diff --git a/cmd/trakr/main.go b/cmd/trakr/main.go
index 1c7e2e8..3b34214 100644
--- a/cmd/trakr/main.go
+++ b/cmd/trakr/main.go
@@ -17,6 +17,7 @@ import (
 	httpfrontend "github.com/jzelinskie/trakr/frontend/http"
 	udpfrontend "github.com/jzelinskie/trakr/frontend/udp"
 	"github.com/jzelinskie/trakr/middleware"
+	"github.com/jzelinskie/trakr/storage/memory"
 )
 
 type ConfigFile struct {
@@ -101,6 +102,9 @@ func main() {
 					return err
 				}
 
+				// Force the compiler to enforce memory against the storage interface.
+				_, _ = memory.New(memory.Config{1})
+
 				errChan := make(chan error)
 				closedChan := make(chan struct{})
 
diff --git a/middleware/middleware.go b/middleware/middleware.go
index 91d1cc5..b9b31d1 100644
--- a/middleware/middleware.go
+++ b/middleware/middleware.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/jzelinskie/trakr/bittorrent"
 	"github.com/jzelinskie/trakr/frontend"
+	"github.com/jzelinskie/trakr/storage"
 )
 
 type Config struct {
@@ -18,7 +19,7 @@ type Config struct {
 
 var _ frontend.TrackerLogic = &Logic{}
 
-func NewLogic(config Config, peerStore PeerStore, announcePreHooks, announcePostHooks, scrapePreHooks, scrapePostHooks []Hook) *Logic {
+func NewLogic(config Config, peerStore storage.PeerStore, announcePreHooks, announcePostHooks, scrapePreHooks, scrapePostHooks []Hook) *Logic {
 	l := &Logic{
 		announceInterval:  config.AnnounceInterval,
 		peerStore:         peerStore,
@@ -51,7 +52,7 @@ func NewLogic(config Config, peerStore PeerStore, announcePreHooks, announcePost
 // executing a series of middleware hooks.
 type Logic struct {
 	announceInterval  time.Duration
-	peerStore         PeerStore
+	peerStore         storage.PeerStore
 	announcePreHooks  []Hook
 	announcePostHooks []Hook
 	scrapePreHooks    []Hook
diff --git a/storage/memory/peer_store.go b/storage/memory/peer_store.go
new file mode 100644
index 0000000..80aec6b
--- /dev/null
+++ b/storage/memory/peer_store.go
@@ -0,0 +1,371 @@
+package memory
+
+import (
+	"encoding/binary"
+	"log"
+	"net"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/jzelinskie/trakr/bittorrent"
+	"github.com/jzelinskie/trakr/storage"
+)
+
+// TODO(jzelinskie): separate ipv4 and ipv6 swarms
+
+type Config struct {
+	ShardCount int `yaml:"shard_count"`
+}
+
+func New(cfg Config) (storage.PeerStore, error) {
+	shardCount := 1
+	if cfg.ShardCount > 0 {
+		shardCount = cfg.ShardCount
+	}
+
+	shards := make([]*peerShard, shardCount)
+	for i := 0; i < shardCount; i++ {
+		shards[i] = &peerShard{}
+		shards[i].swarms = make(map[swarmKey]swarm)
+	}
+
+	return &peerStore{
+		shards: shards,
+		closed: make(chan struct{}),
+	}, nil
+}
+
+type serializedPeer string
+
+type swarmKey [21]byte
+
+func newSwarmKey(ih bittorrent.InfoHash, p bittorrent.Peer) (key swarmKey) {
+	for i, ihbyte := range ih {
+		key[i] = ihbyte
+	}
+	if len(p.IP) == net.IPv4len {
+		key[20] = byte(4)
+	} else {
+		key[20] = byte(6)
+	}
+
+	return
+}
+
+type peerShard struct {
+	swarms map[swarmKey]swarm
+	sync.RWMutex
+}
+
+type swarm struct {
+	// map serialized peer to mtime
+	seeders  map[serializedPeer]int64
+	leechers map[serializedPeer]int64
+}
+
+type peerStore struct {
+	shards []*peerShard
+	closed chan struct{}
+}
+
+var _ storage.PeerStore = &peerStore{}
+
+func (s *peerStore) shardIndex(infoHash bittorrent.InfoHash) uint32 {
+	return binary.BigEndian.Uint32(infoHash[:4]) % uint32(len(s.shards))
+}
+
+func newPeerKey(p bittorrent.Peer) serializedPeer {
+	b := make([]byte, 20+2+len(p.IP))
+	copy(b[:20], p.ID[:])
+	binary.BigEndian.PutUint16(b[20:22], p.Port)
+	copy(b[22:], p.IP)
+
+	return serializedPeer(b)
+}
+
+func decodePeerKey(pk serializedPeer) bittorrent.Peer {
+	return bittorrent.Peer{
+		ID:   bittorrent.PeerIDFromString(string(pk[:20])),
+		Port: binary.BigEndian.Uint16([]byte(pk[20:22])),
+		IP:   net.IP(pk[22:]),
+	}
+}
+
+func (s *peerStore) PutSeeder(ih bittorrent.InfoHash, p bittorrent.Peer) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, p)
+	pk := newPeerKey(p)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.Lock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.swarms[sk] = swarm{
+			seeders:  make(map[serializedPeer]int64),
+			leechers: make(map[serializedPeer]int64),
+		}
+	}
+
+	shard.swarms[sk].seeders[pk] = time.Now().UnixNano()
+
+	shard.Unlock()
+	return nil
+}
+
+func (s *peerStore) DeleteSeeder(ih bittorrent.InfoHash, p bittorrent.Peer) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, p)
