Proof of Repute Consensus (PoRC): A decentralized approach to blockchain interoperability

Blockchain networks often face isolation and scalability challenges, particularly when interacting across heterogeneous consensus protocols. This paper introduces Proof of Repute Consensus (PoRC), a decentralized framework designed to facilitate secure and trustless cross-chain interoperability without reliance on third-party bridges. PoRC employs a behavior-driven reputation model, where nodes must maintain a minimum Reputation Score to participate in block proposals. A randomly selected committee of auditors continuously evaluates node behavior using verifiable random selection, enabling accountability without economic collateral. The proposed two-tier architecture decouples intra-chain consensus (Tier-1) from inter-chain collaboration (Tier-2), allowing heterogeneous blockchains to coordinate state updates while preserving their native consensus mechanisms. A comprehensive security framework supported by stochastic modeling is employed to analyze resistance against double-spending, Sybil attacks, and collusion. Experimental evaluation demonstrates that the PoRC interoperability layer sustains an aggregate throughput of up to 8,000 transactions per second across parallel clusters, with an average cross-chain finality of approximately 11 seconds under controlled conditions. These results indicate that PoRC provides a viable architectural foundation for scalable and behavior-driven blockchain interoperability.