1, if the other party breaches the contract and your interests are damaged, the law will not protect you if you sue, because he can declare the contract invalid and he has not signed the contract with you. 2. If you breach the contract and the other party suffers losses, the other party can ask you to compensate for the losses and pay liquidated damages according to the terms of the contract, and the law will protect his interests. He can also sue you for fraud.

Therefore, from a legal point of view, signing a contract under a pseudonym can only be beneficial to the other party and harmful to oneself. Of course, if you specialize in fraud, it is easy to get caught with your real name, but it is more difficult to solve the case with a pseudonym.