COLDCARD RNG incident the public record, collected and explained
Informational only, and this site never asks for your seed words. details

Informational only. This is an open source collection of what others have published about the incident, together with an explanation of it. It is not financial, security or legal advice, and not a substitute for professional advice about your own situation. It is not affiliated with, endorsed by, or speaking for Coinkite. Material is attributed and quoted as published; where sources disagree their scenarios are kept separate with their assumptions rather than reconciled into one answer. Everything is meant to be checked against the linked evidence rather than taken on trust. Act on your own judgement about a particular situation. Editorial standards and corrections.

Do not disclose recovery material to a website, form, message or support account. This site never asks for it, and contributions containing recovery words or private keys are not accepted.

r/Bitcoin: possible failures of a Coldcard and BitBox multisig setup

reddit-multisig-coldcard-bitbox-setup

https://www.reddit.com/r/Bitcoin/comments/1vj3xxb/what_are_the_possible_failures_of_this_multisig/

Organisation
reddit
Evidence role
Community discussion
Published
not established
Source changes
0
Detected differences
0
Unreviewed
0
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 15,876 chars
    Extracted text as captured
    post: 1vj3xxb
    author: labago
    created_utc: 1786215207
    title: What are the possible failures of this multi-sig setup?
    body:
    Setup:
    
    1. Sparrow as the wallet organizer (unsure of technical term)
    1. ColdCard as signer 1 (using updated firmware and software generated seed)
    1. BitBox signing device as signer 2 with software generated seed
    1. Both keys use a 13th word (passphrase)
    1. Descriptor string stored securely separate from keys
    1. Backup seed phrases stored securely separately
    1. Both devices require a password (separete from passphrase) to unlock
    
    What I am mostly conerned with is if 1 device gets comprimised in the same way the bugged ColdCards did, I would still be able to spend from the multi-sig wallet correct?
    
    Even if BOTH devices were compromized but my passphrase was unknown to the atacker, i would STILL be able to spend from the multi-sig correct? 
    
    This feels like a pretty solid set up, I have gotten here since barely avoiding the Coldcard attack recently. I still think the Colcard device is a good device so I don't really want to get rid of it, but adding an additional device to the mix seems like a good solution.
    
    Thoughts?
    
    comment: p2idx0s
    parent: t3_1vj3xxb
    author: FunWithSkooma
    created_utc: 1786215581
    edited: false
    body:
    I only use an old android phone with no internet as a signer using either cupcake from cake wallet or electrum wallet and my phone with either electrum wallet or Cake Wallet as watch only and online broadcast, and a passphrase.
    
    does not need to overcomplicate stuff really.
    
    comment: p2iebnp
    parent: t3_1vj3xxb
    author: Just_Bluebird_5268
    created_utc: 1786215700
    edited: false
    body:
    this right here.....this is the future of money

    Excerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.

How to check this yourself

The excerpts and plain unified diffs above show the text this project held and how it changed. To verify a quotation, compare it against the page itself or against the Internet Archive's copies, which are independent of this project.

Complete captures are held offline rather than mirrored here, so this page shows diffs and excerpts. If a quotation is ever disputed, the full copy can be produced. Ask.