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HARDHAT EVM FIX: Resolve mcopy instruction compatibility issue Issue Fixed: ❌ TypeError: The mcopy instruction is only available for Cancun-compatible VMs ❌ Compiling for shanghai EVM version ❌ OpenZeppelin v5.0.2 using mcopy opcode ❌ HH600 compilation failure Root Cause: - mcopy instruction requires Cancun EVM version or later - Previous EVM version was shanghai (doesn't support mcopy) - OpenZeppelin v5.0.2 uses mcopy for gas optimization - EVM version too old for mcopy instruction Solution Applied: ✅ Updated evmVersion to cancun in Hardhat config ✅ Cancun EVM supports mcopy and other new opcodes ✅ Maintains Solidity 0.8.25 compiler version ✅ Preserves optimizer settings for gas efficiency Configuration Changes: - evmVersion: cancun (supports mcopy) - version: 0.8.25 (latest features) - optimizer: enabled with 200 runs - Compatible with OpenZeppelin v5.0.2 Impact: - OpenZeppelin contracts now compile successfully - mcopy instruction is supported - No more HH600 compilation errors - Modern EVM features available - Gas optimizations from OpenZeppelin work - Cancun EVM features enabled This resolves the exact mcopy compatibility issue that was preventing Hardhat from compiling contracts with OpenZeppelin v5.0.2.