Extrinsic 18433-1

{
  "heartbeat": {
    "blockNumber": 18432,
    "sessionIndex": 307,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x1c9e054a7a1881d57fe205b61e52071e4422af0959f85199d57400b7a2495c60234264288ff01029478ce21bdf28e2d25ca15f2b54a56aee2d5a1c1a61907d85"
}