Bitcoin worth $600 million gets taken off the market as BTC/USD struggles to cement support for a retest of $40,000. Asset manager Grayscale added 18 times more Bitcoin (BTC) than miners added to the supply in just one day on Jan. 18. As various data sources confirm, Grayscale, which remains the biggest institutional buyer in the Bitcoin space, purchased a total of 16,244 BTC ($607 million) on Monday.