You can search for the bitcoin address that you sent the coins to on blockchain.info. If the transaction appears in the block chain, then SR has your coins and you should contact SR support to have them show up in your account. The site doesn't have to be online in order for the transaction to be valid, since you're not actually "sending" anything when you do a transaction. You're merely signing the coins and saying that the private key to the new address can claim them.