Extrinsic 18986-1

{
  "heartbeat": {
    "blockNumber": 18984,
    "sessionIndex": 316,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x6023fa55366abdbde13f22e1c739691554952e7e1537d97183699aabe873b850cdaecce7a878954b35260aa46cebd07a3192e1ba719421c7791d55112c27cd83"
}