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Coldcard strengthens seed generation with firmware update

Coinkite released a new security upgrade to strengthen seed phrase generation by requiring user-supplied entropy mixed with improved device randomness.Coinkite announced firmware 5.6.1 for Coldcard Mk4 and Mk5 devices and 1.5.1Q for the Coldcard Q in a Thursday blog post.The release requires newly generated seeds to include user-supplied entropy through at least 65 keypresses with unpredictable timing, 50 rolls of a six-sided die or 128 coin flips. That input is combined with randomness from multiple device sources, including its secure elements and hardware random-number generator (RNG).The combined randomness is used to create the wallet’s seed phrase and is intended to keep its private keys unpredictable even if one of the device’s entropy sources fails. Coinkite told users to upgrade immediately, emphasizing that existing seed phrases remain vulnerable even after upgrading and must be replaced with new seeds before migrating funds. Confirmed losses from the Coldcard exploit reached 1,778 Bitcoin (BTC), worth about $112 million, according to an Aug. 14 report by Galaxy Research. This makes the Coldcard hack the third-largest cryptocurrency exploit of 2026, according to data aggregated by DefiLlama.Coldcard adds transaction and USB safeguardsThe company’s July 31 firmware update had already fixed the seed-generation failure for newly created wallets. Thursday’s release follows three weeks of broader security review and also adds safeguards around USB data handling, transaction signing and hardware randomness.Coinkite said the update addresses a theoretical attack involving a compromised computer USB port by re-verifying transactions immediately before signing. The firmware also introduces additional hardware RNG checks and a boot-time test designed to verify that the wallet is using its intended hardware path.Related: Cybersecurity firm unveils crypto phishing campaign targeting 885,000 phone numbersOther changes restrict USB downloads to the device’s most recent output and require an encrypted session, while certain Bitcoin signature hash modes that allow transaction outputs to remain modifiable are now blocked by default.Coinspect launches weak-seed detection toolOther companies are also launching software to identify wallets potentially exposed by weak seed generation.Blockchain security company Coinspect revealed Unlukey, a free public tool for identifying wallet addresses generated from weak seed phrases. The first iteration of the tool aims to reproduce known weak seed generation and check whether public addresses belong to the affected dataset, Coinspect said in a Friday X post.Weak seed phrase generation was one of the main vulnerabilities that led to the Coldcard exploit. TRM Labs said that a firmware bug from March 2021 weakened seed randomness on some Coldcard wallets, reducing key strength from 128 bits to 40 bits and making them “brute-forceable without physical access.” Magazine: Inside the ‘fake police raid’ that forced a $1M Bitcoin transfer

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Strategy Bitcoin treasury hits breakeven point as BTC price passes $77K

Bitcoin (BTC) hit $77,000 on Friday as business intelligence company Strategy’s corporate treasury returned to profit.Key points:Bitcoin reaches its highest level since May 26 as it revisits $77,000.Price returns above the cost basis for Strategy’s BTC corporate treasury at $75,385.Around 11% of the BTC supply constitutes a new band of support below $68,000.Strategy out of the red with Bitcoin at highest since MayData from TradingView showed new local highs above $77,400 prior to the week’s final Wall Street open.BTC/USD one-day chart. Source: Cointelegraph/TradingViewNow up around 20% in 48 hours, BTC/USD saw little by way of consolidation as it reclaimed a key level for Strategy, the world’s largest corporate Bitcoin treasury company. Data from monitoring resource BitcoinTreasuries puts the cost basis for Strategy’s holdings of 840,447 BTC at $75,385, currently with a year-to-date gain of approximately $450 million.Strategy Bitcoin treasury cost basis data. Source: BitcoinTreasuriesAs Cointelegraph reported, between Aug. 3 and Aug. 9, Strategy opted to sell a small portion of its treasury worth 1,690 BTC to repurchase 1.15 million shares of its STRC preferred stock for $108.6 million. The move represented the company’s fourth Bitcoin sale of 2026.Concerns over the long-term viability of the company’s Bitcoin investment thesis accompanied the sales, something that the subsequent BTC price run-up should help alleviate, independent crypto analyst William Clemente suggested.“Not only should Saylor/Strategy fears have been abated for a while once he showed that he was willing to sell BTC to rebuy STRC, but now after this price impulse they are even more over-collateralized by their BTC holdings,” he wrote on X, referring to former CEO Michael Saylor.In an interview with Fox News earlier in August, current CEO Phong Le stated that Strategy would return to buying Bitcoin before the end of the year.New BTC buy wall sits below $68,000Amid misgivings over the durability of Bitcoin’s volatile upside move, analysis from onchain analytics platform Glassnode revealed a new safety net forming below $70,000.Related: Bitcoin has ‘largely purged’ froth that preceded 50% drop from $126K: BlackRockSome 3.44 million BTC now have an onchain cost basis, also known as realized price, between $58,000 and $67,000. Of this, 2.23 million BTC — equal to around 11% of the total supply — was added over the past 11 weeks.“It’s the densest cost-basis cluster below spot — a key potential support zone on any retracement,” Glassnode cofounder Rafael Schultze-Kraft commented on X.Bitcoin UTXO realized price distribution data. Source: Rafael Schultze-Kraft on X.comBTC/USD broke through several key resistance levels this week, including its 200-day simple moving average (SMA) at $68,967, a key target to reclaim to end the long-term BTC price downtrend.

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