Extrinsic 39817-2

{
  "heartbeat": {
    "blockNumber": 39815,
    "sessionIndex": 663,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x4c54fe0a04698a41e4b9824c61432b2333e61264441de39cea1b3e7d468c4e2b78d2ee0a68537145975eacdd1f732b75c57c49a6f85e224635f85f09d2157986"
}