Aptos blockchain has down for more than four hours.

On October 19, 2023, the Aptos layer-1 blockchain experienced a major outage in which block production and on-chain transactions halted for more than four hours, later measured at about five hours of downtime. According to the AptoScan block explorer, the network stopped at block 104,621,314, with the last transaction recorded at 7:11 UTC+8, effectively leaving the chain idle and preventing new transactions from being confirmed during the incident. Crypto reporter Wu Blockchain highlighted the halt on X, drawing wider attention to the disruption. The outage prompted major exchanges such as Upbit and OKX to temporarily suspend deposits and withdrawals of the APT token, as the underlying network was not processing transactions. The Aptos team acknowledged the issue publicly, stating that transactions had been impacted and that they were working to restore normal operations; the network was brought back online after developers deployed a fix and validators upgraded their software, allowing consensus to resume. A subsequent post-mortem from the Aptos team attributed the incident to non-deterministic behavior introduced by a performance-focused code change, rather than to network congestion or excessive demand, underscoring the operational and trust implications of protocol-level software changes on a relatively new layer-1 blockchain.

✨ AI-generated background, compiled from web sources — not editorial content.

More coverage

• The Aptos Outage: Understanding the Four-Hour Downtime (altcoinbuzz.io)
• Aptos network resumes operation after five-hour outage - ForkLog (forklog.com)
• Aptos Encounters Issue, Blockchain Remains Idle For Over 4 Hours ... (binance.com)
• Aptos Post Mortems Five-Hour Network Outage Citing Code Issues (beincrypto.com)
• Aptos (@Aptos) / Posts / X - Twitter (x.com)

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