Extrinsic 20374-1

{
  "heartbeat": {
    "blockNumber": 20372,
    "sessionIndex": 339,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xe8ab51a0b95350871426270caeb6cd740299e64a17ed7987458c1a4bb106d9060957ec745a7aca74f9bae2460b64e829430999caa8ace64cb780160ab6bf0e88"
}