Extrinsic 20858-1

{
  "heartbeat": {
    "blockNumber": 20857,
    "sessionIndex": 347,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x7a3648f5698475a457b756b7446cedc3d47972e5f73d8c5677bf87c9099d031b17bd5f5b599da280f584d49f45522129828b924669e17454940f24281d78308f"
}