The Internet of Things (IoT) blockchain Helium shut down for about 4 hours on Monday due to validator outages from a software update, causing delayed transaction finality.

During the outage, devices transferring data over the network were not affected, but miner rewards and token transfers were left pending. The team resolved the issue by skipping the blockchain forward by one block and resuming normal functions.

At 10:20 am EST, the Consensus Group stopped producing blocks at block height 1435692 on the Helium blockchain, according to a status update. Lacking network consensus, token transfers could not be completed, and new blocks were not being produced.

Helium is an IoT network that uses physical radio hotspots to allow users to connect to their devices from anywhere there is radio coverage. On the Helium network, a Consensus Group consists of 43 validator nodes randomly chosen in fixed intervals to provide network consensus.

In the postmortem for the event, Helium engineers cited two reasons validators stopped creating consensus on the network.

First, an issue with a Friday software update for validators contributed to the problem. The v1.12.3 update was designed to provide support for the 5G Mobile subnetwork and its MOBILE token.

Additionally, a “local network outage” was also to blame. In the project’s Discord channel, Helium moderator Digerati explained that a high concentration of validators randomly chosen as…

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