To scale trust and create
a radically fair economy

Sharding and Staking on Mainnet

Harmony is a fast and secure blockchain for decentralized applications. Our production mainnet supports 4 shards of 1000 nodes, producing blocks in 5 seconds with finality.

Our Effective Proof-of-Stake (EPoS) reduces centralization while supporting stake delegation, reward compounding and double-sign slashing.

Protocol Features

Platform Strengths

Harmony has transcended the blockchain trilemma by bringing the best research to production. Sharding is proven to scale blockchains without compromising security and decentralization.

We divide not only our network nodes but also the blockchain states into shards, scaling linearly in all three aspects of machines, transactions and storage.

To prevent single shard attacks, we must have a sufficiently large number of nodes per shard and cryptographic randomness to re-shard regularly. Each shard has 250 nodes for strong security guarantee against Byzantine behaviors. We use Verifiable Random Function (VDF) for unbiasable and unpredictable shard membership.

Harmony has innovated on the battle-tested Practical Byzantine Fault Tolerance (PBFT) for fast consensus of block transactions. Our Fast BFT (FBFT) leads to low transaction fees and 1-block-time finality in Harmony Mainnet.

We use Boneh–Lynn–Shacham (BLS) constant-sized signatures to commit blocks in a single round of consensus messages. We achieve 5-second block time with view changes in production against adversarial or unavailable leaders.

Harmony Mainnet was launched in June 2019. Our network has produced 10M+ blocks with 20k+ transactions in publicly traded, native ONE tokens.

Harmony has designed a novel Proof-of-Stake (PoS) mechanism for network security and economics. Our Effective Proof-of-Stake (EPoS) reduces centralization and distributes rewards fairly to thousands of validators.

Our staking mechanism supports delegation and reward compounding. To support 100% uptime but fully open participation, EPoS slashes validators who double-sign and it penalizes elected but unavailable nodes.

Harmony Economics Model caps the annual issuance at 441 million tokens (about 3% rate in long term). Our model gives validators a simple and predictable return. All transaction fees are burnt to offset the insurance, naturally leading to zero inflation when our network usage becomes high.

Open Community

Horizon: the Harmony - Ethereum Bridge is live on Mainnet

Horizon is a digital asset bridge allowing users to move assets from Ethereum to Harmony. It is now live on mainnet and is the first piece of our cross-chain ecosystem.

Harmony launches on Binance US feat. Simon Wan

Harmony ONE launches on Binance.US to users based in the United States. In this film, we celebrated great American pioneers and the progress of technology.

Community AMA on Vision and Roadmap

We host a community AMA to discuss our roadmap of building trustless bridges for broader access of users and assets across blockchains.

Open Development

Bridges, Cross-Chain Roadmap & Band Integration, Sep Update

We launched the first version of the Ethereum-Harmony bridge to allow users to migrate assets from Ethereum.

Our team continues to grow our ecosystem with Sandbox and upgraded our mainnet for secure staking epoch transition.

Harmony Roadmap: Cross-Chain & Cross-Exchange Pools

We are building trustless bridges to Bitcoin, Ethereum and Binance chains for broader access of users and assets to decentralized finance.

Our product is a cross-chain exchange. Later we will be putting order books on chain for cross-exchange arbitrage and fiat cash-flow management.

Harmony $7M Grant: Cross-Border Finance & Zero-Knowledge Proofs

Our grants are to drive our platform’s mainnet utility, decentralized community, and cryptographic innovations — aligned with our 2020 roadmap on cross-border finance and auditable privacy.

We allocate 154.2M tokens per month for protocol and ecosystem development.

Founding Team

Stephen Tse
Stephen Tse has been obsessed with protocols and compilers since high school.

He reverse-engineered ICQ and X11 protocols, coded in OCaml for more than 15 years, and graduated with a doctoral degree in security protocols and compiler verification from the University of Pennsylvania.
Rongjian Lan
Rongjian Lan was a search infrastructure engineer for Play Store at Google. He published over 10 academic papers on spatio-temporal querying and map-based visualization.

Rongjian started researching decentralized protocols and sharding in early 2017.
Nick White
Nick White holds bachelor’s and master’s degrees in electrical engineering from Stanford University. 

As a graduate teaching assistant at Stanford, he researched artificial intelligence and applied mathematics with Prof. Bernard Widrow.
Sahil Dewan
Sahil Dewan is a graduate of Harvard Business School, where he served as president of the blockchain and cryptocurrency club.

He has worked at Draper Dragon Fund and advised several blockchain projects.

Ecosystem and Partners


Decentralized Validators

Harmony aims to build an open network of nodes operated and governed by a large community. This node community is called Pangaea.

Are we decentralized yet? There’s no consensus without participation. There are now 1,000 Harmony nodes – so far 640 of them run by the community – in line with thousands of Bitcoin and Ethereum nodes. Pangaea consists of volunteers and validators from more than 100 countries and most of them have never run a node before.

News and Progress

“Harmony recently raised $5 million through an IEO on Binance...the vetting was
far more rigorous than the ICO process, and showed how the industry was maturing.”
"Bringing forward the product from the testnet to the real world is the actual challenge; and Team Harmony definitely possesses the talent to implement their vision."
"Harmony’s core architecture and approach are the right ones to scale blockchain protocol (state sharding and peer to peer networking)"
"Blockchains provide a secure, immutable, and transparent tech infrastructure that allow payment services with extremely low transaction costs."

Milestones and Roadmap

Token Swap, Stablecoins, HRC-721 for Branded Assets

Open Staking, BUSD Stablecoin, EPoS Mechanism

2020 Q3          

Ecosystem Grants, 5-Second Finality, DeFi Middlewares

Fiat Gateways, Staking Wallets, Ethereum Bridges

2020 Q4      

Light Clients, Trustless Bridges, Cross-Chain Uniswap

Decentralized Nodes, On-Chain Makers & Order Books

Cross-Chain Contract Calls, Cross-Exchange Arbitrage

On-Chain Governance, Fiat Liquidity Mining

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