{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xffc6eea8d687f4fe195c1cd24e029390c54f9e2e4cecafe161bc837e8bfd09f5",
    "signature": "0x09b5e5e547cd77ef1182715daf85b80721f47113075c959274582a75962d929e146b59f61194251e2d0466024331a6140caec7fefd7acccc4152270a2de687781b",
    "signer": "0x0880BCB74D5456f4a1f957C6a1cd3617009BBbDA",
    "userId": "579497175"
  }
}