The design is nice and sleek, but if why would one use your service? Most wallets support this feature, so I find it unnecessary and unsafe sweeping on an external site (site launched by a newbie doesn't get trust here). I think you'd do better using your coding skills (as I mentioned earlier, the site design is very pleasing). And I'd say the vast majority (almost 100%) of people who use paper wallets or other means of cold storage do it for safety and security reasons.
It's easy and fast.
Also you can enter in the site from TOR without problems.
So if you want high level anonymous just use
https://bitsweep.orgCheers
You did not give explanation why one should prefer your site over wallets' features. Almost every wallet out there you can sweep wallets in, without compromising the security of your private keys (putting them in a website, such as yours here).
I feel almost like this is a method of obtaining peoples' private keys for the purpose of things like CLAM (where he could check the addresses to see if they had a balance). Not saying that's what's happening, but it was the first thing to come to mind...
Regardless, the #1 rule to crypto is NEVER GIVE YOUR PRIVATE KEY TO ANYONE.