{
  "manageEntity": {
    "action": "Save",
    "entityId": "215077745",
    "entityType": "Track",
    "nonce": "0xe7c6f1cfdb900ffefdb90c5e5496a7bb494b63ffccc9ffb9075cc8a8487d6653",
    "signature": "0x9e9f2856a7c7903445aa3197c99c921744bb150c10bb26db69407ddcc45c36691c4bd4ad0ad5c4b77ded46abcce08f9e9b852583d6ab78f5de0454a8e2185e2a1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}