Extrinsic 28723-1

{
  "heartbeat": {
    "blockNumber": 28721,
    "sessionIndex": 478,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0xc4333b9f48594af4b9a21f3822ae726ae2739a3fce6873db57c00ed7bda1751eb079cf2a31a158f1ad67177fb7f275c3f6fd58afdfc532d37e0c4861d55bbf8b"
}