diff --git a/.circleci/config.yml b/.circleci/config.yml
index eae5e07c8ff..85bcd045cdd 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1018,7 +1018,6 @@ workflows:
           suite: utest-unit-cli
           target: "./cli/... ./cmd/... ./api/..."
           get-params: true
-          executor: golang-2xl
       - test:
           name: test-unit-node
           requires:
@@ -1026,7 +1025,6 @@ workflows:
           suite: utest-unit-node
           target: "./node/..."
           
-          
       - test:
           name: test-unit-rest
           requires:
@@ -1034,7 +1032,6 @@ workflows:
           suite: utest-unit-rest
           target: "./blockstore/... ./build/... ./chain/... ./conformance/... ./gateway/... ./journal/... ./lib/... ./markets/... ./paychmgr/... ./provider/... ./tools/..."
           
-          executor: golang-2xl
       - test:
           name: test-unit-storage
           requires:
@@ -1042,7 +1039,6 @@ workflows:
           suite: utest-unit-storage
           target: "./storage/... ./extern/..."
           
-          
       - test:
           go-test-flags: "-run=TestMulticoreSDR"
           requires:
diff --git a/.circleci/template.yml b/.circleci/template.yml
index 7bc84c2187f..2bfba956483 100644
--- a/.circleci/template.yml
+++ b/.circleci/template.yml
@@ -567,8 +567,6 @@ workflows:
           suite: utest-[[ $suite ]]
           target: "[[ $pkgs ]]"
           [[if eq $suite "unit-cli"]]get-params: true[[end]]
-          [[if eq $suite "unit-cli"]]executor: golang-2xl[[end]]
-          [[- if eq $suite "unit-rest"]]executor: golang-2xl[[end]]
       [[- end]]
       - test:
           go-test-flags: "-run=TestMulticoreSDR"
diff --git a/cli/util/api.go b/cli/util/api.go
index 7b06efdf324..3602b752de2 100644
--- a/cli/util/api.go
+++ b/cli/util/api.go
@@ -119,7 +119,7 @@ func GetAPIInfoMulti(ctx *cli.Context, t repo.RepoType) ([]APIInfo, error) {
 		}
 	}
 
-	return []APIInfo{}, fmt.Errorf("could not determine API endpoint for node type: %v", t.Type())
+	return []APIInfo{}, fmt.Errorf("could not determine API endpoint for node type: %v. Try setting environment variable: %s", t.Type(), primaryEnv)
 }
 
 func GetAPIInfo(ctx *cli.Context, t repo.RepoType) (APIInfo, error) {
@@ -168,7 +168,7 @@ func GetRawAPIMultiV2(ctx *cli.Context, ainfoCfg []string, version string) ([]Ht
 	var httpHeads []HttpHead
 
 	if len(ainfoCfg) == 0 {
-		return httpHeads, xerrors.Errorf("could not get API info: none configured. \nConsider getting base.toml with './lotus-provider config get base >base.toml' \nthen adding   \n[APIs] \n FULLNODE_API_INFO = [\" result_from lotus auth api-info --perm=admin \"]\n  and updating it with './lotus-provider config set base.toml'")
+		return httpHeads, xerrors.Errorf("could not get API info: none configured. \nConsider getting base.toml with './lotus-provider config get base >/tmp/base.toml' \nthen adding   \n[APIs] \n ChainApiInfo = [\" result_from lotus auth api-info --perm=admin \"]\n  and updating it with './lotus-provider config set /tmp/base.toml'")
 	}
 	for _, i := range ainfoCfg {
 		ainfo := ParseApiInfo(i)
diff --git a/cmd/lotus-provider/migrate.go b/cmd/lotus-provider/migrate.go
index 47095c398af..674a537dfd3 100644
--- a/cmd/lotus-provider/migrate.go
+++ b/cmd/lotus-provider/migrate.go
@@ -11,10 +11,13 @@ import (
 	"strings"
 
 	"github.com/BurntSushi/toml"
+	"github.com/ipfs/go-datastore"
 	"github.com/samber/lo"
 	"github.com/urfave/cli/v2"
 	"golang.org/x/xerrors"
 
+	"github.com/filecoin-project/go-address"
+
 	cliutil "github.com/filecoin-project/lotus/cli/util"
 	"github.com/filecoin-project/lotus/lib/harmony/harmonydb"
 	"github.com/filecoin-project/lotus/node/config"
@@ -33,6 +36,12 @@ var configMigrateCmd = &cli.Command{
 			Value:   "~/.lotusminer",
 			Usage:   fmt.Sprintf("Specify miner repo path. flag(%s) and env(LOTUS_STORAGE_PATH) are DEPRECATION, will REMOVE SOON", FlagMinerRepoDeprecation),
 		},
+		&cli.StringFlag{
+			Name:    "repo",
+			EnvVars: []string{"LOTUS_PATH"},
+			Hidden:  true,
+			Value:   "~/.lotus",
+		},
 		&cli.StringFlag{
 			Name:    "to-layer",
 			Aliases: []string{"t"},
@@ -117,14 +126,20 @@ func fromMiner(cctx *cli.Context) (err error) {
 	}
 
 	// Populate Miner Address
-	sm, cc, err := cliutil.GetStorageMinerAPI(cctx)
+	mmeta, err := lr.Datastore(ctx, "/metadata")
+	if err != nil {
+		return xerrors.Errorf("opening miner metadata datastore: %w", err)
+	}
+	defer mmeta.Close()
+
+	maddrBytes, err := mmeta.Get(ctx, datastore.NewKey("miner-address"))
 	if err != nil {
-		return fmt.Errorf("could not get storageMiner API: %w", err)
+		return xerrors.Errorf("getting miner address datastore entry: %w", err)
 	}
-	defer cc()
-	addr, err := sm.ActorAddress(ctx)
+
+	addr, err := address.NewFromBytes(maddrBytes)
 	if err != nil {
-		return fmt.Errorf("could not read actor address: %w", err)
+		return xerrors.Errorf("parsing miner actor address: %w", err)
 	}
 
 	lpCfg.Addresses.MinerAddresses = []string{addr.String()}
@@ -137,7 +152,8 @@ func fromMiner(cctx *cli.Context) (err error) {
 	if err != nil {
 		return xerrors.Errorf("error getting JWTSecretName: %w", err)
 	}
-	lpCfg.Apis.StorageRPCSecret = base64.RawStdEncoding.EncodeToString(js.PrivateKey)
+
+	lpCfg.Apis.StorageRPCSecret = base64.StdEncoding.EncodeToString(js.PrivateKey)
 
 	// Populate API Key
 	_, header, err := cliutil.GetRawAPI(cctx, repo.FullNode, "v0")
@@ -145,7 +161,11 @@ func fromMiner(cctx *cli.Context) (err error) {
 		return fmt.Errorf("cannot read API: %w", err)
 	}
 
-	lpCfg.Apis.ChainApiInfo = []string{header.Get("Authorization")[7:]}
+	ainfo, err := cliutil.GetAPIInfo(&cli.Context{}, repo.FullNode)
+	if err != nil {
+		return xerrors.Errorf("could not get API info for FullNode: %w", err)
+	}
+	lpCfg.Apis.ChainApiInfo = []string{header.Get("Authorization")[7:] + ":" + ainfo.Addr}
 
