<p><b>@ManfredKarrer</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/2768#discussion_r279168005">core/src/main/java/bisq/core/account/sign/SignedWitnessService.java</a>:</p>
<pre style='color:#555'>> +    public Set<SignedWitness> getTrustedPeerSignedWitnessSet(AccountAgeWitness accountAgeWitness) {
+        return signedWitnessMap.values().stream()
+                .filter(e -> !e.isSignedByArbitrator())
+                .filter(e -> Arrays.equals(e.getWitnessHash(), accountAgeWitness.getHash()))
+                .collect(Collectors.toSet());
+    }
+
+    // We go one level up by using the signer Key to lookup for SignedWitness objects which contain the signerKey as
+    // witnessOwnerPubKey
+    public Set<SignedWitness> getSignedWitnessSetBySignerPubKey(byte[] signerPubKey) {
+        return signedWitnessMap.values().stream()
+                .filter(e -> Arrays.equals(e.getWitnessOwnerPubKey(), signerPubKey))
+                .collect(Collectors.toSet());
+    }
+
+    public boolean isValidAccountAgeWitness(AccountAgeWitness accountAgeWitness) {
</pre>
<p>I think we need to pass through the list and remove items once processed.</p>

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