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Coldcard PRNG Flaw Lets Attackers Reconstruct Private Keys: 1,367 BTC Drained

A crypto hack targeting a firmware flaw in the Coldcard Bitcoin hardware wallet has drained at least 1,367 BTC, worth approximately $86M at current prices, from more than 4,500 cold storage addresses across three waves of attacks.

The exploit never required physical access to a single device; it rebuilt private keys from scratch using mathematics.

Galaxy Research: Three Suspected Attacks on Coldcard-Generated Addresses Drain 1,367 BTC Galaxy Research said its Bitcoin on-chain analysis identified three suspected attack waves targeting addresses generated by Coldcard, involving 4,585 addresses and a total of 1,367.05 BTC… pic.twitter.com/JdSz4W1TIk — Wu Blockchain (@WuBlockchain) August 1, 2026 The central problem: Bitcoin self-custody promises that a key stored offline is unreachable.

This attack proved that an unreachable key can still be unguessable, or not.

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Yes, most public blockchains (like Bitcoin and Ethereum) are transparent. Transactions can be traced back to public keys and wallet addresses, meaning that while they are pseudonymous (names are not directly tied to addresses), they are not completely anonymous.

TRADEMINATI X is an automated real-time cryptocurrency news aggregator. It fetches and analyzes RSS feeds, organizing publications by coin hashtags to make tracking specific assets efficient.
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