Extrinsic 16877-1

{
  "heartbeat": {
    "blockNumber": 16875,
    "sessionIndex": 281,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x3019ccb0d9440ed72aa230070737c2e404ec8e55f61e9059db989608b7c7ed43d5ea40d480ecef5ea992db36e518bfa47b472f9090bbabb6135b7f320844d588"
}