{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb4e0a47549d9396cbaaba8dfb5b9cb747e824f6ef542e5d96d14eab2e2f76a10",
    "signature": "0xddeb14d4a194df8d992a14ec9bc073158a3255f987a4c0ba659a727032ac56da50b04ff9a256361ec8e198f6e98137cb3f137c26839e0864f31def349caac0c91c",
    "signer": "0xB40D00E36403aF3B4bdb29a43BEaE33057EE4129",
    "userId": "500138887"
  }
}