{
  "manageEntity": {
    "action": "Save",
    "entityId": "501723",
    "entityType": "Track",
    "nonce": "0x272c1dbea7c22ed2e83091862a8bd7d621bb6ce9cf6f00b7d2e664af780b6c98",
    "signature": "0x7ba44863bc522d1e87c3c583a51a8dad9b77d874a4bd3daeb94fd8b3b64c615f4ee307e647d173ab02646f49e429888d718cbdef7f9f8068eba558db89446d721c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}