Hi there,
This was the result of a DDoS attack on Squarespace yesterday. Most of the attack came from tinet.net, which is one of the carriers for the ISP you're using. Due to security measures we have in place, you're seeing a block for your IP, but your site is up and running. You can check this by accessing:
http://www.downforeveryoneorjustme.com (
http://www.downforeveryoneorjustme.com)
The engineers are working on getting the block resolved as soon as possible -- we appreciate your patience and understanding.
Hope this clarifies!