Originally Posted by grail
I am not sure what 'Tails' is, but generally most places provide a md5sum which you can check the image against prior to burning.
If this is not what you mean by verify, you may have to explain further?
Tails is sort of like the tor operating system. It boots live, and automatically encrypts and relays through tor all of the outgoing internet traffic. Go to the Tor site and there should be a tails page somewhere that you can look at.