Cardano Blockchain Split After Exploited Delegation Transaction Bug

Cardano Blockchain Split After Exploited Delegation Transaction Bug

A malformed transaction targeting Charles Hoskinson’s personal stake pool caused a chain split, exposing network vulnerabilities and sparking debate over whether it was reckless experimentation or calculated sabotage.

ADA

Fact Check
The assessment that the statement is 'likely true' is based on a strong consensus across multiple high-authority sources, with no conflicting evidence presented. The most definitive piece of evidence is the official incident report from Intersect, a primary source with maximum authority and relevance. This report explicitly confirms that a 'network partition' (a technical term for a chain split) was 'caused by a malformed delegation transaction exploiting a bug.' This single source provides direct validation for every component of the user's statement.This primary account is corroborated by numerous secondary sources from reputable crypto news publications, including The Block, ZyCrypto, and a report on Yahoo Finance. These outlets independently report the same sequence of events: a malformed or crafted delegation transaction exploited a known bug, resulting in a chain split. The consistency across these independent reports significantly strengthens the claim's credibility.Even sources with lower authority, such as a social media post and a news summary from Whale-Alert, align perfectly with the narrative established by the more credible sources. The only source that is disregarded is the legal alert concerning IRS rules, as it is entirely irrelevant to the event. There are no credible sources provided that contradict the statement. The overwhelming weight and consistency of the evidence, led by an official incident report, make the statement highly probable.
Summary

On November 21, 2025, the Cardano network was disrupted for several hours after a malformed transaction targeting founder Charles Hoskinson’s personal stake pool caused a chain split. The transaction exploited a 2022 cryptographic library bug, leading newer nodes to misinterpret it while older ones rejected it. Validators, stake pool operators, and DeFi applications faced alignment issues, with some operators losing block rewards and applications experiencing inconsistent states. While user funds remained safe, the incident triggered conflicting narratives: the stake pool operator claimed it was a reckless experiment with no malicious intent, while Hoskinson asserted it was a deliberate attack by someone active in anti-Cardano groups. Law enforcement is involved, and the event has intensified scrutiny over network resilience.

Terms & Concepts
  • Delegation Transaction: In proof-of-stake blockchains like Cardano, a transaction where a user assigns their stake to a validator to help secure the network.
  • Network Split: A disruption where a blockchain's nodes diverge into separate chains due to software bugs or consensus failures.
  • ADA: The native cryptocurrency of the Cardano blockchain, used for transactions and staking.