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
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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
