Which chains suffered outages this week?

TLDR

No major base-layer chains suffered a protocol-level outage this week. The disruption was largely a global Cloudflare incident that broke many crypto front ends, not the chains themselves (Cloudflare outage coverage).

1. Toncoin access was reported as a major outage at the front end during the Cloudflare incident (report).
2. Cardano handled a security incident and a hard fork, but block production continued; some venues paused ADA I/O during the change (exchange update).

Deep Dive

1. Cloudflare Broke Front Ends

A global Cloudflare issue on 18 Nov led to widespread 500 errors that took many crypto sites and explorers offline. Multiple reports highlighted the impact across BitMEX, Arbiscan and other front ends, while base chains kept running as normal (coverage; technical recap).

• Toncoin accessibility was flagged as a major outage in the same window, consistent with front-end dependency on Cloudflare (report).
• Explorers such as Arbiscan and data sites like DeFiLlama showed intermittent errors tied to the provider outage (technical recap).

2. Cardano Incident, Not a Chain Halt

Cardano faced a malicious transaction issue and coordinated a response that included a hard fork, with block production maintained. An exchange temporarily paused ADA and Cardano token deposits and withdrawals during the network change, which is routine risk management in such events (exchange update).

• Community reports stated teams worked in a war room and the chain continued to produce blocks throughout the episode (community note).
• Pauses at venues are a common precaution during forks or security events to avoid settlement mismatches until consensus stabilizes (exchange update above).

Conclusion

This weeks disruptions were driven by centralized infrastructure dependencies. Chains like Bitcoin, Ethereum and others continued operating while Cloudflares outage affected front ends and explorers. The Cardano episode was an incident response with continuity, not a halt.

Confidence: moderate because sources consistently attribute downtime to Cloudflare, and no reputable report confirms a chain-level halt.