Japanese crypto exchange DMM Bitcoin is reportedly winding down after a $320 million Bitcoin loss from a May hack. The breach involved a private key theft, leading to the loss of over 4,500 BTC. Despite initial promises to guarantee user deposits and procure equivalent funds, the exchange has struggled to recover. Plans are in place to transfer customer assets to SBI VC Trade by March, according to Nikkei Asia. This incident marks one of the largest crypto losses in the region since the 2018 Coincheck hack. DMM Bitcoin, launched in 2018, is owned by DMM Group.