Extrinsic 28469-1

{
  "heartbeat": {
    "blockNumber": 28468,
    "sessionIndex": 474,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x6427ec30b8ba76cfe5342db2b3dcc5168b6c03f6de57ef0c346c4e8322580253c47e96588dc84f30b4f5dfc255c54cba0bf3a66d4fe029b353337538ef934282"
}