{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x126b1d6910ec928d09ab9787fe71550af7460744c0a6d4f8c4dbbfbc64e3a1aa",
    "signature": "0x768eaa5ba05bcde972cefe4b0a8d6700e24c522dd24e5373565441e288d05c6d24b55b2efe4a93d26ea9016b4ffb15fd5365f665ec9e3e0883f437137e6c9af71b",
    "signer": "0xfffF643204D053ae5bFC296Aa20F15313084C719",
    "userId": "473911971"
  }
}