To verify your public address:
1. Go to https://zillet.io
2. Select Keystore File
3. Select Wallet File and upload your keystore file
4. Enter your passphrase
5. Your public address will be revealed on Zillet - you can go back to UnstoppableDomains.com and verify that it is the same address
You have now confirmed that your keystore file (keys) are connected to the public address presented. The owner of the keystore file has 100% control and custody over the assets associated with that public address. Your keys, your domain!