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Date of last update: August 8, 2022

Engine API methods

After The Merge, consensus and execution clients communicate with each other using the Engine API. When running Besu as an execution client, use these API calls to communicate with a consensus client.

See the Ethereum Engine API specification for more information.

Methods

engine_exchangeTransitionConfigurationV1

Sends the transition configuration to the consensus client to verify the configuration between both clients.

Note

The execution client runs this call every 60 seconds in the background. The log displays a warning message if the call hasn’t been sent in 120 seconds.

Parameters

transitionConfiguration: object - Transition configuration object

Returns

transitionConfiguration: object - Transition configuration object

Example

curl -X POST --data '{"jsonrpc":"2.0","method":"engine_exchangeTransitionConfigurationV1","params":[{"terminalTotalDifficulty": 0, "terminalBlockHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "terminalBlockNumber": "0x1"}],"id":67}' http://127.0.0.1:8550
{"jsonrpc":"2.0","method":"engine_exchangeTransitionConfigurationV1","params":[{"terminalTotalDifficulty": 0, "terminalBlockHash": "0x0000000000000000000000000000000000000000000000000000000000000000", "terminalBlockNumber": "0x1"}],"id":67}
{
    "jsonrpc": "2.0",
    "id": 67,
    "result": {
      "terminalTotalDifficulty": 0,
      "terminalBlockHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "terminalBlockNumber": "0x1"
    },
    "payloadId": null
  }
}

engine_forkchoiceUpdatedV1

Updates the fork choice with the consensus client.

Parameters

Returns

  • payloadStatus: object - Payload status object

  • payloadId: data - identifier of the payload build process or null

Example

curl -X POST --data '{"jsonrpc":"2.0","method":"engine_forkchoiceUpdatedV1","params":[{"headBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858", "safeBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858", "finalizedBlockHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a"},null],"id":67}' http://127.0.0.1:8550
{"jsonrpc":"2.0","method":"engine_forkchoiceUpdatedV1","params":[{"headBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858", "safeBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858", "finalizedBlockHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a"},null],"id":67}
{
    "jsonrpc": "2.0",
    "id": 67,
    "result": {
      "payloadStatus": {
        "status": "VALID",
        "latestValidHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
        "validationError": null
    },
    "payloadId": null
  }
}

engine_getPayloadV1

Prepares the payload to send to the consensus client.

Parameters

payloadId: data - Identifier of the payload build process

Returns

executionPayload: object - Execution payload object

Example

curl -X POST --data '{"jsonrpc":"2.0","method":"engine_getPayloadV1","params":["0x0000000021f32cc1"],"id":1}' http://127.0.0.1:8550
{"jsonrpc":"2.0","method":"engine_getPayloadV1","params":["0x0000000021f32cc1"],"id":67}
{
    "jsonrpc": "2.0",
    "id": 67,
    "result": {
      "parentHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a",
      "feeRecipient": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
      "stateRoot": "0xca3149fa9e37db08d1cd49c9061db1002ef1cd58db2210f2115c8c989b2bdf45",
      "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
      "prevRandao": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "blockNumber": "0x1",
      "gasLimit": "0x1c9c380",
      "gasUsed": "0x0",
      "timestamp": "0x5",
      "extraData": "0x",
      "baseFeePerGas": "0x7",
      "blockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
      "transactions": []
    }
}

engine_newPayloadV1

Executes the payload with the consensus client.

Parameters

executionPayload: object - Execution payload object

Returns

Example

curl -X POST --data '{"jsonrpc":"2.0","method":"engine_newPayloadV1","params":[
  {
    "parentHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a",
    "feeRecipient": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
    "stateRoot": "0xca3149fa9e37db08d1cd49c9061db1002ef1cd58db2210f2115c8c989b2bdf45",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "prevRandao": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "blockNumber": "0x1",
    "gasLimit": "0x1c9c380",
    "gasUsed": "0x0",
    "timestamp": "0x5",
    "extraData": "0x",
    "baseFeePerGas": "0x7",
    "blockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
    "transactions": []
  }
],"id":67}' http://127.0.0.1:8550
{"jsonrpc":"2.0","method":"engine_newPayloadV1","params":[
  {
    "parentHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a",
    "feeRecipient": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
    "stateRoot": "0xca3149fa9e37db08d1cd49c9061db1002ef1cd58db2210f2115c8c989b2bdf45",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "prevRandao": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "blockNumber": "0x1",
    "gasLimit": "0x1c9c380",
    "gasUsed": "0x0",
    "timestamp": "0x5",
    "extraData": "0x",
    "baseFeePerGas": "0x7",
    "blockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
    "transactions": []
  }
],"id":67}
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
      "status": "VALID",
      "latestValidHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
      "validationError": null
    }
}