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5:00Not Your Keys, Not Your Coins
On the blockchain there is no "account in your name". There is only a balance sitting at an address, and whoever holds the private key can move it. So the real question is never "do I own crypto?" but "who holds the key?"
A blockchain does not store "Alice owns 1 BTC". It stores a balance at an address, plus a rule: this balance can only be moved by a transaction carrying a valid digital signature. That signature can only be produced by the matching private key. So ownership is not a name on a ledger, it is control of a key. This is the whole meaning of *not your keys, not your coins*: the key is the coins.
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