Extrinsic 39647-1

{
  "heartbeat": {
    "blockNumber": 39645,
    "sessionIndex": 660,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x4c131802f48bbe6c94bbe17a5f648f0bbbddefbf22b34ff8649edc5af6b5e5364cb2c1cba853072ceba0a2305638c723f23c94a0560aa0f6992c5a27628dbe84"
}