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diff --git a/src/main/kotlin/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.kt b/src/main/kotlin/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.kt
new file mode 100644
index 0000000..cb7d0bd
--- /dev/null
+++ b/src/main/kotlin/net/pterodactylus/sone/freenet/wot/IdentityManagerImpl.kt
@@ -0,0 +1,91 @@
+/*
+ * Sone - IdentityManagerImpl.java - Copyright © 2010–2019 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.freenet.wot
+
+import com.google.common.eventbus.*
+import com.google.inject.*
+import net.pterodactylus.util.service.*
+import java.util.concurrent.TimeUnit.*
+import java.util.logging.*
+import java.util.logging.Logger.*
+
+/**
+ * The identity manager takes care of loading and storing identities, their
+ * contexts, and properties. It does so in a way that does not expose errors via
+ * exceptions but it only logs them and tries to return sensible defaults.
+ *
+ *
+ * It is also responsible for polling identities from the Web of Trust plugin
+ * and sending events to the [EventBus] when [Identity]s and
+ * [OwnIdentity]s are discovered or disappearing.
+ */
+@Singleton
+class IdentityManagerImpl @Inject constructor(
+		private val eventBus: EventBus,
+		private val webOfTrustConnector: WebOfTrustConnector,
+		private val identityLoader: IdentityLoader
+) : AbstractService("Sone Identity Manager", false), IdentityManager {
+
+	private val currentOwnIdentities = mutableSetOf<OwnIdentity>()
+
+	override val isConnected: Boolean
+		get() = notThrowing { webOfTrustConnector.ping() }
+
+	override val allOwnIdentities: Set<OwnIdentity>
+		get() = synchronized(currentOwnIdentities) {
+			currentOwnIdentities.toSet()
+		}
+
+	override fun serviceRun() {
+		var oldIdentities = mapOf<OwnIdentity, Collection<Identity>>()
+
+		while (!shouldStop()) {
+			try {
+				val currentIdentities = identityLoader.loadIdentities()
+
+				val identityChangeEventSender = IdentityChangeEventSender(eventBus, oldIdentities)
+				identityChangeEventSender.detectChanges(currentIdentities)
+
+				oldIdentities = currentIdentities
+
+				synchronized(currentOwnIdentities) {
+					currentOwnIdentities.clear()
+					currentOwnIdentities.addAll(currentIdentities.keys)
+				}
+			} catch (wote1: WebOfTrustException) {
+				logger.log(Level.WARNING, "WoT has disappeared!", wote1)
+			} catch (e: Exception) {
+				logger.log(Level.SEVERE, "Uncaught exception in IdentityManager thread!", e)
+			}
+
+			/* wait a minute before checking again. */
+			sleep(SECONDS.toMillis(60))
+		}
+	}
+
+}
+
+private val logger: Logger = getLogger(IdentityManagerImpl::class.java.name)
+
+private fun notThrowing(action: () -> Unit): Boolean =
+		try {
+			action()
+			true
+		} catch (e: Exception) {
+			false
+		}