Fountain is committed to creating a multi-win and sustainable content ecosystem, rewarding FTN based on each user's contribution to the community, so that the value of the content will eventually return to the creator. FTN is the most basic value recording unit of Fountain. There are two ways to obtain FTN. Obtained through contributions to the community, or through market transactions. Among them, the former is more critical, because the community must have the contribution of users' time to increase the overall value of the community. Therefore, we must design a PoC (Proof of Contribution) mechanism that effectively motivates the ecosystem to measure the contributions of all community users and reward tokens accordingly.