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r/coldcard: worked example of a mixed-vendor multisig migration

reddit-multisig-migration-plan

https://www.reddit.com/r/coldcard/comments/1vdqypo/good_personal_coldcard_solution/

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Community discussion
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1

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  1. Earliest copy held Current
    seen · Captured here 2,010 chars
    Extracted text as captured
    post: 1vdqypo
    author: czescwitamy
    created_utc: 1785698558
    title: Good personal Coldcard solution?
    body:
    I use Unchained collaborative custody with 2 coldcards. My solution was to first update firmware on both coldcards then I generated a new seed on 1 of the coldcards. Next I used an extra Foundation Passport I had to generate my second seed. Then I used that Foundation generated seed and input it into the second coldcard. So, now I have 1 firmware updated coldcard key, a foundation key and the unchained key and I moved my funds over already. I will still use both coldcards as signing devices but only 1 seed was generated with a coldcard. Am I solid with this plan? Thank you.
    
    comment: p1b69yp
    parent: t3_1vdqypo
    author: ardevd
    created_utc: 1785698730
    edited: false
    body:
    Sounds good, but ideally you should use dice rolls to generate your seeds instead of trusting the onboard RNG. That's kinda the lesson we've learned from this whole incident. 
    
    Don't trust, verify.
    
    comment: p1b8p42
    parent: t1_p1b69yp
    author: czescwitamy
    created_utc: 1785699406
    edited: false
    body:
    Thank you. Will probably do that eventually.
    
    comment: p1bp890
    parent: t3_1vdqypo
    author: Intelligent_Map_246
    created_utc: 1785704070
    edited: false
    body:
    Yeah and don't combine RNG with dice.  Dice only 
    
    comment: p1cai2q
    parent: t3_1vdqypo
    author: moviemaker2
    created_utc: 1785710452
    edited: false
    body:
    No you are not solid with this plan if you didn’t even do the dice rolls. At this point it’s idiotic to generate a new seed phrase with a coldcard at all, let alone using the built in RNG. 

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