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We propose Shard Scheduler, a system for object placement and migration inaccount-based sharded blockchains. Our system calculates optimal placement anddecides of object migrations across shards and supports complex multi-accounttransactions caused by smart contracts. Placement and migration decisions madeby Shard Scheduler are fully deterministic, verifiable, and can be made part ofthe consensus protocol. Shard Scheduler reduces the number of costlycross-shard transactions, ensures balanced load distribution and maximizes thenumber of processed transactions for the blockchain as a whole. It leverages anovel incentive model motivating miners to maximize the global throughput ofthe entire blockchain rather than the throughput of a specific shard. ShardScheduler reduces the number of costly cross-shard transactions by half in oursimulations, ensuring equal load and increasing the throughput 3 fold whenusing 60 shards. We also implement and evaluate Shard Scheduler on Chainspace,more than doubling its throughput and reducing user-perceived latency by 70%when using 10 shards.

Shard Scheduler: object placement and migration in sharded account-based blockchains