[Bitcoin is only a few days away from the 20 millionth coin being mined, with the remaining 1 million expected to take 114 years] According to CoinDesk, Bitcoin is only a few days away from the 20 millionth coin being mined. Currently, over 95% of the total supply of 21 million coins is in circulation. The last 1 million BTC will take another 114 years to be fully mined.