Extrinsic 39620-1

{
  "heartbeat": {
    "blockNumber": 39618,
    "sessionIndex": 660,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x04d883f172d1acb6b406c03224a9af2a7ba89eb9ff5b3936c4396f22bb8ae9364e866036f6b1254366305faa1404929d3a8576663b957ec39eb2c2bfc99cda83"
}