Extrinsic 1667-1

{
  "heartbeat": {
    "blockNumber": 1666,
    "sessionIndex": 27,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xc85c192f8c52385f74dd9cc9fc7ed57b1562f3c0eb920febc2f9a68c793ef3615750cb0abe57d7757613cbbc28ea23004f0153c9cf9f5a5cbd6ff6de3d0a6286"
}