 	// Enable WindowPoSt
 	lpCfg.Subsystems.EnableWindowPost = true
@@ -161,7 +181,7 @@ environment variable LOTUS_WORKER_WINDOWPOST.
 	}
 
 	if !lo.Contains(titles, "base") {
-		_, err = db.Exec(ctx, "INSERT INTO harmony_config (title, config) VALUES ('base', '')", "base")
+		_, err = db.Exec(ctx, "INSERT INTO harmony_config (title, config) VALUES ('base', '')")
 		if err != nil {
 			return err
 		}
diff --git a/cmd/lotus-provider/run.go b/cmd/lotus-provider/run.go
index 005cb9ebf2d..2d1bc99cd21 100644
--- a/cmd/lotus-provider/run.go
+++ b/cmd/lotus-provider/run.go
@@ -40,6 +40,7 @@ import (
 	"github.com/filecoin-project/lotus/node/modules/dtypes"
 	"github.com/filecoin-project/lotus/node/repo"
 	"github.com/filecoin-project/lotus/provider"
+	"github.com/filecoin-project/lotus/provider/lpwinning"
 	"github.com/filecoin-project/lotus/storage/paths"
 	"github.com/filecoin-project/lotus/storage/sealer"
 	"github.com/filecoin-project/lotus/storage/sealer/ffiwrapper"
@@ -204,7 +205,10 @@ var runCmd = &cli.Command{
 
 		sa, err := StorageAuth(cfg.Apis.StorageRPCSecret)
 		if err != nil {
-			return xerrors.Errorf("parsing Apis.StorageRPCSecret config: %w", err)
+			return xerrors.Errorf(`'%w' while parsing the config toml's 
+	[Apis]
+	StorageRPCSecret=%v
+Get it with: jq .PrivateKey ~/.lotus-miner/keystore/MF2XI2BNNJ3XILLQOJUXMYLUMU`, err, cfg.Apis.StorageRPCSecret)
 		}
 
 		al := alerting.NewAlertingSystem(j)
@@ -251,6 +255,11 @@ var runCmd = &cli.Command{
 				}
 				activeTasks = append(activeTasks, wdPostTask, wdPoStSubmitTask, derlareRecoverTask)
 			}
+
+			if cfg.Subsystems.EnableWinningPost {
+				winPoStTask := lpwinning.NewWinPostTask(cfg.Subsystems.WinningPostMaxTasks, db, lw, verif, full, maddrs)
+				activeTasks = append(activeTasks, winPoStTask)
+			}
 		}
 		taskEngine, err := harmonytask.New(db, activeTasks, listenAddr)
 		if err != nil {
diff --git a/documentation/en/default-lotus-miner-config.toml b/documentation/en/default-lotus-miner-config.toml
index f7699e635e1..a65e82e9504 100644
--- a/documentation/en/default-lotus-miner-config.toml
+++ b/documentation/en/default-lotus-miner-config.toml
@@ -176,6 +176,16 @@
   # env var: LOTUS_SUBSYSTEMS_DISABLEWINDOWPOST
   #DisableWindowPoSt = false
 
+  # When winning post is disabled, the miner process will NOT attempt to mine
+  # blocks. This should only be set when there's an external process mining
+  # blocks on behalf of the miner.
+  # When disabled and no external block producers are configured, all potential
+  # block rewards will be missed!
+  #
+  # type: bool
+  # env var: LOTUS_SUBSYSTEMS_DISABLEWINNINGPOST
+  #DisableWinningPoSt = false
+
 
 [Dealmaking]
   # When enabled, the miner can accept online deals
diff --git a/documentation/en/default-lotus-provider-config.toml b/documentation/en/default-lotus-provider-config.toml
index cb42c7f5fb5..91606e503fd 100644
--- a/documentation/en/default-lotus-provider-config.toml
+++ b/documentation/en/default-lotus-provider-config.toml
@@ -8,6 +8,9 @@
   # type: bool
   #EnableWinningPost = false
 
