Extrinsic 16642-1

{
  "heartbeat": {
    "blockNumber": 16640,
    "sessionIndex": 277,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xf0c42066eee83a1e16c95c22c778ca44d98b3950a941b20f861b0eff5952b97bbf2e92cb3c6dfe831a9979d33fd65a978278be39cb230c9f023c2d727f433a88"
}