Coldcard wallet losses may approach $114 million as a possible fourth sweep emerges

Losses linked to Coldcard hardware wallets may be approaching $114 million, with signs of a possible fourth wave of fund sweeps emerging. Pending transactions show replace-by-fee signals, meaning anyone who spots their address in the mempool has only minutes to pay a higher fee and move their funds first. The situation points to a serious security vulnerability in the widely-used hardware wallet.