You are correct. The crowdsale is conducted by smart contract and GZB can be purchased exclusively by ETH

I see that the sale of tokens will be based on an equitable scenario for smart contract. Smart contract for sale of tokens already ready?
Yes, development of smart contract has been completed, audited and deployed. We are ready for the crowdsale

Your readiness once again confirms for me your experience in successful work with ICO projects. Now I'm going to wait for Bounty's campaign. I expect to get some free tokens. Is there a timeframe for the audit period for the Bounty campaign participants?