diff --git a/chain/deals/client.go b/chain/deals/client.go
index 1789d04c4..58d2ef7e4 100644
--- a/chain/deals/client.go
+++ b/chain/deals/client.go
@@ -212,7 +212,7 @@ func (c *Client) VerifyParams(ctx context.Context, data cid.Cid) (*actors.PieceI
 func (c *Client) Start(ctx context.Context, p ClientDealProposal, vd *actors.PieceInclVoucherData) (cid.Cid, error) {
 	// TODO: use data
 	proposal := StorageDealProposal{
-		PieceRef:          p.Data.String(),
+		PieceRef:          p.Data,
 		SerializationMode: SerializationUnixFs,
 		CommP:             vd.CommP[:],
 		Size:              vd.PieceSize.Uint64(),
diff --git a/chain/deals/handler.go b/chain/deals/handler.go
index 94f64a96b..6bf8713f1 100644
--- a/chain/deals/handler.go
+++ b/chain/deals/handler.go
@@ -2,13 +2,12 @@ package deals
 
 import (
 	"context"
+	"github.com/filecoin-project/go-lotus/storage/sealedbstore"
 	"math"
 
 	"github.com/filecoin-project/go-lotus/api"
 	"github.com/filecoin-project/go-lotus/chain/address"
 	"github.com/filecoin-project/go-lotus/node/modules/dtypes"
-	"github.com/filecoin-project/go-lotus/storage/sector"
-
 	"github.com/ipfs/go-cid"
 	"github.com/ipfs/go-datastore"
 	"github.com/ipfs/go-datastore/namespace"
@@ -35,7 +34,7 @@ type MinerDeal struct {
 }
 
 type Handler struct {
-	secst *sector.Store
+	secst *sealedbstore.Sealedbstore
 	full  api.FullNode
 
 	// TODO: Use a custom protocol or graphsync in the future
@@ -60,7 +59,7 @@ type dealUpdate struct {
 	mut      func(*MinerDeal)
 }
 
-func NewHandler(ds dtypes.MetadataDS, secst *sector.Store, dag dtypes.StagingDAG, fullNode api.FullNode) (*Handler, error) {
+func NewHandler(ds dtypes.MetadataDS, secst *sealedbstore.Sealedbstore, dag dtypes.StagingDAG, fullNode api.FullNode) (*Handler, error) {
 	addr, err := ds.Get(datastore.NewKey("miner-address"))
 	if err != nil {
 		return nil, err
diff --git a/chain/deals/handler_states.go b/chain/deals/handler_states.go
index 486af2c83..1693d5a95 100644
--- a/chain/deals/handler_states.go
+++ b/chain/deals/handler_states.go
@@ -2,12 +2,13 @@ package deals
 
 import (
 	"context"
-	"github.com/filecoin-project/go-lotus/lib/sectorbuilder"
 
-	files "github.com/ipfs/go-ipfs-files"
 	"github.com/ipfs/go-merkledag"
 	unixfile "github.com/ipfs/go-unixfs/file"
 	"golang.org/x/xerrors"
+
+	"github.com/filecoin-project/go-lotus/lib/sectorbuilder"
+	"github.com/filecoin-project/go-lotus/storage/sealedbstore"
 )
 
 type handlerFunc func(ctx context.Context, deal MinerDeal) (func(*MinerDeal), error)
@@ -75,18 +76,13 @@ func (h *Handler) staged(ctx context.Context, deal MinerDeal) (func(*MinerDeal),
 		return nil, xerrors.Errorf("cannot open unixfs file: %s", err)
 	}
 
-	uf, ok := n.(files.File)
+	uf, ok := n.(sealedbstore.UnixfsReader)
 	if !ok {
 		// we probably got directory, unsupported for now
 		return nil, xerrors.Errorf("unsupported unixfs type")
 	}
 
