The RSK whitelist is a list of addresses registered by people, projects or entities that are considered to be acceptable or trustworthy to use the 2-way peg mechanism.
For both MainNet and TestNet, you need to be whitlisted to operate with the federation.
The whitelist process is a mechanism to gradually open our platform. We will remove this process and the platform will be wide open soon.
For Testnet, we keep this process to emulate exactly what should it be done in Mainnet for testing purposes.
You must complete this Google Form and we will contact you.
You can contact us in any of our Gitter channels and ask us for the whitelisting. Keep in mind that whitelisting in TestNet is just for testing the 2-way-peg component. If you only intend to test your smart contracts, you can get funds for your RSK Testnet address from the faucet.
Once you are approved, you can proceed to convert your BTC to RBTC.