Extrinsic 1722-1

{
  "heartbeat": {
    "blockNumber": 1720,
    "sessionIndex": 28,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x608f72db00d613bd33b31c3e9f98f8a7e6654b7f10151f156b6df6b6c5bcc52993fa3faa275eaedd5c3620334de753580b9006c78254d69a28f57383714d0082"
}