Bitcoin cold-wallet attack spreads to 4,500 addresses as losses near $89 million

AI Summary Galaxy Research flagged a third wave of sweeps tied to weak Coldcard-generated keys, with the attacker now targeting smaller balances and changing how funds are collected onchain. fulltext: 179 chars | fulltext source: rss-fallback | summary method: extractive Original: https://www.coindesk.com/tech/2026/08/02/bitcoin-cold-wallet-attack-spreads-to-4-500-addresses-as-losses-near-usd89-million Source: CoinDesk