CertiK (CTK) is a formal verification framework to mathematically prove that smart contracts and blockchain ecosystems are bug-free and hacker-resistant. The CertiK token sale period isn’t set yet.
On July 22, CertiK announced a creative contest, in which people should design any CertiK related artworks/graphics and tweet to @certikorg with their masterpieces.
There is no set timeframe and winners will be constantly announced via the CertiK official twitter account.