Extrinsic 8869-1

{
  "heartbeat": {
    "blockNumber": 8867,
    "sessionIndex": 147,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xda5274647f8041b75627d6f685b882eba58a480fae877f60f12180f4aae9af6c0d5a400bfe42a4748305205b1308122c3432789c79fd9a0b6b93327e9a35768e"
}