Ethereum Classic's Olympia Upgrade — April 2026 Development Checkpoint

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Olympia Upgrade — April 2026 Checkpoint The Olympia upgrade is built and entering final testing. Three execution clients now carry full Olympia support: 🟢 Fukuii — New ETC-native execution client built from the ground up 🟠 Core-Geth — Legacy client, maintenance mode 🔵 Besu — Reference client All three implement the core Olympia protocol changes: 🟢 EIP-1559 fee market activation — modern…

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