-	size, err := uf.Size()
-	if err != nil {
-		return nil, xerrors.Errorf("failed to get file size: %s", err)
-	}
-
-	sectorID, err := h.secst.AddPiece(deal.Proposal.PieceRef, uint64(size), uf, deal.Proposal.Duration)
+	sectorID, err := h.secst.AddUnixfsPiece(deal.Proposal.PieceRef, uf, deal.Proposal.Duration)
 	if err != nil {
 		return nil, xerrors.Errorf("AddPiece failed: %s", err)
 	}
diff --git a/chain/deals/types.go b/chain/deals/types.go
index f03688cab..f17fb1cac 100644
--- a/chain/deals/types.go
+++ b/chain/deals/types.go
@@ -41,7 +41,7 @@ const (
 )
 
 type StorageDealProposal struct {
-	PieceRef          string
+	PieceRef          cid.Cid // TODO: port to spec
 	SerializationMode SerializationMode
 	CommP             []byte
 
diff --git a/go.mod b/go.mod
index 7e2508c41..cf385f063 100644
--- a/go.mod
+++ b/go.mod
@@ -5,67 +5,66 @@ go 1.12
 require (
 	contrib.go.opencensus.io/exporter/jaeger v0.1.0
 	github.com/BurntSushi/toml v0.3.1
+	github.com/dgraph-io/badger v1.6.0 // indirect
 	github.com/filecoin-project/go-bls-sigs v0.0.0-20190718224239-4bc4b8a7bbf8
 	github.com/filecoin-project/go-leb128 v0.0.0-20190212224330-8d79a5489543
 	github.com/filecoin-project/go-sectorbuilder v0.0.0-00010101000000-000000000000
 	github.com/gbrlsnchs/jwt/v3 v3.0.0-beta.1
+	github.com/golang/mock v1.3.1 // indirect
 	github.com/gorilla/websocket v1.4.0
-	github.com/ipfs/go-bitswap v0.1.6-0.20190808170517-167327fc3c5e
+	github.com/ipfs/go-bitswap v0.1.7-0.20190808170517-167327fc3c5e
 	github.com/ipfs/go-block-format v0.0.2
 	github.com/ipfs/go-blockservice v0.1.2
-	github.com/ipfs/go-car v0.0.1
+	github.com/ipfs/go-car v0.0.0-20190823083746-79984a8632b4
 	github.com/ipfs/go-cid v0.0.3
-	github.com/ipfs/go-datastore v0.0.5
+	github.com/ipfs/go-datastore v0.1.0
 	github.com/ipfs/go-ds-badger v0.0.5
 	github.com/ipfs/go-filestore v0.0.2
 	github.com/ipfs/go-fs-lock v0.0.1
 	github.com/ipfs/go-hamt-ipld v0.0.12-0.20190822003241-7ff276389cbf
-	github.com/ipfs/go-ipfs-blockstore v0.0.1
+	github.com/ipfs/go-ipfs-blockstore v0.0.2
 	github.com/ipfs/go-ipfs-chunker v0.0.1
+	github.com/ipfs/go-ipfs-ds-help v0.0.1
 	github.com/ipfs/go-ipfs-exchange-interface v0.0.1
 	github.com/ipfs/go-ipfs-exchange-offline v0.0.1
-	github.com/ipfs/go-ipfs-files v0.0.3
+	github.com/ipfs/go-ipfs-files v0.0.4
 	github.com/ipfs/go-ipfs-routing v0.1.0
 	github.com/ipfs/go-ipld-cbor v0.0.3
 	github.com/ipfs/go-ipld-format v0.0.2
 	github.com/ipfs/go-log v0.0.2-0.20190708183747-9c9fd6111bea
-	github.com/ipfs/go-merkledag v0.1.0
-	github.com/ipfs/go-unixfs v0.1.0
+	github.com/ipfs/go-merkledag v0.2.3
+	github.com/ipfs/go-unixfs v0.2.1
 	github.com/ipsn/go-secp256k1 v0.0.0-20180726113642-9d62b9f0bc52
-	github.com/libp2p/go-eventbus v0.0.3 // indirect
-	github.com/libp2p/go-libp2p v0.2.0
-	github.com/libp2p/go-libp2p-circuit v0.1.0
