{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x74eba54cbd84f0d8c0f7d407b0f4703b0eb5f0468d33e0c40c3e7f56e53e5014",
    "signature": "0x8e97845588e1b8de6d36a5a45b706cff216289575fa9192d54ea4a470e559c225b2ad73b1420970f7b728139db7ed4f1c6da81d8252d273504d6d4c635b62e8e1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}