Finding a way to embed the domain registration date might be sufficient, that would cover most of the expiry situation There was a ietf or similar registry tha

Finding a way to embed the domain registration date might be sufficient, that would cover most of the expiry situation There was a ietf or similar registry that used your domain and registration date to carve out your namespace, ie dns.2021.07.26.com.example would be your prefix. Pretty robust. Can’t remember what it was anymore