diff --git a/api/api_storage.go b/api/api_storage.go
index 9662e8cd8..a9dec3d0e 100644
--- a/api/api_storage.go
+++ b/api/api_storage.go
@@ -80,6 +80,8 @@ type StorageMiner interface {
 	// SectorTerminatePending returns a list of pending sector terminations to be sent in the next batch message
 	SectorTerminatePending(ctx context.Context) ([]abi.SectorID, error)  //perm:admin
 	SectorMarkForUpgrade(ctx context.Context, id abi.SectorNumber) error //perm:admin
+	SectorCommitFlush(ctx context.Context) (*cid.Cid, error)             //perm:admin
+	SectorCommitPending(ctx context.Context) ([]abi.SectorID, error)     //perm:admin
 
 	// WorkerConnect tells the node to connect to workers RPC
 	WorkerConnect(context.Context, string) error                              //perm:admin retry:true
diff --git a/api/apistruct/struct.go b/api/apistruct/struct.go
index 21ed6d56a..6917a2967 100644
--- a/api/apistruct/struct.go
+++ b/api/apistruct/struct.go
@@ -639,6 +639,10 @@ type StorageMinerStruct struct {
 
 		SealingSchedDiag func(p0 context.Context, p1 bool) (interface{}, error) `perm:"admin"`
 
+		SectorCommitFlush func(p0 context.Context) (*cid.Cid, error) `perm:"admin"`
+
+		SectorCommitPending func(p0 context.Context) ([]abi.SectorID, error) `perm:"admin"`
+
 		SectorGetExpectedSealDuration func(p0 context.Context) (time.Duration, error) `perm:"read"`
 
 		SectorGetSealDelay func(p0 context.Context) (time.Duration, error) `perm:"read"`
@@ -1923,6 +1927,14 @@ func (s *StorageMinerStruct) SealingSchedDiag(p0 context.Context, p1 bool) (inte
 	return s.Internal.SealingSchedDiag(p0, p1)
 }
 
+func (s *StorageMinerStruct) SectorCommitFlush(p0 context.Context) (*cid.Cid, error) {
+	return s.Internal.SectorCommitFlush(p0)
+}
+
+func (s *StorageMinerStruct) SectorCommitPending(p0 context.Context) ([]abi.SectorID, error) {
+	return s.Internal.SectorCommitPending(p0)
+}
+
 func (s *StorageMinerStruct) SectorGetExpectedSealDuration(p0 context.Context) (time.Duration, error) {
 	return s.Internal.SectorGetExpectedSealDuration(p0)
 }
diff --git a/build/parameters.go b/build/parameters.go
index 7d34a7831..b70dad1c1 100644
--- a/build/parameters.go
+++ b/build/parameters.go
@@ -5,3 +5,7 @@ import rice "github.com/GeertJohan/go.rice"
 func ParametersJSON() []byte {
 	return rice.MustFindBox("proof-params").MustBytes("parameters.json")
 }
+
+func SrsJSON() []byte {
+	return rice.MustFindBox("proof-params").MustBytes("srs-inner-product.json")
+}
diff --git a/build/proof-params/srs-inner-product.json b/build/proof-params/srs-inner-product.json
new file mode 100644
index 000000000..8566bf5fd
--- /dev/null
+++ b/build/proof-params/srs-inner-product.json
@@ -0,0 +1,7 @@
+{
+  "v28-fil-inner-product-v1.srs": {
+    "cid": "Qmdq44DjcQnFfU3PJcdX7J49GCqcUYszr1TxMbHtAkvQ3g",
+    "digest": "ae20310138f5ba81451d723f858e3797",
+    "sector_size": 0
+  }
+}
diff --git a/chain/gen/gen.go b/chain/gen/gen.go
index b4e04424c..af2611676 100644
--- a/chain/gen/gen.go
+++ b/chain/gen/gen.go
@@ -25,7 +25,7 @@ import (
 	"go.opencensus.io/trace"
 	"golang.org/x/xerrors"
 
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 
 	"github.com/filecoin-project/lotus/api"
 	"github.com/filecoin-project/lotus/blockstore"
@@ -51,7 +51,7 @@ const msgsPerBlock = 20
 //nolint:deadcode,varcheck
 var log = logging.Logger("gen")
 
-var ValidWpostForTesting = []proof2.PoStProof{{
+var ValidWpostForTesting = []proof5.PoStProof{{
 	ProofBytes: []byte("valid proof"),
 }}
 
@@ -460,7 +460,7 @@ func (cg *ChainGen) NextTipSetFromMinersWithMessages(base *types.TipSet, miners
 
 func (cg *ChainGen) makeBlock(parents *types.TipSet, m address.Address, vrfticket *types.Ticket,
 	eticket *types.ElectionProof, bvals []types.BeaconEntry, height abi.ChainEpoch,
-	wpost []proof2.PoStProof, msgs []*types.SignedMessage) (*types.FullBlock, error) {
+	wpost []proof5.PoStProof, msgs []*types.SignedMessage) (*types.FullBlock, error) {
 
 	var ts uint64
 	if cg.Timestamper != nil {
@@ -598,7 +598,7 @@ func (mca mca) WalletSign(ctx context.Context, a address.Address, v []byte) (*cr
 
 type WinningPoStProver interface {
 	GenerateCandidates(context.Context, abi.PoStRandomness, uint64) ([]uint64, error)
-	ComputeProof(context.Context, []proof2.SectorInfo, abi.PoStRandomness) ([]proof2.PoStProof, error)
+	ComputeProof(context.Context, []proof5.SectorInfo, abi.PoStRandomness) ([]proof5.PoStProof, error)
 }
 
 type wppProvider struct{}
@@ -607,7 +607,7 @@ func (wpp *wppProvider) GenerateCandidates(ctx context.Context, _ abi.PoStRandom
 	return []uint64{0}, nil
 }
 
-func (wpp *wppProvider) ComputeProof(context.Context, []proof2.SectorInfo, abi.PoStRandomness) ([]proof2.PoStProof, error) {
+func (wpp *wppProvider) ComputeProof(context.Context, []proof5.SectorInfo, abi.PoStRandomness) ([]proof5.PoStProof, error) {
 	return ValidWpostForTesting, nil
 }
 
@@ -685,15 +685,23 @@ type genFakeVerifier struct{}
 
 var _ ffiwrapper.Verifier = (*genFakeVerifier)(nil)
 
-func (m genFakeVerifier) VerifySeal(svi proof2.SealVerifyInfo) (bool, error) {
+func (m genFakeVerifier) VerifySeal(svi proof5.SealVerifyInfo) (bool, error) {
 	return true, nil
 }
 
-func (m genFakeVerifier) VerifyWinningPoSt(ctx context.Context, info proof2.WinningPoStVerifyInfo) (bool, error) {
+func (m genFakeVerifier) VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) (bool, error) {
 	panic("not supported")
 }
 
-func (m genFakeVerifier) VerifyWindowPoSt(ctx context.Context, info proof2.WindowPoStVerifyInfo) (bool, error) {
+func (m genFakeVerifier) AggregateSealProofs(proofType abi.RegisteredSealProof, proofs [][]byte) ([]byte, error) {
+	panic("not supported")
+}
+
+func (m genFakeVerifier) VerifyWinningPoSt(ctx context.Context, info proof5.WinningPoStVerifyInfo) (bool, error) {
+	panic("not supported")
+}
+
+func (m genFakeVerifier) VerifyWindowPoSt(ctx context.Context, info proof5.WindowPoStVerifyInfo) (bool, error) {
 	panic("not supported")
 }
 
diff --git a/chain/gen/genesis/miners.go b/chain/gen/genesis/miners.go
index 297543886..be33560e5 100644
--- a/chain/gen/genesis/miners.go
+++ b/chain/gen/genesis/miners.go
@@ -27,7 +27,7 @@ import (
 	miner0 "github.com/filecoin-project/specs-actors/actors/builtin/miner"
 	power0 "github.com/filecoin-project/specs-actors/actors/builtin/power"
 	reward0 "github.com/filecoin-project/specs-actors/actors/builtin/reward"
-	runtime2 "github.com/filecoin-project/specs-actors/v2/actors/runtime"
+	runtime5 "github.com/filecoin-project/specs-actors/v5/actors/runtime"
 
 	"github.com/filecoin-project/lotus/chain/state"
 	"github.com/filecoin-project/lotus/chain/store"
@@ -46,7 +46,7 @@ func MinerAddress(genesisIndex uint64) address.Address {
 }
 
 type fakedSigSyscalls struct {
-	runtime2.Syscalls
+	runtime5.Syscalls
 }
 
 func (fss *fakedSigSyscalls) VerifySignature(signature crypto.Signature, signer address.Address, plaintext []byte) error {
@@ -54,7 +54,7 @@ func (fss *fakedSigSyscalls) VerifySignature(signature crypto.Signature, signer
 }
 
 func mkFakedSigSyscalls(base vm.SyscallBuilder) vm.SyscallBuilder {
-	return func(ctx context.Context, rt *vm.Runtime) runtime2.Syscalls {
+	return func(ctx context.Context, rt *vm.Runtime) runtime5.Syscalls {
 		return &fakedSigSyscalls{
 			base(ctx, rt),
 		}
diff --git a/chain/vm/gas.go b/chain/vm/gas.go
index eef431aef..5ecc42345 100644
--- a/chain/vm/gas.go
+++ b/chain/vm/gas.go
@@ -9,8 +9,8 @@ import (
 	addr "github.com/filecoin-project/go-address"
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/crypto"
-	vmr2 "github.com/filecoin-project/specs-actors/v2/actors/runtime"
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	vmr5 "github.com/filecoin-project/specs-actors/v5/actors/runtime"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 	"github.com/ipfs/go-cid"
 )
 
@@ -74,8 +74,9 @@ type Pricelist interface {
 	OnVerifySignature(sigType crypto.SigType, planTextSize int) (GasCharge, error)
 	OnHashing(dataSize int) GasCharge
 	OnComputeUnsealedSectorCid(proofType abi.RegisteredSealProof, pieces []abi.PieceInfo) GasCharge
-	OnVerifySeal(info proof2.SealVerifyInfo) GasCharge
-	OnVerifyPost(info proof2.WindowPoStVerifyInfo) GasCharge
+	OnVerifySeal(info proof5.SealVerifyInfo) GasCharge
+	OnVerifyAggregateSeals() GasCharge
+	OnVerifyPost(info proof5.WindowPoStVerifyInfo) GasCharge
 	OnVerifyConsensusFault() GasCharge
 }
 
