{
  "manageEntity": {
    "action": "Save",
    "entityId": "891649825",
    "entityType": "Track",
    "nonce": "0x666c2e0dd65b8b9ef98379ffa95ff167c60188c8c9b759b603e5acbd2b4c1905",
    "signature": "0xc7cf225db39d04c2cea337528cafb82feb362cba9f8fad8740405716609725b6634fa4b0068439a835030d10c613f71313d5f123e92ed36902e60b27217428f51b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}