Cardano Swiftly Recovers From AI-Caused Chain Split

Cardano is facing renewed questions about its network resilience after a malformed transaction triggered a temporary chain split this week.

A pseudonymous X developer known as Homer J caused the November 21 incident and revealed that he relied on artificial intelligence tools.

Why Cardano Experienced a Temporary Chain Split

The developer stated that they had no malicious intent and the action was a “failed personal challenge.”

“I didn’t sell any Ada before my ‘testing in production’ disaster, or short it (don’t even know how to do that) or worked with anyone on this or plan it long and hard. I do have a lot to lose as a consequence of my actions. Sorry, Cardano community, I truly am,” the developer claimed.

In the post-mortem, Intersect, an organization within the Cardano ecosystem, said an oversized hash caused the flaw by slipping through initial validation checks.

This created a temporary fork between the chain carrying the poisoned transaction and a second, healthy chain.

“While the core Cardano protocol remains robust, this edge-case vulnerability provided a vector for the disruption. The transaction was crafted specifically to trigger this bug on mainnet following its earlier discovery on the Preview network, creating a consensus disagreement between nodes that had processed the transaction and those that had not,” Intersect explained.

Intersect said the bug had been masked for years by older ledger versions and standard transaction tooling.

It surfaced only in recent node releases combined with specialized submission methods.

While the split caused many wallets and decentralized applications to become inoperative, block production continued.

“It is important to note that the network did not stall. Block production continued on both chains throughout the incident, and at least some identical transactions appeared on both chains,” Intersect stated.

Following the incident, staking pool operators were instructed to download an updated node release, which enabled the ecosystem to consolidate the two chains back into a single canonical history.

Meanwhile, Cardano’s blockchain founder Charles Hoskinson has hinted that the attacker could face legal consequences for his actions.

“Cardano works so fast that we forked, fixed, and caught the guy all in one day. He was quite active in the Fake Fred discord. It was absolutely personal and now he’s trying to walk it back because he knows the FBI is already involved,” Hoskinson said.

Cardano’s Technology Earns Praise

Cardano’s technology response to the incident drew unexpected praise from outside its community.

On November 23, Solana co-founder Anatoly Yakovenko praised Cardano’s consensus design while hailing the network’s response to the issue.

The Solana network is one of Cardano’s largest rivals, and the two often compete for developer and investor attention.

Yakovenko noted that maintaining network continuity without proof-of-work is “extremely hard,” and argued that the protocol behaved as intended under stress.

His comments stand out in an industry where rival ecosystems rarely commend each other’s architecture.

Cardano developers and operators treated the acknowledgment as validation of the network’s ability to withstand edge-case failures without widespread disruption.

“This whole thing was only possible because of Ouroboros, our Nakamoto-style consensus, and the way the community, SPOs, and the dev teams all stepped up together,” Dori, a Cardano Drep, said.