Harmony (ONE) is an innovative, sharding-based blockchain designed to address the pressing concerns of scalability and decentralisation that hamper existing blockchain systems. Launched in 2019 by Stephen Tse, Harmony features a unique, state-sharded architecture that allows it to process transactions and store data across multiple shards, massively enhancing its throughput capabilities. Harmony uses Proof of Stake (PoS) as its consensus mechanism and integrates a distributed randomness generation (DRG) process, ensuring a secure and random shard assignment. With its Fast Byzantine Fault Tolerance (FBFT) consensus algorithm, Harmony achieves finality with low latency and energy efficiency. Harmony also employs advanced networking solutions, such as Kademlia routing and RaptorQ fountain code, to optimise its state synchronisation and communication across shards, making it fully scalable without sacrificing security or decentralisation.