diff --git a/devnet-sdk/testing/testlib/validators/lowlevel.go b/devnet-sdk/testing/testlib/validators/lowlevel.go
index 4a1456e4974..986ae3cd62b 100644
--- a/devnet-sdk/testing/testlib/validators/lowlevel.go
+++ b/devnet-sdk/testing/testlib/validators/lowlevel.go
@@ -54,7 +54,8 @@ func lowLevelSystemValidator(sysMarker interface{}) systest.PreconditionValidato
 }
 
 func AcquireLowLevelSystem() (LowLevelSystemGetter, systest.PreconditionValidator) {
-	sysMarker := &struct{}{}
+	sysMarker := newSentinelMarker()
+	fmt.Printf("low level system: %p\n", sysMarker)
 	validator := lowLevelSystemValidator(sysMarker)
 	return func(ctx context.Context) system.LowLevelSystem {
 		return ctx.Value(sysMarker).(system.LowLevelSystem)
diff --git a/devnet-sdk/testing/testlib/validators/sentinel.go b/devnet-sdk/testing/testlib/validators/sentinel.go
new file mode 100644
index 00000000000..628de047e0a
--- /dev/null
+++ b/devnet-sdk/testing/testlib/validators/sentinel.go
@@ -0,0 +1,17 @@
+package validators
+
+import "sync/atomic"
+
+var (
+	sentinelID atomic.Uint64
+)
+
+type sentinelMarker struct {
+	id uint64
+}
+
+func newSentinelMarker() *sentinelMarker {
+	return &sentinelMarker{
+		id: sentinelID.Add(1),
+	}
+}
diff --git a/devnet-sdk/testing/testlib/validators/wallet.go b/devnet-sdk/testing/testlib/validators/wallet.go
index 65c7621b427..204add5057d 100644
--- a/devnet-sdk/testing/testlib/validators/wallet.go
+++ b/devnet-sdk/testing/testlib/validators/wallet.go
@@ -33,7 +33,8 @@ func walletFundsValidator(chainIdx uint64, minFunds types.Balance, userMarker in
 }
 
 func AcquireL2WalletWithFunds(chainIdx uint64, minFunds types.Balance) (WalletGetter, systest.PreconditionValidator) {
-	userMarker := &struct{}{}
+	userMarker := newSentinelMarker()
+	fmt.Printf("wallet: %p\n", userMarker)
 	validator := walletFundsValidator(chainIdx, minFunds, userMarker)
 	return func(ctx context.Context) system.Wallet {
 		return ctx.Value(userMarker).(system.Wallet)