{
  "manageEntity": {
    "action": "Save",
    "entityId": "449792296",
    "entityType": "Track",
    "nonce": "0x8dfcea7c56448ebe907a4fffb89ba6590e85d96017a9e2e111e2fd8a051727fe",
    "signature": "0xaa26cd42b727a677b98c9abe8228a33acf5e09bb19e094dbe57977b72491eb116f624259f4168b5897bbd8c4d98e5bf4b311500784e8acbeba8ceb0550dbbb841b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}