{
  "manageEntity": {
    "action": "Save",
    "entityId": "669840",
    "entityType": "Track",
    "nonce": "0xc627f919c2c1e8cc1e3945fad0e519b1824ae03788f9891cb19d26b2fdcd8db7",
    "signature": "0xeed48bec03b0085e2ca67229c6accc203785419901541905204a67bd628d248a645927974d264d0a6d1419c5c68b1584e7aefcc366dab718d9ebf0d8716582ec1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}