Lock device access with a pin.
PSBT
Partially signed bitcoin transaction support.
Verify Addresses
Verify and export receive addresses.
Specter DIY
Very easy to build from off-the-shelf components to minimize supply chain risk.
Build Instructions >>
Signing Device
The Specter DIY uses the STM Discovery Board and Waveshare QR Code Scanner to create a signing device purely from off-the-shelf components, minimizing supply-chain risks.
Stateless
To remove the need for a built in secure element Specter DIY can be run in agnostic mode, seed words are deleted every time the device is powered off and re-imported with each use.
3D Printed Case
Case designed by Seedsigner. Purchase a case or 3D print your own.
Components
Developer Board
STM Discovery board (STM32F469I)
QR Code Scanner
Waveshare Barcode Scanner
3D Printable Case
Barebones case designed by Seedsigner
Specter Shield
Open Source Extension board with QR Code Scanner, Battery and Smart Card Reader.
Order Specter Shield >>
Optimized Usability
The Specter Shield extension board combined with the STM Discovery Board enables full functionality of the Specter Firmware.
With integrated QR code scanner, battery and Smart Cards it provides an optimized user experience.
Smart Card Reader
Smart Cards are an alternative to a secure element, secrets stored on the card leave the device stateless. Your funds are secure and quickly accessible.
3D Printed Case
Case designed by Geometrick. Purchase a case or 3D print your own.
Components
Developer Board
STM Discovery board (STM32F469I)
Battery
1400 mAh 3.7v
Specter Shield
QR code scanner
Smart card Reader
Smart Card
NXP J3H145 Dual Interface Java card
3D Printable Case
Designed by Specter & Geometrick
Specter Signer Comparison
4" Touch Display |
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True random number generation + coin flip added randomness |
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Smart Card Secure Element |
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Agnostic mode |
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Airgapped PSBT QR Code Operation |
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Liquid support |
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Integrated Battery |
