LibreChain is the world's first blockchain project based on the social behavior consensus mechanism (PoSA mechanism, also known as PoB mechanism). Compared with the proof-of-work mechanism, the PoSA mechanism does not have the disadvantage of high energy consumption, is greener, and is easier to promote. Compared with the proof-of-stake mechanism, the participants of the PoSA mechanism can do without capital investment, avoid capital disks, and have no market makers, which is more assured; In addition, the native librechat (secret chat) that was launched at the beginning of the establishment of the Libre chain should be librechat; The libreDAO (community) makes the libre chain naturally have decentralized social attributes, and with the blessing of the encrypted privacy protection technology derived from the famous Monero, it can make the communication between users in the libre ecosystem smoother and more secure. LibreChain is also the world's first block project to adopt a dual-channel model to seamlessly access the traditional business ecosystem.