{
  "manageEntity": {
    "action": "Save",
    "entityId": "243509182",
    "entityType": "Track",
    "nonce": "0xc9cf87eb073688786b9d9201c50f4eb75267a909884d91be06741d17ce342e28",
    "signature": "0xc00bae0490c985b99d5872738d7b0bf192b2ee3ba3f0d2b2be8210fb2955b60174054a1955d48676bb8ff1b0d0dc08b6dca001fdd575f7d254cbce4cebe60eb11b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}