for a new investor, if he wants to receive future airdrop, he just need to download wallet, buy some btx, and register his address on the site? nothing more?
That is correct!

And of course enjoy the hard working efforts of the team and real progress for the project.
I got 10.9 btx on the same adress wallet that I register for AIRDROP, but nothing....
1AsAvGQot3TDPNFLoU1V9M8SZDQ9YuwyQX
You were too late for the 25% airdrop !
Latest Transactions
Timestamp Amount (BTX)
2nd Nov 2017 | 11:43:22 | + 0.90623660
2nd Nov 2017 | 11:12:55 | + 9.99000000
But you can still enjoy the futures 3%+ airdrops every monday !
And even more, since the airdrps will increase by 1% every month.
See:

It is really hard to estimate when funds will be depleated for the airdrops. It could be a few months earlier than suggested in the graphic. Gains of more than 100% in total will bestill possible.