+	github.com/libp2p/go-libp2p v0.3.0
+	github.com/libp2p/go-libp2p-circuit v0.1.1
 	github.com/libp2p/go-libp2p-connmgr v0.1.0
-	github.com/libp2p/go-libp2p-core v0.0.6
+	github.com/libp2p/go-libp2p-core v0.2.2
 	github.com/libp2p/go-libp2p-discovery v0.1.0
 	github.com/libp2p/go-libp2p-kad-dht v0.1.1
 	github.com/libp2p/go-libp2p-mplex v0.2.1
 	github.com/libp2p/go-libp2p-peer v0.2.0
-	github.com/libp2p/go-libp2p-peerstore v0.1.2-0.20190621130618-cfa9bb890c1a
+	github.com/libp2p/go-libp2p-peerstore v0.1.3
 	github.com/libp2p/go-libp2p-pnet v0.1.0
 	github.com/libp2p/go-libp2p-pubsub v0.1.0
 	github.com/libp2p/go-libp2p-quic-transport v0.1.1
-	github.com/libp2p/go-libp2p-record v0.1.0
+	github.com/libp2p/go-libp2p-record v0.1.1
 	github.com/libp2p/go-libp2p-routing-helpers v0.1.0
-	github.com/libp2p/go-libp2p-secio v0.1.0
-	github.com/libp2p/go-libp2p-swarm v0.1.1 // indirect
+	github.com/libp2p/go-libp2p-secio v0.2.0
 	github.com/libp2p/go-libp2p-tls v0.1.0
 	github.com/libp2p/go-libp2p-yamux v0.2.1
 	github.com/libp2p/go-maddr-filter v0.0.5
+	github.com/miekg/dns v1.1.16 // indirect
 	github.com/minio/blake2b-simd v0.0.0-20160723061019-3f5f724cb5b1
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/multiformats/go-base32 v0.0.3
 	github.com/multiformats/go-multiaddr v0.0.4
 	github.com/multiformats/go-multiaddr-dns v0.0.3
 	github.com/multiformats/go-multiaddr-net v0.0.1
-	github.com/multiformats/go-multihash v0.0.6
+	github.com/multiformats/go-multihash v0.0.7
 	github.com/opentracing/opentracing-go v1.1.0
 	github.com/pkg/errors v0.8.1
 	github.com/polydawn/refmt v0.0.0-20190809202753-05966cbd336a
-	github.com/smartystreets/assertions v1.0.1 // indirect
-	github.com/smartystreets/goconvey v0.0.0-20190710185942-9d28bd7c0945 // indirect
-	github.com/stretchr/objx v0.1.1 // indirect
-	github.com/stretchr/testify v1.3.0
+	github.com/stretchr/testify v1.4.0
 	github.com/whyrusleeping/cbor-gen v0.0.0-20190822012446-bb2210dd2804
 	github.com/whyrusleeping/multiaddr-filter v0.0.0-20160516205228-e903e4adabd7
 	github.com/whyrusleeping/pubsub v0.0.0-20131020042734-02de8aa2db3d
@@ -75,11 +74,8 @@ require (
 	go.uber.org/fx v1.9.0
 	go.uber.org/goleak v0.10.0 // indirect
 	go4.org v0.0.0-20190313082347-94abd6928b1d // indirect
-	golang.org/x/crypto v0.0.0-20190701094942-4def268fd1a4 // indirect
-	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 // indirect
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
-	golang.org/x/sys v0.0.0-20190730183949-1393eb018365 // indirect
 	golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7
+	google.golang.org/api v0.9.0 // indirect
 	gopkg.in/urfave/cli.v2 v2.0.0-20180128182452-d3ae77c26ac8
 	launchpad.net/gocheck v0.0.0-20140225173054-000000000087 // indirect
 )
@@ -87,3 +83,7 @@ require (
 replace github.com/filecoin-project/go-bls-sigs => ./extern/go-bls-sigs
 
