I checked the BTC site today and there wasn't blockchain on it. Do you know the reason?
I can't tell you why it isn't on bitcoin.org, but what I can tell you is it's safe.. for now.
Everyone's saying it but I'll still say it again: don't keep more than what you need for your daily needs on any online service.
It is safe, and many others are, until they aren't. But when they won't be anymore, you'll pretty much loose everything.