Nah bro. It ain't safe. Either this dudes website can easily be exploited, it's got bugs, or the owner is a straight up thief.

I created a user on the dudes website. Added a new deposit address. And deposited to it:
31pVJBVbRmoFyeebUpi2GMdMMAq5EVKR1M
The dude is basically saying that's not a Bitblender address...

I know for a fact I created the damn address and the dude has a copy of the private key.
But the fool ain't even looking or just waiting to take the money.. Find a more reliable alternative.