Harmony made blockchains fast. Trust took longer.

In June 2022, Harmony could confirm a transaction in two seconds. Restoring confidence would take considerably longer. An attacker had taken roughly $100 million from Horizon, the bridge connecting Harmony to other blockchains. The network’s selling point was speed. The immediate problem was custody: who could authorize money to leave the bridge?

01A very particular kind of speed

Harmony began with a familiar Silicon Valley advantage: people who had already built difficult things. Founder Stephen Tse had worked at Google and Apple; Apple had acquired his mobile-search startup, Spotsetter. Weekly gatherings that started around machine learning turned toward blockchain.

Their diagnosis was straightforward. Decentralized applications asked ordinary people to tolerate extraordinary friction. Waiting for transactions and paying substantial fees made little purchases, game actions and collectible trading awkward. A public network could be philosophically appealing and still feel terrible to use.

Harmony divided the work. Its state-sharding architecture split transaction processing and stored blockchain data across groups of nodes. Fast Byzantine Fault Tolerance helped those nodes agree on blocks. Effective Proof-of-Stake supported validators and people delegating tokens to them. Developers could bring Ethereum-compatible smart contracts rather than learn an entirely different programming environment.

The mainnet launched in June 2019. By December 2020, Harmony announced two-second blocks and finality, using signature aggregation and block-proposal pipelining. That meant a shorter pause between clicking a button and seeing an application respond. For a developer building a game or exchange, the appeal was concrete.

Its market was infrastructure: developers, DeFi participants, NFT projects and network operators. Ethereum, Solana, Avalanche and Ethereum scaling networks offered alternatives. Harmony’s case rested on combining familiar Ethereum tooling with sharding and quick settlement. An announced mutual-investment partnership with Animoca Brands supplied an early route into gaming and digital collectibles.

02The keys were somewhere else

The funding matched that infrastructure ambition. Harmony’s 2019 annual letter reported a private token sale of approximately $18.3 million in 2018. Binance Research also records approximately $5 million from the May 2019 public sale. These were token proceeds. They should not be confused with subscription revenue, customer spending or the company’s operating budget.

ONE powered the network’s economics. Users paid transaction fees in it; validators received token rewards. Protocol fees were burned under the published economic design. The foundation and team had exposure through token holdings. This arrangement made network adoption commercially meaningful without turning Harmony into a conventional software vendor.

Horizon addressed another problem: assets lived on different chains. A bridge let users move value between those systems. But the bridge introduced its own security assumptions. Harmony’s incident summary said attackers compromised at least two of four validator private keys, enough to control bridged assets. The company subsequently strengthened the signing threshold.

The distinction matters. The June 2022 incident did not require making Harmony’s consensus slow or defeating its sharding design. The vulnerable dependency was the bridge’s authorization system. The FBI attributed the theft to North Korea’s Lazarus Group, also known as APT38, in January 2023.

03The community sends it back

The next argument was about the bill. Harmony’s reimbursement proposal described approximately 65,000 affected wallets and 14 asset types. It offered approaches involving billions of newly minted ONE tokens, distributed over three years. The treasury, the team explained, constrained immediate reimbursement. Repairing one group’s losses would expose other holders to additional issuance.

The response changed the plan. A notice atop the proposal says it was withdrawn following community feedback. Subsequent reporting described a revised approach using the foundation treasury. This is a specific instance of outsiders changing management’s course.

That fits the company’s stated culture of open development, public discussion and unusually visible peer feedback. It also shows the limit of that culture: a transparent argument cannot manufacture missing assets. Governance determines how people share a loss after technical safeguards have failed.

“This proposal has been withdrawn due to the feedback by the community.”

Harmony’s reimbursement-proposal notice, 2022

04A different kind of chain reaction

By early 2026, Harmony was still reporting engineering work, including Ethereum virtual-machine alignment and hedging infrastructure. Then came another exploit in August. The company acknowledged the incident and discussed fixes, exchange freezes and rollback options. The old task of keeping an independent blockchain running had become the central strategic question.

In September, Harmony proposed retiring its Layer 1 and moving ONE to Ethereum. Reporting described the proposal as non-binding. The distinction between an announcement and a completed transition is essential: the published plan is evidence of a strategic decision, not proof that every balance and application has moved.

The proposed migration also revealed an awkward product boundary. Tokens held at addresses could be considered for replacement balances. Multisig safes, liquidity pools and applications would not simply travel with them. A blockchain contains relationships and executable agreements as well as numbers. Reproducing the numbers does not reproduce the whole place.

The company now calls its project “The Remix Economy for AI Video.” Its public pitch has creators share prompts and assets, fans choose material to remix, and AI agents extend those branches into more clips. Operators would help generate, distribute and moderate the output. Subscriptions, affiliates and advertising feature in the proposed commercial direction.

That would put Harmony closer to creative production and distribution than to competing on transaction finality. The business still needs people who want those remixes, operators who can supply them economically, and permission to reuse the underlying assets. Large audience ambitions are not customer counts.

05What a builder should take home

There are practices here worth copying: use tools developers already understand; make a performance improvement visible in the user experience; publish decisions precisely enough that affected people can challenge them. There is also a dependency check worth borrowing. Before building on a fast system, ask who controls the bridge, how losses are allocated and what survives a migration.

Harmony’s original wager was that better infrastructure would make an open economy practical. Its proposed second act asks whether openness can organize creative work instead. Both require participation. Neither gets trust automatically, however quickly the machinery responds.