COLDCARD RNG incident the public record, collected and explained
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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.

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History of weak random number generation vulnerabilities

lopp-rng-vulnerability-history

https://x.com/lopp/status/2083933846622384587

Captured screenshot of the post by @lopp, posted 2 Aug 2026, 15:12 UTC
@lopp posted captured full-size capture → original post →
Author
@lopp
Organisation
independent
Evidence role
historical-precedent
Posted
Capture status
capture held

Jameson Lopp lists earlier weak random-number-generation vulnerabilities found in wallets and libraries, including COLDCARD Mk2 through Mk5 and Q, to show the problem is not new. Held as historical context for the incident. The inventory is the poster's own compilation and is not independently verified here.

This post is registered as evidence and has a locally held capture. The original remains the canonical publication.

How to check this yourself

Compare the screenshot or a quotation against the original while it is available.