Extrinsic 19777-2

{
  "heartbeat": {
    "blockNumber": 19776,
    "sessionIndex": 329,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x2c0497b4f913666bf4a56dceba16d08f77e0518d11b923d3bb114817011c43785427e7d538a74c700de09d5b2e869d76906b8d21a172f245ae1ea49eaebbb38b"
}