An actual contract is typically not validated by the hand signature, but by being notarized. A notary is an unaffiliated third party that has been authorized by the state/government to act as a witness to an event. They usually check that the people are who they say they are (check IDs), then witness the signature, then sign the document themselves for the record.
If there is a dispute about who signed the contract, the notary can be subpoenaed to testify that that the defendant was/wasn’t the one signing the document.
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