+  # type: int
+  #WinningPostMaxTasks = 0
+
 
 [Fees]
   # type: types.FIL
diff --git a/go.sum b/go.sum
index aee413de4ff..fff87909239 100644
--- a/go.sum
+++ b/go.sum
@@ -344,7 +344,6 @@ github.com/filecoin-project/go-state-types v0.0.0-20201102161440-c8033295a1fc/go
 github.com/filecoin-project/go-state-types v0.1.0/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
 github.com/filecoin-project/go-state-types v0.1.6/go.mod h1:UwGVoMsULoCK+bWjEdd/xLCvLAQFBC7EDT477SKml+Q=
 github.com/filecoin-project/go-state-types v0.1.10/go.mod h1:UwGVoMsULoCK+bWjEdd/xLCvLAQFBC7EDT477SKml+Q=
-github.com/filecoin-project/go-state-types v0.11.1/go.mod h1:SyNPwTsU7I22gL2r0OAPcImvLoTVfgRwdK/Y5rR1zz8=
 github.com/filecoin-project/go-state-types v0.11.2-0.20230712101859-8f37624fa540/go.mod h1:SyNPwTsU7I22gL2r0OAPcImvLoTVfgRwdK/Y5rR1zz8=
 github.com/filecoin-project/go-state-types v0.12.5 h1:VQ2N2T3JeUDdIHEo/xhjnT7Q218Wl0UYIyglqT7Z9Ck=
 github.com/filecoin-project/go-state-types v0.12.5/go.mod h1:iJTqGdWDvzXhuVf64Lw0hzt4TIoitMo0VgHdxdjNDZI=
diff --git a/lib/harmony/harmonydb/sql/20230823.sql b/lib/harmony/harmonydb/sql/20230823.sql
index 1865f6afe0f..c6f993d7664 100644
--- a/lib/harmony/harmonydb/sql/20230823.sql
+++ b/lib/harmony/harmonydb/sql/20230823.sql
@@ -37,12 +37,12 @@ create table wdpost_proofs
 create table wdpost_recovery_tasks
 (
     task_id              bigint not null
-        constraint wdpost_partition_tasks_pk
+        constraint wdpost_recovery_tasks_pk
             primary key,
     sp_id                bigint not null,
     proving_period_start bigint not null,
     deadline_index       bigint not null,
     partition_index      bigint not null,
-    constraint wdpost_partition_tasks_identity_key
+    constraint wdpost_recovery_tasks_identity_key
         unique (sp_id, proving_period_start, deadline_index, partition_index)
 );
\ No newline at end of file
diff --git a/lib/harmony/harmonydb/sql/20231110.sql b/lib/harmony/harmonydb/sql/20231110.sql
new file mode 100644
index 00000000000..15b478f4dd1
--- /dev/null
+++ b/lib/harmony/harmonydb/sql/20231110.sql
@@ -0,0 +1,39 @@
+create table mining_tasks
+(
+    task_id bigint not null
+        constraint mining_tasks_pk
+            primary key,
+    sp_id   bigint not null,
+    epoch   bigint not null,
+    base_compute_time timestamp not null,
+
+    won bool not null default false,
+    mined_cid text,
+    mined_header jsonb,
+    mined_at timestamp,
+
+    submitted_at timestamp,
+
+    constraint mining_tasks_sp_epoch
+        unique (sp_id, epoch)
+);
+
+create table mining_base_block
+(
+    id        bigserial not null
+        constraint mining_base_block_pk
+            primary key,
+    task_id   bigint    not null
+        constraint mining_base_block_mining_tasks_task_id_fk
+            references mining_tasks
+            on delete cascade,
+    sp_id     bigint,
+    block_cid text      not null,
+
+    no_win    bool      not null default false,
+
+    constraint mining_base_block_pk2
+        unique (sp_id, task_id, block_cid)
+);
+
+CREATE UNIQUE INDEX mining_base_block_cid_k ON mining_base_block (sp_id, block_cid) WHERE no_win = false;
diff --git a/lib/harmony/harmonydb/sql/20231113.sql b/lib/harmony/harmonydb/sql/20231113.sql
new file mode 100644
index 00000000000..7a71d98aead
--- /dev/null
+++ b/lib/harmony/harmonydb/sql/20231113.sql
@@ -0,0 +1 @@
+ALTER TABLE harmony_task_history ADD COLUMN completed_by_host_and_port varchar(300) NOT NULL;
\ No newline at end of file
diff --git a/lib/harmony/harmonytask/harmonytask.go b/lib/harmony/harmonytask/harmonytask.go
index bb25be54962..595e5b63a61 100644
--- a/lib/harmony/harmonytask/harmonytask.go
+++ b/lib/harmony/harmonytask/harmonytask.go
@@ -106,6 +106,7 @@ type TaskEngine struct {
 	follows        map[string][]followStruct
 	lastFollowTime time.Time
 	lastCleanup    atomic.Value
+	hostAndPort    string
 }
 type followStruct struct {
 	f    func(TaskID, AddTaskFunc) (bool, error)
@@ -129,13 +130,14 @@ func New(
 	}
 	ctx, grace := context.WithCancel(context.Background())
 	e := &TaskEngine{
-		ctx:     ctx,
-		grace:   grace,
-		db:      db,
-		reg:     reg,
-		ownerID: reg.Resources.MachineID, // The current number representing "hostAndPort"
-		taskMap: make(map[string]*taskTypeHandler, len(impls)),
-		follows: make(map[string][]followStruct),
+		ctx:         ctx,
+		grace:       grace,
+		db:          db,
+		reg:         reg,
+		ownerID:     reg.Resources.MachineID, // The current number representing "hostAndPort"
+		taskMap:     make(map[string]*taskTypeHandler, len(impls)),
+		follows:     make(map[string][]followStruct),
+		hostAndPort: hostnameAndPort,
 	}
 	e.lastCleanup.Store(time.Now())
 	for _, c := range impls {
diff --git a/lib/harmony/harmonytask/task_type_handler.go b/lib/harmony/harmonytask/task_type_handler.go
index 09540913d6b..7ec47d32a7c 100644
--- a/lib/harmony/harmonytask/task_type_handler.go
+++ b/lib/harmony/harmonytask/task_type_handler.go
@@ -198,8 +198,8 @@ func (h *taskTypeHandler) recordCompletion(tID TaskID, workStart time.Time, done
 			}
 		}
 		_, err = tx.Exec(`INSERT INTO harmony_task_history 
-												(task_id, name, posted,    work_start, work_end, result, err)
-			 VALUES ($1, $2, $3, $4, $5, $6, $7)`, tID, h.Name, postedTime, workStart, workEnd, done, result)
+									 (task_id,   name, posted,    work_start, work_end, result, by_host_and_port,      err)
+VALUES ($1, $2, $3, $4, $5, $6, $7, $8)`, tID, h.Name, postedTime, workStart, workEnd, done, h.TaskEngine.hostAndPort, result)
 		if err != nil {
 			return false, fmt.Errorf("could not write history: %w", err)
 		}
diff --git a/miner/miner.go b/miner/miner.go
index 329f3417190..d11e9d4aa04 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -71,7 +71,7 @@ func NewMiner(api v1api.FullNode, epp gen.WinningPoStProver, addr address.Addres
 		api:     api,
 		epp:     epp,
 		address: addr,
-		waitFunc: func(ctx context.Context, baseTime uint64) (func(bool, abi.ChainEpoch, error), abi.ChainEpoch, error) {
+		propagationWaitFunc: func(ctx context.Context, baseTime uint64) (func(bool, abi.ChainEpoch, error), abi.ChainEpoch, error) {
 			// wait around for half the block time in case other parents come in
 			//
 			// if we're mining a block in the past via catch-up/rush mining,
@@ -114,7 +114,7 @@ type Miner struct {
 	stop     chan struct{}
 	stopping chan struct{}
 
-	waitFunc waitFunc
+	propagationWaitFunc waitFunc
 
 	// lastWork holds the last MiningBase we built upon.
 	lastWork *MiningBase
@@ -205,15 +205,21 @@ func (m *Miner) mine(ctx context.Context) {
 	ctx, span := trace.StartSpan(ctx, "/mine")
 	defer span.End()
 
+	// Perform the Winning PoSt warmup in a separate goroutine.
 	go m.doWinPoStWarmup(ctx)
 
 	var lastBase MiningBase
+
+	// Start the main mining loop.
 minerLoop:
 	for {
+		// Prepare a context for a single node operation.
 		ctx := cliutil.OnSingleNode(ctx)
 
+		// Handle stop signals.
 		select {
 		case <-m.stop:
+			// If a stop signal is received, clean up and exit the mining loop.
 			stopping := m.stopping
 			m.stop = nil
 			m.stopping = nil
@@ -223,10 +229,11 @@ minerLoop:
 		default:
 		}
 
-		var base *MiningBase
+		var base *MiningBase // NOTE: This points to m.lastWork; Incrementing nulls here will increment it there.
 		var onDone func(bool, abi.ChainEpoch, error)
 		var injectNulls abi.ChainEpoch
 
+		// Look for the best mining candidate.
 		for {
 			prebase, err := m.GetBestMiningCandidate(ctx)
 			if err != nil {
@@ -237,6 +244,7 @@ minerLoop:
 				continue
 			}
 
+			// Check if we have a new base or if the current base is still valid.
 			if base != nil && base.TipSet.Height() == prebase.TipSet.Height() && base.NullRounds == prebase.NullRounds {
 				base = prebase
 				break
@@ -253,13 +261,13 @@ minerLoop:
 			// best mining candidate at that time.
 
 			// Wait until propagation delay period after block we plan to mine on
-			onDone, injectNulls, err = m.waitFunc(ctx, prebase.TipSet.MinTimestamp())
+			onDone, injectNulls, err = m.propagationWaitFunc(ctx, prebase.TipSet.MinTimestamp())
 			if err != nil {
 				log.Error(err)
 				continue
 			}
 
-			// just wait for the beacon entry to become available before we select our final mining base
+			// Ensure the beacon entry is available before finalizing the mining base.
 			_, err = m.api.StateGetBeaconEntry(ctx, prebase.TipSet.Height()+prebase.NullRounds+1)
 			if err != nil {
 				log.Errorf("failed getting beacon entry: %s", err)
@@ -272,8 +280,9 @@ minerLoop:
 			base = prebase
 		}
 
-		base.NullRounds += injectNulls // testing
+		base.NullRounds += injectNulls // Adjust for testing purposes.
 
