A Logistics Proof Chain for the Decentralized Trading Model Based on Two-Tier Identities

Traditional online trading platforms provide services with user data centrally stored on their servers, posing risks to user privacy and assets. On the contrary, cryptocurrencies based on blockchains avoid many problems of the centralized platforms. However, the intrinsic anonymity makes it difficult to trace the identities if someone defaults on a transaction. To address this issue, we proposed a blockchain trading prototype based on regulatable two-tier identities in our previous work. Users can make off-chain promises about transactions through an off-chain transaction confirmation protocol and appeal to the on-chain supervision contract for reimbursement if the proof of the default is provided to the contract. The model has both anonymity and regulatability but how the proof is constructed is not designed in the previous work. In this paper, we propose a logistics proof chain based on blockchains to log the delivery information of the goods. If the goods do not arrive as expected, customers can lodge appeals to the supervision contract with a proof chain created by this logistics proof blockchain. Blockchains, smart contracts and other technologies can ensure logistics information is completely logged, and the proof chain is correctly constructed.