Extrinsic 39878-1

{
  "heartbeat": {
    "blockNumber": 39876,
    "sessionIndex": 664,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xb67d300d24be6326908d86b5e010b4eb5ed49ad2520630e60b428d6d05e4314ac569a1f797bc49bbf4be34add8367a8a339083df57263dd9a97f19af27a9a78a"
}