The source is my agent, but the links it provided are these: https://www.coindesk.com/tech/2026/08/01/how-bitcoin-cold-wallets-lost-usd70-million-in-an-attack-that-never-touched-the-devices https://news.bitcoin.com/featured/the-coldcard-exploit-explained-who-lost-bitcoin-and-whos-at-risk/ And various others, but these are the main two.