Extrinsic 397-1

{
  "heartbeat": {
    "blockNumber": 396,
    "sessionIndex": 6,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xa4d17d4cac1d4d92e934fe1cd37657a80ac3303ceb8428eda452520cf42c44422564e9ea3b1a568b8923fd414b43b93ca9e372d7f41e88f3353cfbb5d254148a"
}