{
  "manageEntity": {
    "action": "Save",
    "entityId": "657480392",
    "entityType": "Track",
    "nonce": "0x23ee6688961211b74f79867ebbb1ac39be55a5c263bade6ebb6cc7d1ebfd34fc",
    "signature": "0xbb9ce9be29b44c50e0625dd3a18fa0f4f40873500c0d8a61a570b3e8a9ee49de21a90dde7cb16a3f26360bc6c14a254baf580afc349a9b054a4d3d6357b148a81c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}