Extrinsic 19125-1

{
  "heartbeat": {
    "blockNumber": 19123,
    "sessionIndex": 318,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x281a039c103283f03c02be4a5b3e164e8888659cded07b839363d81ded452f37d7a39dec3565e7c21e7816c2d7779e434ab6d340ab5a43b6e2bad5e72090a383"
}