@@ -111,6 +112,7 @@ var prices = map[abi.ChainEpoch]Pricelist{
 		hashingBase:                  31355,
 		computeUnsealedSectorCidBase: 98647,
 		verifySealBase:               2000, // TODO gas , it VerifySeal syscall is not used
+		verifyAggregateSealBase:      0,
 		verifyPostLookup: map[abi.RegisteredPoStProof]scalingCost{
 			abi.RegisteredPoStProof_StackedDrgWindow512MiBV1: {
 				flat:  123861062,
@@ -158,7 +160,8 @@ var prices = map[abi.ChainEpoch]Pricelist{
 
 		hashingBase:                  31355,
 		computeUnsealedSectorCidBase: 98647,
-		verifySealBase:               2000, // TODO gas , it VerifySeal syscall is not used
+		verifySealBase:               2000,        // TODO gas , it VerifySeal syscall is not used
+		verifyAggregateSealBase:      400_000_000, // TODO (~40ms, I think)
 		verifyPostLookup: map[abi.RegisteredPoStProof]scalingCost{
 			abi.RegisteredPoStProof_StackedDrgWindow512MiBV1: {
 				flat:  117680921,
@@ -198,7 +201,7 @@ func PricelistByEpoch(epoch abi.ChainEpoch) Pricelist {
 }
 
 type pricedSyscalls struct {
-	under     vmr2.Syscalls
+	under     vmr5.Syscalls
 	pl        Pricelist
 	chargeGas func(GasCharge)
 }
@@ -232,7 +235,7 @@ func (ps pricedSyscalls) ComputeUnsealedSectorCID(reg abi.RegisteredSealProof, p
 }
 
 // Verifies a sector seal proof.
-func (ps pricedSyscalls) VerifySeal(vi proof2.SealVerifyInfo) error {
+func (ps pricedSyscalls) VerifySeal(vi proof5.SealVerifyInfo) error {
 	ps.chargeGas(ps.pl.OnVerifySeal(vi))
 	defer ps.chargeGas(gasOnActorExec)
 
@@ -240,7 +243,7 @@ func (ps pricedSyscalls) VerifySeal(vi proof2.SealVerifyInfo) error {
 }
 
 // Verifies a proof of spacetime.
-func (ps pricedSyscalls) VerifyPoSt(vi proof2.WindowPoStVerifyInfo) error {
+func (ps pricedSyscalls) VerifyPoSt(vi proof5.WindowPoStVerifyInfo) error {
 	ps.chargeGas(ps.pl.OnVerifyPost(vi))
 	defer ps.chargeGas(gasOnActorExec)
 
@@ -257,14 +260,14 @@ func (ps pricedSyscalls) VerifyPoSt(vi proof2.WindowPoStVerifyInfo) error {
 // the "parent grinding fault", in which case it must be the sibling of h1 (same parent tipset) and one of the
 // blocks in the parent of h2 (i.e. h2's grandparent).
 // Returns nil and an error if the headers don't prove a fault.
-func (ps pricedSyscalls) VerifyConsensusFault(h1 []byte, h2 []byte, extra []byte) (*vmr2.ConsensusFault, error) {
+func (ps pricedSyscalls) VerifyConsensusFault(h1 []byte, h2 []byte, extra []byte) (*vmr5.ConsensusFault, error) {
 	ps.chargeGas(ps.pl.OnVerifyConsensusFault())
 	defer ps.chargeGas(gasOnActorExec)
 
 	return ps.under.VerifyConsensusFault(h1, h2, extra)
 }
 
-func (ps pricedSyscalls) BatchVerifySeals(inp map[address.Address][]proof2.SealVerifyInfo) (map[address.Address][]bool, error) {
+func (ps pricedSyscalls) BatchVerifySeals(inp map[address.Address][]proof5.SealVerifyInfo) (map[address.Address][]bool, error) {
 	count := int64(0)
 	for _, svis := range inp {
 		count += int64(len(svis))
@@ -277,3 +280,10 @@ func (ps pricedSyscalls) BatchVerifySeals(inp map[address.Address][]proof2.SealV
 
 	return ps.under.BatchVerifySeals(inp)
 }
+
+func (ps pricedSyscalls) VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) error {
+	ps.chargeGas(ps.pl.OnVerifyAggregateSeals())
+	defer ps.chargeGas(gasOnActorExec)
+
+	return ps.under.VerifyAggregateSeals(aggregate)
+}
diff --git a/chain/vm/gas_v0.go b/chain/vm/gas_v0.go
index 7c864b7f9..d54760b69 100644
--- a/chain/vm/gas_v0.go
+++ b/chain/vm/gas_v0.go
@@ -91,6 +91,7 @@ type pricelistV0 struct {
 
 	computeUnsealedSectorCidBase int64
 	verifySealBase               int64
+	verifyAggregateSealBase      int64
 	verifyPostLookup             map[abi.RegisteredPoStProof]scalingCost
 	verifyPostDiscount           bool
 	verifyConsensusFault         int64
@@ -185,6 +186,12 @@ func (pl *pricelistV0) OnVerifySeal(info proof2.SealVerifyInfo) GasCharge {
 	return newGasCharge("OnVerifySeal", pl.verifySealBase, 0)
 }
 
+// OnVerifyAggregateSeals
+func (pl *pricelistV0) OnVerifyAggregateSeals() GasCharge {
+	// TODO: this needs more cost tunning
+	return newGasCharge("OnVerifyAggregateSeals", pl.verifyAggregateSealBase, 0)
+}
+
 // OnVerifyPost
 func (pl *pricelistV0) OnVerifyPost(info proof2.WindowPoStVerifyInfo) GasCharge {
 	sectorSize := "unknown"
diff --git a/chain/vm/invoker.go b/chain/vm/invoker.go
index 126b57090..4a8032770 100644
--- a/chain/vm/invoker.go
+++ b/chain/vm/invoker.go
@@ -16,10 +16,10 @@ import (
 
 	exported0 "github.com/filecoin-project/specs-actors/actors/builtin/exported"
 	exported2 "github.com/filecoin-project/specs-actors/v2/actors/builtin/exported"
-	vmr "github.com/filecoin-project/specs-actors/v2/actors/runtime"
 	exported3 "github.com/filecoin-project/specs-actors/v3/actors/builtin/exported"
 	exported4 "github.com/filecoin-project/specs-actors/v4/actors/builtin/exported"
 	exported5 "github.com/filecoin-project/specs-actors/v5/actors/builtin/exported"
+	vmr "github.com/filecoin-project/specs-actors/v5/actors/runtime"
 
 	"github.com/filecoin-project/go-state-types/abi"
 	"github.com/filecoin-project/go-state-types/exitcode"
diff --git a/chain/vm/runtime.go b/chain/vm/runtime.go
index cdb1720de..a3e2f293f 100644
--- a/chain/vm/runtime.go
+++ b/chain/vm/runtime.go
@@ -16,7 +16,7 @@ import (
 	"github.com/filecoin-project/go-state-types/network"
 	rtt "github.com/filecoin-project/go-state-types/rt"
 	rt0 "github.com/filecoin-project/specs-actors/actors/runtime"
-	rt2 "github.com/filecoin-project/specs-actors/v2/actors/runtime"
+	rt5 "github.com/filecoin-project/specs-actors/v5/actors/runtime"
 	"github.com/ipfs/go-cid"
 	ipldcbor "github.com/ipfs/go-ipld-cbor"
 	"go.opencensus.io/trace"
@@ -54,8 +54,8 @@ func (m *Message) ValueReceived() abi.TokenAmount {
 var EnableGasTracing = false
 
 type Runtime struct {
-	rt2.Message
-	rt2.Syscalls
+	rt5.Message
+	rt5.Syscalls
 
 	ctx context.Context
 
@@ -136,7 +136,7 @@ func (rt *Runtime) StorePut(x cbor.Marshaler) cid.Cid {
 }
 
 var _ rt0.Runtime = (*Runtime)(nil)
-var _ rt2.Runtime = (*Runtime)(nil)
+var _ rt5.Runtime = (*Runtime)(nil)
 
 func (rt *Runtime) shimCall(f func() interface{}) (rval []byte, aerr aerrors.ActorError) {
 	defer func() {
diff --git a/chain/vm/syscalls.go b/chain/vm/syscalls.go
index 0bcfe10a7..568197bc8 100644
--- a/chain/vm/syscalls.go
+++ b/chain/vm/syscalls.go
@@ -26,8 +26,8 @@ import (
 	"github.com/filecoin-project/lotus/extern/sector-storage/ffiwrapper"
 	"github.com/filecoin-project/lotus/lib/sigs"
 
-	runtime2 "github.com/filecoin-project/specs-actors/v2/actors/runtime"
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	runtime5 "github.com/filecoin-project/specs-actors/v5/actors/runtime"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 )
 
 func init() {
@@ -36,10 +36,10 @@ func init() {
 
 // Actual type is defined in chain/types/vmcontext.go because the VMContext interface is there
 
-type SyscallBuilder func(ctx context.Context, rt *Runtime) runtime2.Syscalls
+type SyscallBuilder func(ctx context.Context, rt *Runtime) runtime5.Syscalls
 
 func Syscalls(verifier ffiwrapper.Verifier) SyscallBuilder {
-	return func(ctx context.Context, rt *Runtime) runtime2.Syscalls {
+	return func(ctx context.Context, rt *Runtime) runtime5.Syscalls {
 
 		return &syscallShim{
 			ctx:            ctx,
@@ -90,7 +90,7 @@ func (ss *syscallShim) HashBlake2b(data []byte) [32]byte {
 // Checks validity of the submitted consensus fault with the two block headers needed to prove the fault
 // and an optional extra one to check common ancestry (as needed).
 // Note that the blocks are ordered: the method requires a.Epoch() <= b.Epoch().
-func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime2.ConsensusFault, error) {
+func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime5.ConsensusFault, error) {
 	// Note that block syntax is not validated. Any validly signed block will be accepted pursuant to the below conditions.
 	// Whether or not it could ever have been accepted in a chain is not checked/does not matter here.
 	// for that reason when checking block parent relationships, rather than instantiating a Tipset to do so
@@ -133,14 +133,14 @@ func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime2.Conse
 	}
 
 	// (2) check for the consensus faults themselves
-	var consensusFault *runtime2.ConsensusFault
+	var consensusFault *runtime5.ConsensusFault
 
 	// (a) double-fork mining fault
 	if blockA.Height == blockB.Height {
-		consensusFault = &runtime2.ConsensusFault{
+		consensusFault = &runtime5.ConsensusFault{
 			Target: blockA.Miner,
 			Epoch:  blockB.Height,
-			Type:   runtime2.ConsensusFaultDoubleForkMining,
+			Type:   runtime5.ConsensusFaultDoubleForkMining,
 		}
 	}
 
@@ -148,10 +148,10 @@ func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime2.Conse
 	// strictly speaking no need to compare heights based on double fork mining check above,
 	// but at same height this would be a different fault.
 	if types.CidArrsEqual(blockA.Parents, blockB.Parents) && blockA.Height != blockB.Height {
-		consensusFault = &runtime2.ConsensusFault{
+		consensusFault = &runtime5.ConsensusFault{
 			Target: blockA.Miner,
 			Epoch:  blockB.Height,
-			Type:   runtime2.ConsensusFaultTimeOffsetMining,
+			Type:   runtime5.ConsensusFaultTimeOffsetMining,
 		}
 	}
 
@@ -171,10 +171,10 @@ func (ss *syscallShim) VerifyConsensusFault(a, b, extra []byte) (*runtime2.Conse
 
 		if types.CidArrsEqual(blockA.Parents, blockC.Parents) && blockA.Height == blockC.Height &&
 			types.CidArrsContains(blockB.Parents, blockC.Cid()) && !types.CidArrsContains(blockB.Parents, blockA.Cid()) {
-			consensusFault = &runtime2.ConsensusFault{
+			consensusFault = &runtime5.ConsensusFault{
 				Target: blockA.Miner,
 				Epoch:  blockB.Height,
-				Type:   runtime2.ConsensusFaultParentGrinding,
+				Type:   runtime5.ConsensusFaultParentGrinding,
 			}
 		}
 	}
@@ -243,7 +243,7 @@ func (ss *syscallShim) workerKeyAtLookback(height abi.ChainEpoch) (address.Addre
 	return ResolveToKeyAddr(ss.cstate, ss.cst, info.Worker)
 }
 
