As cross-chain technologies make the interactions among different blockchains
(hereinafter “chains”) possible, multi-chains consensus is becoming more and
more important in blockchain networks. However, more attention has been paid to
the single-chain consensus schemes. The multi-chains consensus with trusted
miners participation has been not considered, thus offering opportunities for
malicious users to launch Diverse Miners Behaviors (DMB) attacks on different
chains. DMB attackers can be friendly in the consensus process of some chains
called mask-chains to enhance trust value, while on other chains called
kill-chains they engage in destructive behaviors of network. In this paper, we
propose a multi-chains consensus scheme named as Proof-of-DiscTrust (PoDT) to
defend against DMB attacks. Distinctive trust idea (DiscTrust) is introduced to
evaluate the trust value of each user concerning different chains. A dynamic
behaviors prediction scheme is designed to strengthen DiscTrust to prevent
intensive DMB attackers who maintain high trust by alternately creating true or
false blocks on kill-chains. On this basis, a trusted miners selection
algorithm for multi-chains can be achieved at a round of block creation.
Experimental results show that PoDT is secure against DMB attacks and more
effective than traditional consensus schemes in multi-chains environments.

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