Legal analysis: the signature on blank paper by handprint has no legal effect. Because the essence of the contract is the product of the agreement between the two parties. However, it is invalid to sign by fingerprint on blank paper, because there is no offer and commitment from both parties. It is easy to bring legal risks to yourself by signing and fingerprinting on blank paper. It is recommended not to sign and fingerprint on blank paper.

Legal basis: Article 464 of the Civil Code of People's Republic of China (PRC). A contract is an agreement between civil subjects to establish, change and terminate a civil legal relationship. Agreements on status relations such as marriage, adoption and guardianship shall be governed by legal provisions on such status relations; If there are no provisions, the provisions of this part can be applied according to their nature.