-func (ss *syscallShim) VerifyPoSt(proof proof2.WindowPoStVerifyInfo) error {
+func (ss *syscallShim) VerifyPoSt(proof proof5.WindowPoStVerifyInfo) error {
 	ok, err := ss.verifier.VerifyWindowPoSt(context.TODO(), proof)
 	if err != nil {
 		return err
@@ -254,7 +254,7 @@ func (ss *syscallShim) VerifyPoSt(proof proof2.WindowPoStVerifyInfo) error {
 	return nil
 }
 
-func (ss *syscallShim) VerifySeal(info proof2.SealVerifyInfo) error {
+func (ss *syscallShim) VerifySeal(info proof5.SealVerifyInfo) error {
 	//_, span := trace.StartSpan(ctx, "ValidatePoRep")
 	//defer span.End()
 
@@ -281,6 +281,18 @@ func (ss *syscallShim) VerifySeal(info proof2.SealVerifyInfo) error {
 	return nil
 }
 
+func (ss *syscallShim) VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) error {
+	ok, err := ss.verifier.VerifyAggregateSeals(aggregate)
+	if err != nil {
+		return xerrors.Errorf("failed to verify aggregated PoRep: %w", err)
+	}
+	if !ok {
+		return fmt.Errorf("invalid aggredate proof")
+	}
+
+	return nil
+}
+
 func (ss *syscallShim) VerifySignature(sig crypto.Signature, addr address.Address, input []byte) error {
 	// TODO: in genesis setup, we are currently faking signatures
 
@@ -294,7 +306,7 @@ func (ss *syscallShim) VerifySignature(sig crypto.Signature, addr address.Addres
 
 var BatchSealVerifyParallelism = goruntime.NumCPU()
 
-func (ss *syscallShim) BatchVerifySeals(inp map[address.Address][]proof2.SealVerifyInfo) (map[address.Address][]bool, error) {
+func (ss *syscallShim) BatchVerifySeals(inp map[address.Address][]proof5.SealVerifyInfo) (map[address.Address][]bool, error) {
 	out := make(map[address.Address][]bool)
 
 	sema := make(chan struct{}, BatchSealVerifyParallelism)
@@ -306,7 +318,7 @@ func (ss *syscallShim) BatchVerifySeals(inp map[address.Address][]proof2.SealVer
 
 		for i, s := range seals {
 			wg.Add(1)
-			go func(ma address.Address, ix int, svi proof2.SealVerifyInfo, res []bool) {
+			go func(ma address.Address, ix int, svi proof5.SealVerifyInfo, res []bool) {
 				defer wg.Done()
 				sema <- struct{}{}
 
diff --git a/cli/params.go b/cli/params.go
index 8419507b8..1aa6555c5 100644
--- a/cli/params.go
+++ b/cli/params.go
@@ -23,7 +23,7 @@ var FetchParamCmd = &cli.Command{
 		}
 		sectorSize := uint64(sectorSizeInt)
 
-		err = paramfetch.GetParams(ReqContext(cctx), build.ParametersJSON(), sectorSize)
+		err = paramfetch.GetParams(ReqContext(cctx), build.ParametersJSON(), build.SrsJSON(), sectorSize)
 		if err != nil {
 			return xerrors.Errorf("fetching proof parameters: %w", err)
 		}
diff --git a/cmd/lotus-bench/main.go b/cmd/lotus-bench/main.go
index 81aa09a75..0b8ec6fe3 100644
--- a/cmd/lotus-bench/main.go
+++ b/cmd/lotus-bench/main.go
@@ -243,7 +243,7 @@ var sealBenchCmd = &cli.Command{
 		// Only fetch parameters if actually needed
 		skipc2 := c.Bool("skip-commit2")
 		if !skipc2 {
-			if err := paramfetch.GetParams(lcli.ReqContext(c), build.ParametersJSON(), uint64(sectorSize)); err != nil {
+			if err := paramfetch.GetParams(lcli.ReqContext(c), build.ParametersJSON(), build.SrsJSON(), uint64(sectorSize)); err != nil {
 				return xerrors.Errorf("getting params: %w", err)
 			}
 		}
@@ -738,7 +738,7 @@ var proveCmd = &cli.Command{
 			return xerrors.Errorf("unmarshalling input file: %w", err)
 		}
 
-		if err := paramfetch.GetParams(lcli.ReqContext(c), build.ParametersJSON(), c2in.SectorSize); err != nil {
+		if err := paramfetch.GetParams(lcli.ReqContext(c), build.ParametersJSON(), build.SrsJSON(), c2in.SectorSize); err != nil {
 			return xerrors.Errorf("getting params: %w", err)
 		}
 
diff --git a/cmd/lotus-seal-worker/main.go b/cmd/lotus-seal-worker/main.go
index 24918e52a..5a78c6dac 100644
--- a/cmd/lotus-seal-worker/main.go
+++ b/cmd/lotus-seal-worker/main.go
@@ -228,7 +228,7 @@ var runCmd = &cli.Command{
 		}
 
 		if cctx.Bool("commit") {
-			if err := paramfetch.GetParams(ctx, build.ParametersJSON(), uint64(ssize)); err != nil {
+			if err := paramfetch.GetParams(ctx, build.ParametersJSON(), build.SrsJSON(), uint64(ssize)); err != nil {
 				return xerrors.Errorf("get params: %w", err)
 			}
 		}
diff --git a/cmd/lotus-shed/params.go b/cmd/lotus-shed/params.go
index 3f7e7b6fb..e45d9489c 100644
--- a/cmd/lotus-shed/params.go
+++ b/cmd/lotus-shed/params.go
@@ -25,7 +25,7 @@ var fetchParamCmd = &cli.Command{
 			return err
 		}
 		sectorSize := uint64(sectorSizeInt)
-		err = paramfetch.GetParams(lcli.ReqContext(cctx), build.ParametersJSON(), sectorSize)
+		err = paramfetch.GetParams(lcli.ReqContext(cctx), build.ParametersJSON(), build.SrsJSON(), sectorSize)
 		if err != nil {
 			return xerrors.Errorf("fetching proof parameters: %w", err)
 		}
diff --git a/cmd/lotus-storage-miner/info.go b/cmd/lotus-storage-miner/info.go
index 7650de035..7a8835fee 100644
--- a/cmd/lotus-storage-miner/info.go
+++ b/cmd/lotus-storage-miner/info.go
@@ -295,6 +295,8 @@ var stateList = []stateMeta{
 	{col: color.FgYellow, state: sealing.Committing},
 	{col: color.FgYellow, state: sealing.SubmitCommit},
 	{col: color.FgYellow, state: sealing.CommitWait},
+	{col: color.FgYellow, state: sealing.SubmitCommitAggregate},
+	{col: color.FgYellow, state: sealing.CommitAggregateWait},
 	{col: color.FgYellow, state: sealing.FinalizeSector},
 
 	{col: color.FgCyan, state: sealing.Terminating},
diff --git a/cmd/lotus-storage-miner/init.go b/cmd/lotus-storage-miner/init.go
index 2e38dcc06..bac8444cc 100644
--- a/cmd/lotus-storage-miner/init.go
+++ b/cmd/lotus-storage-miner/init.go
@@ -143,7 +143,7 @@ var initCmd = &cli.Command{
 
 		log.Info("Checking proof parameters")
 
-		if err := paramfetch.GetParams(ctx, build.ParametersJSON(), uint64(ssize)); err != nil {
+		if err := paramfetch.GetParams(ctx, build.ParametersJSON(), build.SrsJSON(), uint64(ssize)); err != nil {
 			return xerrors.Errorf("fetching proof parameters: %w", err)
 		}
 
diff --git a/cmd/lotus-storage-miner/init_restore.go b/cmd/lotus-storage-miner/init_restore.go
index 12358e63a..af4c43c95 100644
--- a/cmd/lotus-storage-miner/init_restore.go
+++ b/cmd/lotus-storage-miner/init_restore.go
@@ -249,7 +249,7 @@ var initRestoreCmd = &cli.Command{
 
 		log.Info("Checking proof parameters")
 
-		if err := paramfetch.GetParams(ctx, build.ParametersJSON(), uint64(mi.SectorSize)); err != nil {
+		if err := paramfetch.GetParams(ctx, build.ParametersJSON(), build.SrsJSON(), uint64(mi.SectorSize)); err != nil {
 			return xerrors.Errorf("fetching proof parameters: %w", err)
 		}
 
diff --git a/cmd/lotus-storage-miner/sectors.go b/cmd/lotus-storage-miner/sectors.go
index 3791dbf07..8da491841 100644
--- a/cmd/lotus-storage-miner/sectors.go
+++ b/cmd/lotus-storage-miner/sectors.go
@@ -45,6 +45,7 @@ var sectorsCmd = &cli.Command{
 		sectorsStartSealCmd,
 		sectorsSealDelayCmd,
 		sectorsCapacityCollateralCmd,
+		sectorsPendingCommit,
 	},
 }
 
@@ -969,6 +970,53 @@ var sectorsUpdateCmd = &cli.Command{
 	},
 }
 
+var sectorsPendingCommit = &cli.Command{
+	Name:  "pending-commit",
+	Usage: "list sectors waiting in batch queue",
+	Flags: []cli.Flag{
+		&cli.BoolFlag{
+			Name:  "publish-now",
+			Usage: "send a batch now",
+		},
+	},
+	Action: func(cctx *cli.Context) error {
+		api, closer, err := lcli.GetStorageMinerAPI(cctx)
+		if err != nil {
+			return err
+		}
+		defer closer()
+		ctx := lcli.ReqContext(cctx)
+
+		if cctx.Bool("publish-now") {
+			cid, err := api.SectorCommitFlush(ctx)
+			if err != nil {
+				return xerrors.Errorf("flush: %w", err)
+			}
+			if cid == nil {
+				return xerrors.Errorf("no sectors to publish")
+			}
+
+			fmt.Println("sector batch published: ", cid)
+			return nil
+		}
+
+		pending, err := api.SectorCommitPending(ctx)
+		if err != nil {
+			return xerrors.Errorf("getting pending deals: %w", err)
+		}
+
+		if len(pending) > 0 {
+			for _, sector := range pending {
+				fmt.Println(sector.Number)
+			}
+			return nil
+		}
+
+		fmt.Println("No sectors queued to be committed")
+		return nil
+	},
+}
+
 func yesno(b bool) string {
 	if b {
 		return color.GreenString("YES")
diff --git a/cmd/lotus/daemon.go b/cmd/lotus/daemon.go
index 5a59ec816..644892ee2 100644
--- a/cmd/lotus/daemon.go
+++ b/cmd/lotus/daemon.go
@@ -231,7 +231,7 @@ var DaemonCmd = &cli.Command{
 		freshRepo := err != repo.ErrRepoExists
 
 		if !isLite {
-			if err := paramfetch.GetParams(lcli.ReqContext(cctx), build.ParametersJSON(), 0); err != nil {
+			if err := paramfetch.GetParams(lcli.ReqContext(cctx), build.ParametersJSON(), build.SrsJSON(), 0); err != nil {
 				return xerrors.Errorf("fetching proof parameters: %w", err)
 			}
 		}
diff --git a/documentation/en/api-methods-miner.md b/documentation/en/api-methods-miner.md
index d140d7d85..5ebc44be5 100644
--- a/documentation/en/api-methods-miner.md
+++ b/documentation/en/api-methods-miner.md
@@ -98,6 +98,8 @@
   * [SealingAbort](#SealingAbort)
   * [SealingSchedDiag](#SealingSchedDiag)
 * [Sector](#Sector)
+  * [SectorCommitFlush](#SectorCommitFlush)
+  * [SectorCommitPending](#SectorCommitPending)
   * [SectorGetExpectedSealDuration](#SectorGetExpectedSealDuration)
   * [SectorGetSealDelay](#SectorGetSealDelay)
   * [SectorMarkForUpgrade](#SectorMarkForUpgrade)
@@ -1556,6 +1558,24 @@ Response: `{}`
 ## Sector
 
