{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xbe661d2e69bc5a8ca100be5297caef974282ab933202e6cbed21df636039c88b",
    "signature": "0x5cc2b1d664d8657610986e86242e4a2ed07d499bb9aab3115374688f882566272e7cd9f37b5ff3425d0b72ecddfcc9d4e93a0821a304a149b3a6f311b13954db1b",
    "signer": "0x74Cfba397474D1C8E5568957E9684113ad5A2Bd8",
    "userId": "576874887"
  }
}