{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x400a405e105e84d2d6242f0be7a0921cafb52660fb2028d0f9acfe0c459169b0",
    "signature": "0x368c10432beafc40433913793f31abcf18df25ffb60fd509938905338d2a452415f9ae097bcbc366173811aab050ab23a4d4ad80a05aea61d857e7c84864149c1b",
    "signer": "0x3A5d9303814AC95Becf9EB5a6c572608f82b3804",
    "userId": "12639568"
  }
}