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A critical Coldcard security flaw exposed Bitcoin to massive loss. Learn how a predictable seed compromised user funds. The $130 million loss resulted from a safety check error that effectively disabled the hardware random number generator. Instead of true randomness, devices were seeded with predictable values, making them vulnerable to brute-force attacks. This breakdown explains why the Coldcard security flaw exists, the mechanics of how it impacts Bitcoin security, and the reality of the threat. Crucially, applying a firmware vulnerability patch does not protect users if their device was already initialized with a compromised seed. We examine what this means for hardware wallet owners and why generating a new seed is the only way to secure your assets. This technical analysis provides the necessary context to understand the risk and the steps required to mitigate it. Subscribe for daily security breakdowns, and comment below if you want to see how other hardware wallets handle random number generation. A safety check written to prevent this exact disaster is the reason it happened. In March 2021 one C preprocessor directive slipped into the Cold Card firmware build. It asked whether a macro existed, when it needed to ask whether that feature was switched on — and the macro existed, set to zero, deliberately, for a perfectly good reason. So the compiler error never fired, the build stayed green, and a small general-purpose random number generator meant for shuffling things quietly generated real Bitcoin seeds for five years. 128 bits of entropy became about 40. We read the four actual lines of code, then count — with runnable code and one worked device — exactly where the other 88 bits went, and finish on a free Colab T4 where 2^40 falls in 20 seconds and 2^128 takes 1.98×10²⁰ years. ⚡ The core (libngu): ```c extern uint32_t rng_get(void); #define CHIP_TRNG_32() rng_get() #ifndef MICROPY_HW_ENABLE_RNG // asks "does it EXIST?" — never looks at the value #error "get a HW TRNG plz" #endif ``` ⚠️ Affected: Coldcard Mk2 / Mk3 on firmware 4.0.0–4.1.9. Patching the firmware does not fix a seed that was already generated. If you can't reconstruct what firmware your device ran when you made your seed, treat that as a yes and migrate. ⏱️ Chapters 00:00 The safety check that caused it 00:46 What a hardware wallet actually promises 01:36 Your wallet IS a random number 02:37 The code: #ifndef MICROPY_HW_ENABLE_RNG 03:40 'Does it exist?' vs 'Is it ON?' 04:33 Why the macro was 0 — on purpose 05:39 Yasmarang: the PRNG that took over 07:05 128 bits — and the question 'so how do you get to 40?' 08:22 Width is not entropy (counted) 09:58 Where the bits actually went 11:35 ⭐ One device, counted start to finish 13:24 88 bits is not 'a bit weaker' 14:44 Run it yourself — live on a free Colab T4 16:19 How long 1.1 trillion really takes 17:58 The attack — entirely offline 19:14 Four waves, 1,596 BTC 20:27 Why every article gives a different number 21:45 How it hid for five years 23:15 ⚠️ Patching does NOT fix your seed 24:32 What this actually teaches you 26:19 The whole thing in five lines 27:14 Support the channel 27:29 Next episode 🧰 Concepts: entropy & TRNGs · C preprocessor (#ifndef vs #if) · MicroPython Yasmarang PRNG · BIP39 seed generation · search-space arithmetic · brute force on GPU 🔗 Full code + notebook: https://github.com/nikshev/unstuck/tree/main/episodes/g34-coldcard 🔗 Block Engineering write-up: engineering.block.xyz/blog/predictable-rng-fallback-and-32-bit-reseed-in-coldcard-firmware — — — ☕ Support: SOL: 3bQPvjmVr2hXdZuzByxmoo3kwkjUwTdnerUUDYUweF2K ETH: 0xf96102f5f500f1E51E3A1e9B576977fB2EaC83E5 USDT(Tron) TXA9qxr9yZjV3yEPiN9gGYzV6agfCUbizj Ko-fi https://ko-fi.com/0xunstuck 🔔 Subscribe: https://www.youtube.com/channel/UC32d5uV5MEC1oMqVaVbQPNA?sub_confirmation=1 💬 Are you on a Coldcard Mk2/Mk3 — and do you know what firmware made your seed? #Coldcard #Bitcoin #hardwarewallet #cryptosecurity #RNG #entropy #infosec #seedphrase #cryptonews #web3security

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