The cryptocurrency market tanked 8 per cent in the 24 hour period ending 9 am IST today. This was along expected lines, given the huge options expiry ($7 billion worth) on Friday. Bitcoin (BTC) continues to enjoy support in the $31-32K range. All top cryptocurrencies have declined at least 6 per cent, with Dogecoin dropping 14 per cent, after a strong growth of 25 per cent the previous day.