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Stellar’s ‘decentralized’ blockchain crashed for 2 hours and nobody realized

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Stellar’s blockchain suffered a “cascading failure” that halted transactions for roughly two hours on May 15.

“What basically happened was that a critical mass of nodes went down causing a cascading failure and so the entire network went down but because it isn’t frequently used, few noticed,” tweeted Swanson, head of research at technology firm Post Oak Labs.

The downtime was confirmed by a Stellar XLM Foundation rep in a Reddit post. According to network monitoring services, the blockchain appears to be back to normal (at pixel time.)

Members of Stellar’s public chat channel were wondering what’s causing the downtime.

Cybersecurity experts have been tracking the Stellar blockchain’s issue with cascading failures, which happen due to its overt reliance on a small group network participants to validate transactions.

“[…] If two centralized nodes can not receive or send any message because of DDoS, then all nodes in Stellar network will be blocked and can not move to the next step in the consensus process,” reads their paper.

Tomer Weller, solutions architect at the Stellar Development Foundation, confirms the issue.

Stellar chief scientist and Stanford professor David Mazières agreed that this was a concern, especially with regard to decentralization (or an apparent lack thereof.)

“To the extent that Stellar is centralized, the question is whether the validators at the center of the network actually reflect the most important anchors and exchanges,” he wrote in a blog post. “This is currently a weak spot in the Stellar ecosystem.”

Hard Fork has reached out to Stellar to learn more about the cause of its most-recent cascading failure, and will update this piece should we hear back.

Published May 16, 2019 — 09:20 UTC

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