{
  "manageEntity": {
    "action": "Save",
    "entityId": "600660163",
    "entityType": "Track",
    "nonce": "0x33ae7ba43519448fbae7e06068edd397ad44dc335bcbbccecca208e12b722100",
    "signature": "0x4a2ed756ba40ab44dbd210f99c4defeea1dfaf2c157794668bddbad73946202e6f55fda7370192fc4f538d8211ae61e6d713aa90edf903bd4af92cac7c72c9f91b",
    "signer": "0x12cc71bF02E05d24430Ac01F30544a50C5BDb063",
    "userId": "55609"
  }
}