{
  "manageEntity": {
    "action": "Save",
    "entityId": "1603636487",
    "entityType": "Track",
    "nonce": "0x7999a272ee332c347111579ea5caf071db77745bd93aa30e252719ea4b43418b",
    "signature": "0x1c75878f418774032a8a21e2946c929848657e0abc202abf61cd1ba13e554c455ffccba2c5b3ba40ace570b2b45390c17e3975b1b4098ebce34d7dbc9ef281931b",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}