{
  "manageEntity": {
    "action": "Save",
    "entityId": "1323896748",
    "entityType": "Track",
    "nonce": "0x0dbeba65a4d77188e9f3ff3b992388289d98aae1811c7cdd9343838e62c4960b",
    "signature": "0x692059868eb5c716baa30880bdf435a956d39cedd47dfa4b730841066d15c3a55836f585f39238244996fb03db45a6c38aa3d2173a2c0c08cfed623f8477fbbe1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}