DMM Bitcoin reported that 4,502.9 BTC, worth more than $304 million, was illegally leaked from its wallet around 1:30 p.m. JST. The exchange halted spot buy orders, leveraged position openings, and new account screenings while stating that customer BTC deposits would remain guaranteed. The excerpt says the execution method was still unconfirmed, with cited possibilities including compromise of a signature service or multi-signature private key, or address-spoofing during transfer approval. On-chain tracking identified a transaction hash and multiple Bitcoin addresses used by the exploiter, while an Arkham Intel bounty sought evidence that could identify the perpetrator or lead to fund recovery.