MAC chain makes use of the non-tampering and decentralization of block chain data to realize the traceability of commodities and eradicate the problem of fake and inferior commodities in the process of commodity circulation. Every commodity, transaction and comment is recorded in the blockchain ledger, which is open, true and transparent. We call this new block chain e-commerce-chain business! On the chain business platform, users and users are a node, linked together to form a community. The MAC chain of the node can be calculated as a measurement system by comprehensively evaluating the index of credit, manpower and computing power of the node. Compared with traditional e-commerce, on the chain retail platform, users' shopping, promotion, investment and other behaviors can be motivated by MAC chain. MAC chain on behalf of the user to hold the number of the platform's equity, chain stock dual holding, chain stock with the right!