{
  "manageEntity": {
    "action": "Save",
    "entityId": "1423941496",
    "entityType": "Track",
    "nonce": "0x5993e588a46ba7785997205701d5c7cd146816fa55fa6d5b1a5565f844f7de7b",
    "signature": "0x6174dfd3cfe1a11639ec7fd8b34bdcc415f4cbb93b6e1244fc7a77e60e7dc3d23be0748601cebfd60647da3f5d9aa83d72ab3bce65f5c2725d055d4554ce9dad1c",
    "signer": "0xD07A680d4F48bA7Cc076c23f40870AccBbad1987",
    "userId": "16411799"
  }
}