diff --git a/cmd/lotus-worker/sub.go b/cmd/lotus-worker/sub.go
index db7c70091..e8be9085c 100644
--- a/cmd/lotus-worker/sub.go
+++ b/cmd/lotus-worker/sub.go
@@ -84,7 +84,7 @@ func (w *worker) processTask(ctx context.Context, task sectorbuilder.WorkerTask)
 	}
 
 	if err := w.fetchSector(task.SectorID, task.Type); err != nil {
-		return errRes(err)
+		return errRes(xerrors.Errorf("fetching sector: %w", err))
 	}
 
 	var res sectorbuilder.SealRes
@@ -93,19 +93,19 @@ func (w *worker) processTask(ctx context.Context, task sectorbuilder.WorkerTask)
 	case sectorbuilder.WorkerPreCommit:
 		rspco, err := w.sb.SealPreCommit(task.SectorID, task.SealTicket, task.Pieces)
 		if err != nil {
-			return errRes(err)
+			return errRes(xerrors.Errorf("precomitting: %w", err))
 		}
-		res.Rspco = rspco
+		res.Rspco = rspco.ToJson()
 
 		// TODO: push cache
 
 		if err := w.push("sealed", task.SectorID); err != nil {
-			return errRes(err)
+			return errRes(xerrors.Errorf("pushing precommited data: %w", err))
 		}
 	case sectorbuilder.WorkerCommit:
 		proof, err := w.sb.SealCommit(task.SectorID, task.SealTicket, task.SealSeed, task.Pieces, nil, task.Rspco)
 		if err != nil {
-			return errRes(err)
+			return errRes(xerrors.Errorf("comitting: %w", err))
 		}
 
 		res.Proof = proof
@@ -191,10 +191,6 @@ func (w *worker) push(typ string, sectorID uint64) error {
 		return xerrors.Errorf("non-200 response: %d", resp.StatusCode)
 	}
 
-	if err := f.Close(); err != nil {
-		return err
-	}
-
 	return resp.Body.Close()
 }
 
diff --git a/lib/sectorbuilder/sectorbuilder.go b/lib/sectorbuilder/sectorbuilder.go
index f017635ad..941728e0a 100644
--- a/lib/sectorbuilder/sectorbuilder.go
+++ b/lib/sectorbuilder/sectorbuilder.go
@@ -43,7 +43,7 @@ type SealCommitOutput = sectorbuilder.SealCommitOutput
 
 type PublicPieceInfo = sectorbuilder.PublicPieceInfo
 
-type RawSealPreCommitOutput = sectorbuilder.RawSealPreCommitOutput
+type RawSealPreCommitOutput sectorbuilder.RawSealPreCommitOutput
 
 const CommLen = sectorbuilder.CommitmentBytesLen
 
@@ -74,11 +74,36 @@ type SectorBuilder struct {
 	stopping chan struct{}
 }
 
-type SealRes struct {
-	Err error `json:"omitempty"`
+type JsonRSPCO struct {
+	CommC     []byte
+	CommD     []byte
+	CommR     []byte
+	CommRLast []byte
+}
 
-	Proof []byte                 `json:"omitempty"`
-	Rspco RawSealPreCommitOutput `json:"omitempty"`
+func (rspco *RawSealPreCommitOutput) ToJson() JsonRSPCO {
+	return JsonRSPCO{
+		CommC:     rspco.CommC[:],
+		CommD:     rspco.CommD[:],
+		CommR:     rspco.CommR[:],
+		CommRLast: rspco.CommRLast[:],
+	}
+}
+
+func (rspco *JsonRSPCO) rspco() RawSealPreCommitOutput {
+	var out RawSealPreCommitOutput
+	copy(out.CommC[:], rspco.CommC)
+	copy(out.CommD[:], rspco.CommD)
+	copy(out.CommR[:], rspco.CommR)
+	copy(out.CommRLast[:], rspco.CommRLast)
+	return out
+}
+
+type SealRes struct {
+	Err error
+
+	Proof []byte
+	Rspco JsonRSPCO
 }
 
