diff --git a/src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt b/src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt
index 217bbcb0..5af3a74e 100644
--- a/src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt
+++ b/src/main/kotlin/io/emeraldpay/dshackle/upstream/Multistream.kt
@@ -333,7 +333,8 @@ abstract class Multistream(
             .filter { it.getStatus() != UpstreamAvailability.OK }
             .joinToString(", ") { it.getId() }
 
-        log.info("State of ${chain.chainCode}: height=${height ?: '?'}, status=[$statuses], lag=[$lag], weak=[$weak]")
+        val instance = System.identityHashCode(this).toString(16)
+        log.info("State of ${chain.chainCode}: height=${height ?: '?'}, status=[$statuses], lag=[$lag], weak=[$weak] ($instance)")
     }
 
     fun test(event: UpstreamChangeEvent): Boolean {