Extrinsic 4407-1

{
  "heartbeat": {
    "blockNumber": 4405,
    "sessionIndex": 73,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0xae7a5d2a3efd06ec5e2ea8fb85f2e849653111397b6a06c8a4e157d4e7cce20c2aee4249ca7188e1904f50a9e38d8e6bcc2fc6cbbbf53c7c9b3c863b13fd4e8d"
}