Extrinsic 39873-1

{
  "heartbeat": {
    "blockNumber": 39872,
    "sessionIndex": 664,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x160710d20331bb953c800abc900d2780183d2d0ab1fc1aad75fb265661f844713f5a75b194dd1c176581ef5d8abcff41ed34662c95aebdd72a838dd5fee7b68a"
}