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Cosmos Hub Blockchain Faces Four-Hour Outage Due to Upgrade Bug
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On June 5, the Cosmos Hub blockchain experienced a four-hour outage due to a bug during the v17 upgrade, highlighting both challenges and resilience within the blockchain community.

Cause and Resolution
The issue was traced to a security flaw in the Liquid Staking Module (LSM). Developers quickly addressed the bug, but block production halted until a majority of validators applied the patch.

The Cosmos team stated:

“Fixes have been issued for the bug. We’re currently at 55% validator implementation. Remaining validators should apply the patch.”

Network Recovery
Block production resumed around 12:30 A.M. GMT. A detailed post-mortem report is planned to provide further insights.

Ethan Buchman, Cosmos co-founder, acknowledged:

“Bugs and downtimes happen. What’s important is having dedicated developers and validators to resolve issues.”

Cosmos Hub’s Vision
Cosmos Hub aims to create an interconnected blockchain network using a proof-of-stake mechanism, allowing participants to stake ATOM coins and earn rewards. Despite the outage, ATOM remained stable at $8.65, showing a slight increase of 0.67%.

v17 Upgrade
The v17 upgrade, a significant update, was supported by over 136 million ATOM tokens (99.8% of votes). This update introduces "partial set security," allowing new consumer chains to customize validator participation. Ethan Buchman described it as “the biggest upgrade in at least a year” with the introduction of ICS2.0.