{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xc19677d504a7116c730e05eb5ff600e7b1c7d1f3a8fdbc5e55152a314a79c492",
    "signature": "0x305c660ee83d811cb569c27ebd94c214a7a80fa0cc76cfc4714efe601e7c619c2c34db809beac1d46c96a9a6ae69f41ef2621ad3be7714ec294be69978dd6ba81b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}