Realistically speaking, if you offer bitcoin yield on LiFi, you will have to register with SEC to sell it to US investors.
Discussion
An investment contract is:
1. An investment of money
2. In a common enterprise
3. With the expectation of profit
4. To be derived from the efforts of others
Managing the funds for others is likely where one could get tripped up, making it a security.
How do you squeeze blood from a stone?