Extrinsic 16544-1

{
  "heartbeat": {
    "blockNumber": 16543,
    "sessionIndex": 275,
    "validatorsLen": 4,
    "authorityIndex": 3
  },
  "signature": "0x22fea99d164af0cd981ada2ad2c1728d33a581b00db1dda20ca2cb38f0c50d1f9566ee55e2f7123639624212b0063c18d529e3c5bae17b56006224d981865d87"
}