{
  "manageEntity": {
    "action": "Save",
    "entityId": "619978042",
    "entityType": "Track",
    "nonce": "0x0caca7debd5556f4aedd228374cf590d0569d2420ea00d0685a4adc94a6a46ed",
    "signature": "0xc47cb360266e4fb5b91f2eeb5d95a4fc5d68392f8f3a7fa119edcff4bc946d31750ef40e769698e370d07187f9e7e6ebb82a4e0402839d1c7d4bb190ef0ce30e1c",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}