WTF is this at stamp.
I would say - an attempt to sell a lot of coins quickly, and realize the best possible price for them.
1. 800 BTC market sell
2. 500 BTC market buy
3. 700 BTC market sell
4. 500 BTC market buy
Yeah, sorry I did not check carefully enough at first. I rephrase my answer:
I don't know. Doesn't seem legit.