# GPU Contribution/Miner Guide

> ⚠️IMPORTANT NOTICE:
>
> 1. For the security of your assets and personal safety, please ensure all purchases are conducted solely through the website specified above. Our official contract for NavyAI licences is: [https://arbiscan.io/address/0x1286aa258b26813ce1e19e721e3fc449d7bca8a5](https://arbiscan.io/address/0x1286aa258b26813ce1e19e721e3fc449d7bca8a5)
> 2. Your Licenses are not transferable
> 3. If the number of Licenses you aim to purchase exceeds what is available within the current pricing tier, the transaction will not be processed and will be reversed. For instance, attempting to buy 20 Licenses when only 5 are left in the tier will cause the transaction to fail. To complete your purchase successfully, you must divide it into two transactions: one for the 5 Licenses at the current, lower tier price, and another for the remaining 15 Licenses at the price of the next tier.
> 4. Make sure you've selected Arbitrum One as the network in your wallet settings.
