[bisq-network/bisq] Provide ASIC resistant PoW scheme for BSQ swaps (PR #5858)

[chimp1984]

@chimp1984 commented on this pull request.



> +        return CompletableFuture.supplyAsync(() -> {
+            long ts = System.currentTimeMillis();
+            byte[] solution = new Equihash(90, 5, difficulty).puzzle(challenge).findSolution().serialize();
+            long counter = Longs.fromByteArray(Arrays.copyOf(solution, 8));
+            var proofOfWork = new ProofOfWork(solution, counter, challenge, log2Difficulty,
+                    System.currentTimeMillis() - ts, getVersion());
+            log.info("Completed minting proofOfWork: {}", proofOfWork);
+            return proofOfWork;
+        });
+    }
+
+    @Override
+    public byte[] getChallenge(String itemId, String ownerId) {
+        checkArgument(!StringUtils.contains(itemId, '\0'));
+        checkArgument(!StringUtils.contains(ownerId, '\0'));
+        return Hash.getSha256Hash(checkNotNull(itemId) + "\0" + checkNotNull(ownerId));

Ah ok.

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