Welcome, inmate, to the most secure prison around, Ender Prison.
In a prison server, you must earn money by any means possible. This includes: mining, auctioning, selling your items, and pvping! Once you have accumulated enough money, use the command /rankup to buy your way into the next block. Once you make it through each block, you will eventually be able to buy your freedom!!! :D
Each block has a slightly different mine, each becoming higher in monetary value. For example, block A mine might have iron ore, coal ore, and cobblestone, while block Z might have emerald blocks, diamond blocks, and beacons!
In this prison server we also have plots, which allow you to build whatever you want! Some players will set up shops in their plots to help you out and make a little extra money on their own!
Another tactic is donating. When you donate, you help keep the server alive (each donation goes straight to the server) and helps you too! When you donate you get access to a special mine, you get an OP kit which helps a lot, and a suffix by your name letting everyone in the server know that you donated!
So what are you waiting for? Get that IP and obtain your freedom!!!