But they can be copy/pasted?so can't anyone just copy/paste the digital signature and claim its theirs?

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Nah, can't do that. Signatures are tied to transaction data. Change the data, signature invalidates.

No copycats allowed! 🚫🐱✂️

So if one has digital signature,how does it prove bitcoin ownership,if these digital signatures are public and can be copy/pasted?