 
+### SectorCommitFlush
+
+
+Perms: admin
+
+Inputs: `null`
+
+Response: `null`
+
+### SectorCommitPending
+
+
+Perms: admin
+
+Inputs: `null`
+
+Response: `null`
+
 ### SectorGetExpectedSealDuration
 SectorGetExpectedSealDuration gets the expected time for a sector to seal
 
diff --git a/extern/filecoin-ffi b/extern/filecoin-ffi
index dc4e4e8dc..5f9f082b0 160000
--- a/extern/filecoin-ffi
+++ b/extern/filecoin-ffi
@@ -1 +1 @@
-Subproject commit dc4e4e8dc9554dedb6f48304f7f0c6328331f9ec
+Subproject commit 5f9f082b03a22bbf0f31adcb2bdf7f539cee6b6b
diff --git a/extern/sector-storage/ffiwrapper/sealer_test.go b/extern/sector-storage/ffiwrapper/sealer_test.go
index 2efcfc6a0..5af6a78e7 100644
--- a/extern/sector-storage/ffiwrapper/sealer_test.go
+++ b/extern/sector-storage/ffiwrapper/sealer_test.go
@@ -18,6 +18,7 @@ import (
 	commpffi "github.com/filecoin-project/go-commp-utils/ffiwrapper"
 
 	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 
 	"github.com/ipfs/go-cid"
 
@@ -83,9 +84,10 @@ func (s *seal) precommit(t *testing.T, sb *Sealer, id storage.SectorRef, done fu
 	s.cids = cids
 }
 
-func (s *seal) commit(t *testing.T, sb *Sealer, done func()) {
+var seed = abi.InteractiveSealRandomness{0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 45, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9}
+
+func (s *seal) commit(t *testing.T, sb *Sealer, done func()) storage.Proof {
 	defer done()
-	seed := abi.InteractiveSealRandomness{0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9, 8, 7, 6, 45, 3, 2, 1, 0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9}
 
 	pc1, err := sb.SealCommit1(context.TODO(), s.ref, s.ticket, seed, []abi.PieceInfo{s.pi}, s.cids)
 	if err != nil {
@@ -112,6 +114,8 @@ func (s *seal) commit(t *testing.T, sb *Sealer, done func()) {
 	if !ok {
 		t.Fatal("proof failed to validate")
 	}
+
+	return proof
 }
 
 func (s *seal) unseal(t *testing.T, sb *Sealer, sp *basicfs.Provider, si storage.SectorRef, done func()) {
@@ -229,7 +233,12 @@ func getGrothParamFileAndVerifyingKeys(s abi.SectorSize) {
 		panic(err)
 	}
 
-	err = paramfetch.GetParams(context.TODO(), dat, uint64(s))
+	datSrs, err := ioutil.ReadFile("../../../build/proof-params/srs-inner-product.json")
+	if err != nil {
+		panic(err)
+	}
+
+	err = paramfetch.GetParams(context.TODO(), dat, datSrs, uint64(s))
 	if err != nil {
 		panic(xerrors.Errorf("failed to acquire Groth parameters for 2KiB sectors: %w", err))
 	}
@@ -462,6 +471,94 @@ func TestSealAndVerify3(t *testing.T) {
 	post(t, sb, []abi.SectorID{si1.ID, si2.ID}, s1, s2, s3)
 }
 
+func TestSealAndVerifyAggregate(t *testing.T) {
+	numAgg := 5
+
+	if testing.Short() {
+		t.Skip("skipping test in short mode")
+	}
+
+	defer requireFDsClosed(t, openFDs(t))
+
+	if runtime.NumCPU() < 10 && os.Getenv("CI") == "" { // don't bother on slow hardware
+		t.Skip("this is slow")
+	}
+	_ = os.Setenv("RUST_LOG", "info")
+
+	getGrothParamFileAndVerifyingKeys(sectorSize)
+
+	cdir, err := ioutil.TempDir("", "sbtest-c-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	miner := abi.ActorID(123)
+
+	sp := &basicfs.Provider{
+		Root: cdir,
+	}
+	sb, err := New(sp)
+	if err != nil {
+		t.Fatalf("%+v", err)
+	}
+	cleanup := func() {
+		if t.Failed() {
+			fmt.Printf("not removing %s\n", cdir)
+			return
+		}
+		if err := os.RemoveAll(cdir); err != nil {
+			t.Error(err)
+		}
+	}
+	defer cleanup()
+
+	avi := proof5.AggregateSealVerifyProofAndInfos{
+		Miner: miner,
+		Infos: make([]proof5.AggregateSealVerifyInfo, numAgg),
+	}
+
+	toAggregate := make([][]byte, numAgg)
+	for i := 0; i < numAgg; i++ {
+		si := storage.SectorRef{
+			ID:        abi.SectorID{Miner: miner, Number: abi.SectorNumber(i + 1)},
+			ProofType: sealProofType,
+		}
+
+		s := seal{ref: si}
+		s.precommit(t, sb, si, func() {})
+		toAggregate[i] = s.commit(t, sb, func() {})
+
+		avi.Infos[i] = proof5.AggregateSealVerifyInfo{
+			Number:                abi.SectorNumber(i + 1),
+			Randomness:            s.ticket,
+			InteractiveRandomness: seed,
+			SealedCID:             s.cids.Sealed,
+			UnsealedCID:           s.cids.Unsealed,
+		}
+	}
+
+	aggStart := time.Now()
+
+	avi.Proof, err = ProofVerifier.AggregateSealProofs(sealProofType, toAggregate)
+	require.NoError(t, err)
+
+	aggDone := time.Now()
+
+	_, err = ProofVerifier.AggregateSealProofs(sealProofType, toAggregate)
+	require.NoError(t, err)
+
+	aggHot := time.Now()
+
+	ok, err := ProofVerifier.VerifyAggregateSeals(avi)
+	require.NoError(t, err)
+	require.True(t, ok)
+
+	verifDone := time.Now()
+
+	fmt.Printf("Aggregate: %s\n", aggDone.Sub(aggStart).String())
+	fmt.Printf("Hot: %s\n", aggHot.Sub(aggDone).String())
+	fmt.Printf("Verify: %s\n", verifDone.Sub(aggHot).String())
+}
+
 func BenchmarkWriteWithAlignment(b *testing.B) {
 	bt := abi.UnpaddedPieceSize(2 * 127 * 1024 * 1024)
 	b.SetBytes(int64(bt))
diff --git a/extern/sector-storage/ffiwrapper/types.go b/extern/sector-storage/ffiwrapper/types.go
index b7e96636a..9c84794bf 100644
--- a/extern/sector-storage/ffiwrapper/types.go
+++ b/extern/sector-storage/ffiwrapper/types.go
@@ -4,7 +4,7 @@ import (
 	"context"
 	"io"
 
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 
 	"github.com/ipfs/go-cid"
 
@@ -34,11 +34,15 @@ type Storage interface {
 }
 
 type Verifier interface {
-	VerifySeal(proof2.SealVerifyInfo) (bool, error)
-	VerifyWinningPoSt(ctx context.Context, info proof2.WinningPoStVerifyInfo) (bool, error)
-	VerifyWindowPoSt(ctx context.Context, info proof2.WindowPoStVerifyInfo) (bool, error)
+	VerifySeal(proof5.SealVerifyInfo) (bool, error)
+	VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) (bool, error)
+	VerifyWinningPoSt(ctx context.Context, info proof5.WinningPoStVerifyInfo) (bool, error)
+	VerifyWindowPoSt(ctx context.Context, info proof5.WindowPoStVerifyInfo) (bool, error)
 
 	GenerateWinningPoStSectorChallenge(context.Context, abi.RegisteredPoStProof, abi.ActorID, abi.PoStRandomness, uint64) ([]uint64, error)
+
+	// cheap, makes no sense to put this on the storage interface
+	AggregateSealProofs(proofType abi.RegisteredSealProof, proofs [][]byte) ([]byte, error)
 }
 
 type SectorProvider interface {
diff --git a/extern/sector-storage/ffiwrapper/verifier_cgo.go b/extern/sector-storage/ffiwrapper/verifier_cgo.go
index 15e0e6ab3..b31903080 100644
--- a/extern/sector-storage/ffiwrapper/verifier_cgo.go
+++ b/extern/sector-storage/ffiwrapper/verifier_cgo.go
@@ -10,13 +10,13 @@ import (
 
 	ffi "github.com/filecoin-project/filecoin-ffi"
 	"github.com/filecoin-project/go-state-types/abi"
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 	"github.com/filecoin-project/specs-storage/storage"
 
 	"github.com/filecoin-project/lotus/extern/sector-storage/storiface"
 )
 
-func (sb *Sealer) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, error) {
+func (sb *Sealer) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof5.SectorInfo, randomness abi.PoStRandomness) ([]proof5.PoStProof, error) {
 	randomness[31] &= 0x3f
 	privsectors, skipped, done, err := sb.pubSectorToPriv(ctx, minerID, sectorInfo, nil, abi.RegisteredSealProof.RegisteredWinningPoStProof) // TODO: FAULTS?
 	if err != nil {
@@ -30,7 +30,7 @@ func (sb *Sealer) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID,
 	return ffi.GenerateWinningPoSt(minerID, privsectors, randomness)
 }
 
-func (sb *Sealer) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, []abi.SectorID, error) {
+func (sb *Sealer) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof5.SectorInfo, randomness abi.PoStRandomness) ([]proof5.PoStProof, []abi.SectorID, error) {
 	randomness[31] &= 0x3f
 	privsectors, skipped, done, err := sb.pubSectorToPriv(ctx, minerID, sectorInfo, nil, abi.RegisteredSealProof.RegisteredWindowPoStProof)
 	if err != nil {
@@ -55,7 +55,7 @@ func (sb *Sealer) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, s
 	return proof, faultyIDs, err
 }
 