+		// Check for repeated mining candidates and handle sleep for the next round.
 		if base.TipSet.Equals(lastBase.TipSet) && lastBase.NullRounds == base.NullRounds {
 			log.Warnf("BestMiningCandidate from the previous round: %s (nulls:%d)", lastBase.TipSet.Cids(), lastBase.NullRounds)
 			if !m.niceSleep(time.Duration(build.BlockDelaySecs) * time.Second) {
@@ -282,6 +291,7 @@ minerLoop:
 			continue
 		}
 
+		// Attempt to mine a block.
 		b, err := m.mineOne(ctx, base)
 		if err != nil {
 			log.Errorf("mining block failed: %+v", err)
@@ -299,9 +309,12 @@ minerLoop:
 		}
 		onDone(b != nil, h, nil)
 
+		// Process the mined block.
 		if b != nil {
+			// Record the event of mining a block.
 			m.journal.RecordEvent(m.evtTypes[evtTypeBlockMined], func() interface{} {
 				return map[string]interface{}{
+					// Data about the mined block.
 					"parents":   base.TipSet.Cids(),
 					"nulls":     base.NullRounds,
 					"epoch":     b.Header.Height,
@@ -312,19 +325,23 @@ minerLoop:
 
 			btime := time.Unix(int64(b.Header.Timestamp), 0)
 			now := build.Clock.Now()
+			// Handle timing for broadcasting the block.
 			switch {
 			case btime == now:
 				// block timestamp is perfectly aligned with time.
 			case btime.After(now):
+				// Wait until it's time to broadcast the block.
 				if !m.niceSleep(build.Clock.Until(btime)) {
 					log.Warnf("received interrupt while waiting to broadcast block, will shutdown after block is sent out")
 					build.Clock.Sleep(build.Clock.Until(btime))
 				}
 			default:
+				// Log if the block was mined in the past.
 				log.Warnw("mined block in the past",
 					"block-time", btime, "time", build.Clock.Now(), "difference", build.Clock.Since(btime))
 			}
 
+			// Check for slash filter conditions.
 			if os.Getenv("LOTUS_MINER_NO_SLASHFILTER") != "_yes_i_know_i_can_and_probably_will_lose_all_my_fil_and_power_" && !build.IsNearUpgrade(base.TipSet.Height(), build.UpgradeWatermelonFixHeight) {
 				witness, fault, err := m.sf.MinedBlock(ctx, b.Header, base.TipSet.Height()+base.NullRounds)
 				if err != nil {
@@ -339,25 +356,27 @@ minerLoop:
 				}
 			}
 
+			// Check for blocks created at the same height.
 			if _, ok := m.minedBlockHeights.Get(b.Header.Height); ok {
 				log.Warnw("Created a block at the same height as another block we've created", "height", b.Header.Height, "miner", b.Header.Miner, "parents", b.Header.Parents)
 				continue
 			}
 
+			// Add the block height to the mined block heights.
 			m.minedBlockHeights.Add(b.Header.Height, true)
 
+			// Submit the newly mined block.
 			if err := m.api.SyncSubmitBlock(ctx, b); err != nil {
 				log.Errorf("failed to submit newly mined block: %+v", err)
 			}
 		} else {
+			// If no block was mined, increase the null rounds and wait for the next epoch.
 			base.NullRounds++
 
-			// Wait until the next epoch, plus the propagation delay, so a new tipset
-			// has enough time to form.
-			//
-			// See:  https://github.com/filecoin-project/lotus/issues/1845
+			// Calculate the time for the next round.
 			nextRound := time.Unix(int64(base.TipSet.MinTimestamp()+build.BlockDelaySecs*uint64(base.NullRounds))+int64(build.PropagationDelaySecs), 0)
 
+			// Wait for the next round or stop signal.
 			select {
 			case <-build.Clock.After(build.Clock.Until(nextRound)):
 			case <-m.stop:
diff --git a/miner/testminer.go b/miner/testminer.go
index f1d11bae0a6..e23b26ae29f 100644
--- a/miner/testminer.go
+++ b/miner/testminer.go
@@ -28,13 +28,13 @@ func NewTestMiner(nextCh <-chan MineReq, addr address.Address) func(v1api.FullNo
 		}
 
 		m := &Miner{
-			api:               api,
-			waitFunc:          chanWaiter(nextCh),
-			epp:               epp,
-			minedBlockHeights: arc,
-			address:           addr,
-			sf:                slashfilter.New(ds.NewMapDatastore()),
-			journal:           journal.NilJournal(),
+			api:                 api,
+			propagationWaitFunc: chanWaiter(nextCh),
+			epp:                 epp,
+			minedBlockHeights:   arc,
+			address:             addr,
+			sf:                  slashfilter.New(ds.NewMapDatastore()),
+			journal:             journal.NilJournal(),
 		}
 
 		if err := m.Start(context.TODO()); err != nil {
diff --git a/node/builder_miner.go b/node/builder_miner.go
index 4ba5f05b57f..dd35c6becf9 100644
--- a/node/builder_miner.go
+++ b/node/builder_miner.go
@@ -121,8 +121,12 @@ func ConfigStorageMiner(c interface{}) Option {
 
 			// Mining / proving
 			Override(new(*slashfilter.SlashFilter), modules.NewSlashFilter),
-			Override(new(*miner.Miner), modules.SetupBlockProducer),
-			Override(new(gen.WinningPoStProver), storage.NewWinningPoStProver),
+
+			If(!cfg.Subsystems.DisableWinningPoSt,
+				Override(new(*miner.Miner), modules.SetupBlockProducer),
+				Override(new(gen.WinningPoStProver), storage.NewWinningPoStProver),
+			),
+
 			Override(PreflightChecksKey, modules.PreflightChecks),
 			Override(new(*sealing.Sealing), modules.SealingPipeline(cfg.Fees)),
 
diff --git a/node/config/doc_gen.go b/node/config/doc_gen.go
index a65bd874665..13ecb2706e3 100644
--- a/node/config/doc_gen.go
+++ b/node/config/doc_gen.go
@@ -31,10 +31,10 @@ var Doc = map[string][]DocField{
 	},
 	"ApisConfig": {
 		{
-			Name: "FULLNODE_API_INFO",
+			Name: "ChainApiInfo",
 			Type: "[]string",
 
-			Comment: `FULLNODE_API_INFO is the API endpoint for the Lotus daemon.`,
+			Comment: `ChainApiInfo is the API endpoint for the Lotus daemon.`,
 		},
 		{
 			Name: "StorageRPCSecret",
@@ -977,6 +977,16 @@ This option will stop lotus-miner from performing any actions related
 to window post, including scheduling, submitting proofs, and recovering
 sectors.`,
 		},
+		{
+			Name: "DisableWinningPoSt",
+			Type: "bool",
+
+			Comment: `When winning post is disabled, the miner process will NOT attempt to mine
+blocks. This should only be set when there's an external process mining
+blocks on behalf of the miner.
+When disabled and no external block producers are configured, all potential
+block rewards will be missed!`,
+		},
 	},
 	"ProviderSubsystemsConfig": {
 		{
@@ -995,6 +1005,12 @@ sectors.`,
 			Name: "EnableWinningPost",
 			Type: "bool",
 
