{
  "manageEntity": {
    "action": "Save",
    "entityId": "449928615",
    "entityType": "Track",
    "nonce": "0x6d780499116c87fcf56e120fa69cc16c0c91ca978bb60a10660d1cb713061933",
    "signature": "0x59dd3ac1347c2b48db313564bd130035fb1f91f27a5c14b0e87287980e46d2c25eccb285d02aafc89c270516da713db4ae3f539c60755914bf1d7af3feaa319e1c",
    "signer": "0x2ACda02e37Db2DC08f82aEFAB268F0610974bb3c",
    "userId": "416239376"
  }
}