{
  "manageEntity": {
    "action": "Save",
    "entityId": "647847354",
    "entityType": "Track",
    "nonce": "0x3f9eb18a0b046bcb03f441a4073f4091dd72dc5a44cc099df61a305b93693313",
    "signature": "0x80cd1adefad3f6605ebf779ab4a531b0aabba74428894f9f07dcb499a2b5dc3d7020b99b3c625f1ee4d837f4b51e39b9d08019b1ae6aa9635ebc956089ebaa1c1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}