I generate new address in client. I hear that blockchain doesn't know about it. Blockchain will know about it when I use this address for transaction.
My example: I generate this address(offline): 1J1JqUPqKq4XvrDRioMSMYKrwL3wKdJ1Fe I haven't used yet. How does website blockchain.info know about my address??? https://blockchain.info/address/1J1JqUPqKq4XvrDRioMSMYKrwL3wKdJ1Fe