Extrinsic 28710-1

{
  "heartbeat": {
    "blockNumber": 28709,
    "sessionIndex": 478,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0xc8e995f5f25a82de29bdfd89cfc9a09eadcc6d6e37b32f462ecaf0eec14e5448552da6898a6ad0f240130a91a8b186004c7b4dc3975fdb99f0400976fecc4888"
}