I prefer to invest in Poloniex.com. I felt safe and comfortable because Poloniex.com has been very reliable and also reliable for investment in the world bitcoin.
How do you invest in an exchange? Can you be the share holder of the Poloniex or just trading in that exchange?
Go on poloniex and lending. Then u can loan out btc or many other altcoins for traders speculate on prices. Poloniex takes 15% of interest in fee.