After the Coldcard disaster, one question matters more than any other: where does your hardware wallet’s entropy actually come from?
Blockstream Jade just published the full details of how it generates recovery phrase entropy — completely open source, completely auditable. Here’s exactly what they showed:
Jade’s Multi-Source Entropy (No Single Point Of Failure)
Jade mixes randomness from 7 independent sources:
- 🎛️ Hardware CRNG / radio noise
- 🌡️ Environmental sensors
- 📷 Camera frames at boot
- 🔢 CPU counters
- 👆 User inputs
- 📱 The companion app
…all mixed in a continuous accumulator similar to Bitcoin Core. That’s the same design philosophy that makes Bitcoin itself secure: never trust a single source.
Remember the Coldcard lesson: one source fails, everything fails. Jade’s answer is 7 sources mixed together, so a broken chip, a bad sensor, or a compromised app can never reach your key on its own.
Fully Open Source And Auditable
This isn’t a marketing claim. You can verify it yourself:
- 📖 Help Center FAQ — how Jade generates your recovery phrase
- 📚 GitHub wiki — Jade Entropy
- 🔬 Source code — random.c
The Coldcard bug was found BECAUSE its code was open. That’s the whole point: open code gets checked by thousands of eyes. Closed code gets trusted on faith — and faith is exactly what failed $38 million worth of Coldcard users.
Prefer Your Own Entropy? Roll Dice.
If you don’t want to trust ANY device RNG — even an open source one — Jade supports creating a recovery phrase with dice.
You generate the bulk of the phrase offline, enter the first 11 or 23 words, and Jade calculates the valid BIP39 checksum word. Your randomness, your words, your keys.
📖 Create a recovery phrase using dice
The Bottom Line
After $38 million vanished because a hardware wallet’s seed generation silently failed, “trust us” is not an acceptable answer.
Jade publishes the code. Jade shows the sources. Jade lets you roll your own dice.
That’s what verifiable self-custody looks like — and it’s exactly what Coldcard could not give you.
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Your keys are only as safe as the entropy they were born from. Verify the source.
BLOCKSTREAM JADE JUST SHOWED EXACTLY WHERE YOUR ENTROPY COMES FROM — 7 SOURCES, FULLY OPEN SOURCE
