Extrinsic 17731-1

{
  "heartbeat": {
    "blockNumber": 17729,
    "sessionIndex": 295,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x887c560304e24604f2dd94911e0ef0ae3c2bcc673da667721cd600e2674fd24afe78cb8f928ac7ce6a29b875ec79c27d2bacc09eb8aa5a729251968ae35a5d84"
}