The promisor's signature on the letter of commitment is legally binding. The signing of both parties to the contract indicates that the intention is consistent, the offer and acceptance have been completed and the contract is established. However, if both parties agree that the contract must be established in the form of seal or handprint, this agreement is valid. In this case, the contract was not established before the seal or fingerprint was stamped, and there was no situation that one party fulfilled its main obligations and the other party accepted it.

Legal analysis

Letter of commitment, if the obligation is unilaterally set, the obligor must sign it (the legal person or organization should seal it). The counterpart of acceptance is a simple obligee, and the absence of signature by the obligee does not affect the validity of acceptance. For example, for the transfer of unilateral rights, the transferee of rights need not sign, but should inform the obligor of the transfer of rights. Therefore, the commitment letter only needs one person to sign. According to the relevant laws and regulations, it mainly explains the conclusion, effectiveness, performance, termination of rights and obligations and liability for breach of contract: if the parties conclude a contract in the form of a contract, they shall sign or seal it. If the parties press their fingerprints on the contract, the people's court shall determine that it has the same legal effect as the signature or seal. A legally established contract shall take effect upon its establishment. Where laws and administrative regulations stipulate that examination and approval, registration and other procedures shall be handled, such provisions shall prevail. If the failure to go through the formalities such as approval affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party that should go through the formalities for approval fails to perform its obligations, the other party may require it to bear the responsibility for violating its obligations.

legal ground

People's Republic of China (PRC) Civil Code

Article 502 A lawfully formed contract shall become effective upon its formation, unless otherwise provided by law or agreed by the parties. In accordance with the provisions of laws and administrative regulations, if the contract should go through the approval procedures, such provisions shall prevail. If the failure to go through the formalities such as approval affects the effectiveness of the contract, it will not affect the performance of the obligation clauses such as approval and the effectiveness of relevant clauses in the contract. If the party that should go through the formalities for approval fails to perform its obligations, the other party may require it to bear the responsibility for violating its obligations. The modification, assignment and dissolution of a contract shall be subject to the provisions of laws and administrative regulations, and the provisions of the preceding paragraph shall apply and shall be subject to approval.

Article 503 Where an unauthorized agent enters into a contract in the name of the principal, and the principal has started to perform the contractual obligations or accepted the performance of the other party, it shall be deemed as ratification of the contract.

Article 504 A contract concluded by the legal representative of a legal person or the person in charge of an unincorporated organization exceeds its authority, unless the other party knows or should know that it has exceeded its authority, the representative's behavior is valid, and the contract concluded is valid for the legal person or unincorporated organization.