{
  "manageEntity": {
    "action": "Save",
    "entityId": "1589833289",
    "entityType": "Track",
    "nonce": "0xfd5dd18e0c8e8a253e1a3007df09e65df4388de8450047a36997756c4fe8a730",
    "signature": "0x2e7c8342109377fa7a1a993449f1261115e6fc6740b9541e18dd9f3ab456358a04f82e101de4423087339b106efe8ac036757e6afdba8ba6a511688efa061a5f1b",
    "signer": "0x7b52e6AA15Db4Fc3A84AFF2b12e5B8B128eA8610",
    "userId": "808512351"
  }
}