Bitcoin onchain activity has reached its highest level of 2026 as the Coldcard wallet exploit continues to unfold.K33 said similar spikes in Bitcoin activity have historically appeared around local market tops and bottoms.Galaxy Research has confirmed the theft of 1,596 BTC from about 7,300 addresses, with losses potentially rising to around 2,055 BTC.The Coldcard breach has prompted some users to move funds to centralized exchanges while raising new questions about hardware wallet security.