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

<hr>

<p>In <a href="https://github.com/bisq-network/bisq/pull/3121#discussion_r316274054">core/src/main/java/bisq/core/account/sign/SignedWitnessService.java</a>:</p>
<pre style='color:#555'>> +    }
+
+    // Arbitrator signing
+    public List<BuyerDataItem> getBuyerPaymentAccounts(long safeDate) {
+        return disputeManager.getDisputesAsObservableList().stream()
+                .filter(this::hasChargebackRisk)
+                .filter(this::isBuyerWinner)
+                .map(this::getBuyerData)
+                .filter(Objects::nonNull)
+                .filter(buyerDataItem -> buyerDataItem.getAccountAgeWitness().getDate() < safeDate)
+                .distinct()
+                .collect(Collectors.toList());
+    }
+
+    private boolean hasChargebackRisk(Dispute dispute) {
+        return PaymentMethod.hasChargebackRisk(dispute.getContract().getPaymentMethodId());
</pre>
<p>we should stop calling static util methods. Maybe we can move some methods from PaymentMethod to a class that we can inject.</p>

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