{
  "manageEntity": {
    "action": "Save",
    "entityId": "386451",
    "entityType": "Track",
    "nonce": "0x5cffd5eb2d8aa2dbe8f36534c285990177b56a959f23e0df017746490b2901d0",
    "signature": "0xaeec7aaacd0c75066ce4fec60a355b61961b8273de19525782ef2cc5bddd84f17cbf3629607291b3da5a00200ce7c1a3de7eb0ee94919c53aa86a894e1f348bb1c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}