diff --git a/spec/22/photos/speakers/petr-sanetrnik-twitter.jpg b/spec/22/photos/speakers/petr-sanetrnik-twitter.jpg
new file mode 100644
index 0000000..183cb8a
Binary files /dev/null and b/spec/22/photos/speakers/petr-sanetrnik-twitter.jpg differ
diff --git a/spec/22/speakers.yaml b/spec/22/speakers.yaml
index 2281743..5a3e518 100644
--- a/spec/22/speakers.yaml
+++ b/spec/22/speakers.yaml
@@ -401,3 +401,11 @@
   tracks: [ eth, nft ]
   country: cz
 
+- id: petr-sanetrnik
+  name: Petr Sanetrník
+  twitter: PetrSanetrnik
+  orgs: |
+    [CryptViz](https://crypviz.io/)
+  tracks: [ eth, defi, nft ]
+  country: cz
+