+			Comment: ``,
+		},
+		{
+			Name: "WinningPostMaxTasks",
+			Type: "int",
+
 			Comment: ``,
 		},
 	},
diff --git a/node/config/types.go b/node/config/types.go
index 120e5024826..2152e079569 100644
--- a/node/config/types.go
+++ b/node/config/types.go
@@ -92,9 +92,10 @@ type JournalConfig struct {
 }
 
 type ProviderSubsystemsConfig struct {
-	EnableWindowPost   bool
-	WindowPostMaxTasks int
-	EnableWinningPost  bool
+	EnableWindowPost    bool
+	WindowPostMaxTasks  int
+	EnableWinningPost   bool
+	WinningPostMaxTasks int
 }
 
 type DAGStoreConfig struct {
@@ -161,6 +162,13 @@ type MinerSubsystemConfig struct {
 	//   to window post, including scheduling, submitting proofs, and recovering
 	//   sectors.
 	DisableWindowPoSt bool
+
+	// When winning post is disabled, the miner process will NOT attempt to mine
+	// blocks. This should only be set when there's an external process mining
+	// blocks on behalf of the miner.
+	// When disabled and no external block producers are configured, all potential
+	// block rewards will be missed!
+	DisableWinningPoSt bool
 }
 
 type DealmakingConfig struct {
diff --git a/node/repo/fsrepo.go b/node/repo/fsrepo.go
index bd3e2fe2787..d8e41fb2bdf 100644
--- a/node/repo/fsrepo.go
+++ b/node/repo/fsrepo.go
@@ -346,7 +346,7 @@ func (fsr *FsRepo) APIEndpoint() (multiaddr.Multiaddr, error) {
 
 	f, err := os.Open(p)
 	if os.IsNotExist(err) {
-		return nil, ErrNoAPIEndpoint
+		return nil, xerrors.Errorf("No file (%s): %w", p, ErrNoAPIEndpoint)
 	} else if err != nil {
 		return nil, err
 	}
diff --git a/provider/lpwindow/compute_do.go b/provider/lpwindow/compute_do.go
index d36541e8e1d..ba13cdc2b53 100644
--- a/provider/lpwindow/compute_do.go
+++ b/provider/lpwindow/compute_do.go
@@ -3,8 +3,6 @@ package lpwindow
 import (
 	"bytes"
 	"context"
-	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
-	"github.com/filecoin-project/lotus/storage/sealer"
 	"sort"
 	"sync"
 	"time"
@@ -25,7 +23,9 @@ import (
 	proof7 "github.com/filecoin-project/specs-actors/v7/actors/runtime/proof"
 
 	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
 	types "github.com/filecoin-project/lotus/chain/types"
+	"github.com/filecoin-project/lotus/storage/sealer"
 	"github.com/filecoin-project/lotus/storage/sealer/storiface"
 )
 
diff --git a/provider/lpwindow/recover_task.go b/provider/lpwindow/recover_task.go
index d50fddc0e31..fafe76e569b 100644
--- a/provider/lpwindow/recover_task.go
+++ b/provider/lpwindow/recover_task.go
@@ -2,11 +2,15 @@ package lpwindow
 
 import (
 	"context"
+
+	"golang.org/x/xerrors"
+
 	"github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-bitfield"
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/builtin"
 	"github.com/filecoin-project/go-state-types/dline"
+
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/chain/actors"
 	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
@@ -21,7 +25,6 @@ import (
 	"github.com/filecoin-project/lotus/storage/ctladdr"
 	"github.com/filecoin-project/lotus/storage/sealer"
 	"github.com/filecoin-project/lotus/storage/wdpost"
-	"golang.org/x/xerrors"
 )
 
