Let's say I purchase a domain at RegistrarA, and then I set my domain to use the name servers over at ProviderB since I will be using ProviderB to operate my DNS records.
In the system of ProviderB, I can now manage my domain's DNS records.
My question is, how did ProviderB and RegistrarA communicate the fact that I am the rightful owner of that domain? What is preventing another customer of ProviderB from trying to manage my domain name, now that it's using ProviderB's name servers? Is there some automatic checking of 'company name' or 'owner name' that needs to match on both ends? Is human verification involved?
As far as I know, RegistrarA and ProviderB do not know anything about my account on the 'other' system. I never gave RegistrarA any of my info regarding ProviderB, or vice versa.
I'll sleep better once I understand this.