r/Bitcoin: risks of multisig setups that include COLDCARD seeds
reddit-multisig-coldcard-seeds-risk
https://www.reddit.com/r/Bitcoin/comments/1ved6v3/risks_of_multisig_with_coldcard_seeds/
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post: 1ved6v3 author: m0r0_on created_utc: 1785763071 title: Risks of MultiSig with ColdCard Seeds body: Is there any threat that one should be aware of? I heard a guy saying it was ok, but becomes tricky when spending with those seeds as signers because of the pub key exposure - and then the transaction can be front-run by someone who pays higher fees. Are there other scenarios? What are the best options to migrate away in those cases? comment: p1fy9pa parent: t3_1ved6v3 author: DarrelXero created_utc: 1785763350 edited: false body: If the multisig qurom is meetable with ColdCards then funds are vulnerable in-flight with RBF sniping. Meaning if 2 of 3 of the keys in a multisig wallet were generated by affected ColdCard devices then they are vulnerable. If a minority of keys are ColdCard generated, funds are not vulnerable to this attack. If a ColdCard generated key is part of your multisig it should be replaced but it is not an emergency. comment: p1i87sw parent: t3_1ved6v3 author: Few_Response_7028 created_utc: 1785784570 edited: false body: If you have 2/3 coldcards. You need to migrate immediately. If you have not spent from that multisig, you are at least don't have a target on your back, but you will be drained eventually. Eventually you are likely to be brute forced, but you will be a later date target than the single sig folks. Use mara slipstream when you migrate and you can't be RNG attacked.Excerpt only. The complete copy is held offline and backs quotations on this site. The original publication remains the canonical public source.
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