diff --git a/lib/harmony/harmonydb/sql/20230823.sql b/lib/harmony/harmonydb/sql/20230823.sql
index c16294bf2..fa402dbd3 100644
--- a/lib/harmony/harmonydb/sql/20230823.sql
+++ b/lib/harmony/harmonydb/sql/20230823.sql
@@ -24,5 +24,10 @@ create table wdpost_proofs
     partition          bigint not null,
     submit_at_epoch    bigint not null,
     submit_by_epoch    bigint not null,
-    proof_message      bytea
+    proof_message      bytea,
+
+    submit_task_id     bigint not null,
+
+    constraint wdpost_proofs_identity_key
+        unique (sp_id, deadline, partition)
 );
diff --git a/provider/lpwindow/compute_task.go b/provider/lpwindow/compute_task.go
index 0e59d5d2b..05cc9ae32 100644
--- a/provider/lpwindow/compute_task.go
+++ b/provider/lpwindow/compute_task.go
@@ -149,43 +149,6 @@ func (t *WdPostTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done
 		deadline.Close,
 		msgbuf.Bytes())
 
-	/*submitWdPostParams, err := t.Scheduler.runPoStCycle(context.Background(), false, deadline, ts)
-		if err != nil {
-			log.Errorf("WdPostTask.Do() failed to runPoStCycle: %v", err)
-			return false, err
-		}
-
-		log.Errorf("WdPostTask.Do() called with taskID: %v, submitWdPostParams: %v", taskID, submitWdPostParams)
-
-		// Enter an entry for each wdpost message proof into the wdpost_proofs table
-		for _, params := range submitWdPostParams {
-
-			// Convert submitWdPostParams.Partitions to a byte array using CBOR
-			buf := new(bytes.Buffer)
-			scratch := make([]byte, 9)
-			if err := cbg.WriteMajorTypeHeaderBuf(scratch, buf, cbg.MajArray, uint64(len(params.Partitions))); err != nil {
-				return false, err
-			}
-			for _, v := range params.Partitions {
-				if err := v.MarshalCBOR(buf); err != nil {
-					return false, err
-				}
-			}
-
-			// Insert into wdpost_proofs table
-			_, err = t.db.Exec(context.Background(),
-				`INSERT INTO wdpost_proofs (
-	                           deadline,
-	                           partitions,
-	                           proof_type,
-	                           proof_bytes)
-	    			 VALUES ($1, $2, $3, $4)`,
-				params.Deadline,
-				buf.Bytes(),
-				params.Proofs[0].PoStProof,
-				params.Proofs[0].ProofBytes)
-		}*/
-
 	return true, nil
 }
 
diff --git a/provider/lpwindow/submit_task.go b/provider/lpwindow/submit_task.go
index de0ef94c9..2369a6759 100644
--- a/provider/lpwindow/submit_task.go
+++ b/provider/lpwindow/submit_task.go
@@ -1,11 +1,21 @@
 package lpwindow
 
 import (
+	"context"
+	"github.com/filecoin-project/lotus/chain/types"
+	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
 	"github.com/filecoin-project/lotus/lib/harmony/harmonytask"
 	"github.com/filecoin-project/lotus/lib/harmony/resources"
+	"github.com/filecoin-project/lotus/lib/promise"
+	"github.com/filecoin-project/lotus/provider/chainsched"
+	"github.com/filecoin-project/lotus/provider/lpmessage"
 )
 
 type WdPostSubmitTask struct {
+	sender *lpmessage.Sender
+	db     *harmonydb.DB
+
+	submitPoStTF promise.Promise[harmonytask.AddTaskFunc]
 }
 
 func (w *WdPostSubmitTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bool, err error) {
@@ -18,6 +28,18 @@ func (w *WdPostSubmitTask) CanAccept(ids []harmonytask.TaskID, engine *harmonyta
 	panic("implement me")
 }
 
+func NewWdPostSubmitTask(pcs *chainsched.ProviderChainSched, send *lpmessage.Sender) (*WdPostSubmitTask, error) {
+	res := &WdPostSubmitTask{
+		sender: send,
+	}
+
+	if err := pcs.AddHandler(res.processHeadChange); err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
 func (w *WdPostSubmitTask) TypeDetails() harmonytask.TaskTypeDetails {
 	return harmonytask.TaskTypeDetails{
 		Max:  128,
@@ -25,7 +47,7 @@ func (w *WdPostSubmitTask) TypeDetails() harmonytask.TaskTypeDetails {
 		Cost: resources.Resources{
 			Cpu: 0,
 			Gpu: 0,
-			Ram: 0,
+			Ram: 10 << 20,
 		},
 		MaxFailures: 10,
 		Follows:     nil, // ??
@@ -33,8 +55,45 @@ func (w *WdPostSubmitTask) TypeDetails() harmonytask.TaskTypeDetails {
 }
 
 func (w *WdPostSubmitTask) Adder(taskFunc harmonytask.AddTaskFunc) {
-	//TODO implement me
-	panic("implement me")
+	w.submitPoStTF.Set(taskFunc)
+}
+
+func (w *WdPostSubmitTask) processHeadChange(ctx context.Context, revert, apply *types.TipSet) error {
+	tf := w.submitPoStTF.Val(ctx)
+
+	qry, err := w.db.Query(ctx, `select sp_id, deadline, partition, submit_at_epoch from wdpost_proofs where submit_task_id is null and submit_at_epoch <= $1`, apply.Height())
+	if err != nil {
+		return err
+	}
+	defer qry.Close()
+
+	for qry.Next() {
+		var spID int64
+		var deadline uint64
+		var partition uint64
+		var submitAtEpoch uint64
+		if err := qry.Scan(&spID, &deadline, &partition, &submitAtEpoch); err != nil {
+			return err
+		}
+
+		tf(func(id harmonytask.TaskID, tx *harmonydb.Tx) (shouldCommit bool, err error) {
+			// update in transaction iff submit_task_id is still null
+			res, err := tx.Exec(`update wdpost_proofs set submit_task_id = $1 where sp_id = $2 and deadline = $3 and partition = $4 and submit_task_id is null`, id, spID, deadline, partition)
+			if err != nil {
+				return false, err
+			}
+			if res != 1 {
+				return false, nil
+			}
+
+			return true, nil
+		})
+	}
+	if err := qry.Err(); err != nil {
+		return err
+	}
+
+	return nil
 }
 
 var _ harmonytask.TaskInterface = &WdPostSubmitTask{}