Legally speaking, the Labor Contract Law clearly stipulates that the employer shall sign a labor contract with the employee, and the employee who has not signed the contract may claim the double wage difference during the unsigned period (the longest is not more than 1 1 month). In the case of arbitration, the company needs to prove that it has signed a labor contract. If the boss asks you to sign a blank contract, you can add something to the blank contract to prove your claim. The content is too casual, which is not good for workers. It is best for workers to confirm this fact by taking photos, recording, etc. Prove that the unit has not signed a real labor contract, and the content added later is not his own meaning. It is best not to print or sign a blank contract, because the content is added at will and the risk is very great. As the salary is paid in cash, it is best to have receipts, salary slips with two accounts and other evidence materials that can prove income. Only through arbitration can we safeguard our legitimate rights and interests.