{
  "manageEntity": {
    "action": "Save",
    "entityId": "125499098",
    "entityType": "Track",
    "nonce": "0x4c7455d077353b16120ed053c401e80ecf00e1c862c06e93c1514e3d66d8aae3",
    "signature": "0x9e15cf4f3535fd23ca31372e4e4ec798f51d6bdf8c19d05758868a6fa62aa47a032783cba9bbde871ae770f2d00b21c90cd5d8b7a600c2c77cd3b8b8e2aa33a71c",
    "signer": "0x6AAB6EaEa3f7F15750b649C269b0391dcB19dEeb",
    "userId": "92019297"
  }
}