 type WdPostRecoverDeclareTask struct {
diff --git a/provider/lpwinning/winning_task.go b/provider/lpwinning/winning_task.go
new file mode 100644
index 00000000000..56d66692158
--- /dev/null
+++ b/provider/lpwinning/winning_task.go
@@ -0,0 +1,641 @@
+package lpwinning
+
+import (
+	"bytes"
+	"context"
+	"crypto/rand"
+	"encoding/binary"
+	"encoding/json"
+	"time"
+
+	"github.com/ipfs/go-cid"
+	logging "github.com/ipfs/go-log/v2"
+	"golang.org/x/xerrors"
+
+	ffi "github.com/filecoin-project/filecoin-ffi"
+	"github.com/filecoin-project/go-address"
+	"github.com/filecoin-project/go-state-types/abi"
+	"github.com/filecoin-project/go-state-types/crypto"
+	"github.com/filecoin-project/go-state-types/network"
+	prooftypes "github.com/filecoin-project/go-state-types/proof"
+
+	"github.com/filecoin-project/lotus/api"
+	"github.com/filecoin-project/lotus/build"
+	"github.com/filecoin-project/lotus/chain/gen"
+	lrand "github.com/filecoin-project/lotus/chain/rand"
+	"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/node/modules/dtypes"
+	"github.com/filecoin-project/lotus/storage/sealer/storiface"
+)
+
+var log = logging.Logger("lpwinning")
+
+type WinPostTask struct {
+	max int
+	db  *harmonydb.DB
+
+	prover   ProverWinningPoSt
+	verifier storiface.Verifier
+
+	api    WinPostAPI
+	actors []dtypes.MinerAddress
+
+	mineTF promise.Promise[harmonytask.AddTaskFunc]
+}
+
+type WinPostAPI interface {
+	ChainHead(context.Context) (*types.TipSet, error)
+	ChainTipSetWeight(context.Context, types.TipSetKey) (types.BigInt, error)
+	ChainGetTipSet(context.Context, types.TipSetKey) (*types.TipSet, error)
+
+	StateGetBeaconEntry(context.Context, abi.ChainEpoch) (*types.BeaconEntry, error)
+	SyncSubmitBlock(context.Context, *types.BlockMsg) error
+	StateGetRandomnessFromBeacon(ctx context.Context, personalization crypto.DomainSeparationTag, randEpoch abi.ChainEpoch, entropy []byte, tsk types.TipSetKey) (abi.Randomness, error)
+	StateGetRandomnessFromTickets(ctx context.Context, personalization crypto.DomainSeparationTag, randEpoch abi.ChainEpoch, entropy []byte, tsk types.TipSetKey) (abi.Randomness, error)
+	StateNetworkVersion(context.Context, types.TipSetKey) (network.Version, error)
+	StateMinerInfo(context.Context, address.Address, types.TipSetKey) (api.MinerInfo, error)
+
+	MinerGetBaseInfo(context.Context, address.Address, abi.ChainEpoch, types.TipSetKey) (*api.MiningBaseInfo, error)
+	MinerCreateBlock(context.Context, *api.BlockTemplate) (*types.BlockMsg, error)
+	MpoolSelect(context.Context, types.TipSetKey, float64) ([]*types.SignedMessage, error)
+
+	WalletSign(context.Context, address.Address, []byte) (*crypto.Signature, error)
+}
+
+type ProverWinningPoSt interface {
+	GenerateWinningPoSt(ctx context.Context, ppt abi.RegisteredPoStProof, minerID abi.ActorID, sectorInfo []storiface.PostSectorChallenge, randomness abi.PoStRandomness) ([]prooftypes.PoStProof, error)
+}
+
+func NewWinPostTask(max int, db *harmonydb.DB, prover ProverWinningPoSt, verifier storiface.Verifier, api WinPostAPI, actors []dtypes.MinerAddress) *WinPostTask {
+	t := &WinPostTask{
+		max:      max,
+		db:       db,
+		prover:   prover,
+		verifier: verifier,
+		api:      api,
+		actors:   actors,
+	}
+	// TODO: run warmup
+
+	go t.mineBasic(context.TODO())
+
+	return t
+}
+
+func (t *WinPostTask) Do(taskID harmonytask.TaskID, stillOwned func() bool) (done bool, err error) {
+	log.Debugw("WinPostTask.Do()", "taskID", taskID)
+
+	ctx := context.TODO()
+
+	type BlockCID struct {
+		CID string
+	}
+
+	type MiningTaskDetails struct {
+		SpID      uint64
+		Epoch     uint64
+		BlockCIDs []BlockCID
+		CompTime  time.Time
+	}
+
+	var details MiningTaskDetails
+
+	// First query to fetch from mining_tasks
+	err = t.db.QueryRow(ctx, `SELECT sp_id, epoch, base_compute_time FROM mining_tasks WHERE task_id = $1`, taskID).Scan(&details.SpID, &details.Epoch, &details.CompTime)
+	if err != nil {
+		return false, err
+	}
+
+	// Second query to fetch from mining_base_block
+	rows, err := t.db.Query(ctx, `SELECT block_cid FROM mining_base_block WHERE task_id = $1`, taskID)
+	if err != nil {
+		return false, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var cid BlockCID
+		if err := rows.Scan(&cid.CID); err != nil {
+			return false, err
+		}
+		details.BlockCIDs = append(details.BlockCIDs, cid)
+	}
+
+	if err := rows.Err(); err != nil {
+		return false, err
+	}
+
+	// construct base
+	maddr, err := address.NewIDAddress(details.SpID)
+	if err != nil {
+		return false, err
+	}
+
+	var bcids []cid.Cid
+	for _, c := range details.BlockCIDs {
+		bcid, err := cid.Parse(c.CID)
+		if err != nil {
+			return false, err
+		}
+		bcids = append(bcids, bcid)
+	}
+
+	tsk := types.NewTipSetKey(bcids...)
+	baseTs, err := t.api.ChainGetTipSet(ctx, tsk)
+	if err != nil {
+		return false, xerrors.Errorf("loading base tipset: %w", err)
+	}
+
+	base := MiningBase{
+		TipSet:      baseTs,
+		AddRounds:   abi.ChainEpoch(details.Epoch) - baseTs.Height() - 1,
+		ComputeTime: details.CompTime,
+	}
+
+	persistNoWin := func() error {
+		_, err := t.db.Exec(ctx, `UPDATE mining_base_block SET no_win = true WHERE task_id = $1`, taskID)
+		if err != nil {
+			return xerrors.Errorf("marking base as not-won: %w", err)
+		}
+
+		return nil
+	}
+
+	// ensure we have a beacon entry for the epoch we're mining on
+	round := base.epoch()
+
+	_ = retry1(func() (*types.BeaconEntry, error) {
+		return t.api.StateGetBeaconEntry(ctx, round)
+	})
+
+	// MAKE A MINING ATTEMPT!!
+	log.Debugw("attempting to mine a block", "tipset", types.LogCids(base.TipSet.Cids()))
+
+	mbi, err := t.api.MinerGetBaseInfo(ctx, maddr, round, base.TipSet.Key())
+	if err != nil {
+		return false, xerrors.Errorf("failed to get mining base info: %w", err)
+	}
+	if mbi == nil {
+		// not eligible to mine on this base, we're done here
+		log.Debugw("WinPoSt not eligible to mine on this base", "tipset", types.LogCids(base.TipSet.Cids()))
+		return true, persistNoWin()
+	}
+
+	if !mbi.EligibleForMining {
+		// slashed or just have no power yet, we're done here
+		log.Debugw("WinPoSt not eligible for mining", "tipset", types.LogCids(base.TipSet.Cids()))
+		return true, persistNoWin()
+	}
+
+	if len(mbi.Sectors) == 0 {
+		log.Warnw("WinPoSt no sectors to mine", "tipset", types.LogCids(base.TipSet.Cids()))
+		return false, xerrors.Errorf("no sectors selected for winning PoSt")
+	}
+
+	var rbase types.BeaconEntry
+	var bvals []types.BeaconEntry
+	var eproof *types.ElectionProof
+
+	// winner check
+	{
+		bvals = mbi.BeaconEntries
+		rbase = mbi.PrevBeaconEntry
+		if len(bvals) > 0 {
+			rbase = bvals[len(bvals)-1]
+		}
+
+		eproof, err = gen.IsRoundWinner(ctx, round, maddr, rbase, mbi, t.api)
+		if err != nil {
+			log.Warnw("WinPoSt failed to check if we win next round", "error", err)
+			return false, xerrors.Errorf("failed to check if we win next round: %w", err)
+		}
+
+		if eproof == nil {
+			// not a winner, we're done here
