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r/Bitcoin: a post-incident wishlist for a hardware signer design

reddit-dream-signer-design

https://www.reddit.com/r/Bitcoin/comments/1vgfiw0/my_dream_hardware_wallet/

Organisation
reddit
Evidence role
Community discussion
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not established
Source changes
0
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Copies held
1

Every check is recorded, including checks that found no text change. A detected edit is therefore bounded between two checks. The publisher's exact save time is not observable from this record. Last checked .

  1. Earliest copy held Current
    seen · Captured here 5,832 chars
    Extracted text as captured 
    post: 1vgfiw0
author: PoeCollector
created_utc: 1785954232
title: My Dream Hardware Wallet
body:
I just wanted to describe my dream hardware wallet.
- In terms of hardware design, it's a Coldcard Q. Maybe even buy their design when they go bankrupt and have to sell assets.
- Firmware is bitcoin only, truly FOSS, with peer code reviews (pull requests approved by colleagues before merges are allowed)
- After internal approval, 3rd party, AI-assisted security audits are required. 
- Only one method for seed phrase generation is allowed: hardware TRNG chip as the starting point, plus 100 user-entered d6 rolls. The seed is hashed again after each number is entered. (This was one option on the ColdCard, the best option, and the dice hashing function is simple and was never bugged on any version)
- Device refuses to show you the words until you have entered 100 1-6 numbers.
- Device ships with 4 casino-grade dice. Instructions suggest the extra paranoid can mix in dice from an arbitrary board game in your house or whatever for extra defense against supply chain attack.

Such a wallet wouldn't necessarily have mass appeal or advertise being "easy to use", instead it would have the same sort of "hardcore" target audience CoinKite did, with better execution.

comment: p1wptu9
parent: t3_1vgfiw0
author: Over_Regular_6897
created_utc: 1785954967
edited: false
body:
No need for casino dices lol. Just place a bunch of cheap dollar store dice in a bag, shake it like maracas, and eject them from the bag on the floor. You'll see what numbers fate has sealed for you. Repeat 

comment: p1wqar5
parent: t3_1vgfiw0
author: AvailableTie6834
created_utc: 1785955086
edited: false
body:
so... Krux? Seedsigner?

comment: p1wtc3h
parent: t3_1vgfiw0
author: CiaranCarroll
created_utc: 1785955845
edited: false
body:
* Only one method for seed phrase generation is allowed: hardware TRNG chip as the starting point, plus 100 user-entered d6 rolls. The seed is hashed again after each number is entered. (This was one option on the ColdCard, the best option, and the dice hashing function is simple and was never bugged on any version)

This increases trust in the code, which not all users can read. Seed generation should be deterministic and reproducible. The same dice rolls entered into a completely different device running the calculations should produce exactly the same seed phrase.

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