RBF (Rainbow Coin) is the first global ETFs-type (Exchange Traded Fund) token launched by the Rainbow Fund Foundation. It provides individual investors of digital assets around the world with financial services tools that focus on value investment. RBF (Rainbow Coin) only exchanges value with BTC (Bitcoin), ensuring its relatively stable liquidity. It is supported by experienced professional technical team, adhering to the concept of value investment and inclusive finance, and adopting different types of digital currency asset portfolio strategy which has the characteristics of stable returns and strong resistance to market risks. The net fund value and index of RBF (Rainbow Coin) come from the price fluctuations of other digital currencies. After being processed by the algorithm model, intelligent full-automatic calculations and set-point execution transactions are realized. Position changes is daily updated of at 00:00 (GMT-5) with complete disclosure of wallet address and fund-holding token. The Rainbow Fund Foundation pledged that the BTC holding 20% of the total assets of the fund would not participate in transactions, and the system would guarantee the RBF (Rainbow Coin)'s real-time solvency.