Legal analysis: signature, seal and fingerprint are all valid. According to the relevant laws and regulations, if the parties conclude a contract in the form of a contract, the contract will be established when both parties sign or seal it. The relationship between signature and seal in this article is optional, that is, the parties can sign without seal, seal without signature, or both.

Legal basis: Article 490 of the Civil Code of People's Republic of China (PRC). If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it. A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.