Hi!
I collect some bitcoins, and I want invest.
I saw few investing websites and I don't sure are this sites safe?
Can you recommend me some verified sites?
And what you think about this earning method?
If you are looking to invest your BTC on a BTC related website/investment then I would highly advise against doing so.
There are a tremendous number of scams out there (they will likely have people vouching for them).
Even the sites that are not true scams are highly speculative. Add that to the fact that Bitcoin is highly speculative, you will be taking a tremendous amount of risk. A much better bet is to simply buy Bitcoin hoping that the price will rise in the future.