Extrinsic 28533-1

{
  "heartbeat": {
    "blockNumber": 28531,
    "sessionIndex": 475,
    "validatorsLen": 4,
    "authorityIndex": 2
  },
  "signature": "0x7c77e40b2186560a9b3e333dca63f847c624605b706864ff8634b5a33774177d46483c297c941c17dea74f7b2d1919edaebaff02191c5d5dac7f2d6520e3708a"
}