diff --git a/src/core.json b/src/core.json
index 0fb13da..53465be 100644
--- a/src/core.json
+++ b/src/core.json
@@ -549,7 +549,7 @@
       "caption": "Educator, writer, cryptoanarchist & biohacker ([blog](https://juraj.bednar.io/))",
       "country": "sk",
       "refs": {
-        "twitter": "jurbed"
+        os error 2"twitter": "jurbed"
       },
       "imageUrl": "https://data.web3privacy.info/img/people/juraj-bednar.jpg",
       "thumbs": {
@@ -1621,23 +1621,5 @@
         "square": "https://data.web3privacy.info/img/events/2024/c24bkk-square.png",
         "wide": "https://data.web3privacy.info/img/events/2024/c24bkk-wide.png"
       },
-      "thumbs": {
-        "poster-simple:128": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-simple-128px.webp",
-        "wide:128": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-128px.webp",
-        "wide-square:640": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-square-640px.webp",
-        "wide:360": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-360px.webp",
-        "wide-square:360": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-square-360px.webp",
-        "poster:640": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-640px.webp",
-        "poster-simple:360": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-simple-360px.webp",
-        "square:128": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-square-128px.webp",
-        "square:640": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-square-640px.webp",
-        "poster:128": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-128px.webp",
-        "square:360": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-square-360px.webp",
-        "poster-simple:640": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-simple-640px.webp",
-        "poster:360": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-poster-360px.webp",
-        "wide:640": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-640px.webp",
-        "wide-square:128": "https://data.web3privacy.info/img/events/2024/thumbs/c24bkk-wide-square-128px.webp"
-      }
-    },
   ]
 }