{
  "manageEntity": {
    "action": "Save",
    "entityId": "1500190172",
    "entityType": "Track",
    "nonce": "0x41855a73a48c8bec1ca43002d42f65b66af0bedd400d9521c6ec307c24f23ca9",
    "signature": "0x3ab7f39689921dd5aaa5867999e3ba07c5db9a198b1e913dc3c62e07862409f5204069219d3ea8390bb53840d346a5e4abb1d5c3c23e0d451dd772aa97104a8b1b",
    "signer": "0xDfAC0702040EaBd2d42e773014D4b014C0747D9c",
    "userId": "707937"
  }
}