engine_forkchoiceUpdatedV1

Updates the forkchoice state

Params

(2)

1. Forkchoice state (required)

headBlockHash

string

required

Match pattern:

^0x[0-9a-f]{64}$

safeBlockHash

string

required

Match pattern:

^0x[0-9a-f]{64}$

finalizedBlockHash

string

required

Match pattern:

^0x[0-9a-f]{64}$

2. Payload attributes

timestamp

string

required

Match pattern:

^0x(0|[1-9a-f][0-9a-f]{0,15})$

prevRandao

string

required

Match pattern:

^0x[0-9a-f]{64}$

suggestedFeeRecipient

string

required

Match pattern:

^0x[0-9a-fA-F]{40}$

Result

(Response object)

payloadStatus

Payload status

required

status

string

required

Set of possible values is restricted to VALID, INVALID, SYNCING

Allowed values:

VALIDINVALIDSYNCING

latestValidHash

string

Match pattern:

^0x[0-9a-f]{64}$

validationError

string

payloadId

string

Match pattern:

^0x[0-9a-f]{16}$

Errors

Code	Message
-38002	Invalid forkchoice state
-38003	Invalid payload attributes

Example

Request

await window.ethereum.request({
  "method": "engine_forkchoiceUpdatedV1",
  "params": [
    {
      "headBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
      "safeBlockHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
      "finalizedBlockHash": "0x3b8fb240d288781d4aac94d3fd16809ee413bc99294a085798a589dae51ddd4a"
    },
    {
      "timestamp": "0x5",
      "prevRandao": "0x0000000000000000000000000000000000000000000000000000000000000000",
      "suggestedFeeRecipient": "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b"
    }
  ]
});

Result

{
  "payloadStatus": {
    "status": "VALID",
    "latestValidHash": "0x3559e851470f6e7bbed1db474980683e8c315bfce99b2a6ef47c057c04de7858",
    "validationError": null
  },
  "payloadId": "0x0000000021f32cc1"
}