Harmony is working with exchanges to freeze funds and is preparing a patch after claims that 2.8 billion unauthorized ONE hit trading platforms. Harmony is considering rolling back its blockchain after claims that an attacker exploited the network to mint nearly 4 billion ONE tokens, equivalent to about 26% of the token’s supply. On Tuesday, Harmony said it was working with exchanges to stop and freeze funds. The layer-1 blockchain said it was preparing a patch and evaluating rollback options. Cointelegraph contacted Harmony for comment but had not received a response by publication.