-func (sb *Sealer) pubSectorToPriv(ctx context.Context, mid abi.ActorID, sectorInfo []proof2.SectorInfo, faults []abi.SectorNumber, rpt func(abi.RegisteredSealProof) (abi.RegisteredPoStProof, error)) (ffi.SortedPrivateSectorInfo, []abi.SectorID, func(), error) {
+func (sb *Sealer) pubSectorToPriv(ctx context.Context, mid abi.ActorID, sectorInfo []proof5.SectorInfo, faults []abi.SectorNumber, rpt func(abi.RegisteredSealProof) (abi.RegisteredPoStProof, error)) (ffi.SortedPrivateSectorInfo, []abi.SectorID, func(), error) {
 	fmap := map[abi.SectorNumber]struct{}{}
 	for _, fault := range faults {
 		fmap[fault] = struct{}{}
@@ -111,11 +111,15 @@ type proofVerifier struct{}
 
 var ProofVerifier = proofVerifier{}
 
-func (proofVerifier) VerifySeal(info proof2.SealVerifyInfo) (bool, error) {
+func (proofVerifier) VerifySeal(info proof5.SealVerifyInfo) (bool, error) {
 	return ffi.VerifySeal(info)
 }
 
-func (proofVerifier) VerifyWinningPoSt(ctx context.Context, info proof2.WinningPoStVerifyInfo) (bool, error) {
+func (proofVerifier) VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) (bool, error) {
+	return ffi.VerifyAggregateSeals(aggregate)
+}
+
+func (proofVerifier) VerifyWinningPoSt(ctx context.Context, info proof5.WinningPoStVerifyInfo) (bool, error) {
 	info.Randomness[31] &= 0x3f
 	_, span := trace.StartSpan(ctx, "VerifyWinningPoSt")
 	defer span.End()
@@ -123,7 +127,7 @@ func (proofVerifier) VerifyWinningPoSt(ctx context.Context, info proof2.WinningP
 	return ffi.VerifyWinningPoSt(info)
 }
 
-func (proofVerifier) VerifyWindowPoSt(ctx context.Context, info proof2.WindowPoStVerifyInfo) (bool, error) {
+func (proofVerifier) VerifyWindowPoSt(ctx context.Context, info proof5.WindowPoStVerifyInfo) (bool, error) {
 	info.Randomness[31] &= 0x3f
 	_, span := trace.StartSpan(ctx, "VerifyWindowPoSt")
 	defer span.End()
@@ -135,3 +139,7 @@ func (proofVerifier) GenerateWinningPoStSectorChallenge(ctx context.Context, pro
 	randomness[31] &= 0x3f
 	return ffi.GenerateWinningPoStSectorChallenge(proofType, minerID, randomness, eligibleSectorCount)
 }
+
+func (v proofVerifier) AggregateSealProofs(proofType abi.RegisteredSealProof, proofs [][]byte) ([]byte, error) {
+	return ffi.AggregateSealProofs(proofType, proofs)
+}
diff --git a/extern/sector-storage/mock/mock.go b/extern/sector-storage/mock/mock.go
index ae7d54985..ec6020010 100644
--- a/extern/sector-storage/mock/mock.go
+++ b/extern/sector-storage/mock/mock.go
@@ -9,7 +9,7 @@ import (
 	"math/rand"
 	"sync"
 
-	proof2 "github.com/filecoin-project/specs-actors/v2/actors/runtime/proof"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 
 	ffiwrapper2 "github.com/filecoin-project/go-commp-utils/ffiwrapper"
 	commcid "github.com/filecoin-project/go-fil-commcid"
@@ -300,14 +300,14 @@ func AddOpFinish(ctx context.Context) (context.Context, func()) {
 	}
 }
 
-func (mgr *SectorMgr) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, error) {
+func (mgr *SectorMgr) GenerateWinningPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof5.SectorInfo, randomness abi.PoStRandomness) ([]proof5.PoStProof, error) {
 	mgr.lk.Lock()
 	defer mgr.lk.Unlock()
 
 	return generateFakePoSt(sectorInfo, abi.RegisteredSealProof.RegisteredWinningPoStProof, randomness), nil
 }
 
-func (mgr *SectorMgr) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) ([]proof2.PoStProof, []abi.SectorID, error) {
+func (mgr *SectorMgr) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorID, sectorInfo []proof5.SectorInfo, randomness abi.PoStRandomness) ([]proof5.PoStProof, []abi.SectorID, error) {
 	mgr.lk.Lock()
 	defer mgr.lk.Unlock()
 
@@ -315,7 +315,8 @@ func (mgr *SectorMgr) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorI
 		return nil, nil, xerrors.Errorf("failed to post (mock)")
 	}
 
-	si := make([]proof2.SectorInfo, 0, len(sectorInfo))
+	si := make([]proof5.SectorInfo, 0, len(sectorInfo))
+
 	var skipped []abi.SectorID
 
 	var err error
@@ -343,7 +344,7 @@ func (mgr *SectorMgr) GenerateWindowPoSt(ctx context.Context, minerID abi.ActorI
 	return generateFakePoSt(si, abi.RegisteredSealProof.RegisteredWindowPoStProof, randomness), skipped, nil
 }
 
-func generateFakePoStProof(sectorInfo []proof2.SectorInfo, randomness abi.PoStRandomness) []byte {
+func generateFakePoStProof(sectorInfo []proof5.SectorInfo, randomness abi.PoStRandomness) []byte {
 	randomness[31] &= 0x3f
 
 	hasher := sha256.New()
@@ -358,13 +359,13 @@ func generateFakePoStProof(sectorInfo []proof2.SectorInfo, randomness abi.PoStRa
 
 }
 
-func generateFakePoSt(sectorInfo []proof2.SectorInfo, rpt func(abi.RegisteredSealProof) (abi.RegisteredPoStProof, error), randomness abi.PoStRandomness) []proof2.PoStProof {
+func generateFakePoSt(sectorInfo []proof5.SectorInfo, rpt func(abi.RegisteredSealProof) (abi.RegisteredPoStProof, error), randomness abi.PoStRandomness) []proof5.PoStProof {
 	wp, err := rpt(sectorInfo[0].SealProof)
 	if err != nil {
 		panic(err)
 	}
 
-	return []proof2.PoStProof{
+	return []proof5.PoStProof{
 		{
 			PoStProof:  wp,
 			ProofBytes: generateFakePoStProof(sectorInfo, randomness),
@@ -489,7 +490,7 @@ func (mgr *SectorMgr) ReturnFetch(ctx context.Context, callID storiface.CallID,
 	panic("not supported")
 }
 
-func (m mockVerif) VerifySeal(svi proof2.SealVerifyInfo) (bool, error) {
+func (m mockVerif) VerifySeal(svi proof5.SealVerifyInfo) (bool, error) {
 	plen, err := svi.SealProof.ProofSize()
 	if err != nil {
 		return false, err
@@ -501,6 +502,7 @@ func (m mockVerif) VerifySeal(svi proof2.SealVerifyInfo) (bool, error) {
 
 	// only the first 32 bytes, the rest are 0.
 	for i, b := range svi.Proof[:32] {
+		// unsealed+sealed-seed*ticket
 		if b != svi.UnsealedCID.Bytes()[i]+svi.SealedCID.Bytes()[31-i]-svi.InteractiveRandomness[i]*svi.Randomness[i] {
 			return false, nil
 		}
@@ -509,12 +511,35 @@ func (m mockVerif) VerifySeal(svi proof2.SealVerifyInfo) (bool, error) {
 	return true, nil
 }
 
-func (m mockVerif) VerifyWinningPoSt(ctx context.Context, info proof2.WinningPoStVerifyInfo) (bool, error) {
+func (m mockVerif) VerifyAggregateSeals(aggregate proof5.AggregateSealVerifyProofAndInfos) (bool, error) {
+	out := make([]byte, 200)
+	for pi, svi := range aggregate.Infos {
+		for i := 0; i < 32; i++ {
+			b := svi.UnsealedCID.Bytes()[i] + svi.SealedCID.Bytes()[31-i] - svi.InteractiveRandomness[i]*svi.Randomness[i] // raw proof byte
+			b *= uint8(pi)                                                                                                 // with aggregate index
+			out[i] += b
+		}
+	}
+
+	return bytes.Equal(aggregate.Proof, out), nil
+}
+
+func (m mockVerif) AggregateSealProofs(proofType abi.RegisteredSealProof, proofs [][]byte) ([]byte, error) {
+	out := make([]byte, 200) // todo: figure out more real length
+	for pi, proof := range proofs {
+		for i := range proof[:32] {
+			out[i] += proof[i] * uint8(pi)
+		}
+	}
+	return out, nil
+}
+
+func (m mockVerif) VerifyWinningPoSt(ctx context.Context, info proof5.WinningPoStVerifyInfo) (bool, error) {
 	info.Randomness[31] &= 0x3f
 	return true, nil
 }
 
