It can be usable when we have wallets and bitcoins on different websites like xapo, coinbase or etc. We are going to send bitcoin to someone, check adress, oh it's xapo's, so we send from xapo without fees. That's ok.
But your title and claims isn't what your website does, for determining of ownership, I prefer to use blocktrail, it shows btc adress posted on bitcointalk.