Extrinsic 18126-1

{
  "heartbeat": {
    "blockNumber": 18125,
    "sessionIndex": 302,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xa4a1b5b75527184881c6fa3a7069e419a3f90487ed83ecd6d493b564346eff063eb29bce9ec32d2ea16a5392db7a1e9f42570aa98811fc0ba127af8a4bf1f980"
}