legal analysis: effective. According to the judicial interpretation of contract law, signature and thumbprint have the same legal effect, as long as it is my own behavior.

signature: a name is a symbol of a citizen and a formal expression of his will and personality. A clear and recognizable signature is an essential element of the law.

legal basis: civil code of the people's Republic of China

article 32 if the parties conclude a contract in the form of a contract, the contract shall be established when both parties sign or seal it.

article 44 a contract established according to law shall take effect upon its establishment. Where the laws and administrative regulations stipulate that approval, registration and other procedures shall take effect, such provisions shall prevail.