Extrinsic 8493-1

{
  "heartbeat": {
    "blockNumber": 8491,
    "sessionIndex": 141,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xee244372dedf4e6fb61fe877e656094a7c440e273ed216b9859997beab834c2a453e3232d956f7458f33cc85a1c5ae6ffbf78833935235f9f0059356493a2e8f"
}