In the second half of the year, about 550,000 bitcoins were withdrawn from exchange accounts. As a result, the number of BTC held on exchanges decreased to 22% of the total supply. Over the past 6 months, several events have occurred in the market, which led to the fact that about 550,000 BTC were withdrawn from exchange accounts by users and transferred to cold storage. According to the analytical company Glassnode, the Binance cryptocurrency exchange, which lost more than 90,000 BTC, became the leaders in the withdrawal of bitcoins.. About 200,000 BTC were withdrawn from Coinbase, and the FTX exchange lost over 70,000 BTC before blocking all transactions by the judiciary. As of the end of December, current BTC reserves held on exchanges represent less than 22% of the total BTC supply.. Glassnode analysts note that in January, OTC holdings of BTC were recorded at about 14 million units, but as of December it exceeded 15 million.. This confirms the conclusions of experts that 78% of working capital in BTC is stored in cold wallets. Major mining pool BTC.com today reported a hack that gave hackers access to pool and customer funds. The total loss was about $3 million.