diff --git a/client/src/App.css b/client/src/App.css
index cc57c54..c85b7af 100644
--- a/client/src/App.css
+++ b/client/src/App.css
@@ -3046,10 +3046,14 @@ html.theme-cupertino .events-scroll-container {
 
 .app-version-footer__copyright {
   color: #94a3b8;
+}
+
+.app-version-footer__copyright a {
+  color: inherit;
   text-decoration: none;
 }
 
-.app-version-footer__copyright:hover {
+.app-version-footer__copyright a:hover {
   color: #e2e8f0;
   text-decoration: underline;
 }
diff --git a/client/src/components/AppFooter.tsx b/client/src/components/AppFooter.tsx
index 456b2a0..437b2c0 100644
--- a/client/src/components/AppFooter.tsx
+++ b/client/src/components/AppFooter.tsx
@@ -7,9 +7,10 @@ export default function AppFooter() {
       <span className="app-version-footer__sep" aria-hidden="true">
         ·
       </span>
-      <a className="app-version-footer__copyright" href="mailto:elpatron+kd@mailbox.org">
-        © 2026 Markus F.J. Busche
-      </a>
+      <span className="app-version-footer__copyright">
+        © 2026 KnorrLabs/
+        <a href="mailto:elpatron+kd@mailbox.org">Markus F.J. Busche</a>
+      </span>
     </footer>
   )
 }
diff --git a/client/src/components/LogEntryEditor.tsx b/client/src/components/LogEntryEditor.tsx
index afefe39..9ae861e 100644
--- a/client/src/components/LogEntryEditor.tsx
+++ b/client/src/components/LogEntryEditor.tsx
@@ -13,7 +13,8 @@ import TrackMap from './TrackMap.tsx'
 import { useDialog } from './ModalDialog.tsx'
 import {
   normalizeSignature,
-  serializeSignature,
+  fingerprintSignature,
+  normalizedSerializedSignature,
   isPasskeySignature,
   isSignatureValidForEntry,
   hasAnySignature
@@ -79,8 +80,8 @@ function fingerprintFromStoredEntry(decrypted: Record<string, unknown>): string
 
   return JSON.stringify({
     ...payload,
-    signSkipper: serializeSignature(normalizeSignature(decrypted.signSkipper as SignatureValue | '') || '') ?? '',
-    signCrew: serializeSignature(normalizeSignature(decrypted.signCrew as SignatureValue | '') || '') ?? ''
+    signSkipper: fingerprintSignature(decrypted.signSkipper),
+    signCrew: fingerprintSignature(decrypted.signCrew)
   })
 }
 
@@ -241,8 +242,8 @@ export default function LogEntryEditor({
     const payload = buildPayloadForSigning()
     return JSON.stringify({
       ...payload,
-      signSkipper: serializeSignature(signSkipper) ?? '',
-      signCrew: serializeSignature(signCrew) ?? ''
+      signSkipper: fingerprintSignature(signSkipper),
+      signCrew: fingerprintSignature(signCrew)
     })
   }, [buildPayloadForSigning, signSkipper, signCrew])
 
@@ -256,8 +257,8 @@ export default function LogEntryEditor({
 
     const entryData = {
       ...buildPayloadForSigning(eventsOverride),
-      signSkipper: serializeSignature(signSkipper),
-      signCrew: serializeSignature(signCrew)
+      signSkipper: normalizedSerializedSignature(signSkipper),
+      signCrew: normalizedSerializedSignature(signCrew)
     }
 
     const encrypted = await encryptJson(entryData, masterKey)
@@ -285,8 +286,8 @@ export default function LogEntryEditor({
 
     setSavedFingerprint(JSON.stringify({
       ...buildPayloadForSigning(eventsOverride),
-      signSkipper: serializeSignature(signSkipper) ?? '',
-      signCrew: serializeSignature(signCrew) ?? ''
+      signSkipper: fingerprintSignature(signSkipper),
+      signCrew: fingerprintSignature(signCrew)
     }))
   }, [
     readOnly, logbookId, entryId, events, buildPayloadForSigning, signSkipper, signCrew
diff --git a/client/src/utils/signatures.ts b/client/src/utils/signatures.ts
index 339abe3..fd8b7f8 100644
--- a/client/src/utils/signatures.ts
+++ b/client/src/utils/signatures.ts
@@ -68,3 +68,12 @@ export function serializeSignature(value: SignatureValue | '' | undefined): Sign
   const trimmed = value.trim()
   return trimmed || undefined
 }
+
+/** Normalize then serialize — canonical form for persistence and dirty-check fingerprints. */
+export function normalizedSerializedSignature(value: unknown): SignatureValue | undefined {
+  return serializeSignature(normalizeSignature(value) || '')
+}
+
+export function fingerprintSignature(value: unknown): string {
+  return normalizedSerializedSignature(value) ?? ''
+}