Ethereum Enters Final Testnet Phase for Fusaka Upgrade Ahead of December Launch

The assessment is 'likely_true' with high confidence based on strong, consistent evidence from multiple high-authority sources.First, the claim that Ethereum has entered the 'final testnet phase' for the 'Fusaka' upgrade is directly supported by primary and secondary sources. The Ethereum Foundation's own blog announced the launch of the Fusaka testnets (Source 1), a critical step in the pre-launch process. This is corroborated by a major crypto news publication, Cointelegraph, which explicitly reported that the Fusaka upgrade went live on the Sepolia testnet, describing it as a 'key phase' before mainnet (Source 4). Further evidence of this advanced stage includes a large-scale public audit contest (Source 2) and technical updates urging preparations for the mainnet launch (Source 5), both from the Ethereum Foundation.Second, the claim that the upgrade is 'scheduled to launch in December' is also well-supported. Multiple reputable news outlets, including CoinDesk (Source 6) and Cointelegraph (Source 4), have reported that Ethereum developers are targeting a December launch for the Fusaka upgrade. While one source notes the roadmap is 'tentative,' this is standard for software development, and 'scheduled' or 'targeted' for a specific month aligns with the common understanding of a planned release.There are no significant contradictions in the provided evidence. Sources that discuss a different upgrade, 'Pectra' (Sources 9 and 10), are correctly identified as low relevance and do not conflict with the information about Fusaka. The overwhelming majority of relevant sources are in agreement, establishing a clear and consistent narrative that supports the original statement.