What was the safety statement in Three-body 3 to avoid the Dark Forest attack? Did the Earthlings think of it?

In the " Three-Body " series of novels, the safety statement to avoid the attack of the Dark Forest meant that when the extraterrestrial civilization contacted and communicated with the Earth civilization, the Earth civilization must carry out a certain degree of propaganda and display to the extraterrestrial civilization to make them aware of the existence and intentions of the Earth. At the same time, it must maintain a certain degree of mystery and unpredictability to avoid being regarded as a potential threat and attack target by the extraterrestrial civilization. This security statement must contain some features that could attract the interest and attention of the alien civilization, such as the culture, technology, history, and values of Earth's civilization. At the same time, it must maintain a certain degree of uncertainty and unpredictability to avoid being regarded as an attack target by the alien civilization. In " Three-Body 3: Dark Forest," the Earth civilization proposed the " Earth's Past " project to achieve this security statement. The purpose was to show the existence and intentions of Earth to other alien civilizations while maintaining a certain degree of mystery and unpredictability. The specific effects of this plan had not been fully demonstrated, but it could be seen that the people on Earth had initially come up with a safety statement to avoid the attack of the Dark Forest and had made some attempts and explorations in the communication and display of alien civilizations.