Thanks for the invitation jgart! I've added the MediaGoblin channel below.

---
 channels.scm | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/channels.scm b/channels.scm
index 5ec32e7..acfa763 100644
--- a/channels.scm
+++ b/channels.scm
@@ -532,6 +532,17 @@
     (channel
      (name 'thgsc)
      (url "https://codeberg.org/tusharhero/thgsc"))))
+  (toys-box
+   (forge "mediagoblin")
+   (channel
+    (channel
+     (name 'mediagoblin)
+     (url "https://git.sr.ht/~mediagoblin/mediagoblin")
+     (introduction
+      (make-channel-introduction
+       "d4b2f5b67c6862346e0f91b5e964d5b07878046d"
+       (openpgp-fingerprint
+        "3E7F36E73BDD6A7106F92021023C05E2C9C068F0"))))))
   (toys-box
    (forge "cgit")
    (channel %default-guix-channel)))
-- 
2.45.1

Thanks! Applied