Using Multi-dimensional Quorums for Optimal Resilience in Multi-resource Blockchains
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Permissionless blockchains commonly use resource challenges to defend against sybil attacks. For example, popular resource challenge designs include Proof-of-Work and Proof-of-Stake. It is well-known that simultaneously exploiting multiple resources can help make a permissionless blockchain more robust. Existing efforts along this direction, however, all fail to provide a complete answer to the central question of how to combine PoW and PoS, or multiple resources in general, to achieve optimal resilience. As our central contribution, this work gives complete answers to this central question.