It is not the scam. Just a black humor to prove how bitcoin is secured by Mathematics.
The search text input is for searching Page Number ONLY.
We have cancelled the private search text input in case people think that we will record the private key people entered.
It is scam.
For example,
1) I visit page
http://key.btc123.com/134384732473xxxxxxxxxxx294732473247968546 and import one of private keys on it to my wallet
2) I transfer some bitcoins to the address of this private key
3) You see the number 134384732473xxxxxxxxxxx294732473247968546 in your server logs and import
ALL private keys from this page
4) Now you are able to steal my bitcoins. Profit!
to all: NEVER USE PRIVATE KEYS FROM SUCH "DATABASES" FOR KEEPING YOUR FUNDS - THEY ARE NOT SAFE