MACT: A multi-channel anonymous consensus based on Tor
Abstract: As the core of blockchain technology, consensus mechanism determines the security, stability and availability of the system. Most of consensus mechanism including Po-X, X-BFT and so on mainly focuses on the design and improvement of the consensus layer, ignoring the impact of the communication mechanism on consensus efficiency and the privacy protection of the consensus node. It leads to the emergence of node corruption and conspiracy attacks. In this paper, we present MACT, a new multi-channel anonymous consensus mechanism for consortium blockchain. MACT uses anonymous communication mechanism, based on Onion Routing Technology Tor, to protect node privacy and prevent the corruption of consensus nodes. To reduce the computational power consumption, MACT abandons the traditional attempt conversion and mining mechanism, and adopts double ring threshold signature. Besides, to achieve the cross chain management of alliance members as well as the privacy protection of the branch chain ledgers, we improve the distributed ledger of MACT based on directed acyclic graph technology(DAG). Additionally, we design a set of identity authentication mechanism NKC for MACT based on the improved Keberos protocol, which is completely independent of the third party public key infrastructure, reduces the probability of Byzantine nodes to a certain extent. The experiment results demonstrate that MACT can achieve anonymous consensus and has good consensus efficiency.
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