Fluidity (FDT) is a public chain game ecosystem based on a multi chain architecture, in which digital goods can be sold as liquid assets using trust free (i.e. fully secure) smart contracts executed based on blockchain technology. FDT mainly serves the three major entertainment industries of gaming, esports, and film and television, with each industry forming three independent sub chains. Different from the traditional side chain architecture, in the FDT multi chain system, all chains do not need to synchronize the main chain data, and share the same set of virtual Cryptocurrency FDT. The maintenance system infrastructure and related technology research and development are exchanged and encouraged around FDT. FDT is required as the only value exchange tool, whether users participate in consumption, project parties raise funds, Content creation release content, or advertisers place advertisements. In the FDT basic main chain, the default consensus mechanism is POS+PBFT, which compensates for the shortcomings of DPOS towards "centralization" and "enrichment" and achieves true decentralization....