PROBABLY LESS THAN 400K SELF CUSTODY WHOLECOINERS GLOBALLY.
Also, how can you tell if 1 person controls lots of utxos that add up to more than 1 bitcoin?
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Easy! Run the public electrum server they connect their wallet to.
But if they run a private electrum server on their own node?
It was meant as a joke (and critique).
There are heuristics to determine the amount of users, nothing certain.
Ah ok.