Extrinsic 13521-1

{
  "heartbeat": {
    "blockNumber": 13519,
    "sessionIndex": 225,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x3252c8f1b26ac625838c55089868941eaaae08f0f2b9a5b70149dece2f19d36475868323b19c51a774784a6033b8bb14a1ba4fed32b193f0ecfc95cb6fabc580"
}