Extrinsic 18214-1

{
  "heartbeat": {
    "blockNumber": 18213,
    "sessionIndex": 303,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x1c5c41ecbcb8aa03e53e4564a607b6215ac24ce7180c46fe14772819fee84b73a8bc164db9b65de4c18bd40d70dcf9c64f1a55f944dd5473f81ca31b31755a89"
}