Extrinsic 173921-1

{
  "heartbeat": {
    "blockNumber": 173919,
    "sessionIndex": 2898,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xbeb238c070072875b09ff1fd794e8e48b8363b1402fa12b7f50894ddbe26ae72aebbf19639a8c8168d60a21cbd385e73fae8fdce868445f56d8755239495b18f"
}