+			log.Debugw("WinPoSt not a winner", "tipset", types.LogCids(base.TipSet.Cids()))
+			return true, persistNoWin()
+		}
+	}
+
+	// winning PoSt
+	var wpostProof []prooftypes.PoStProof
+	{
+		buf := new(bytes.Buffer)
+		if err := maddr.MarshalCBOR(buf); err != nil {
+			err = xerrors.Errorf("failed to marshal miner address: %w", err)
+			return false, err
+		}
+
+		brand, err := lrand.DrawRandomnessFromBase(rbase.Data, crypto.DomainSeparationTag_WinningPoStChallengeSeed, round, buf.Bytes())
+		if err != nil {
+			err = xerrors.Errorf("failed to get randomness for winning post: %w", err)
+			return false, err
+		}
+
+		prand := abi.PoStRandomness(brand)
+		prand[31] &= 0x3f // make into fr
+
+		sectorNums := make([]abi.SectorNumber, len(mbi.Sectors))
+		for i, s := range mbi.Sectors {
+			sectorNums[i] = s.SectorNumber
+		}
+
+		ppt, err := mbi.Sectors[0].SealProof.RegisteredWinningPoStProof()
+		if err != nil {
+			return false, xerrors.Errorf("mapping sector seal proof type to post proof type: %w", err)
+		}
+
+		postChallenges, err := ffi.GeneratePoStFallbackSectorChallenges(ppt, abi.ActorID(details.SpID), prand, sectorNums)
+		if err != nil {
+			return false, xerrors.Errorf("generating election challenges: %v", err)
+		}
+
+		sectorChallenges := make([]storiface.PostSectorChallenge, len(mbi.Sectors))
+		for i, s := range mbi.Sectors {
+			sectorChallenges[i] = storiface.PostSectorChallenge{
+				SealProof:    s.SealProof,
+				SectorNumber: s.SectorNumber,
+				SealedCID:    s.SealedCID,
+				Challenge:    postChallenges.Challenges[s.SectorNumber],
+				Update:       s.SectorKey != nil,
+			}
+		}
+
+		wpostProof, err = t.prover.GenerateWinningPoSt(ctx, ppt, abi.ActorID(details.SpID), sectorChallenges, prand)
+		if err != nil {
+			err = xerrors.Errorf("failed to compute winning post proof: %w", err)
+			return false, err
+		}
+	}
+
+	ticket, err := t.computeTicket(ctx, maddr, &rbase, round, base.TipSet.MinTicket(), mbi)
+	if err != nil {
+		return false, xerrors.Errorf("scratching ticket failed: %w", err)
+	}
+
+	// get pending messages early,
+	msgs, err := t.api.MpoolSelect(ctx, base.TipSet.Key(), ticket.Quality())
+	if err != nil {
+		return false, xerrors.Errorf("failed to select messages for block: %w", err)
+	}
+
+	// equivocation handling
+	{
+		// This next block exists to "catch" equivocating miners,
+		// who submit 2 blocks at the same height at different times in order to split the network.
+		// To safeguard against this, we make sure it's been EquivocationDelaySecs since our base was calculated,
+		// then re-calculate it.
+		// If the daemon detected equivocated blocks, those blocks will no longer be in the new base.
+		time.Sleep(time.Until(base.ComputeTime.Add(time.Duration(build.EquivocationDelaySecs) * time.Second)))
+
+		bestTs, err := t.api.ChainHead(ctx)
+		if err != nil {
+			return false, xerrors.Errorf("failed to get chain head: %w", err)
+		}
+
+		headWeight, err := t.api.ChainTipSetWeight(ctx, bestTs.Key())
+		if err != nil {
+			return false, xerrors.Errorf("failed to get chain head weight: %w", err)
+		}
+
+		baseWeight, err := t.api.ChainTipSetWeight(ctx, base.TipSet.Key())
+		if err != nil {
+			return false, xerrors.Errorf("failed to get base weight: %w", err)
+		}
+		if types.BigCmp(headWeight, baseWeight) <= 0 {
+			bestTs = base.TipSet
+		}
+
+		// If the base has changed, we take the _intersection_ of our old base and new base,
+		// thus ejecting blocks from any equivocating miners, without taking any new blocks.
+		if bestTs.Height() == base.TipSet.Height() && !bestTs.Equals(base.TipSet) {
+			log.Warnf("base changed from %s to %s, taking intersection", base.TipSet.Key(), bestTs.Key())
+			newBaseMap := map[cid.Cid]struct{}{}
+			for _, newBaseBlk := range bestTs.Cids() {
+				newBaseMap[newBaseBlk] = struct{}{}
+			}
+
+			refreshedBaseBlocks := make([]*types.BlockHeader, 0, len(base.TipSet.Cids()))
+			for _, baseBlk := range base.TipSet.Blocks() {
+				if _, ok := newBaseMap[baseBlk.Cid()]; ok {
+					refreshedBaseBlocks = append(refreshedBaseBlocks, baseBlk)
+				}
+			}
+
+			if len(refreshedBaseBlocks) != 0 && len(refreshedBaseBlocks) != len(base.TipSet.Blocks()) {
+				refreshedBase, err := types.NewTipSet(refreshedBaseBlocks)
+				if err != nil {
+					return false, xerrors.Errorf("failed to create new tipset when refreshing: %w", err)
+				}
+
+				if !base.TipSet.MinTicket().Equals(refreshedBase.MinTicket()) {
+					log.Warn("recomputing ticket due to base refresh")
+
+					ticket, err = t.computeTicket(ctx, maddr, &rbase, round, refreshedBase.MinTicket(), mbi)
+					if err != nil {
+						return false, xerrors.Errorf("failed to refresh ticket: %w", err)
+					}
+				}
+
+				log.Warn("re-selecting messages due to base refresh")
+				// refresh messages, as the selected messages may no longer be valid
+				msgs, err = t.api.MpoolSelect(ctx, refreshedBase.Key(), ticket.Quality())
+				if err != nil {
+					return false, xerrors.Errorf("failed to re-select messages for block: %w", err)
+				}
+
+				base.TipSet = refreshedBase
+			}
+		}
+	}
+
+	// block construction
+	var blockMsg *types.BlockMsg
+	{
+		uts := base.TipSet.MinTimestamp() + build.BlockDelaySecs*(uint64(base.AddRounds)+1)
+
+		blockMsg, err = t.api.MinerCreateBlock(context.TODO(), &api.BlockTemplate{
+			Miner:            maddr,
+			Parents:          base.TipSet.Key(),
+			Ticket:           ticket,
+			Eproof:           eproof,
+			BeaconValues:     bvals,
+			Messages:         msgs,
+			Epoch:            round,
+			Timestamp:        uts,
+			WinningPoStProof: wpostProof,
+		})
+		if err != nil {
+			return false, xerrors.Errorf("failed to create block: %w", err)
+		}
+	}
+
+	// persist in db
+	{
+		bhjson, err := json.Marshal(blockMsg.Header)
+		if err != nil {
+			return false, xerrors.Errorf("failed to marshal block header: %w", err)
+		}
+
+		_, err = t.db.Exec(ctx, `UPDATE mining_tasks
+            SET won = true, mined_cid = $2, mined_header = $3, mined_at = $4
+            WHERE task_id = $1`, taskID, blockMsg.Header.Cid(), string(bhjson), time.Now().UTC())
+		if err != nil {
+			return false, xerrors.Errorf("failed to update mining task: %w", err)
+		}
+	}
+
+	// wait until block timestamp
+	{
+		time.Sleep(time.Until(time.Unix(int64(blockMsg.Header.Timestamp), 0)))
+	}
+
+	// submit block!!
+	{
+		if err := t.api.SyncSubmitBlock(ctx, blockMsg); err != nil {
+			return false, xerrors.Errorf("failed to submit block: %w", err)
+		}
+	}
+
+	log.Infow("mined a block", "tipset", types.LogCids(blockMsg.Header.Parents), "height", blockMsg.Header.Height, "miner", maddr, "cid", blockMsg.Header.Cid())
+
+	// persist that we've submitted the block
+	{
+		_, err = t.db.Exec(ctx, `UPDATE mining_tasks
+		SET submitted_at = $2
+		WHERE task_id = $1`, taskID, time.Now().UTC())
+		if err != nil {
+			return false, xerrors.Errorf("failed to update mining task: %w", err)
+		}
+	}
+
+	return true, nil
+}
+