 replace github.com/filecoin-project/go-sectorbuilder => ./extern/go-sectorbuilder
+
+replace github.com/ipfs/go-car => /home/magik6k/gohack/github.com/ipfs/go-car
+
+replace github.com/ipfs/go-unixfs => /home/magik6k/gohack/github.com/ipfs/go-unixfs
diff --git a/go.sum b/go.sum
index 10669286e..a578cb228 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,6 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 contrib.go.opencensus.io/exporter/jaeger v0.1.0 h1:WNc9HbA38xEQmsI40Tjd/MNU/g8byN2Of7lwIjv0Jdc=
 contrib.go.opencensus.io/exporter/jaeger v0.1.0/go.mod h1:VYianECmuFPwU37O699Vc1GOcy+y8kOsfaxHRImmjbA=
 github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
@@ -21,10 +22,14 @@ github.com/apache/thrift v0.12.0 h1:pODnxUFNcjP9UTLZGTdeh+j16A8lJbRvD3rOtrk/7bs=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8=
 github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50 h1:4i3KsuVA0o0KoBxAC5x+MY7RbteiMK1V7gf/G08NGIQ=
 github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
+github.com/btcsuite/btcd v0.0.0-20190807005414-4063feeff79a h1:We35J+0yvVFrEXbtViYUW8H/wNOhqjIF3PsrW4yYmGw=
+github.com/btcsuite/btcd v0.0.0-20190807005414-4063feeff79a/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f/go.mod h1:TdznJufoqS23FtqVCzL0ZqgP5MqXbb4fg/WgDys70nA=
 github.com/btcsuite/btcutil v0.0.0-20190207003914-4c204d697803/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
 github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d/go.mod h1:+5NJ2+qvTyV9exUAL/rxXi3DcLg2Ts+ymUAY5y4NvMg=
@@ -53,8 +58,8 @@ github.com/davidlazar/go-crypto v0.0.0-20170701192655-dcfb0a7ac018/go.mod h1:rQY
 github.com/dgraph-io/badger v1.5.5-0.20190226225317-8115aed38f8f/go.mod h1:VZxzAIRPHRVNRKRo6AXrX9BJegn6il06VMTZVJYCIjQ=
 github.com/dgraph-io/badger v1.6.0-rc1 h1:JphPpoBZJ3WHha133BGYlQqltSGIhV+VsEID0++nN9A=
 github.com/dgraph-io/badger v1.6.0-rc1/go.mod h1:zwt7syl517jmP8s94KqSxTlM6IMsdhYy6psNgSztDR4=
-github.com/dgraph-io/badger/v2 v2.0.0-20190620211019-41d170b5158f/go.mod h1:jUaIjOV835xZ/mCLG/8P/38ZxiT4bG/K1khDNZJxuwU=
-github.com/dgryski/go-farm v0.0.0-20180109070241-2de33835d102/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
+github.com/dgraph-io/badger v1.6.0 h1:DshxFxZWXUcO0xX476VJC07Xsr6ZCBVRHKZ93Oh7Evo=
+github.com/dgraph-io/badger v1.6.0/go.mod h1:zwt7syl517jmP8s94KqSxTlM6IMsdhYy6psNgSztDR4=
 github.com/dgryski/go-farm v0.0.0-20190104051053-3adb47b1fb0f/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2 h1:tdlZCpZ/P9DhczCTSixgIKmwPv6+wP5DGjqLYw5SUiA=
 github.com/dgryski/go-farm v0.0.0-20190423205320-6a90982ecee2/go.mod h1:SqUrOPUnsFjfmXRMNPybcSiG0BgUW2AuFH8PAnS2iTw=
@@ -63,7 +68,6 @@ github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25Kn
 github.com/eapache/go-resiliency v1.1.0/go.mod h1:kFI+JgMyC7bLPUVY133qvEBtVayf5mFgVsvEsIPBvNs=
 github.com/eapache/go-xerial-snappy v0.0.0-20180814174437-776d5712da21/go.mod h1:+020luEh2TKB4/GOp8oxxtq0Daoen/Cii55CzbTV6DU=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
-github.com/fd/go-nat v1.0.0/go.mod h1:BTBu/CKvMmOMUPkKVef1pngt2WFH/lg7E6yQnulfp6E=
 github.com/filecoin-project/go-leb128 v0.0.0-20190212224330-8d79a5489543 h1:aMJGfgqe1QDhAVwxRg5fjCRF533xHidiKsugk7Vvzug=
