Domain Proof of Purchase

Hello!

We are in the process of getting an app published and it incoorporates our website. Google is requiering "proof of purchase" for our domain to make sure it's not infringing on anything but I can't find any kind of receipt for the free domain since it's free and all lol.

Is there any way to get some kind of documentation that shows we registered our domain and it is indeed ours. Even if it's a zero dollar receipt of some kind?