{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8d61f27dc2f12848dd4541ba8b5af00434e320d1083d244db1c63ddc1c926bf3",
    "signature": "0x197ecb9e0366f583f3c61a25e2ce9618642b67e41fec617b1dfc213e83b434f74790e1a6b963f58b7890bf953ad9ddf001ce286f1843530e77f0a539853c41cf1c",
    "signer": "0x268277a197a3A619749b1997ab92bb2475B0978C",
    "userId": "19571191"
  }
}