{
  "manageEntity": {
    "action": "Save",
    "entityId": "1308502669",
    "entityType": "Track",
    "nonce": "0xd4be598386cbc3d2ae4ca72d32fd8c24506a52f59ef22eaabb0a5f54ac39b95c",
    "signature": "0xe458d3faeeef1b67d0c3bec6b9423c055df377544a3b37a01efd0a2d6a253620688a0f67f11f4c09fc0eb1ab5661950e2d89fa8f0188d8fcabd6078357c8a3f51b",
    "signer": "0x4A3D09CdfD42dE4C57dc67B09a40B5d9172bD69f",
    "userId": "787102835"
  }
}