Extrinsic 574-2

{
  "heartbeat": {
    "blockNumber": 573,
    "sessionIndex": 9,
    "validatorsLen": 4,
    "authorityIndex": 1
  },
  "signature": "0x540d337e67cdc7f9c1503caafb5152cd61c379d7f414cc0613f33b38eed8e868ec538470c1b6635c41c2c7980f1a33e1711add6eacb062cb3747fc933b63e185"
}