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Archived coverage of cloud outages and service disruptions. Reports describe the incident at publication; follow the incident feed for its current recorded status.

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Anthropic Claude API Outage: Understanding and Resolving Invalid Signature Errors in Thinking Blocks

Technical deep-dive into Claude API signature validation failures, their causes, impact on production systems, and practical resolution strategies for developers.

2026-01-23 11:03 UTC•Archived report