+func (t *WinPostTask) CanAccept(ids []harmonytask.TaskID, engine *harmonytask.TaskEngine) (*harmonytask.TaskID, error) {
+	if len(ids) == 0 {
+		// probably can't happen, but panicking is bad
+		return nil, nil
+	}
+
+	// select lowest epoch
+	var lowestEpoch abi.ChainEpoch
+	var lowestEpochID = ids[0]
+	for _, id := range ids {
+		var epoch uint64
+		err := t.db.QueryRow(context.Background(), `SELECT epoch FROM mining_tasks WHERE task_id = $1`, id).Scan(&epoch)
+		if err != nil {
+			return nil, err
+		}
+
+		if lowestEpoch == 0 || abi.ChainEpoch(epoch) < lowestEpoch {
+			lowestEpoch = abi.ChainEpoch(epoch)
+			lowestEpochID = id
+		}
+	}
+
+	return &lowestEpochID, nil
+}
+
+func (t *WinPostTask) TypeDetails() harmonytask.TaskTypeDetails {
+	return harmonytask.TaskTypeDetails{
+		Name:        "WinPost",
+		Max:         t.max,
+		MaxFailures: 3,
+		Follows:     nil,
+		Cost: resources.Resources{
+			Cpu: 1,
+
+			// todo set to something for 32/64G sector sizes? Technically windowPoSt is happy on a CPU
+			//  but it will use a GPU if available
+			Gpu: 0,
+
+			Ram: 1 << 30, // todo arbitrary number
+		},
+	}
+}
+
+func (t *WinPostTask) Adder(taskFunc harmonytask.AddTaskFunc) {
+	t.mineTF.Set(taskFunc)
+}
+
+// MiningBase is the tipset on top of which we plan to construct our next block.
+// Refer to godocs on GetBestMiningCandidate.
+type MiningBase struct {
+	TipSet      *types.TipSet
+	ComputeTime time.Time
+	AddRounds   abi.ChainEpoch
+}
+
+func (mb MiningBase) epoch() abi.ChainEpoch {
+	// return the epoch that will result from mining on this base
+	return mb.TipSet.Height() + mb.AddRounds + 1
+}
+
+func (mb MiningBase) baseTime() time.Time {
+	tsTime := time.Unix(int64(mb.TipSet.MinTimestamp()), 0)
+	roundDelay := build.BlockDelaySecs * uint64(mb.AddRounds+1)
+	tsTime = tsTime.Add(time.Duration(roundDelay) * time.Second)
+	return tsTime
+}
+
+func (mb MiningBase) afterPropDelay() time.Time {
+	base := mb.baseTime()
+	base.Add(randTimeOffset(time.Second))
+	return base
+}
+
+func (t *WinPostTask) mineBasic(ctx context.Context) {
+	var workBase MiningBase
+
+	taskFn := t.mineTF.Val(ctx)
+
+	// initialize workbase
+	{
+		head := retry1(func() (*types.TipSet, error) {
+			return t.api.ChainHead(ctx)
+		})
+
+		workBase = MiningBase{
+			TipSet:      head,
+			AddRounds:   0,
+			ComputeTime: time.Now(),
+		}
+	}
+
+	/*
+
+		         /- T+0 == workBase.baseTime
+		         |
+		>--------*------*--------[wait until next round]----->
+		                |
+		                |- T+PD == workBase.afterPropDelay+(~1s)
+		                |- Here we acquire the new workBase, and start a new round task
+		                \- Then we loop around, and wait for the next head
+
+		time -->
+	*/
+
+	for {
+		// limit the rate at which we mine blocks to at least EquivocationDelaySecs
+		// this is to prevent races on devnets in catch up mode. Acts as a minimum
+		// delay for the sleep below.
+		time.Sleep(time.Duration(build.EquivocationDelaySecs)*time.Second + time.Second)
+
+		// wait for *NEXT* propagation delay
+		time.Sleep(time.Until(workBase.afterPropDelay()))
+
+		// check current best candidate
+		maybeBase := retry1(func() (*types.TipSet, error) {
+			return t.api.ChainHead(ctx)
+		})
+
+		if workBase.TipSet.Equals(maybeBase) {
+			// workbase didn't change in the new round so we have a null round here
+			workBase.AddRounds++
+			log.Debugw("workbase update", "tipset", workBase.TipSet.Cids(), "nulls", workBase.AddRounds, "lastUpdate", time.Since(workBase.ComputeTime), "type", "same-tipset")
+		} else {
+			btsw := retry1(func() (types.BigInt, error) {
+				return t.api.ChainTipSetWeight(ctx, maybeBase.Key())
+			})
+
+			ltsw := retry1(func() (types.BigInt, error) {
+				return t.api.ChainTipSetWeight(ctx, workBase.TipSet.Key())
+			})
+
+			if types.BigCmp(btsw, ltsw) <= 0 {
+				// new tipset for some reason has less weight than the old one, assume null round here
+				// NOTE: the backing node may have reorged, or manually changed head
+				workBase.AddRounds++
+				log.Debugw("workbase update", "tipset", workBase.TipSet.Cids(), "nulls", workBase.AddRounds, "lastUpdate", time.Since(workBase.ComputeTime), "type", "prefer-local-weight")
+			} else {
+				// new tipset has more weight, so we should mine on it, no null round here
+				log.Debugw("workbase update", "tipset", workBase.TipSet.Cids(), "nulls", workBase.AddRounds, "lastUpdate", time.Since(workBase.ComputeTime), "type", "prefer-new-tipset")
+
+				workBase = MiningBase{
+					TipSet:      maybeBase,
+					AddRounds:   0,
+					ComputeTime: time.Now(),
+				}
+			}
+		}
+
+		// dispatch mining task
+		// (note equivocation prevention is handled by the mining code)
+
+		for _, act := range t.actors {
+			spID, err := address.IDFromAddress(address.Address(act))
+			if err != nil {
+				log.Errorf("failed to get spID from address %s: %s", act, err)
+				continue
+			}
+
+			taskFn(func(id harmonytask.TaskID, tx *harmonydb.Tx) (shouldCommit bool, seriousError error) {
+				_, err := tx.Exec(`INSERT INTO mining_tasks (task_id, sp_id, epoch, base_compute_time) VALUES ($1, $2, $3, $4)`, id, spID, workBase.epoch(), workBase.ComputeTime.UTC())
+				if err != nil {
+					return false, xerrors.Errorf("inserting mining_tasks: %w", err)
+				}
+
+				for _, c := range workBase.TipSet.Cids() {
+					_, err = tx.Exec(`INSERT INTO mining_base_block (task_id, sp_id, block_cid) VALUES ($1, $2, $3)`, id, spID, c)
+					if err != nil {
+						return false, xerrors.Errorf("inserting mining base blocks: %w", err)
+					}
+				}
+
+				return true, nil // no errors, commit the transaction
+			})
+		}
+	}
+}
+
+func (t *WinPostTask) computeTicket(ctx context.Context, maddr address.Address, brand *types.BeaconEntry, round abi.ChainEpoch, chainRand *types.Ticket, mbi *api.MiningBaseInfo) (*types.Ticket, error) {
+	buf := new(bytes.Buffer)
+	if err := maddr.MarshalCBOR(buf); err != nil {
+		return nil, xerrors.Errorf("failed to marshal address to cbor: %w", err)
+	}
+
+	if round > build.UpgradeSmokeHeight {
+		buf.Write(chainRand.VRFProof)
+	}
+
+	input, err := lrand.DrawRandomnessFromBase(brand.Data, crypto.DomainSeparationTag_TicketProduction, round-build.TicketRandomnessLookback, buf.Bytes())
+	if err != nil {
+		return nil, err
+	}
+
+	vrfOut, err := gen.ComputeVRF(ctx, t.api.WalletSign, mbi.WorkerKey, input)
+	if err != nil {
+		return nil, err
+	}
+
+	return &types.Ticket{
+		VRFProof: vrfOut,
+	}, nil
+}
+
+func randTimeOffset(width time.Duration) time.Duration {
+	buf := make([]byte, 8)
+	rand.Reader.Read(buf) //nolint:errcheck
+	val := time.Duration(binary.BigEndian.Uint64(buf) % uint64(width))
+
+	return val - (width / 2)
+}
+
+func retry1[R any](f func() (R, error)) R {
+	for {
+		r, err := f()
+		if err == nil {
+			return r
+		}
+
+		log.Errorw("error in mining loop, retrying", "error", err)
+		time.Sleep(time.Second)
+	}
+}
+
+var _ harmonytask.TaskInterface = &WinPostTask{}