Extrinsic 28722-1

{
  "heartbeat": {
    "blockNumber": 28721,
    "sessionIndex": 478,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x744df23755412a34b7f39e654d2fb5690ba139668f1916545b5b93a1e5ed8404466a6ca8f7cedb3a5ca3fb364711870bcbc859302857cb9bccee67bf32009a82"
}