What exactly are these Bitcoin withdrawals? I hear they tend to take a lot of time. I own some Bitcoin, but I bought them at a site that's not MtGox, though I think that site used the MtGox exchange, and stored the bitcoin at blockchain.info, which immediately had the bitcoins I purchased. No noticeable waiting for the transaction to be verified or anything.<p>So what exactly is the problem here? Are my bitcoins at blockchain.info safe? Do I care what happens at MtGox? Am I required to transfer them there before I can sell them there? (Very unlikely I'd ever want to use MtGox at this point, but you never know.)