Haha ok true. I don’t mean that in the ETH sense. I mean that UTXOs have been sent to an address that is related to a private key, which has signed a message, and not thereafter moved. That’s possible to check, right?
No, because that UTXO isn't necessarily theirs anymore
How so since in the hypothetical we’ve already checked that it hasn’t been spent? Maybe.. if they have signed a transaction and broadcasted it but it has yet to make it into a block?
Or if they transferred it off chain
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