Graviton (GRAV) started in 2015 and finished in 2015, with a total supply of unknown coins. The team/founder is hidden, The main reason this coin was listed is desertion.
(from old site) Graviton is another example of the versatility of altcoins, it is here, and it is now. Lets work together to establish this coins path and prepare for the future. Graviton is based on the latest codebase and includes dynamic HiPoS, along with many tweaks to ensure optimal operation and functionality.