Legal Analysis: Valid. If laws and administrative regulations stipulate or the parties agree to conclude a contract in written form, but the parties have not done so in writing but one party has performed its main obligations and the other party has accepted it, the contract shall be established.

Legal basis: "The People's Republic of China and the Civil Code"

Article 465 A contract established in accordance with the law shall be protected by law.

A contract established in accordance with the law is only legally binding on the parties, unless otherwise provided by law.

Article 469: The parties may conclude a contract in written form, oral form or other forms.

Written form is a contract, letter, telegram, telex, fax, etc. that can tangibly express the content contained therein.

Data messages that can tangibly express the content through electronic data exchange, email, etc., and can be retrieved at any time, are deemed to be in written form.

Article 509: The parties shall fully perform their obligations as agreed.

The parties shall abide by the principle of good faith and perform obligations such as notification, assistance, and confidentiality in accordance with the nature, purpose and transaction habits of the contract.

In the process of performing the contract, the parties shall avoid wasting resources, polluting the environment and damaging the ecology.

Article 577 If a party fails to perform its contractual obligations or performs its contractual obligations inconsistently with the agreement, it shall bear liability for breach of contract such as continuing to perform, taking remedial measures, or compensating for losses.

Article 929: In a paid entrustment contract, if the principal suffers losses due to the fault of the trustee, the principal may request compensation for the loss. In a gratuitous entrustment contract, if the principal suffers losses due to the trustee's intention or gross negligence, the principal may request compensation for the loss.

If the trustee exceeds his authority and causes losses to the principal, he shall compensate for the losses

Article 930: When the trustee handles the entrusted affairs, the trustee suffers losses due to reasons that are not attributable to himself. Yes, you can request compensation for losses from the principal.