Dice Rolls, Entropy, and SeedSigner | Keith Mukai SLP766 — Key Takeaways
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Dice Rolls, Entropy, and SeedSigner | Keith Mukai SLP766
Stephan Livera52mAug 22, 2026
Watch the originalCheap board game dice lose only 0.2 bits of entropy across a 128-bit seed — casino dice are unnecessary, but rolling technique (4–5 bounces minimum, multiple dice in a box) genuinely matters.
Key takeaways
Seed Signer's stateless RAM-only design means an evil maid who steals the device gets nothing
Seed Signer's stateless RAM-only design means an evil maid who steals the device gets nothing
- All loaded keys live only in RAM; unplugging the device wipes everything — no persistent key storage on hardware.
- The real attack vector is SD card swap: replacing the card with malicious firmware takes seconds and is undetectable.
No BIP standard exists for dice rolls — Cold Card, Seed Signer, and others use incompatible methods
No BIP standard exists for dice rolls — Cold Card, Seed Signer, and others use incompatible methods
- Cold Card and Seed Signer share the same algorithm (same rolls → same seed), but other vendors diverge.
- Bitbox skips on-device processing entirely, using a paper worksheet instead — making cross-verification impossible.
Cheap dice are fine for seed generation — 1.4% variance costs only 0.22 bits of entropy
Cheap dice are fine for seed generation — 1.4% variance costs only 0.22 bits of entropy
- Two large studies across hundreds of thousands of rolls found cheapest dice deviate only 1.4% from fair.
- Even inflating that to 2% unfairness, a 128-bit seed loses just 0.22 bits — negligible security impact.
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In this video
- 1mDice Rolling, Entropy, and ColdCard Fallout
- 3mCheap Dice Only 1.4% Unfair?
- 6mShake Multiple Dice in a Box
- 8mVerify Dice Rolls Across Devices
- 11mVerify Dice Seeds With Fake Rolls
- 14mMultiple Test Rounds Foil Attackers
- 17m90% Users Choose Easy RNG Mode
- 19mJade's D&D Dice Method?
- 22mBuild Your Own: Avoid Mailing List Leak
- 25mStateless Device: Evil Maid Gets Nothing
- 27mHand-Drawn SeedQR: Skip Typing 24 Words
- 29mSeedSigner: Built for Long-Term Cold Storage
- 32mEvil Maid SD Card Swap Destroys Security
- 35mWhy Multisig Beats Single-Sig + Passphrase
- 37mScan Sparrow PDF QR to Load Multisig
- 42mNo One-Size-Fits-All Security
- 47mUnderstand Dice Rolls Yourself
- 49mTake Baby Steps to Multisig
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