Extrinsic 16907-1

{
  "heartbeat": {
    "blockNumber": 16906,
    "sessionIndex": 281,
    "validatorsLen": 4,
    "authorityIndex": 0
  },
  "signature": "0x381478641b912d8bcd79a4cfa2ce09d48990108df10c9dd7510b8de858298371b7cecadfdb125450920c05a4deec492c2232459f349939d3dd6f76a8ca59488e"
}