I’m not sure that the process has been finalised yet.
Andy hinted at some of the verification which is being developed but I’ve checked all of the Monzo team’s mentions of address & I can’t find any extra details…
Tom had a great (or not so great) horror story about having to verify his identity when applying for a mortgage recently (5 minutes into the below video) so you can be sure that Monzo hates the idea of physical proof of anything!