The Polygon team pointed out that the Polygon Heimdall V2 mainnet, as the consensus client for the Polygon proof-of-stake chain, experienced downtime on Wednesday due to a suspected "consensus vulnerability." The service has now been restored to normal.

According to the latest report from Polygon, Heimdall V2, which is responsible for handling communication between validators of the Polygon network nodes, went down around 9:30 UTC, but it did not affect the Bor layer used for block production and transaction processing.

A Polygon spokesperson revealed to Cointelegraph that the interruption lasted for one hour and was caused by an unidentified validator exiting the network.

Throughout the downtime, block production on the Bor mainnet continued to operate, and any discrepancies between the network's actual uptime and data from the block explorer have now been resolved. The Polygon spokesperson stated:

For a blockchain network positioning itself as a borderless alternative to traditional finance, continuous and stable network operation is crucial, as such networks need to remain available 24/7 throughout the year. However, as network complexity increases, the challenges of maintaining stable uptime also grow.

The Heimdall V2 upgrade was launched in early July, reducing final confirmation time to about 5 seconds and fully upgrading the network's technical architecture, now operating based on CometBFT and Cosmos-SDK v0.50.

Polygon co-founder Sandeep Nailwal noted in a post on the X platform on July 8: "This is the most technically complex hard fork the Polygon proof-of-stake (PoS) network has experienced since its launch in 2020."

While reducing block generation time and increasing network throughput remain key focuses for the development of blockchain networks, performance enhancements also introduce higher complexity and more potential points of failure into the system.

Heimdall V1 was also the source of network downtime issues. In March 2022, Polygon experienced several hours of service interruption due to errors in the Heimdall layer.

At that time, the Polygon team explained that the Heimdall V1 issue was caused by a software bug that led validators to use different versions of the blockchain.

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Original article: “Polygon Heimdall Mainnet Experiences Temporary Outage”

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