-func (m mockVerif) VerifyWindowPoSt(ctx context.Context, info proof2.WindowPoStVerifyInfo) (bool, error) {
+func (m mockVerif) VerifyWindowPoSt(ctx context.Context, info proof5.WindowPoStVerifyInfo) (bool, error) {
 	if len(info.Proofs) != 1 {
 		return false, xerrors.Errorf("expected 1 proof entry")
 	}
diff --git a/extern/storage-sealing/commit_batch.go b/extern/storage-sealing/commit_batch.go
new file mode 100644
index 000000000..74f163010
--- /dev/null
+++ b/extern/storage-sealing/commit_batch.go
@@ -0,0 +1,271 @@
+package sealing
+
+import (
+	"bytes"
+	"context"
+	"sort"
+	"sync"
+	"time"
+
+	"github.com/ipfs/go-cid"
+	"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/big"
+	miner5 "github.com/filecoin-project/specs-actors/v5/actors/builtin/miner"
+	proof5 "github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
+
+	"github.com/filecoin-project/lotus/api"
+	"github.com/filecoin-project/lotus/chain/actors/builtin/miner"
+	"github.com/filecoin-project/lotus/extern/sector-storage/ffiwrapper"
+)
+
+var (
+	// TODO: config!
+
+	CommitBatchWait = 5 * time.Minute
+)
+
+type CommitBatcherApi interface {
+	SendMsg(ctx context.Context, from, to address.Address, method abi.MethodNum, value, maxFee abi.TokenAmount, params []byte) (cid.Cid, error)
+	StateMinerInfo(context.Context, address.Address, TipSetToken) (miner.MinerInfo, error)
+}
+
+type AggregateInput struct {
+	// TODO: Something changed in actors, I think this now needs to be AggregateSealVerifyProofAndInfos
+	info  proof5.AggregateSealVerifyInfo
+	proof []byte
+}
+
+type CommitBatcher struct {
+	api       CommitBatcherApi
+	maddr     address.Address
+	mctx      context.Context
+	addrSel   AddrSel
+	feeCfg    FeeConfig
+	getConfig GetSealingConfigFunc
+	verif     ffiwrapper.Verifier
+
+	todo    map[abi.SectorNumber]AggregateInput
+	waiting map[abi.SectorNumber][]chan cid.Cid
+
+	notify, stop, stopped chan struct{}
+	force                 chan chan *cid.Cid
+	lk                    sync.Mutex
+}
+
+func NewCommitBatcher(mctx context.Context, maddr address.Address, api CommitBatcherApi, addrSel AddrSel, feeCfg FeeConfig, getConfig GetSealingConfigFunc, verif ffiwrapper.Verifier) *CommitBatcher {
+	b := &CommitBatcher{
+		api:       api,
+		maddr:     maddr,
+		mctx:      mctx,
+		addrSel:   addrSel,
+		feeCfg:    feeCfg,
+		getConfig: getConfig,
+		verif:     verif,
+
+		todo:    map[abi.SectorNumber]AggregateInput{},
+		waiting: map[abi.SectorNumber][]chan cid.Cid{},
+
+		notify:  make(chan struct{}, 1),
+		force:   make(chan chan *cid.Cid),
+		stop:    make(chan struct{}),
+		stopped: make(chan struct{}),
+	}
+
+	go b.run()
+
+	return b
+}
+
+func (b *CommitBatcher) run() {
+	var forceRes chan *cid.Cid
+	var lastMsg *cid.Cid
+
+	for {
+		if forceRes != nil {
+			forceRes <- lastMsg
+			forceRes = nil
+		}
+		lastMsg = nil
+
+		var sendAboveMax, sendAboveMin bool
+		select {
+		case <-b.stop:
+			close(b.stopped)
+			return
+		case <-b.notify:
+			sendAboveMax = true
+		case <-time.After(TerminateBatchWait):
+			sendAboveMin = true
+		case fr := <-b.force: // user triggered
+			forceRes = fr
+		}
+
+		var err error
+		lastMsg, err = b.processBatch(sendAboveMax, sendAboveMin)
+		if err != nil {
+			log.Warnw("TerminateBatcher processBatch error", "error", err)
+		}
+	}
+}
+
+func (b *CommitBatcher) processBatch(notif, after bool) (*cid.Cid, error) {
+	b.lk.Lock()
+	defer b.lk.Unlock()
+	params := miner5.ProveCommitAggregateParams{
+		SectorNumbers: bitfield.New(),
+	}
+
+	total := len(b.todo)
+	if total == 0 {
+		return nil, nil // nothing to do
+	}
+
+	cfg, err := b.getConfig()
+	if err != nil {
+		return nil, xerrors.Errorf("getting config: %w", err)
+	}
+
+	if notif && total < cfg.MaxCommitBatch {
+		return nil, nil
+	}
+
+	if after && total < cfg.MinCommitBatch {
+		return nil, nil
+	}
+
+	spt := b.todo[0].info.SealProof
+	proofs := make([][]byte, total)
+
+	for id, p := range b.todo {
+		if p.info.SealProof != spt {
+			// todo: handle when we'll have proof upgrade
+			return nil, xerrors.Errorf("different seal proof types in commit batch: %w", err)
+		}
+
+		params.SectorNumbers.Set(uint64(id))
+		proofs[id] = p.proof
+	}
+
+	params.AggregateProof, err = b.verif.AggregateSealProofs(spt, proofs)
+	if err != nil {
+		return nil, xerrors.Errorf("aggregating proofs: %w", err)
+	}
+
+	enc := new(bytes.Buffer)
+	if err := params.MarshalCBOR(enc); err != nil {
+		return nil, xerrors.Errorf("couldn't serialize TerminateSectors params: %w", err)
+	}
+
+	mi, err := b.api.StateMinerInfo(b.mctx, b.maddr, nil)
+	if err != nil {
+		return nil, xerrors.Errorf("couldn't get miner info: %w", err)
+	}
+
+	from, _, err := b.addrSel(b.mctx, mi, api.CommitAddr, b.feeCfg.MaxCommitGasFee, b.feeCfg.MaxCommitGasFee)
+	if err != nil {
+		return nil, xerrors.Errorf("no good address found: %w", err)
+	}
+
+	mcid, err := b.api.SendMsg(b.mctx, from, b.maddr, miner.Methods.ProveCommitAggregate, big.Zero(), b.feeCfg.MaxCommitGasFee, enc.Bytes())
+	if err != nil {
+		return nil, xerrors.Errorf("sending message failed: %w", err)
+	}
+
+	log.Infow("Sent ProveCommitAggregate message", "cid", mcid, "from", from, "sectors", total)
+
+	err = params.SectorNumbers.ForEach(func(us uint64) error {
+		sn := abi.SectorNumber(us)
+
+		for _, ch := range b.waiting[sn] {
+			ch <- mcid // buffered
+		}
+		delete(b.waiting, sn)
+		delete(b.todo, sn)
+		return nil
+	})
+	if err != nil {
+		return nil, xerrors.Errorf("done sectors foreach: %w", err)
+	}
+
+	return &mcid, nil
+}
+
+// register commit, wait for batch message, return message CID
+func (b *CommitBatcher) AddCommit(ctx context.Context, s abi.SectorNumber, in AggregateInput) (mcid cid.Cid, err error) {
+	b.lk.Lock()
+	b.todo[s] = in
+
+	sent := make(chan cid.Cid, 1)
+	b.waiting[s] = append(b.waiting[s], sent)
+
+	select {
+	case b.notify <- struct{}{}:
+	default: // already have a pending notification, don't need more
+	}
+	b.lk.Unlock()
+
+	select {
+	case c := <-sent:
+		return c, nil
+	case <-ctx.Done():
+		return cid.Undef, ctx.Err()
+	}
+}
+
+func (b *CommitBatcher) Flush(ctx context.Context) (*cid.Cid, error) {
+	resCh := make(chan *cid.Cid, 1)
+	select {
+	case b.force <- resCh:
+		select {
+		case res := <-resCh:
+			return res, nil
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	}
+}
+
+func (b *CommitBatcher) Pending(ctx context.Context) ([]abi.SectorID, error) {
+	b.lk.Lock()
+	defer b.lk.Unlock()
+
+	mid, err := address.IDFromAddress(b.maddr)
+	if err != nil {
+		return nil, err
+	}
+
+	res := make([]abi.SectorID, 0)
+	for _, s := range b.todo {
+		res = append(res, abi.SectorID{
+			Miner:  abi.ActorID(mid),
+			Number: s.info.Number,
+		})
+	}
+
+	sort.Slice(res, func(i, j int) bool {
+		if res[i].Miner != res[j].Miner {
+			return res[i].Miner < res[j].Miner
+		}
+
+		return res[i].Number < res[j].Number
+	})
+
+	return res, nil
+}
+
+func (b *CommitBatcher) Stop(ctx context.Context) error {
+	close(b.stop)
+
+	select {
+	case <-b.stopped:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}
diff --git a/extern/storage-sealing/fsm.go b/extern/storage-sealing/fsm.go
index d14d363e5..367938099 100644
--- a/extern/storage-sealing/fsm.go
+++ b/extern/storage-sealing/fsm.go
@@ -91,12 +91,22 @@ var fsmPlanners = map[SectorState]func(events []statemachine.Event, state *Secto
 	SubmitCommit: planOne(
 		on(SectorCommitSubmitted{}, CommitWait),
 		on(SectorCommitFailed{}, CommitFailed),
+		on(SectorSubmitCommitAggregate{}, SubmitCommitAggregate),
+	),
+	SubmitCommitAggregate: planOne(
+		on(SectorCommitAggregateSent{}, CommitWait),
+		on(SectorCommitFailed{}, CommitFailed),
 	),
 	CommitWait: planOne(
 		on(SectorProving{}, FinalizeSector),
 		on(SectorCommitFailed{}, CommitFailed),
 		on(SectorRetrySubmitCommit{}, SubmitCommit),
 	),
+	CommitAggregateWait: planOne(
+		on(SectorProving{}, FinalizeSector),
+		on(SectorCommitFailed{}, CommitFailed),
+		on(SectorRetrySubmitCommit{}, SubmitCommit),
+	),
 
 	FinalizeSector: planOne(
 		on(SectorFinalized{}, Proving),
@@ -338,8 +348,12 @@ func (m *Sealing) plan(events []statemachine.Event, state *SectorInfo) (func(sta
 		return m.handleCommitting, processed, nil
 	case SubmitCommit:
 		return m.handleSubmitCommit, processed, nil
+	case CommitAggregateWait:
+		fallthrough
 	case CommitWait:
 		return m.handleCommitWait, processed, nil
+	case SubmitCommitAggregate:
+		return m.handleSubmitCommitAggregate, processed, nil
 	case FinalizeSector:
 		return m.handleFinalizeSector, processed, nil
 
diff --git a/extern/storage-sealing/fsm_events.go b/extern/storage-sealing/fsm_events.go
index 8d11b248b..bced1921f 100644
--- a/extern/storage-sealing/fsm_events.go
+++ b/extern/storage-sealing/fsm_events.go
@@ -233,6 +233,10 @@ func (evt SectorCommitted) apply(state *SectorInfo) {
 	state.Proof = evt.Proof
 }
 
+type SectorSubmitCommitAggregate struct{}
+
+func (evt SectorSubmitCommitAggregate) apply(*SectorInfo) {}
+
 type SectorCommitSubmitted struct {
 	Message cid.Cid
 }
@@ -241,6 +245,14 @@ func (evt SectorCommitSubmitted) apply(state *SectorInfo) {
 	state.CommitMessage = &evt.Message
 }
 
+type SectorCommitAggregateSent struct {
+	Message cid.Cid
+}
+
+func (evt SectorCommitAggregateSent) apply(state *SectorInfo) {
+	state.CommitMessage = &evt.Message
+}
+
 type SectorProving struct{}
 
 func (evt SectorProving) apply(*SectorInfo) {}
diff --git a/extern/storage-sealing/sealiface/config.go b/extern/storage-sealing/sealiface/config.go
index 7ac5f6160..f62911b70 100644
--- a/extern/storage-sealing/sealiface/config.go
+++ b/extern/storage-sealing/sealiface/config.go
@@ -17,4 +17,8 @@ type Config struct {
 	WaitDealsDelay time.Duration
 
 	AlwaysKeepUnsealedCopy bool
+
+	AggregateCommits bool
+	MinCommitBatch   int
+	MaxCommitBatch   int
 }
diff --git a/extern/storage-sealing/sealing.go b/extern/storage-sealing/sealing.go
index 8feca3b7b..d990cb02f 100644
--- a/extern/storage-sealing/sealing.go
+++ b/extern/storage-sealing/sealing.go
@@ -103,6 +103,7 @@ type Sealing struct {
 	stats SectorStats
 
 	terminator *TerminateBatcher
+	commiter   *CommitBatcher
 
 	getConfig GetSealingConfigFunc
 	dealInfo  *CurrentDealInfoManager
@@ -152,6 +153,7 @@ func New(api SealingAPI, fc FeeConfig, events Events, maddr address.Address, ds
 		addrSel: as,
 
 		terminator: NewTerminationBatcher(context.TODO(), maddr, api, as, fc),
+		commiter:   NewCommitBatcher(context.TODO(), maddr, api, as, fc, gc, verif),
 
 		getConfig: gc,
 		dealInfo:  &CurrentDealInfoManager{api},
@@ -202,6 +204,14 @@ func (m *Sealing) TerminatePending(ctx context.Context) ([]abi.SectorID, error)
 	return m.terminator.Pending(ctx)
 }
 
