Re: WAVES | Ultimate crypto-tokens blockchain platform | BITCOINCASH AIRDROP FEB 22
Waves community can give away 500 waves https://wavescommunity.com/contest-guess-the-seed/ , but they can't payout 600 waves owed to someone for almost 2 years now. 
As I said, I can't help you.
I'm not a member of the Waves team, this is not the official Waves topic.
The only way is by contacting support or try Slack.
I think after 2 years it will be difficult to claim a signature bounty.
I haven't just started trying. I've been trying to get these since Jun 2016