O QUE REALMENTE ACONTECEU NA COLDCARD | E POR QUE DEMOROU 5 ANOS
Um bug no gerador de números aleatórios (RNG) da Coldcard drenou 1.196 carteiras de Bitcoin em 41 minutos quase US$ 88 milhões. Neste vídeo eu abro o root cause, linha porlinha, e explico por que esse mesmo erro pode estar escondido no seu backend agora.
ADVISORY OFICIAL (leia se você tem Coldcard Mk2/Mk3 correção no firmware 4.2.0):
https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/
Root cause técnico (Block Engineering) — a checagem errada da flag e o fallback pro gerador determinístico:
https://engineering.block.xyz/blog/predictable-rng-fallback-and-32-bit-reseed-in-coldcard-firmware
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FONTES
O incidente:
https://blog.coinkite.com/coldcard-mk3-seed-generation-warning/
https://engineering.block.xyz/blog/predictable-rng-fallback-and-32-bit-reseed-in-coldcard-firmware
https://thehackernews.com/2026/08/coldcard-hardware-wallet-flaw-linked-to.html
https://www.bleepingcomputer.com/news/security/coldcard-wallet-rng-flaw-likely-linked-to-88-million-bitcoin-theft/
https://blog.coinkite.com/entropy-technical-backgrounder/
Fundamentos:
https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
https://factorable.net/weakkeys12.conference.pdf
https://safeguard.sh/resources/blog/csprng-secure-random-number-generation
https://man7.org/linux/man-pages/man4/random.4.html https://www.bsi.bund.de/SharedDocs/Downloads/EN/BSI/Publications/Studies/LinuxRNG/LinuxRNG_EN_V5_3.pdf
Testes estatísticos (NIST):
https://csrc.nist.gov/projects/random-bit-generation/documentation-and-software
https://www.nist.gov/news-events/news/2022/04/decision-revise-nist-sp-800-22-rev-1a
Mitigação (multisig e entropia extra):
https://coldcard.com/docs/paranoid/
https://coldcard.com/docs/verifying-dice-roll-math/
https://sparrowwallet.com/docs/best-practices.html
https://www.odaily.news/en/post/5212289 Receive SMS online on sms24.me
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