Extrinsic 28487-1

{
  "heartbeat": {
    "blockNumber": 28485,
    "sessionIndex": 474,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0xb4e0916a90b62af4a46daee7e66619ddc79a6618cd63e297dd96fee56b0a061d44a6b88433335828a7beed2fe1b8cbf9fd6e03b02a985c3f3360dc3cece8e487"
}