Yearn Shark Finance Is DeFi project with It's Own Decentralised YSKF SWAP Exchange and Staking Platform. YSKF SWAP Exchange & Staking App Launching Soon. YSKF is a governance token that is used to gain staking rewards in the Shark Staking Eco-System. Staking rewards are not derived from earnings The reward that is received in the process of staking is actually a proportion of the limited pool of tokens. It is not derived from the companies profits or earnings.