+func (m *Sealing) CommitFlush(ctx context.Context) (*cid.Cid, error) {
+	return m.commiter.Flush(ctx)
+}
+
+func (m *Sealing) CommitPending(ctx context.Context) ([]abi.SectorID, error) {
+	return m.commiter.Pending(ctx)
+}
+
 func (m *Sealing) currentSealProof(ctx context.Context) (abi.RegisteredSealProof, error) {
 	mi, err := m.api.StateMinerInfo(ctx, m.maddr, nil)
 	if err != nil {
diff --git a/extern/storage-sealing/sector_state.go b/extern/storage-sealing/sector_state.go
index b636614d1..b6b7cbf7b 100644
--- a/extern/storage-sealing/sector_state.go
+++ b/extern/storage-sealing/sector_state.go
@@ -3,61 +3,69 @@ package sealing
 type SectorState string
 
 var ExistSectorStateList = map[SectorState]struct{}{
-	Empty:                {},
-	WaitDeals:            {},
-	Packing:              {},
-	AddPiece:             {},
-	AddPieceFailed:       {},
-	GetTicket:            {},
-	PreCommit1:           {},
-	PreCommit2:           {},
-	PreCommitting:        {},
-	PreCommitWait:        {},
-	WaitSeed:             {},
-	Committing:           {},
-	SubmitCommit:         {},
-	CommitWait:           {},
-	FinalizeSector:       {},
-	Proving:              {},
-	FailedUnrecoverable:  {},
-	SealPreCommit1Failed: {},
-	SealPreCommit2Failed: {},
-	PreCommitFailed:      {},
-	ComputeProofFailed:   {},
-	CommitFailed:         {},
-	PackingFailed:        {},
-	FinalizeFailed:       {},
-	DealsExpired:         {},
-	RecoverDealIDs:       {},
-	Faulty:               {},
-	FaultReported:        {},
-	FaultedFinal:         {},
-	Terminating:          {},
-	TerminateWait:        {},
-	TerminateFinality:    {},
-	TerminateFailed:      {},
-	Removing:             {},
-	RemoveFailed:         {},
-	Removed:              {},
+	Empty:                 {},
+	WaitDeals:             {},
+	Packing:               {},
+	AddPiece:              {},
+	AddPieceFailed:        {},
+	GetTicket:             {},
+	PreCommit1:            {},
+	PreCommit2:            {},
+	PreCommitting:         {},
+	PreCommitWait:         {},
+	WaitSeed:              {},
+	Committing:            {},
+	SubmitCommit:          {},
+	CommitWait:            {},
+	SubmitCommitAggregate: {},
+	CommitAggregateWait:   {},
+	FinalizeSector:        {},
+	Proving:               {},
+	FailedUnrecoverable:   {},
+	SealPreCommit1Failed:  {},
+	SealPreCommit2Failed:  {},
+	PreCommitFailed:       {},
+	ComputeProofFailed:    {},
+	CommitFailed:          {},
+	PackingFailed:         {},
+	FinalizeFailed:        {},
+	DealsExpired:          {},
+	RecoverDealIDs:        {},
+	Faulty:                {},
+	FaultReported:         {},
+	FaultedFinal:          {},
+	Terminating:           {},
+	TerminateWait:         {},
+	TerminateFinality:     {},
+	TerminateFailed:       {},
+	Removing:              {},
+	RemoveFailed:          {},
+	Removed:               {},
 }
 
 const (
 	UndefinedSectorState SectorState = ""
 
 	// happy path
-	Empty          SectorState = "Empty"         // deprecated
-	WaitDeals      SectorState = "WaitDeals"     // waiting for more pieces (deals) to be added to the sector
-	AddPiece       SectorState = "AddPiece"      // put deal data (and padding if required) into the sector
-	Packing        SectorState = "Packing"       // sector not in sealStore, and not on chain
-	GetTicket      SectorState = "GetTicket"     // generate ticket
-	PreCommit1     SectorState = "PreCommit1"    // do PreCommit1
-	PreCommit2     SectorState = "PreCommit2"    // do PreCommit2
-	PreCommitting  SectorState = "PreCommitting" // on chain pre-commit
-	PreCommitWait  SectorState = "PreCommitWait" // waiting for precommit to land on chain
-	WaitSeed       SectorState = "WaitSeed"      // waiting for seed
-	Committing     SectorState = "Committing"    // compute PoRep
-	SubmitCommit   SectorState = "SubmitCommit"  // send commit message to the chain
-	CommitWait     SectorState = "CommitWait"    // wait for the commit message to land on chain
+	Empty         SectorState = "Empty"         // deprecated
+	WaitDeals     SectorState = "WaitDeals"     // waiting for more pieces (deals) to be added to the sector
+	AddPiece      SectorState = "AddPiece"      // put deal data (and padding if required) into the sector
+	Packing       SectorState = "Packing"       // sector not in sealStore, and not on chain
+	GetTicket     SectorState = "GetTicket"     // generate ticket
+	PreCommit1    SectorState = "PreCommit1"    // do PreCommit1
+	PreCommit2    SectorState = "PreCommit2"    // do PreCommit2
+	PreCommitting SectorState = "PreCommitting" // on chain pre-commit
+	PreCommitWait SectorState = "PreCommitWait" // waiting for precommit to land on chain
+	WaitSeed      SectorState = "WaitSeed"      // waiting for seed
+	Committing    SectorState = "Committing"    // compute PoRep
+
+	// single commit
+	SubmitCommit SectorState = "SubmitCommit" // send commit message to the chain
+	CommitWait   SectorState = "CommitWait"   // wait for the commit message to land on chain
+
+	SubmitCommitAggregate SectorState = "SubmitCommitAggregate"
+	CommitAggregateWait   SectorState = "CommitAggregateWait"
+
 	FinalizeSector SectorState = "FinalizeSector"
 	Proving        SectorState = "Proving"
 	// error modes
@@ -91,7 +99,7 @@ func toStatState(st SectorState) statSectorState {
 	switch st {
 	case UndefinedSectorState, Empty, WaitDeals, AddPiece:
 		return sstStaging
-	case Packing, GetTicket, PreCommit1, PreCommit2, PreCommitting, PreCommitWait, WaitSeed, Committing, SubmitCommit, CommitWait, FinalizeSector:
+	case Packing, GetTicket, PreCommit1, PreCommit2, PreCommitting, PreCommitWait, WaitSeed, Committing, SubmitCommit, CommitWait, SubmitCommitAggregate, CommitAggregateWait, FinalizeSector:
 		return sstSealing
 	case Proving, Removed, Removing, Terminating, TerminateWait, TerminateFinality, TerminateFailed:
 		return sstProving
diff --git a/extern/storage-sealing/states_sealing.go b/extern/storage-sealing/states_sealing.go
index e371ab33f..296d92b9c 100644
--- a/extern/storage-sealing/states_sealing.go
+++ b/extern/storage-sealing/states_sealing.go
@@ -12,6 +12,7 @@ import (
 	"github.com/filecoin-project/go-state-types/crypto"
 	"github.com/filecoin-project/go-state-types/exitcode"
 	"github.com/filecoin-project/go-statemachine"
+	"github.com/filecoin-project/specs-actors/v5/actors/runtime/proof"
 	"github.com/filecoin-project/specs-storage/storage"
 
 	"github.com/filecoin-project/lotus/api"
@@ -452,6 +453,14 @@ func (m *Sealing) handleCommitting(ctx statemachine.Context, sector SectorInfo)
 }
 
 func (m *Sealing) handleSubmitCommit(ctx statemachine.Context, sector SectorInfo) error {
+	cfg, err := m.getConfig()
+	if err != nil {
+		return xerrors.Errorf("getting config: %w", err)
+	}
+	if cfg.AggregateCommits {
+		return ctx.Send(SectorSubmitCommitAggregate{})
+	}
+
 	tok, _, err := m.api.ChainHead(ctx.Context())
 	if err != nil {
 		log.Errorf("handleCommitting: api error, not proceeding: %+v", err)
@@ -514,6 +523,29 @@ func (m *Sealing) handleSubmitCommit(ctx statemachine.Context, sector SectorInfo
 	})
 }
 
