diff --git a/cardatatransfer/cardatatransfer.go b/cardatatransfer/cardatatransfer.go
index 667eff1b..9dd226e2 100644
--- a/cardatatransfer/cardatatransfer.go
+++ b/cardatatransfer/cardatatransfer.go
@@ -42,11 +42,6 @@ type carDataTransfer struct {
 	stores   *stores.ReadOnlyBlockstores
 }
 
-// TBD: this is really for internal use only
-// -- maybe we find something that doesn't overlap a protocol range?
-
-const ContextIDCodec multicodec.Code = 0x300001
-
 func StartCarDataTransfer(dt datatransfer.Manager, supplier BlockStoreSupplier) error {
 	cdt := &carDataTransfer{
 		dt:       dt,
@@ -72,7 +67,7 @@ func StartCarDataTransfer(dt datatransfer.Manager, supplier BlockStoreSupplier)
 func MetadataFromContextID(contextID []byte) (stiapi.Metadata, error) {
 	pieceCid, err := cid.Prefix{
 		Version:  1,
-		Codec:    uint64(ContextIDCodec),
+		Codec:    uint64(multicodec.TransportGraphsyncFilecoinv1),
 		MhType:   multihash.IDENTITY,
 		MhLength: -1,
 	}.Sum(contextID)
@@ -148,7 +143,7 @@ func (cdt *carDataTransfer) attemptAcceptDeal(providerDealID ProviderDealID, pro
 
 	// get contextID
 	prefix := proposal.PieceCID.Prefix()
-	if prefix.Codec != uint64(ContextIDCodec) {
+	if prefix.Codec != uint64(multicodec.TransportGraphsyncFilecoinv1) {
 		return DealStatusErrored, errors.New("incorrect Piece CID codec")
 	}
 	if prefix.MhType != multihash.IDENTITY {
diff --git a/cmd/provider/import.go b/cmd/provider/import.go
index 528b54cf..11fa6989 100644
--- a/cmd/provider/import.go
+++ b/cmd/provider/import.go
@@ -11,6 +11,7 @@ import (
 	"github.com/filecoin-project/index-provider/cardatatransfer"
 	adminserver "github.com/filecoin-project/index-provider/server/admin/http"
 	stiapi "github.com/filecoin-project/storetheindex/api/v0"
+	"github.com/multiformats/go-multicodec"
 	"github.com/urfave/cli/v2"
 )
 
@@ -32,7 +33,7 @@ var (
 		Action:  doImportCar,
 	}
 	metadata = stiapi.Metadata{
-		ProtocolID: cardatatransfer.ContextIDCodec,
+		ProtocolID: multicodec.TransportGraphsyncFilecoinv1,
 	}
 )
 
diff --git a/engine/engine.go b/engine/engine.go
index efcb7020..1e7bb1f6 100644
--- a/engine/engine.go
+++ b/engine/engine.go
@@ -10,7 +10,6 @@ import (
 	"github.com/filecoin-project/go-legs/dtsync"
 	"github.com/filecoin-project/go-legs/httpsync"
 	provider "github.com/filecoin-project/index-provider"
-	"github.com/filecoin-project/index-provider/cardatatransfer"
 	"github.com/filecoin-project/index-provider/engine/chunker"
 	stiapi "github.com/filecoin-project/storetheindex/api/v0"
 	"github.com/filecoin-project/storetheindex/api/v0/ingest/schema"
@@ -21,6 +20,7 @@ import (
 	logging "github.com/ipfs/go-log/v2"
 	"github.com/ipld/go-ipld-prime"
 	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
+	"github.com/multiformats/go-multicodec"
 )
 
 const (
@@ -410,7 +410,7 @@ func (e *Engine) publishAdvForIndex(ctx context.Context, contextID []byte, metad
 		// The advertisement still requires a valid metadata even though
 		// metadata is not used for removal.  Create a valid empty metadata.
 		metadata = stiapi.Metadata{
-			ProtocolID: cardatatransfer.ContextIDCodec,
+			ProtocolID: multicodec.TransportGraphsyncFilecoinv1,
 		}
 	}