They just have to control the private keys.
Discussion
For ndividuals,how does on know he/she/they control the private keys?
You don’t
Why?
Privacy, this is how Satoshi Nakamoto wrote the code.
So how does one know they own Bitcoin?
You dont
hmm?
How can companies/exchanges like Coinbase/Binance/Microstrastegy/etc claim they own Bitcoin?
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How does jack mallers know he has Bitcoin?