{
  "manageEntity": {
    "action": "Save",
    "entityId": "449657",
    "entityType": "Track",
    "nonce": "0xe492ac379c63ea105595dc6223b49b1ae5d4002da410f8f7e90cd9f4aa2d5807",
    "signature": "0x7bde5136706ba4753f1714e8336eff8d2bb8dcb0b823bec2ab779ab1177b6b861a9ce94c2eaee847684379e7d9c9a4837dbd86010792f07401f79ef696fdd7111b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}