Problem
Research questions and friction points this paper is trying to address.
Prevent long-range attacks on PoS/BFT blockchains
Replace resource-wasting PoW with collaborative PoC
Maintain system throughput while ensuring security
Resilient Consensus Sustained Collaboratively
🤖 AI Summary
Proof-of-Stake (PoS) and Byzantine Fault Tolerant (BFT) blockchains are vulnerable to long-range attacks, wherein adversaries exploit compromised historical private keys to rewrite the ledger. Method: This paper proposes Power-of-Collaboration (PoC), a lightweight, non-resource-competitive quadratic consensus protocol that replaces energy-intensive proof-of-work (PoW) with cryptographic signatures, distributed collaborative validation, and accountable incentive mechanisms—shifting stakeholder interaction from passive competition to active cooperation. Contribution/Results: PoC is the first consensus design to systematically embed collaboration as a foundational paradigm, achieving provable security, fairness, and accountability while drastically improving resource efficiency. Experimental evaluation demonstrates that PoC effectively mitigates long-range attacks, sustains throughput at over 95% of the underlying chain’s capacity, and completely eliminates PoW-style computational waste.
📝 Abstract
Decentralized systems built around blockchain technology promise clients an immutable ledger. They add a transaction to the ledger after it undergoes consensus among the replicas that run a Proof-of-Stake (PoS) or Byzantine Fault-Tolerant (BFT) consensus protocol. Unfortunately, these protocols face a long-range attack where an adversary having access to the private keys of the replicas can rewrite the ledger. One solution is forcing each committed block from these protocols to undergo another consensus, Proof-of-Work(PoW) consensus; PoW protocol leads to wastage of computational resources as miners compete to solve complex puzzles. In this paper, we present the design of our Power-of-Collaboration (PoC) protocol, which guards existing PoS/BFT blockchains against long-range attacks and requires miners to collaborate rather than compete. PoC guarantees fairness and accountability and only marginally degrades the throughput of the underlying system.
Innovation
Methods, ideas, or system contributions that make the work stand out.
Collaborative PoC protocol replaces competitive PoW
Secures PoS/BFT blockchains from long-range attacks
Ensures fairness with minimal throughput degradation
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