Women Brazilian Hackers Create Revolutionary Bitcoin Solutions for Real-World Problems

A critical security alert for Bitcoin wallet users: a flaw in Coldcard's Random Number Generator (RNG) reveals that even with complete air gap isolation, your hardware wallet may be vulnerable. The weakness lies at seed creation, where a predictable RNG renders the entire security mechanism useless against sophisticated attacks. This incident doesn't just affect Coldcard but raises serious questions about the security of all Bitcoin hardware wallets. Users who trust their digital assets' security must urgently verify if their seeds were generated with true randomness.

Strategy has executed a substantial Bitcoin sale worth $105 million, pushing its dollar reserves to an impressive $4 billion. Half of the proceeds funded preferred dividends, while the remaining portion financed an $81 million share buyback program, marking the second such move in as many weeks.

This digital asset divestment strategy reflects a conservative market approach where companies are converting cryptocurrencies to fiat currency to strengthen their balance sheets and reward shareholders. Strategy's move demonstrates confidence in its diversification strategy and ability to generate value for investors, as the cryptocurrency market continues to seek stability following periods of volatility.

Michael Saylor's Strategy executed its second-largest Bitcoin sale of the year, offloading 1,638 BTC between July 27 and August 2 to fund dividend payments and STRC stock repurchases. The company sold the bitcoins at an average price of $63,957, raising a total of $104.7 million, according to an 8-K filing with the Securities and Exchange Commission. This strategic move demonstrates the flexibility of Strategy in managing its cryptocurrency portfolio, utilizing a portion of its digital assets to reward shareholders and strengthen its own capital position. Following the sale, the company still holds 842,138 bitcoins in its treasury, acquired at an aggregate cost of $63.5 billion, maintaining its position as one of the largest institutional Bitcoin holders in the market.

The Coldcard wallet suffered a critical failure causing transfers of less than 1 BTC to hit levels unseen since the FTX collapse, resulting in estimated losses of US$ 105 million. This security breach undermines trust in hardware wallets and underscores the critical need for code audits before large crypto asset movements.

Strategy has completed its third Bitcoin sale of 2026, raising its USD reserves to $4 billion while maintaining one of the largest Bitcoin treasuries globally with 842,138 BTC. Executive Chairman Michael Saylor clarified that this treasury adjustment doesn't signal abandonment of Bitcoin, showcasing continued confidence in the digital asset.

This strategic move comes at a critical time for the crypto market, where major institutions are balancing their Bitcoin exposures. Strategy demonstrates a prudent approach, increasing dollar liquidity while maintaining a significant BTC position, positioning itself to capitalize on future market opportunities and volatility.