diff --git a/khatru/blossom/eventstorewrapper.go b/khatru/blossom/eventstorewrapper.go
index 5cfde0b..72a2836 100644
--- a/khatru/blossom/eventstorewrapper.go
+++ b/khatru/blossom/eventstorewrapper.go
@@ -7,6 +7,7 @@ import (
 
 	"fiatjaf.com/nostr"
 	"fiatjaf.com/nostr/eventstore"
+	"fiatjaf.com/nostr/nipb0/blossom"
 )
 
 // EventStoreBlobIndexWrapper uses fake events to keep track of what blobs we have stored and who owns them
@@ -89,7 +90,7 @@ func (es EventStoreBlobIndexWrapper) Delete(ctx context.Context, sha256 string,
 func (es EventStoreBlobIndexWrapper) parseEvent(evt nostr.Event) BlobDescriptor {
 	hhash := evt.Tags[0][1]
 	mimetype := evt.Tags[1][1]
-	ext := getExtension(mimetype)
+	ext := blossom.GetExtension(mimetype)
 	size, _ := strconv.Atoi(evt.Tags[2][1])
 
 	return BlobDescriptor{
diff --git a/khatru/blossom/handlers.go b/khatru/blossom/handlers.go
index 0784c37..8ec0b8c 100644
--- a/khatru/blossom/handlers.go
+++ b/khatru/blossom/handlers.go
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"fiatjaf.com/nostr"
+	"fiatjaf.com/nostr/nipb0/blossom"
 	"github.com/liamg/magic"
 )
 
@@ -87,11 +88,11 @@ func (bs BlossomServer) handleUpload(w http.ResponseWriter, r *http.Request) {
 	} else {
 		// if we can't find, use the filetype given by the upload header
 		mimetype := r.Header.Get("Content-Type")
-		ext = getExtension(mimetype)
+		ext = blossom.GetExtension(mimetype)
 	}
 
 	// special case of android apk -- if we see a .zip but they say it's .apk we trust them
-	if ext == ".zip" && getExtension(r.Header.Get("Content-Type")) == ".apk" {
+	if ext == ".zip" && blossom.GetExtension(r.Header.Get("Content-Type")) == ".apk" {
 		ext = ".apk"
 	}
 
@@ -197,7 +198,7 @@ func (bs BlossomServer) handleGetBlob(w http.ResponseWriter, r *http.Request) {
 			ext = spl[1]
 		}
 	} else if bd != nil {
-		ext = getExtension(bd.Type)
+		ext = blossom.GetExtension(bd.Type)
 	}
 
 	if nil != bs.RejectGet {
@@ -345,7 +346,7 @@ func (bs BlossomServer) handleDelete(w http.ResponseWriter, r *http.Request) {
 			ext = spl[1]
 		}
 	} else if bd != nil {
-		ext = getExtension(bd.Type)
+		ext = blossom.GetExtension(bd.Type)
 	}
 
 	// should we accept this delete?
@@ -454,7 +455,7 @@ func (bs BlossomServer) handleMirror(w http.ResponseWriter, r *http.Request) {
 	var ext string
 	contentType := resp.Header.Get("Content-Type")
 	if contentType != "" {
-		ext = getExtension(contentType)
+		ext = blossom.GetExtension(contentType)
 	} else if ft, _ := magic.Lookup(body); ft != nil {
 		ext = "." + ft.Extension
 	} else if idx := strings.LastIndex(req.URL, "."); idx != -1 {
diff --git a/khatru/blossom/utils.go b/khatru/blossom/utils.go
index 6de47b3..a76cc3d 100644
--- a/khatru/blossom/utils.go
+++ b/khatru/blossom/utils.go
@@ -1,7 +1,6 @@
 package blossom
 
 import (
-	"mime"
 	"net/http"
 )
 
@@ -9,31 +8,3 @@ func blossomError(w http.ResponseWriter, msg string, code int) {
 	w.Header().Add("X-Reason", msg)
 	w.WriteHeader(code)
 }
-
-func getExtension(mimetype string) string {
-	if mimetype == "" {
-		return ""
-	}
-
-	switch mimetype {
-	case "image/jpeg":
-		return ".jpg"
-	case "image/gif":
-		return ".gif"
-	case "image/png":
-		return ".png"
-	case "image/webp":
-		return ".webp"
-	case "video/mp4":
-		return ".mp4"
-	case "application/vnd.android.package-archive":
-		return ".apk"
-	}
-
-	exts, _ := mime.ExtensionsByType(mimetype)
-	if len(exts) > 0 {
-		return exts[0]
-	}
-
-	return ""
-}
diff --git a/nipb0/blossom/utils.go b/nipb0/blossom/utils.go
new file mode 100644
index 0000000..800fb88
--- /dev/null
+++ b/nipb0/blossom/utils.go
@@ -0,0 +1,31 @@
+package blossom
+
+import "mime"
+
+func GetExtension(mimetype string) string {
+	if mimetype == "" {
+		return ""
+	}
+
+	switch mimetype {
+	case "image/jpeg":
+		return ".jpg"
+	case "image/gif":
+		return ".gif"
+	case "image/png":
+		return ".png"
+	case "image/webp":
+		return ".webp"
+	case "video/mp4":
+		return ".mp4"
+	case "application/vnd.android.package-archive":
+		return ".apk"
+	}
+
+	exts, _ := mime.ExtensionsByType(mimetype)
+	if len(exts) > 0 {
+		return exts[0]
+	}
+
+	return ""
+}