Kronos: A Secure and Generic Sharding Blockchain Consensus with Optimized Overhead
Yizhong Liu
Network and Distributed System Security (NDSS) Symposium 2025 · Day 1 · Blockchain Security 1
This talk introduces **Kronos**, a novel sharding blockchain consensus protocol designed to address the critical scalability and security challenges inherent in existing sharded blockchain architectures. Presented by Yizhong Liu, Kronos aims to provide a generic, secure, and efficient solution for handling cross-shard transactions, which are a major bottleneck for blockchain networks seeking to achieve high transaction throughput. The work is particularly significant given the increasing volume and value of multi-input transactions on platforms like Ethereum, estimated at billions of dollars, and the observation that cross-shard transactions quickly dominate transaction types as the number of shards grows beyond a modest threshold (e.g., 16 shards).
AI review
Kronos is a legitimate academic systems paper solving a real distributed systems problem — cross-shard atomicity overhead in BFT-based blockchains. The technical contribution is genuine: shaving a BFT round from the input-shard path, using erasure codes plus Merkle proofs to kill the O(N²) communication problem without collapsing to a single-point-of-failure leader. Solid work, but this is a conference paper presentation, not a security talk — and in that lane, it's competent but unremarkable.