Extrinsic 18072-1

{
  "heartbeat": {
    "blockNumber": 18070,
    "sessionIndex": 301,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x58617b77bda6d85741ec705db8deb3aa3ddc1e2220e26de5247357f60870ee78ad3838cfccc66d2eadc6b90249d3b252bb8af82d19635c9b86f65d2b98f6738a"
}