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Our work focuses on the design of a scalable permissionless blockchain in theproof-of-stake setting. In particular, we use a distributed hash table as abuilding block to set up randomized shards, and then leverage the shardedarchitecture to validate blocks in an efficient manner. We combine verifiableByzantine agreements run by shards of stakeholders and a block validationprotocol to guarantee that forks occur with negligible probability. We imposeinduced churn to make shards robust to eclipse attacks, and we rely on the UTXOcoin model to guarantee that any stakeholder action is securely verifiable byanyone. Our protocol works against adaptive adversary, and makes no synchronyassumption beyond what is required for the byzantine agreement.

StakeCube: Combining Sharding and Proof-of-Stake to build Fork-free Secure Permissionless Distributed Ledgers