{
  "manageEntity": {
    "action": "Save",
    "entityId": "254497",
    "entityType": "Track",
    "nonce": "0x535403aa4bbb0df4cf579c8f9d43985befb5d8f12136e7590d9f5a30a8062785",
    "signature": "0x64faada0e6b94aa8f6ca5f7745a2120997877a434069b262f3a976d5d9af51b5591c1d690881246cde296e8059621dc460ffa52ca8e1e617004d9de2dcf274b11b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}