 type remote struct {
@@ -310,7 +335,7 @@ func (sb *SectorBuilder) ReadPieceFromSealedSector(pieceKey string) ([]byte, err
 func (sb *SectorBuilder) sealPreCommitRemote(call workerCall) (RawSealPreCommitOutput, error) {
 	select {
 	case ret := <-call.ret:
-		return ret.Rspco, ret.Err
+		return ret.Rspco.rspco(), ret.Err
 	case <-sb.stopping:
 		return RawSealPreCommitOutput{}, xerrors.New("sectorbuilder stopped")
 	}
@@ -350,12 +375,12 @@ func (sb *SectorBuilder) SealPreCommit(sectorID uint64, ticket SealTicket, piece
 
 	cacheDir, err := sb.sectorCacheDir(sectorID)
 	if err != nil {
-		return RawSealPreCommitOutput{}, err
+		return RawSealPreCommitOutput{}, xerrors.Errorf("getting cache dir: %w", err)
 	}
 
 	sealedPath, err := sb.SealedSectorPath(sectorID)
 	if err != nil {
-		return RawSealPreCommitOutput{}, err
+		return RawSealPreCommitOutput{}, xerrors.Errorf("getting sealed sector path: %w", err)
 	}
 
 	var sum uint64
@@ -384,7 +409,7 @@ func (sb *SectorBuilder) SealPreCommit(sectorID uint64, ticket SealTicket, piece
 		return RawSealPreCommitOutput{}, xerrors.Errorf("presealing sector %d (%s): %w", sectorID, stagedPath, err)
 	}
 
-	return rspco, nil
+	return RawSealPreCommitOutput(rspco), nil
 }
 
 func (sb *SectorBuilder) sealCommitRemote(call workerCall) (proof []byte, err error) {
@@ -415,9 +440,12 @@ func (sb *SectorBuilder) sealCommitLocal(sectorID uint64, ticket SealTicket, see
 		ticket.TicketBytes,
 		seed.TicketBytes,
 		pieces,
-		rspco,
+		sectorbuilder.RawSealPreCommitOutput(rspco),
 	)
 	if err != nil {
+		log.Warn("StandaloneSealCommit error: ", err)
+		log.Warnf("sid:%d tkt:%v seed:%v, ppi:%v rspco:%v", sectorID, ticket, seed, pieces, rspco)
+
 		return nil, xerrors.Errorf("StandaloneSealCommit: %w", err)
 	}
 
@@ -456,6 +484,10 @@ func (sb *SectorBuilder) SealCommit(sectorID uint64, ticket SealTicket, seed Sea
 		return nil, xerrors.Errorf("commit: %w", err)
 	}
 
+	if pieceKeys == nil {
+		return
+	}
+
 	pmeta := make([]sectorbuilder.PieceMetadata, len(pieces))
 	for i, piece := range pieces {
 		pmeta[i] = sectorbuilder.PieceMetadata{
diff --git a/node/impl/storminer.go b/node/impl/storminer.go
index b1b4f9f82..083097827 100644
--- a/node/impl/storminer.go
+++ b/node/impl/storminer.go
@@ -79,7 +79,7 @@ func (sm *StorageMinerAPI) remotePutSector(w http.ResponseWriter, r *http.Reques
 	defer fr.Close()
 
 	w.WriteHeader(200)
-	n, err := io.Copy(w, fr)
+	n, err := io.Copy(fr, r.Body)
 	if err != nil {
 		log.Error(err)
 		return
@@ -162,6 +162,8 @@ func (sm *StorageMinerAPI) WorkerQueue(ctx context.Context) (<-chan sectorbuilde
 }
 
 func (sm *StorageMinerAPI) WorkerDone(ctx context.Context, task uint64, res sectorbuilder.SealRes) error {
+	log.Infof("WDUN RSPKO %v", res.Rspco)
+
 	return sm.SectorBuilder.TaskDone(ctx, task, res)
 }