Harmony, once pitched as an Ethereum competitor, is shutting down its layer-1 blockchain and migrating its ONE token to Ethereum itself, an unusual voluntary shutdown that its developers blame on the rising cost of defending a small network from state actors and AI agents.
The project announced the plan on Sept. 6 and confirmed it over the following days. Validators can begin shutting down their nodes from 7 a.m. Pacific on Sept. 10. Under the proposal, Harmony will take a snapshot of all ONE balances at the network’s final block and airdrop matching ERC-20 tokens to the same wallet addresses on Ethereum. Holders, delegators and validators need not file claims. The snapshot covers wallets, staking delegations, validator rewards, smart contracts and centralized exchange balances, and Harmony said total supply and the emission rate will remain unchanged.
“The threats posed by state actors and AI agents are too great,” the project wrote on X. “Since our mainnet launch in 2019, our community has been resilient through attacks and changes, but it is time to fully sunset the Harmony network.”
A chain worn down by attacks
Harmony’s security record explains a lot of the caution. In June 2022, attackers stole roughly $100 million from the Horizon bridge, one of the largest DeFi thefts of that year. On Aug. 11, 2026, an attacker exploited a flaw in how the network verified cross-shard transactions and minted more than three trillion unauthorized ONE across six transactions, a sum close to a quarter of supply. Harmony responded with a rollback that erased more than 109,000 transactions from the chain’s history, a controversial fix that undermined the network’s core promise of immutability.
ONE fell as much as 99% from its peak in the months after the bridge theft. CoinGecko now puts the token’s market capitalization near $10.7 million, and DefiLlama shows about $151,000 of total value locked in Harmony DeFi. At that scale, paying for validators, infrastructure and 24/7 security monitoring is hard to justify. The team had reportedly weighed a full token migration before the August incident and settled on the rollback instead. The shutdown proposal turns that fallback into the primary plan.
Retiring a chain is rare
Most failed blockchains die quietly. Developers and users drift away until nothing meaningful runs on the network, and the tokens simply lose their market. Deliberately shutting down a live chain with a formal migration plan is close to unprecedented.
Harmony is not entirely alone. BounceBit discontinued its own layer-1 in August after the theft of 286.5 million BB and reissued the coin on the BNB Chain. But the pattern is emerging for the same reason in both cases: an independent chain must pay for its own security, while migrating to an established network lets it inherit that network’s validator set and economic security for free.
By making ONE an ERC-20 token, Harmony gives up its validator set and rides on Ethereum’s proof-of-stake security instead. The trade is explicit. The project is betting that Ethereum’s security budget, which dwarfs anything Harmony could fund, makes the token safer as a dependent asset than as a sovereign one.
What holders and validators need to do
For regular holders, the answer is: nothing, if their ONE sits in a wallet or on an exchange. New tokens arrive by airdrop to the same addresses, and Harmony said it will work with exchanges to migrate listings.
The exceptions matter. Multisig safes, liquidity pools and onchain applications cannot be migrated automatically. Users with funds in Harmony smart contracts are being urged to exit them before Sept. 10. Delegated stakes and unclaimed rewards will be airdropped into individual governor vaults on Ethereum.
Validators get three options. They can stop their nodes and receive a share of a $1.37 million compensation pool, which Harmony sized to cover the difference in emission rewards between each validator’s final block and the network’s final block. They can stay on as governors in the new structure. Or they can join the project’s next venture, which is where the plan gets strange.
From blockchain to AI video
Harmony says newly issued tokens, which would have gone to validators under the old emission schedule, will instead fund what it calls the Remix Economy for AI Video. The described model is a subscription service where a small group of video creators publish open prompts and assets. Fans fork, or remix, those originals, and AI agents turn each fork into many more clips.
It is a long way from sharding and cross-shard messaging to generative video, and the market’s reaction suggests skepticism. ONE traded down nearly 4% after the announcement, hovering around $0.00073. The token now functions less as a network asset and more as a claim on whatever the team builds next.
The broader read
The shutdown is a small story by market cap but a telling one. Anthropic’s year-long study of 832 accounts banned for cybercrime found the share rated medium risk or higher rose from about 33% in the first half of the study to 56% in the second half, and OpenAI has said its GPT-6 Astra model reached what it calls critical cybersecurity capability. Small chains with thin security budgets are the easiest targets in that environment.
The governance path is also worth watching. Under Harmony’s rules, the proposal requires 51% of total stake weight to participate and 66.7% support after a seven-day introduction and a 14-day vote, and the team has described it as non-binding. If a community can vote a blockchain out of existence, the industry’s assumptions about chain permanence start to look softer than they did a year ago.
Harmony’s answer to hostile AI is to stop being a chain. Whether other small layer-1s facing the same math follow will say more about the industry than anything in the tokenomics of the migration itself.