 github.com/filecoin-project/go-leb128 v0.0.0-20190212224330-8d79a5489543/go.mod h1:mjrHv1cDGJWDlGmC0eDc1E5VJr8DmL9XMUcaFwiuKg8=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
@@ -74,6 +78,7 @@ github.com/go-check/check v0.0.0-20180628173108-788fd7840127 h1:0gkP6mzaMqkmpcJY
 github.com/go-check/check v0.0.0-20180628173108-788fd7840127/go.mod h1:9ES+weclKsC9YodN5RgxqK/VD9HM9JsCSh7rNhMZE98=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
+github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
@@ -83,26 +88,39 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.2.0 h1:28o5sBqPkBsMGnC6b4MvE2TzSr5/AT4c/1fLqVGIwlk=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.3.1 h1:qGJ6qTW+x6xX/my+8YUVl4WNpX9B7+/l2tRsHGZ7f2s=
+github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.0/go.mod h1:Qd/q+1AKNOZr9uGQzbzCmRO6sUih6GTPZv6a1/R87v0=
 github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
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@@ -110,31 +128,30 @@ github.com/hashicorp/go-multierror v1.0.0/go.mod h1:dHtQlpGsu+cZNNAkkCN/P3hoUDHh
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@@ -142,10 +159,11 @@ github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUP
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@@ -157,6 +175,8 @@ github.com/ipfs/go-hamt-ipld v0.0.12-0.20190822003241-7ff276389cbf h1:P9Kkd8YCG4
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@@ -172,17 +192,16 @@ github.com/ipfs/go-ipfs-exchange-offline v0.0.1 h1:P56jYKZF7lDDOLx5SotVh5KFxoY6C
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@@ -192,9 +211,10 @@ github.com/ipfs/go-ipld-format v0.0.2/go.mod h1:4B6+FM2u9OJ9zCV+kSbgFAZlOrv1Hqbf
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@@ -202,13 +222,10 @@ github.com/ipfs/go-peertaskqueue v0.1.1 h1:+gPjbI+V3NktXZOqJA1kzbms2pYmhjgQQal0M
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@@ -486,16 +516,18 @@ github.com/spaolacci/murmur3 v1.1.0 h1:7c1g84S4BPRrfL5Xrdp6fOJ206sU9y293DDHaoy0b
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@@ -504,7 +536,6 @@ github.com/warpfork/go-wish v0.0.0-20190328234359-8b3e70f8e830 h1:8kxMKmKzXXL4Ru
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@@ -515,9 +546,6 @@ github.com/whyrusleeping/go-keyspace v0.0.0-20160322163242-5b898ac5add1/go.mod h
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@@ -530,7 +558,7 @@ github.com/whyrusleeping/sharray v0.0.0-20190718051354-e41931821e33 h1:7Bsg3GZnF
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@@ -553,6 +581,7 @@ go4.org v0.0.0-20190313082347-94abd6928b1d h1:JkRdGP3zvTtTbabWSAC6n67ka30y7gOzWA
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@@ -565,18 +594,20 @@ golang.org/x/crypto v0.0.0-20190611184440-5c40567a22f8/go.mod h1:yigFU9vqHzYiE8U
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@@ -584,14 +615,17 @@ golang.org/x/net v0.0.0-20190227160552-c95aed5357e7/go.mod h1:mL1N/T3taQHkDXs73r
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 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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+golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20190611141213-3f473d35a33a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 h1:Ao/3l156eZf2AW5wK8a7/smtodRU+gha3+BeqJ69lRk=
-golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7 h1:fHDIZ2oxGnUZRN6WgWFCbYBjH9uqVPRCUVUDhs0wnbA=
+golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
+golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -601,10 +635,10 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20180928133829-e4b3c5e90611/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20181218192612-074acd46bca6/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190219092855-153ac476189d/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -612,35 +646,50 @@ golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190302025703-b6889370fb10/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190524122548-abf6ff778158/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190526052359-791d8a0f4d09/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190610200419-93c9922d18ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190626221950-04f50cda93cb/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190730183949-1393eb018365 h1:SaXEMXhWzMJThc05vu6uh61Q245r4KaWMrsTedk0FDc=
-golang.org/x/sys v0.0.0-20190730183949-1393eb018365/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a h1:aYOabOQFp6Vj6W1F80affTUvO9UxmJRx8K0gsfABByQ=
+golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180828015842-6cd1fcedba52/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20181130052023-1c3d964395ce/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+golang.org/x/tools v0.0.0-20190813142322-97f12d73768f/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/xerrors v0.0.0-20190513163551-3ee3066db522/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7 h1:9zdDQZ7Thm29KFXgAX/+yaf3eVbP7djjWp/dXAppNCc=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
 google.golang.org/api v0.3.2 h1:iTp+3yyl/KOtxa/d1/JUE0GGSoR6FuW5udver22iwpw=
 google.golang.org/api v0.3.2/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
+google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
+google.golang.org/api v0.9.0 h1:jbyannxz0XFD3zdjgrSUsaJbgpH4eTrkdhRChkHPfO8=
+google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
@@ -651,6 +700,8 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/src-d/go-cli.v0 v0.0.0-20181105080154-d492247bbc0d/go.mod h1:z+K8VcOYVYcSwSjGebuDL6176A1XskgbtNl64NSg+n8=
+gopkg.in/src-d/go-log.v1 v1.0.1/go.mod h1:GN34hKP0g305ysm2/hctJ0Y8nWP3zxXXJ8GFabTyABE=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/urfave/cli.v2 v2.0.0-20180128182452-d3ae77c26ac8 h1:Ggy3mWN4l3PUFPfSG0YB3n5fVYggzysUmiUQ89SnX6Y=
@@ -660,5 +711,7 @@ gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 launchpad.net/gocheck v0.0.0-20140225173054-000000000087 h1:Izowp2XBH6Ya6rv+hqbceQyw/gSGoXfH/UPoTGduL54=
 launchpad.net/gocheck v0.0.0-20140225173054-000000000087/go.mod h1:hj7XX3B/0A+80Vse0e+BUHsHMTEhd0O4cpUHr/e/BUM=
diff --git a/node/impl/storminer.go b/node/impl/storminer.go
index 2c3b6e552..dab62407d 100644
--- a/node/impl/storminer.go
+++ b/node/impl/storminer.go
@@ -31,7 +31,7 @@ func (sm *StorageMinerAPI) StoreGarbageData(ctx context.Context) (uint64, error)
 	size := uint64(1016) // this is the most data we can fit in a 1024 byte sector
 
