Extrinsic 16766-1

{
  "heartbeat": {
    "blockNumber": 16765,
    "sessionIndex": 279,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xa4dc1ba8f2ccfbe99fc787962685378b67dd12b27d2450e81913e54713b85e78555dca00a315797ef45e8e667e811e8bc7c1659dc37b1b1712766746f3eaf586"
}