Extrinsic 15529-1

{
  "heartbeat": {
    "blockNumber": 15527,
    "sessionIndex": 258,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x94b99c842f97c9c48d9eb55b5f0ff72a169a0fe2e6603cb3a5823c55a83e53058af66a6eae8c2dcccf81aa2e860fbfff7babf451e73bcd867eb507fd350e3789"
}