I have not had the time to dive toooo deep yet, but my initial reading indicates the EU standardized on ISO 11784/11785. A blurb on www.europetnet.com says “The search is looking for results in our independed (sic), consolidated database (which is validating via transponders manufacturers), but also in connected member databases around Europe.” so I suspect there is not a unified database.
The US is, as expected, a wild west of protocols. I don’t know yet if Canada is standardized or not, but the paperwork from when we got them chipped says theirs are 15-digit ISO chips.
I have a Proxmark Easy but have not tried it on them yet, I had assumed it wouldn’t work. I’ll try to get that a shot.