+func (m *Sealing) handleSubmitCommitAggregate(ctx statemachine.Context, sector SectorInfo) error {
+	if sector.CommD == nil || sector.CommR == nil {
+		return ctx.Send(SectorCommitFailed{xerrors.Errorf("sector had nil commR or commD")})
+	}
+
+	mcid, err := m.commiter.AddCommit(ctx.Context(), sector.SectorNumber, AggregateInput{
+		info: proof.AggregateSealVerifyInfo{
+			Number:                sector.SectorNumber,
+			DealIDs:               sector.dealIDs(),
+			Randomness:            sector.TicketValue,
+			InteractiveRandomness: sector.SeedValue,
+			SealedCID:             *sector.CommR,
+			UnsealedCID:           *sector.CommD,
+		},
+		proof: sector.Proof, // todo: this correct??
+	})
+	if err != nil {
+		return ctx.Send(SectorCommitFailed{xerrors.Errorf("queuing commit for aggregation failed: %w", err)})
+	}
+
+	return ctx.Send(SectorCommitAggregateSent{mcid})
+}
+
 func (m *Sealing) handleCommitWait(ctx statemachine.Context, sector SectorInfo) error {
 	if sector.CommitMessage == nil {
 		log.Errorf("sector %d entered commit wait state without a message cid", sector.SectorNumber)
diff --git a/go.mod b/go.mod
index af2ee9c3e..4eb8e0844 100644
--- a/go.mod
+++ b/go.mod
@@ -38,7 +38,7 @@ require (
 	github.com/filecoin-project/go-jsonrpc v0.1.4-0.20210217175800-45ea43ac2bec
 	github.com/filecoin-project/go-multistore v0.0.3
 	github.com/filecoin-project/go-padreader v0.0.0-20200903213702-ed5fae088b20
-	github.com/filecoin-project/go-paramfetch v0.0.2-0.20200701152213-3e0f0afdc261
+	github.com/filecoin-project/go-paramfetch v0.0.2-0.20210330140417-936748d3f5ec
 	github.com/filecoin-project/go-state-types v0.1.1-0.20210506134452-99b279731c48
 	github.com/filecoin-project/go-statemachine v0.0.0-20200925024713-05bd7c71fbfe
 	github.com/filecoin-project/go-statestore v0.1.1
@@ -47,7 +47,7 @@ require (
 	github.com/filecoin-project/specs-actors/v2 v2.3.5-0.20210114162132-5b58b773f4fb
 	github.com/filecoin-project/specs-actors/v3 v3.1.0
 	github.com/filecoin-project/specs-actors/v4 v4.0.0
-	github.com/filecoin-project/specs-actors/v5 v5.0.0-20210510162709-3255bdd9f2bb
+	github.com/filecoin-project/specs-actors/v5 v5.0.0-20210512015452-4fe3889fff57
 	github.com/filecoin-project/specs-storage v0.1.1-0.20201105051918-5188d9774506
 	github.com/filecoin-project/test-vectors/schema v0.0.5
 	github.com/gbrlsnchs/jwt/v3 v3.0.0-beta.1
diff --git a/go.sum b/go.sum
index ecdab7a65..a84e2e471 100644
--- a/go.sum
+++ b/go.sum
@@ -287,8 +287,8 @@ github.com/filecoin-project/go-multistore v0.0.3 h1:vaRBY4YiA2UZFPK57RNuewypB8u0
 github.com/filecoin-project/go-multistore v0.0.3/go.mod h1:kaNqCC4IhU4B1uyr7YWFHd23TL4KM32aChS0jNkyUvQ=
 github.com/filecoin-project/go-padreader v0.0.0-20200903213702-ed5fae088b20 h1:+/4aUeUoKr6AKfPE3mBhXA5spIV6UcKdTYDPNU2Tdmg=
 github.com/filecoin-project/go-padreader v0.0.0-20200903213702-ed5fae088b20/go.mod h1:mPn+LRRd5gEKNAtc+r3ScpW2JRU/pj4NBKdADYWHiak=
-github.com/filecoin-project/go-paramfetch v0.0.2-0.20200701152213-3e0f0afdc261 h1:A256QonvzRaknIIAuWhe/M2dpV2otzs3NBhi5TWa/UA=
-github.com/filecoin-project/go-paramfetch v0.0.2-0.20200701152213-3e0f0afdc261/go.mod h1:fZzmf4tftbwf9S37XRifoJlz7nCjRdIrMGLR07dKLCc=
+github.com/filecoin-project/go-paramfetch v0.0.2-0.20210330140417-936748d3f5ec h1:gExwWUiT1TcARkxGneS4nvp9C+wBsKU0bFdg7qFpNco=
+github.com/filecoin-project/go-paramfetch v0.0.2-0.20210330140417-936748d3f5ec/go.mod h1:fZzmf4tftbwf9S37XRifoJlz7nCjRdIrMGLR07dKLCc=
 github.com/filecoin-project/go-state-types v0.0.0-20200903145444-247639ffa6ad/go.mod h1:IQ0MBPnonv35CJHtWSN3YY1Hz2gkPru1Q9qoaYLxx9I=
 github.com/filecoin-project/go-state-types v0.0.0-20200904021452-1883f36ca2f4/go.mod h1:IQ0MBPnonv35CJHtWSN3YY1Hz2gkPru1Q9qoaYLxx9I=
 github.com/filecoin-project/go-state-types v0.0.0-20200928172055-2df22083d8ab/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
@@ -310,14 +310,16 @@ github.com/filecoin-project/specs-actors v0.9.13 h1:rUEOQouefi9fuVY/2HOroROJlZbO
 github.com/filecoin-project/specs-actors v0.9.13/go.mod h1:TS1AW/7LbG+615j4NsjMK1qlpAwaFsG9w0V2tg2gSao=
 github.com/filecoin-project/specs-actors/v2 v2.0.1/go.mod h1:v2NZVYinNIKA9acEMBm5wWXxqv5+frFEbekBFemYghY=
 github.com/filecoin-project/specs-actors/v2 v2.3.2/go.mod h1:UuJQLoTx/HPvvWeqlIFmC/ywlOLHNe8SNQ3OunFbu2Y=
+github.com/filecoin-project/specs-actors/v2 v2.3.4/go.mod h1:UuJQLoTx/HPvvWeqlIFmC/ywlOLHNe8SNQ3OunFbu2Y=
 github.com/filecoin-project/specs-actors/v2 v2.3.5-0.20210114162132-5b58b773f4fb h1:orr/sMzrDZUPAveRE+paBdu1kScIUO5zm+HYeh+VlhA=
 github.com/filecoin-project/specs-actors/v2 v2.3.5-0.20210114162132-5b58b773f4fb/go.mod h1:LljnY2Mn2homxZsmokJZCpRuhOPxfXhvcek5gWkmqAc=
+github.com/filecoin-project/specs-actors/v3 v3.0.4-0.20210227000520-b3317b86f4d1/go.mod h1:oMcmEed6B7H/wHabM3RQphTIhq0ibAKsbpYs+bQ/uxQ=
 github.com/filecoin-project/specs-actors/v3 v3.1.0 h1:s4qiPw8pgypqBGAy853u/zdZJ7K9cTZdM1rTiSonHrg=
 github.com/filecoin-project/specs-actors/v3 v3.1.0/go.mod h1:mpynccOLlIRy0QnR008BwYBwT9fen+sPR13MA1VmMww=
 github.com/filecoin-project/specs-actors/v4 v4.0.0 h1:vMALksY5G3J5rj3q9rbcyB+f4Tk1xrLqSgdB3jOok4s=
 github.com/filecoin-project/specs-actors/v4 v4.0.0/go.mod h1:TkHXf/l7Wyw4ZejyXIPS2rK8bBO0rdwhTZyQQgaglng=
-github.com/filecoin-project/specs-actors/v5 v5.0.0-20210510162709-3255bdd9f2bb h1:i2ZBHLiNYyyhNlfjfB/TGtGLlb8dgiGiVCDZlGpUtUc=
-github.com/filecoin-project/specs-actors/v5 v5.0.0-20210510162709-3255bdd9f2bb/go.mod h1:XAgQWq5pu0MBwx3MI5uJ6fK/Q8jCkZnKNNLxvDcbXew=
+github.com/filecoin-project/specs-actors/v5 v5.0.0-20210512015452-4fe3889fff57 h1:N6IBsnGXfAMXd677G6EiOKewFwQ7Ulcuupi4U6wYmXE=
+github.com/filecoin-project/specs-actors/v5 v5.0.0-20210512015452-4fe3889fff57/go.mod h1:283yBMMUSDB2abcjP/hhrwTkhb9h3sfM6KGrep/ZlBI=
 github.com/filecoin-project/specs-storage v0.1.1-0.20201105051918-5188d9774506 h1:Ur/l2+6qN+lQiqjozWWc5p9UDaAMDZKTlDS98oRnlIw=
 github.com/filecoin-project/specs-storage v0.1.1-0.20201105051918-5188d9774506/go.mod h1:nJRRM7Aa9XVvygr3W9k6xGF46RWzr2zxF/iGoAIfA/g=
 github.com/filecoin-project/test-vectors/schema v0.0.5 h1:w3zHQhzM4pYxJDl21avXjOKBLF8egrvwUwjpT8TquDg=
diff --git a/lotuspond/front/src/chain/methods.json b/lotuspond/front/src/chain/methods.json
index 12e0e8abf..f90e91914 100644
--- a/lotuspond/front/src/chain/methods.json
+++ b/lotuspond/front/src/chain/methods.json
@@ -281,7 +281,8 @@
     "ConfirmUpdateWorkerKey",
     "RepayDebt",
     "ChangeOwnerAddress",
-    "DisputeWindowedPoSt"
+    "DisputeWindowedPoSt",
+    "ProveCommitAggregate"
   ],
   "fil/3/storagepower": [
     "Send",
diff --git a/node/config/def.go b/node/config/def.go
index 63099516b..94e87be3b 100644
--- a/node/config/def.go
+++ b/node/config/def.go
@@ -82,6 +82,10 @@ type SealingConfig struct {
 
 	AlwaysKeepUnsealedCopy bool
 
+	AggregateCommits bool
+	MinCommitBatch   int
+	MaxCommitBatch   int
+
 	// Keep this many sectors in sealing pipeline, start CC if needed
 	// todo TargetSealingSectors uint64
 
@@ -237,6 +241,10 @@ func DefaultStorageMiner() *StorageMiner {
 			MaxSealingSectorsForDeals: 0,
 			WaitDealsDelay:            Duration(time.Hour * 6),
 			AlwaysKeepUnsealedCopy:    true,
+
+			AggregateCommits: true,
+			MinCommitBatch:   5, // todo: base this on some real numbers
+			MaxCommitBatch:   400,
 		},
 
 		Storage: sectorstorage.SealerConfig{
diff --git a/node/impl/storminer.go b/node/impl/storminer.go
index cad886e2d..8766ba154 100644
--- a/node/impl/storminer.go
+++ b/node/impl/storminer.go
@@ -378,6 +378,14 @@ func (sm *StorageMinerAPI) SectorMarkForUpgrade(ctx context.Context, id abi.Sect
 	return sm.Miner.MarkForUpgrade(id)
 }
 
+func (sm *StorageMinerAPI) SectorCommitFlush(ctx context.Context) (*cid.Cid, error) {
+	return sm.Miner.CommitFlush(ctx)
+}
+
+func (sm *StorageMinerAPI) SectorCommitPending(ctx context.Context) ([]abi.SectorID, error) {
+	return sm.Miner.CommitPending(ctx)
+}
+
 func (sm *StorageMinerAPI) WorkerConnect(ctx context.Context, url string) error {
 	w, err := connectRemoteWorker(ctx, sm, url)
 	if err != nil {
diff --git a/node/modules/storageminer.go b/node/modules/storageminer.go
index 1781d0493..1d89a0c4b 100644
--- a/node/modules/storageminer.go
+++ b/node/modules/storageminer.go
@@ -99,7 +99,7 @@ func GetParams(spt abi.RegisteredSealProof) error {
 	}
 
 	// TODO: We should fetch the params for the actual proof type, not just based on the size.
-	if err := paramfetch.GetParams(context.TODO(), build.ParametersJSON(), uint64(ssize)); err != nil {
+	if err := paramfetch.GetParams(context.TODO(), build.ParametersJSON(), build.SrsJSON(), uint64(ssize)); err != nil {
 		return xerrors.Errorf("fetching proof parameters: %w", err)
 	}
 
@@ -824,6 +824,9 @@ func NewSetSealConfigFunc(r repo.LockedRepo) (dtypes.SetSealingConfigFunc, error
 				MaxSealingSectorsForDeals: cfg.MaxSealingSectorsForDeals,
 				WaitDealsDelay:            config.Duration(cfg.WaitDealsDelay),
 				AlwaysKeepUnsealedCopy:    cfg.AlwaysKeepUnsealedCopy,
+				AggregateCommits:          cfg.AggregateCommits,
+				MinCommitBatch:            cfg.MinCommitBatch,
+				MaxCommitBatch:            cfg.MaxCommitBatch,
 			}
 		})
 		return
@@ -839,6 +842,9 @@ func NewGetSealConfigFunc(r repo.LockedRepo) (dtypes.GetSealingConfigFunc, error
 				MaxSealingSectorsForDeals: cfg.Sealing.MaxSealingSectorsForDeals,
 				WaitDealsDelay:            time.Duration(cfg.Sealing.WaitDealsDelay),
 				AlwaysKeepUnsealedCopy:    cfg.Sealing.AlwaysKeepUnsealedCopy,
+				AggregateCommits:          cfg.Sealing.AggregateCommits,
+				MinCommitBatch:            cfg.Sealing.MinCommitBatch,
+				MaxCommitBatch:            cfg.Sealing.MaxCommitBatch,
 			}
 		})
 		return
diff --git a/storage/sealing.go b/storage/sealing.go
index 8981c3738..b3d38909b 100644
--- a/storage/sealing.go
+++ b/storage/sealing.go
@@ -59,6 +59,14 @@ func (m *Miner) TerminatePending(ctx context.Context) ([]abi.SectorID, error) {
 	return m.sealing.TerminatePending(ctx)
 }
 
+func (m *Miner) CommitFlush(ctx context.Context) (*cid.Cid, error) {
+	return m.sealing.CommitFlush(ctx)
+}
+
+func (m *Miner) CommitPending(ctx context.Context) ([]abi.SectorID, error) {
+	return m.sealing.CommitPending(ctx)
+}
+
 func (m *Miner) MarkForUpgrade(id abi.SectorNumber) error {
 	return m.sealing.MarkForUpgrade(id)
 }