FOFB (Fund of Fund BlockBank) is the first master fund based digital currency investment system based on blockchain technology. The value transfer token that supports the ecosystem's FOFchain is FOFbit (abbreviated as FOFB). The risk of holding a single digital asset is extremely high. By replacing a single digital asset with FOFBit and integrating the market value into the total high-quality assets of the master fund, it is easy to upgrade to holding a FOF asset portfolio. When redeeming assets, the total market value of the corresponding proportion of the total asset reserves of the master fund on the chain is automatically obtained, and it is automatically exchanged for any digital asset extraction....