Extrinsic 18702-1

{
  "heartbeat": {
    "blockNumber": 18701,
    "sessionIndex": 311,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0xf08d6d9bf77e79cb37d7aa99b9506ffd7c23483eff4e2df410219f126fb1c110313bc09dd7170431d0da1ce17a928fda574afb6318228265d09bb511a2403d86"
}