diff --git a/provider/lpffi/sdr_funcs.go b/provider/lpffi/sdr_funcs.go
index d5c2f03fb..955f88a33 100644
--- a/provider/lpffi/sdr_funcs.go
+++ b/provider/lpffi/sdr_funcs.go
@@ -7,14 +7,17 @@ import (
 	ffi "github.com/filecoin-project/filecoin-ffi"
 	commcid "github.com/filecoin-project/go-fil-commcid"
 	"github.com/filecoin-project/go-state-types/abi"
+	"github.com/filecoin-project/lotus/provider/lpproof"
 	"github.com/filecoin-project/lotus/storage/paths"
 	"github.com/filecoin-project/lotus/storage/pipeline/lib/nullreader"
+	"github.com/filecoin-project/lotus/storage/sealer/proofpaths"
 	"github.com/filecoin-project/lotus/storage/sealer/storiface"
 	"github.com/ipfs/go-cid"
 	logging "github.com/ipfs/go-log/v2"
 	"golang.org/x/xerrors"
 	"io"
 	"os"
+	"path/filepath"
 )
 
 var log = logging.Logger("lpffi")
@@ -109,6 +112,21 @@ func (sb *SealCalls) GenerateSDR(ctx context.Context, sector storiface.SectorRef
 	return nil
 }
 
+func (sb *SealCalls) TreeD(ctx context.Context, sector storiface.SectorRef, size abi.PaddedPieceSize, data io.Reader) (cid.Cid, error) {
+	maybeUns := storiface.FTNone
+	// todo sectors with data
+
+	paths, releaseSector, err := sb.sectors.AcquireSector(ctx, sector, maybeUns, storiface.FTCache, storiface.PathSealing)
+	if err != nil {
+		return cid.Undef, xerrors.Errorf("acquiring sector paths: %w", err)
+	}
+	defer releaseSector()
+
+	log.Errorw("oest.idos.hbisor.bpisro.pisro.bpisro.bxsrobpyxsrbpoyxsrgbopyx treed", "paths", paths.Cache)
+
+	return lpproof.BuildTreeD(data, filepath.Join(paths.Cache, proofpaths.TreeDName), size)
+}
+
 func (sb *SealCalls) TreeRC(ctx context.Context, sector storiface.SectorRef, unsealed cid.Cid) (cid.Cid, cid.Cid, error) {
 	p1o, err := sb.makePhase1Out(unsealed, sector.ProofType)
 	if err != nil {
diff --git a/provider/lpseal/task_sdr.go b/provider/lpseal/task_sdr.go
index 86efedafb..f5a92a7e1 100644
--- a/provider/lpseal/task_sdr.go
+++ b/provider/lpseal/task_sdr.go
@@ -123,7 +123,7 @@ func (s *SDRTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bo
 	n, err := s.db.Exec(ctx, `UPDATE sectors_sdr_pipeline
 		SET after_sdr = true, ticket_epoch = $3, ticket_value = $4
 		WHERE sp_id = $1 AND sector_number = $2`,
-		sectorParams.SpID, sectorParams.SectorNumber, ticketEpoch, ticket)
+		sectorParams.SpID, sectorParams.SectorNumber, ticketEpoch, []byte(ticket))
 	if err != nil {
 		return false, xerrors.Errorf("store sdr success: updating pipeline: %w", err)
 	}
diff --git a/provider/lpseal/task_trees.go b/provider/lpseal/task_trees.go
index 610f280f0..a0d27a6ec 100644
--- a/provider/lpseal/task_trees.go
+++ b/provider/lpseal/task_trees.go
@@ -8,6 +8,7 @@ import (
 	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
 	"github.com/filecoin-project/lotus/lib/harmony/resources"
 	"github.com/filecoin-project/lotus/provider/lpffi"
+	"github.com/filecoin-project/lotus/storage/pipeline/lib/nullreader"
 	"github.com/filecoin-project/lotus/storage/sealer/storiface"
 	"golang.org/x/xerrors"
 )
@@ -86,12 +87,21 @@ func (t *TreesTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done
 		ProofType: sectorParams.RegSealProof,
 	}
 
+	// D
+	treeUnsealed, err := t.sc.TreeD(ctx, sref, abi.PaddedPieceSize(ssize), nullreader.NewNullReader(abi.PaddedPieceSize(ssize).Unpadded()))
+	if err != nil {
+		return false, xerrors.Errorf("computing tree d: %w", err)
+	}
+
+	// R / C
 	sealed, unsealed, err := t.sc.TreeRC(ctx, sref, commd)
 	if err != nil {
 		return false, xerrors.Errorf("computing tree r and c: %w", err)
 	}
 
-	// todo tree d!! (?)
+	if unsealed != treeUnsealed {
+		return false, xerrors.Errorf("tree-d and tree-r/c unsealed CIDs disagree")
+	}
 
 	n, err := t.db.Exec(ctx, `UPDATE sectors_sdr_pipeline
 		SET after_tree_r = true, after_tree_c = true, after_tree_d = true, tree_r_cid = $1, tree_d_cid = $3
diff --git a/storage/sealer/proofpaths/cachefiles.go b/storage/sealer/proofpaths/cachefiles.go
index 24b29e9f5..d624e0777 100644
--- a/storage/sealer/proofpaths/cachefiles.go
+++ b/storage/sealer/proofpaths/cachefiles.go
@@ -6,7 +6,8 @@ import (
 	"github.com/filecoin-project/go-state-types/abi"
 )
 
-var dataFilePrefix = "sc-02-data-"
+const dataFilePrefix = "sc-02-data-"
+const TreeDName = dataFilePrefix + "tree-d.dat"
 
 func LayerFileName(layer int) string {
 	return fmt.Sprintf("%slayer-%d.dat", dataFilePrefix, layer)