 	name := fmt.Sprintf("fake-file-%d", rand.Intn(100000000))
-	sectorId, err := sm.Sectors.AddPiece(name, size, io.LimitReader(rand.New(rand.NewSource(42)), 1016), 0)
+	sectorId, err := sm.Sectors.AddPiece(name, size, io.LimitReader(rand.New(rand.NewSource(42)), 1016))
 	if err != nil {
 		return 0, err
 	}
diff --git a/retrieval/types.go b/retrieval/types.go
new file mode 100644
index 000000000..bc19f6468
--- /dev/null
+++ b/retrieval/types.go
@@ -0,0 +1,31 @@
+package retrieval
+
+import (
+	"github.com/ipfs/go-cid"
+
+	"github.com/filecoin-project/go-lotus/chain/types"
+)
+
+type QueryResponse int
+const (
+	Available QueryResponse = iota
+	Unavailable
+)
+
+type RetDealProposal struct {
+	Piece cid.Cid
+	Price types.BigInt
+	Payment types.SignedVoucher
+}
+
+type RetQuery struct {
+	Piece cid.Cid
+}
+
+type RetQueryResponse struct {
+	Status QueryResponse
+
+	MinPricePerMiB types.BigInt // TODO: check units used for sector size
+}
+
+
diff --git a/storage/sealedbstore/sealedbstore.go b/storage/sealedbstore/sealedbstore.go
new file mode 100644
index 000000000..d6472b9a4
--- /dev/null
+++ b/storage/sealedbstore/sealedbstore.go
@@ -0,0 +1,120 @@
+package sealedbstore
+
+import (
+	"sync"
+
+	"github.com/ipfs/go-cid"
+	"github.com/ipfs/go-datastore"
+	dshelp "github.com/ipfs/go-ipfs-ds-help"
+	files "github.com/ipfs/go-ipfs-files"
+	cbor "github.com/ipfs/go-ipld-cbor"
+
+	"github.com/filecoin-project/go-lotus/storage/sector"
+)
+
+type SealSerialization uint8
+
+const (
+	SerializationUnixfs0 SealSerialization = 'u'
+)
+
+type SealedRef struct {
+	Serialization SealSerialization
+
+	Piece cid.Cid
+	Offset uint64
+	Size uint32
+}
+
+type Sealedbstore struct {
+	*sector.Store
+
+	keys datastore.Batching
+	keyLk sync.Mutex
+}
+
+type UnixfsReader interface {
+	files.File
+
+	// ReadBlock reads data from a single unixfs block. Data is nil
+	// for intermediate nodes
+	ReadBlock() (data []byte, offset uint64, cid cid.Cid, err error)
+}
+
+type refStorer struct {
+	blockReader UnixfsReader
+	writeRef func(cid cid.Cid, offset uint64, size uint32) error
+
+	pieceRef string
+	remaining []byte
+}
+
+func (st *Sealedbstore) writeRef(cid cid.Cid, offset uint64, size uint32) error {
+	st.keyLk.Lock() // TODO: make this multithreaded
+	defer st.keyLk.Unlock()
+
+	v, err := st.keys.Get(dshelp.CidToDsKey(cid))
+	if err == datastore.ErrNotFound {
+		err = nil
+	}
+	if err != nil {
+		return err
+	}
+
+	var refs []SealedRef
+	if len(v) > 0 {
+		if err := cbor.DecodeInto(v, &refs); err != nil {
+			return err
+		}
+	}
+
+	refs = append(refs, SealedRef{
+		Serialization: SerializationUnixfs0,
+		Piece:         cid,
+		Offset:        offset,
+		Size:          size,
+	})
+
+	newRef, err := cbor.DumpObject(&refs)
+	if err != nil {
+		return err
+	}
+	return st.keys.Put(dshelp.CidToDsKey(cid), newRef) // TODO: batch somehow
+}
+
+func (r *refStorer) Read(p []byte) (n int, err error) {
+	offset := 0
+	if len(r.remaining) > 0 {
+		offset += len(r.remaining)
+		read := copy(p, r.remaining)
+		if read == len(r.remaining) {
+			r.remaining = nil
+		} else {
+			r.remaining = r.remaining[read:]
+		}
+		return read, nil
+	}
+
+	for {
+		data, offset, cid, err := r.blockReader.ReadBlock()
+		if err != nil {
+			return 0, err
+		}
+
+		if err := r.writeRef(cid, offset, uint32(len(data))); err != nil {
+			return 0, err
+		}
+
+	}
+}
+
+func (st *Sealedbstore) AddUnixfsPiece(ref cid.Cid, r UnixfsReader, keepAtLeast uint64) (sectorID uint64, err error) {
+	size, err := r.Size()
+	if err != nil {
+		return 0, err
+	}
+
+	refst := &refStorer{blockReader: r, pieceRef: string(SerializationUnixfs0)+ref.String(), writeRef: st.writeRef}
+
+	return st.Store.AddPiece(refst.pieceRef, uint64(size), refst)
+}
diff --git a/storage/sector/store.go b/storage/sector/store.go
index 2f366cbe3..3d18e77ad 100644
--- a/storage/sector/store.go
+++ b/storage/sector/store.go
@@ -99,7 +99,7 @@ func (s *Store) service() {
 	}
 }
 
-func (s *Store) AddPiece(ref string, size uint64, r io.Reader, keepAtLeast uint64) (sectorID uint64, err error) {
+func (s *Store) AddPiece(ref string, size uint64, r io.Reader) (sectorID uint64, err error) {
 	err = withTemp(r, func(f string) (err error) {
 		sectorID, err = s.sb.AddPiece(ref, size, f)
 		return err