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Your copied signature does not show intent by you, instead, it suggests an intent by you, that should be confirmed regardless. For you, this is good, as the principle of redundancy applies: you need something much more than one signature to lock you into a contract, or get you out of prison. And this process of showing intent bounces back to the signature in a particularly powerful protocol that is used in the legal world. This is a closely held secret, but I shall now reveal it and risk censure and expulsion for breaking the code:

Ask!

That’s it, just ask the question. This can happen anywhere, but is best seen in a court setting: The judge says “Did you sign this?” If you did, then you say yes. (Else you’re up for perjury, which is a serious risk.) If you didn’t, you deny it, and then the court has a claim that it is not yours. The court now looks further to establish who’s intent was behind this act.