{
  "manageEntity": {
    "action": "Save",
    "entityId": "1544699379",
    "entityType": "Track",
    "nonce": "0xabf7d4c9bb9dc6a912c5688c6c92b3f146dbfa91996e918cc7e337467fba902b",
    "signature": "0x891263348f9a853fdad3123911fa4b82951d8a70e7ea625efef82c3e7114698f293bb4f77edc599f310391957220a09c6f7796437d3ca75c8133e55ffccab3481c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}