What if blockchain.info goes down is my wallet lost then ?
unless you have a backup.
I dont have any backup of my wallet. I only have the private keys written. Am I safe ?
There are a lot of
if's here, but
if you're sure it's your private keys that you wrote down, and
if you're sure there are no typos, and
if you never add any new receiving addresses to your wallet, than you should be safe.
I had the same thought: are you very sure you know you have your
private key written down and not something else (public key, Bitcoin address, etc.)? Also you must have
all of your private keys, not just one.
Where did you get this number you are calling your private key? How did you get it from the blockchain.info web site?