HF is the decentralized digital asset of HF digital ecosystem. The unique proof of interest TOKEN of HF digital ecosystem is produced in the mining way of HFFC pledge proof of interest mechanism, and the TOKEN is obtained through decentralized redemption contract. As a negotiable cryptographic certificate of digital rights, HF can be used as a digital token in the global business of THE HF digital ecosystem and various applications of the global ecosystem. It is an important hub supporting the HF ecosystem and the cornerstone for the collaborative development and autonomy of the global community members.