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diff --git a/org.argeo.api.uuid/src/org/argeo/api/uuid/ConcurrentUuidFactory.java b/org.argeo.api.uuid/src/org/argeo/api/uuid/ConcurrentUuidFactory.java
new file mode 100644
index 000000000..05b2f05c6
--- /dev/null
+++ b/org.argeo.api.uuid/src/org/argeo/api/uuid/ConcurrentUuidFactory.java
@@ -0,0 +1,64 @@
+package org.argeo.api.uuid;
+
+import static java.lang.System.Logger.Level.DEBUG;
+import static java.lang.System.Logger.Level.WARNING;
+
+import java.lang.System.Logger;
+import java.security.DrbgParameters;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+import java.util.Objects;
+
+/**
+ * A configurable implementation of an {@link AsyncUuidFactory}, which can be
+ * used as a base class for more optimised implementations.
+ * 
+ * @see https://datatracker.ietf.org/doc/html/rfc4122
+ */
+public class ConcurrentUuidFactory extends AbstractAsyncUuidFactory {
+	private final static Logger logger = System.getLogger(ConcurrentUuidFactory.class.getName());
+
+//	private byte[] defaultNodeId;
+
+	private Long nodeIdBase;
+
+	public ConcurrentUuidFactory(byte[] nodeId, int offset) {
+		Objects.requireNonNull(nodeId);
+		if (offset + 6 > nodeId.length)
+			throw new IllegalArgumentException("Offset too big: " + offset);
+		byte[] defaultNodeId = toNodeIdBytes(nodeId, offset);
+		nodeIdBase = NodeIdSupplier.toNodeIdBase(defaultNodeId);
+		setNodeIdSupplier(() -> nodeIdBase);
+	}
+
+	protected ConcurrentUuidFactory() {
+
+	}
+
+	@Override
+	protected SecureRandom newSecureRandom() {
+		SecureRandom secureRandom;
+		try {
+			secureRandom = SecureRandom.getInstance("DRBG",
+					DrbgParameters.instantiation(256, DrbgParameters.Capability.PR_AND_RESEED, "UUID".getBytes()));
+		} catch (NoSuchAlgorithmException e) {
+			try {
+				logger.log(DEBUG, "DRBG secure random not found, using strong");
+				secureRandom = SecureRandom.getInstanceStrong();
+			} catch (NoSuchAlgorithmException e1) {
+				logger.log(WARNING, "No strong secure random was found, using default");
+				secureRandom = new SecureRandom();
+			}
+		}
+		return secureRandom;
+	}
+
+	/*
+	 * TIME-BASED (version 1)
+	 */
+//
+//	@Override
+//	public UUID newTimeUUID() {
+//		return newTimeUUID(timeUuidState.useTimestamp(), timeUuidState.getClockSequence(), defaultNodeId, 0);
+//	}
+}