{
  "manageEntity": {
    "action": "Save",
    "entityId": "968991257",
    "entityType": "Track",
    "nonce": "0xaf583e847ba932ebfe306052e0c6854b379d73759e70c561cfe0130b54285d63",
    "signature": "0x3337f871f6c87032e98d8cc53a0948fccba4436c3cd5cf27e1b89496e4f3c2b30809fbf377933056a4dd6af90ca727fc0212516419d2b388f1abbe87a9e316b01c",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}