It is recommended that everyone pay attention to btcdom, which has nearly multiplied by seven times from the bottom to now. This contract involves buying half Bitcoin to go long and the other half altcoins to go short. As long as the altcoins do not rise, one can ignore the bull and bear markets and continue to earn money. Alternatively, one can hold it during the clearing period; holding this position for over a month basically guarantees profit. The most important thing is that this index has a very small drawdown, allowing for appropriate leverage.