Any tips on the beginning of your hexadecimal keys? One more, besides 4 to 7, would already help with the brute force. Haha. Who knows, maybe I'll find the 71 too? Hehehe.

alert('test')

test12345

testabcd

you can click, fake link.

test button

Click to see the spoiler
The answer is the least significant bit!

It's still a test, calm down.