{
  "manageEntity": {
    "action": "Save",
    "entityId": "954470",
    "entityType": "Track",
    "nonce": "0xc592d0ae0a8812bbbdf5c533bc2b7b34d0f34ecfebe104c479f712a7dcec478b",
    "signature": "0xbf1a7c761912e8d03e24e1fd8649d3df75d0d6116fe9cbaef637de69be6a87b121188fa80b1ce5868c70e0e4526b8d302de05b5b49e511571bcadc3addbe156f1b",
    "signer": "0x45C74e4f36E4e5064C5321eeED3748fD52B04eA8",
    "userId": "133970929"
  }
}