The Cardano blockchain experienced its first significant chain split in eight years on November 21, triggered by a developer's flawed test. This incident exposed an old software vulnerability, resulting in two separate ledger states. Major exchanges, including Coinbase, Upbit, and Kraken, temporarily halted ADA deposits and withdrawals. Cardano's core entities, including IOG and the Cardano Foundation, swiftly coordinated efforts to restore the network by November 22. During the disruption, ADA's price fell by approximately 16%. The developer, known as 'Homer J,' admitted to the error, while Cardano founder Charles Hoskinson labeled it a 'premeditated attack' and reported the incident to the FBI. An IOG employee resigned, citing concerns over potential legal risks from routine testing.