Extrinsic 28481-1

{
  "heartbeat": {
    "blockNumber": 28480,
    "sessionIndex": 474,
    "validatorsLen": 1,
    "authorityIndex": 0
  },
  "signature": "0x164b641c20787322ef83edebacecb94a2ab013e1230445f72106b5f6d60b7309ab1feb28da4e98555f977efb253e17444e90cb95a9e83998c2207ba4fcb0588b"
}