Today in crypto, Strive bought 1,800 Bitcoin for $143 million, becoming the fifth-largest publicly traded corporate holder. Strategy also resumed Bitcoin purchases after a two-month pause with a $370 million acquisition, while Cronos halted its blockchain after a Tectonic exploit involving an estimated $75 million.Strive joins top five corporate Bitcoin holders after $143 million purchaseStrive bought 1,800 Bitcoin for roughly $143 million last week, lifting its holdings to 23,156 BTC and making it the fifth-largest publicly traded corporate Bitcoin holder.The asset manager and Bitcoin treasury company acquired the BTC at an average price of $79,431 per coin, including fees and expenses. The purchase followed a 1,110 BTC acquisition the previous week for about $81.5 million.Strive’s latest purchase increased its Bitcoin holdings by roughly 8.4% in five business days and pushed the company past crypto exchange Bullish in the rankings of publicly traded corporate holders.The buying comes as Bitcoin rebounds from its recent downturn, climbing more than 23% to above $81,000 after the US Treasury Department announced it would increase certain long-term bond buybacks. BTC was back below $79,000 on Monday.Strategy buys $370 million Bitcoin in first corporate purchase since JuneMichael Saylor’s Strategy acquired 4,603 Bitcoin for $370 million, marking the first acquisition from the largest corporate Bitcoin holder in two months.Strategy acquired 4,603 Bitcoin (BTC) at an average purchase price of $80,318, pushing its holdings to 845,050 BTC, acquired for a total of $63.3 billion at an average price of $75,413, according to a Monday 8-k filing with the Securities and Exchange Commission.The Bitcoin purchase was funded by the net proceeds of a 602 million MSTR common stock sale. The company used $30 million of the net proceeds to increase its USD Cash reserve and $151.8 million to repurchase its preferred STRC stock.Nasdaq-traded MSTR was up less than 1% in Monday’s pre-market activity, after dropping more than 7% on Friday.The move marks Strategy’s first corporate Bitcoin acquisition since mid-June, when the company last acquired 1,587 BTC for roughly $100 million. Cronos halts network after Tectonic exploit involving estimated $75 millionCronos halted its blockchain after an exploit targeting decentralized lending protocol Tectonic involved an estimated $75 million, most of which remains on the Cronos network at the time of writing. On Sunday, Cronos said it identified an exploit in Tectonic and halted the network, promising updates. Tectonic separately warned users not to interact with the protocol while it investigated. Neither project has confirmed the cause or loss, and no restart timeline had been announced at publication.Researcher Weilin Li said the attacker exploited TONIC’s 20% collateral factor and thin liquidity, pumping the governance token’s price 100-fold within 20 minutes before borrowing other assets. Li described it as a “Mango-market style” pump-and-borrow attack. Li initially estimated $66 million was affected. He said the attacker bridged about $6 million to Ethereum before the halt, leaving $60 million on Cronos. Li later identified another attacker-controlled address holding about $8 million, bringing his estimated loss to roughly $75 million. Crypto.com CEO Kris Marszalek said the company’s app and exchange were unaffected and operating normally, adding that funds there were safe. Cronos and Tectonic have not said whether they will restrict the attacker’s addresses, recover the assets or compensate affected users. Cointelegraph contacted both projects and Crypto.com for comment.