This script didn't roll automatically. Instead, it analyzed the server seed hash. Since FreeBitcoin releases the server seed in advance (in a hashed form), the script would pre-calculate the next 10,000 nonces. If a roll of 0 was coming up within the next 100 rolls, the script would alert you to roll manually. This was possible, but:
The winning number is not decided on your computer or inside your web browser. When you click the roll button, a request is sent to FreeBitco.in’s secure servers. The server calculates the random number using a cryptographically secure system and sends the result back to your screen. Because your browser only displays the result rather than generating it, code running on your computer cannot alter the outcome. Provably Fair System freebitcoin roll 10000 script 2019 hot