diff --git a/bitswap/client/bitswap_with_sessions_test.go b/bitswap/client/bitswap_with_sessions_test.go
index e28379113..2191a5a90 100644
--- a/bitswap/client/bitswap_with_sessions_test.go
+++ b/bitswap/client/bitswap_with_sessions_test.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/ipfs/boxo/bitswap"
 	"github.com/ipfs/boxo/bitswap/client/internal/session"
+	"github.com/ipfs/boxo/bitswap/client/traceability"
 	testinstance "github.com/ipfs/boxo/bitswap/testinstance"
 	tn "github.com/ipfs/boxo/bitswap/testnet"
 	"github.com/ipfs/boxo/internal/test"
@@ -17,6 +18,7 @@ import (
 	blocksutil "github.com/ipfs/go-ipfs-blocksutil"
 	delay "github.com/ipfs/go-ipfs-delay"
 	tu "github.com/libp2p/go-libp2p-testing/etc"
+	"github.com/libp2p/go-libp2p/core/peer"
 )
 
 func getVirtualNetwork() tn.Network {
@@ -71,9 +73,18 @@ func TestBasicSessions(t *testing.T) {
 	if !blkout.Cid().Equals(block.Cid()) {
 		t.Fatal("got wrong block")
 	}
+
+	traceBlock, ok := blkout.(traceability.Block)
+	if !ok {
+		t.Fatal("did not get tracable block")
+	}
+
+	if traceBlock.From != b.Peer {
+		t.Fatal("should have received block from peer B, did not")
+	}
 }
 
-func assertBlockLists(got, exp []blocks.Block) error {
+func assertBlockListsFrom(from peer.ID, got, exp []blocks.Block) error {
 	if len(got) != len(exp) {
 		return fmt.Errorf("got wrong number of blocks, %d != %d", len(got), len(exp))
 	}
@@ -81,6 +92,13 @@ func assertBlockLists(got, exp []blocks.Block) error {
 	h := cid.NewSet()
 	for _, b := range got {
 		h.Add(b.Cid())
+		traceableBlock, ok := b.(traceability.Block)
+		if !ok {
+			return fmt.Errorf("not a traceable block: %s", b.Cid())
+		}
+		if traceableBlock.From != from {
+			return fmt.Errorf("incorrect peer sent block, expect %s, got %s", from, traceableBlock.From)
+		}
 	}
 	for _, b := range exp {
 		if !h.Has(b.Cid()) {
@@ -133,7 +151,7 @@ func TestSessionBetweenPeers(t *testing.T) {
 		for b := range ch {
 			got = append(got, b)
 		}
-		if err := assertBlockLists(got, blks[i*10:(i+1)*10]); err != nil {
+		if err := assertBlockListsFrom(inst[0].Peer, got, blks[i*10:(i+1)*10]); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -192,7 +210,7 @@ func TestSessionSplitFetch(t *testing.T) {
 		for b := range ch {
 			got = append(got, b)
 		}
-		if err := assertBlockLists(got, blks[i*10:(i+1)*10]); err != nil {
+		if err := assertBlockListsFrom(inst[i].Peer, got, blks[i*10:(i+1)*10]); err != nil {
 			t.Fatal(err)
 		}
 	}
@@ -238,7 +256,7 @@ func TestFetchNotConnected(t *testing.T) {
 	for b := range ch {
 		got = append(got, b)
 	}
-	if err := assertBlockLists(got, blks); err != nil {
+	if err := assertBlockListsFrom(other.Peer, got, blks); err != nil {
 		t.Fatal(err)
 	}
 }
@@ -289,7 +307,7 @@ func TestFetchAfterDisconnect(t *testing.T) {
 		got = append(got, b)
 	}
 
-	if err := assertBlockLists(got, blks[:5]); err != nil {
+	if err := assertBlockListsFrom(peerA.Peer, got, blks[:5]); err != nil {
 		t.Fatal(err)
 	}
 
@@ -318,7 +336,7 @@ func TestFetchAfterDisconnect(t *testing.T) {
 		}
 	}
 
-	if err := assertBlockLists(got, blks); err != nil {
+	if err := assertBlockListsFrom(peerA.Peer, got, blks); err != nil {
 		t.Fatal(err)
 	}
 }