A mysterious Bitcoin whale known as "Mr. 100" has accumulated over 52,996 BTC, worth more than $3.5 billion. The wallet has been receiving BTC since November 2022 and has been adding at least 100 BTC nearly every day since February 14. Speculation suggests the whale could be a Hong Kong financial institution, the Qatar Investment Authority, a Middle Eastern sovereign wealth fund, a cold wallet associated with South Korean Upbit exchange, or an unidentified tech billionaire. Blockchain intelligence firm Arkham Intelligence has tagged the wallet as belonging to the Upbit cryptocurrency exchange.