{
  "manageEntity": {
    "action": "Create",
    "entityId": "747848653",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"thank you for remixing Lucky \u003c3\",\"entity_id\":975481062,\"track_timestamp_s\":213}}",
    "nonce": "0xc38205ae8c726b6c1fbc5cca4b0fab85d8859ac544b793521e3d6d13e1564ada",
    "signature": "0xf4f5d71913a65b592479aa063c1443fe48bd022884abed23de25303337617d1240117c42f9af83800bc17a5fbe7a80993c31485007fa78ea38b61a6f8baae2411b",
    "signer": "0xD275B3e48396dC15C3Eb4440DDB1680F10Fc595E",
    "userId": "109089"
  }
}