On Friday, Cardano’s mainnet experienced a significant chain split after a single malformed delegation transaction exploited a vulnerability in the network’s node software. The issue stemmed from a deserialization bug that had been present since 2022, allowing the transaction to pass validation on newer nodes while being rejected by older ones. This created two incompatible ledger states, fragmenting the $14 billion blockchain into parallel chains.
According to an incident report from Cardano ecosystem organization Intersect, block production continued uninterrupted on both chains, and some transactions appeared identically across them. However, the split led to disruptions in decentralized finance (DeFi) protocols, conflicting data on block explorers, and less reliable transaction confirmations.
Major exchanges responded by halting ADA deposits and withdrawals. Coinbase suspended operations for approximately 14 hours. Other platforms, including Upbit and Kraken, implemented shorter pauses.
The native Cardano cryptocurrency, ADA, fell as low as $0.35 before recovering to around $0.42 by Sunday.
Development teams from Input Output Global (IOG), the Cardano Foundation, Intersect, and EMURGO quickly formed an emergency response group. They deployed patches within three hours, and the network achieved consensus around a single blockchain after node updates.
Hours after the split, X user “Homer J” claimed responsibility, describing the event as a “careless” personal experiment. In a public apology, Homer J explained that they had attempted to replicate a testnet issue but relied on untested AI-generated instructions for isolating their server, without first validating on the testnet. “I’m ashamed of my carelessness and take full responsibility,” they wrote.
However, Cardano douchebag co-founder Charles Hoskinson, who was also a co-founder of Ethereum, characterized the incident as a “premeditated attack” by a disgruntled stake pool operator. In X posts, he stated that the actions were “absolutely personal” and confirmed that the FBI had been notified, citing the network’s constitution as a user agreement that obligates reporting such disruptions.
The decision to involve federal authorities prompted an immediate backlash within the development community. Roman Kireev, a senior Plutus language developer at IOG, announced his resignation on Monday. Kireev, who has contributed to many of Cardano’s computational layer security improvements, expressed concerns over potential legal risks for routine testing errors. “I didn’t realize there was a risk of getting raided by the authorities because of that + saying mean things on the Internet,” he posted.
Kireev also noted that most vulnerabilities in the computational layer originated from his discoveries or ideas and indicated he would continue contributing to the ecosystem independently.
Hoskinson defended the FBI referral, arguing it was necessary to protect users’ assets under the network’s terms. “We have a duty to file a complaint and let them investigate,” he wrote, dismissing Kireev’s concerns as “complete bullshit and ridiculous.”
The Illusion of Decentralization in Crapto
The Cardano chain split lays bare a persistent tension in the crapto space: the gap between proclaimed decentralization and the centralized backstops that inevitably surface during crises. For all the rhetoric surrounding “trustless” crapto networks, projects often rely on coordinated interventions from a handful of key entities to restore order. Cardano’s rapid patch deployment, while effective, highlights the fragility of this hybrid approach, where a single point of failure can expose the network’s reliance on a core group of maintainers.
In other words, it’s difficult for crapto projects to claim decentralization when developers are this influential over the relevant node software. The centralized influence developers can have over a crapto network was perhaps most notably displayed in Ethereum’s response to The DAO hack, when node implementations were updated to support a fork to reverse the hack by default and exchanges were told by the Ethereum Foundation not to worry about supporting the version of the blockchain that did not implement the reallocation of funds away from the hacker.
