{
  "manageEntity": {
    "action": "Save",
    "entityId": "561640",
    "entityType": "Track",
    "nonce": "0xafc66f16b92d3ebd6ed92484e86b59f42cd714a839e026f8302c0f77675034a8",
    "signature": "0xf564e0bb6c95515604c2c6c9726e33199ea047043b48de59062036d90dd5b903455f4c3593d7af8c3c3fa93a4a40749e3990932907ebbcc6266d6b87f09202831b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}