The official seal indicates the company's debt, and the signature of shareholders is regarded as a guarantee. Supplementary knowledge: Generally speaking, the IOU with the official seal on it is the company's debt, and the company is naturally responsible for repaying the company's debt. However, it is not uncommon for individuals to borrow money but use the official seal of the company. It can only be that the company shall investigate the legal responsibility of the relevant personnel after fulfilling the repayment responsibility. As a creditor, we only need to rely on IOUs to safeguard our legitimate rights and interests. Legal basis: Article 32 of the Contract Law: When a contract is concluded, if the parties conclude the contract in the form of a contract, the contract shall be concluded when both parties sign or seal it.