{
  "manageEntity": {
    "action": "Save",
    "entityId": "489516877",
    "entityType": "Track",
    "nonce": "0x6e74a1561d847d58ba8e87c9f390d1c2a9346f50a037ba4b89be674338b5e7d2",
    "signature": "0x514da9614a866b1c5f48a1cd440e619b06e18171d53d47c5a789d278f3d28ae5318691d212d603c45b2260b34e3dd3ca624e393b9ab168d25fd3aa8788c8f4a21b",
    "signer": "0x55B320FE4ae0dC96fE927A1d4fA23b18d1874EF1",
    "userId": "562822143"
  }
}