Extrinsic 2738-1

{
  "heartbeat": {
    "blockNumber": 2737,
    "sessionIndex": 45,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x62b3b7eb3337bc816135372ea3d1456f8e592e7f84742a473763c0babb7bbc6a3d0e368ac8723e5b1e2757516d98e7f082ca81a722223e2e6b344a77dbc12a8b"
}