Extrinsic 18682-1

{
  "heartbeat": {
    "blockNumber": 18681,
    "sessionIndex": 311,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x2eb52076b756e33c9ba447ba0391fc9e1e5ccb72221773eddedfcb44000d3a341e0f74756fbf112187ff16837933445858b8bf956b201dc5e49fc7497a3aca87"
}