{
  "manageEntity": {
    "action": "Save",
    "entityId": "1479185669",
    "entityType": "Track",
    "nonce": "0x601338b87a1d28aaa8d07e551bf38ae4f96437f82c243b356a073acd1aeb5f6d",
    "signature": "0x26d8c38c35dca2bd7ea01b4d06a1d16c52ca08ae8a1f35089d63240dd6b5f8de4782377b71505f3b8c7703ea36b732018cd2d243bb50121f6adb8d96d0aa4b0d1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}