Legal subjectivity:

Generally speaking, a signature is enough. It would be better if the signature is coupled with a fingerprint. Many times, in order to prevent future disputes between the two parties over key numbers, dates and other important information in the IOU, both parties will choose to place their fingerprints on key locations in the IOU to show their approval of the content. Usually the places that need to be fingerprinted on the IOU are the name, amount, and date. Article 490 of the Civil Code: Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint the contract. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it. Laws and administrative regulations stipulate or the parties agree that a contract should be concluded in written form. If the parties do not use written form but one party has performed its main obligations and the other party accepts it, the contract is established.