The index value represents consensus forecast value. The consensus forecast is calculated as the median value. The forecasts of market participants for the last 28 days, including the calculation date, are included in the calculation. The most recent forecast from each participant is taken into account in the calculation. Base Asset – Bitcoin (BTC). Bitcoin is a cryptocurrency, a form of electronic cash. It is a decentralized digital currency without a central bank or single administrator that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries.