As the size of the pool increases, the payout decreases, as it is to be shared among many miners. F2Pool is one of the largest Chinese Bitcoin pool, launched in the year F2Pool allows mining of Bitcoin, Litecoin, and Zcash. In a corporate communication , Bitmain claimed this was a feature and not a bug. Buy Bitcoin Worldwide does not promote, facilitate or engage in futures, options contracts or any other form of derivatives trading.