{
  "chainId": $L1_CHAIN_ID,
  "metadata": {
    "name": "Holocene Hardfork - SystemConfig Upgrade",
    "description": "Upgrades the `SystemConfig.sol` contract for Holocene."
  },
  "transactions": [
    {
      "metadata": {
        "name": "Upgrade `SystemConfig` proxy",
        "description": "Upgrades the `SystemConfig` proxy to the new implementation, featuring configurable EIP-1559 parameters."
      },
      "to": "$PROXY_ADMIN_ADDR",
      "value": "0x0",
      "data": "$TX_1_PAYLOAD",
      "contractMethod": {
        "type": "function",
        "name": "upgrade",
        "inputs": [
          {
            "name": "_proxy",
            "type": "address"
          },
          {
            "name": "_implementation",
            "type": "address"
          }
        ],
        "outputs": [],
        "stateMutability": "nonpayable"
      },
      "contractInputsValues": {
        "_proxy": "$SYSTEM_CONFIG_PROXY_ADDR",
        "_implementation": "$SYSTEM_CONFIG_IMPL"
      }
    }
  ]
}
