Extrinsic 38504-2

{
  "heartbeat": {
    "blockNumber": 38503,
    "sessionIndex": 641,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x081431703ac45f88f8b7808dcf58bbfe2ce2db2302b51e754a65808c13303d7579e03087b28054f90b066f4b6ae3e475e6d1cc4f9482719a7be3664f67e52480"
}