Hi and thank you Ubay82 !
The cold staking contract is an essential element of Callisto and will attract both investors who can place their CLOs there to earn interest, and smart contract developers who will want to audit their smart contract for free, so in my opinion this bounty is an original way to present them the project.
A few months ago a turbo bounty and an airdrop were organized (
https://www.altcoinstalks.com/index.php?topic=33328.0), so I suggest you to keep an eye on the bounty section of the forum because when other bountys will be organized they will be posted there