Is this calculation accurate though? Isn't the total number extremely high, like more atoms in the uni? 🤷‍♂️

I saw somewhere there's only 64 bits of entropy in coldcard rng generated seeds. That's not even close to the touted "1/all atoms in the universe" chance of a collision for a 128 bit seed. Like probably less than '1/the atoms in Mars' or something ridiculous like that

No.. not on cold cards that lack entropy.

Unlikely there were collisions becuade they added the device serial number (MCU UID). Collisions would have given the game away. This was an exploit deliberately designed-in.

There are signs.

Even with device serial number it was low entropy. And low entropy is low entropy.

Agree