+	pk := newPeerKey(p)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.Lock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.Unlock()
+		return storage.ErrResourceDoesNotExist
+	}
+
+	if _, ok := shard.swarms[sk].seeders[pk]; !ok {
+		shard.Unlock()
+		return storage.ErrResourceDoesNotExist
+	}
+
+	delete(shard.swarms[sk].seeders, pk)
+
+	if len(shard.swarms[sk].seeders)|len(shard.swarms[sk].leechers) == 0 {
+		delete(shard.swarms, sk)
+	}
+
+	shard.Unlock()
+	return nil
+}
+
+func (s *peerStore) PutLeecher(ih bittorrent.InfoHash, p bittorrent.Peer) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, p)
+	pk := newPeerKey(p)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.Lock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.swarms[sk] = swarm{
+			seeders:  make(map[serializedPeer]int64),
+			leechers: make(map[serializedPeer]int64),
+		}
+	}
+
+	shard.swarms[sk].leechers[pk] = time.Now().UnixNano()
+
+	shard.Unlock()
+	return nil
+}
+
+func (s *peerStore) DeleteLeecher(ih bittorrent.InfoHash, p bittorrent.Peer) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, p)
+	pk := newPeerKey(p)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.Lock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.Unlock()
+		return storage.ErrResourceDoesNotExist
+	}
+
+	if _, ok := shard.swarms[sk].leechers[pk]; !ok {
+		shard.Unlock()
+		return storage.ErrResourceDoesNotExist
+	}
+
+	delete(shard.swarms[sk].leechers, pk)
+
+	if len(shard.swarms[sk].seeders)|len(shard.swarms[sk].leechers) == 0 {
+		delete(shard.swarms, sk)
+	}
+
+	shard.Unlock()
+	return nil
+}
+
+func (s *peerStore) GraduateLeecher(ih bittorrent.InfoHash, p bittorrent.Peer) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, p)
+	pk := newPeerKey(p)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.Lock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.swarms[sk] = swarm{
+			seeders:  make(map[serializedPeer]int64),
+			leechers: make(map[serializedPeer]int64),
+		}
+	}
+
+	delete(shard.swarms[sk].leechers, pk)
+
+	shard.swarms[sk].seeders[pk] = time.Now().UnixNano()
+
+	shard.Unlock()
+	return nil
+}
+
+func (s *peerStore) CollectGarbage(cutoff time.Time) error {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	log.Printf("memory: collecting garbage. Cutoff time: %s", cutoff.String())
+	cutoffUnix := cutoff.UnixNano()
+	for _, shard := range s.shards {
+		shard.RLock()
+		var swarmKeys []swarmKey
+		for sk := range shard.swarms {
+			swarmKeys = append(swarmKeys, sk)
+		}
+		shard.RUnlock()
+		runtime.Gosched()
+
+		for _, sk := range swarmKeys {
+			shard.Lock()
+
+			if _, stillExists := shard.swarms[sk]; !stillExists {
+				shard.Unlock()
+				runtime.Gosched()
+				continue
+			}
+
+			for pk, mtime := range shard.swarms[sk].leechers {
+				if mtime <= cutoffUnix {
+					delete(shard.swarms[sk].leechers, pk)
+				}
+			}
+
+			for pk, mtime := range shard.swarms[sk].seeders {
+				if mtime <= cutoffUnix {
+					delete(shard.swarms[sk].seeders, pk)
+				}
+			}
+
+			if len(shard.swarms[sk].seeders)|len(shard.swarms[sk].leechers) == 0 {
+				delete(shard.swarms, sk)
+			}
+
+			shard.Unlock()
+			runtime.Gosched()
+		}
+
+		runtime.Gosched()
+	}
+
+	return nil
+}
+
+func (s *peerStore) AnnouncePeers(ih bittorrent.InfoHash, seeder bool, numWant int, announcer bittorrent.Peer) (peers []bittorrent.Peer, err error) {
+	select {
+	case <-s.closed:
+		panic("attempted to interact with stopped memory store")
+	default:
+	}
+
+	sk := newSwarmKey(ih, announcer)
+
+	shard := s.shards[s.shardIndex(ih)]
+	shard.RLock()
+
+	if _, ok := shard.swarms[sk]; !ok {
+		shard.RUnlock()
+		return nil, storage.ErrResourceDoesNotExist
+	}
+
+	if seeder {
+		// Append leechers as possible.
+		leechers := shard.swarms[sk].leechers
+		for p := range leechers {
+			decodedPeer := decodePeerKey(p)
+			if numWant == 0 {
+				break
+			}
+
+			peers = append(peers, decodedPeer)
+			numWant--
+		}
+	} else {
+		// Append as many seeders as possible.
+		seeders := shard.swarms[sk].seeders
+		for p := range seeders {
+			decodedPeer := decodePeerKey(p)
+			if numWant == 0 {
+				break
+			}
+
+			peers = append(peers, decodedPeer)
+			numWant--
+		}
+
+		// Append leechers until we reach numWant.
+		leechers := shard.swarms[sk].leechers
+		if numWant > 0 {
+			for p := range leechers {
+				decodedPeer := decodePeerKey(p)
+				if numWant == 0 {
+					break
+				}
+
+				if decodedPeer.Equal(announcer) {
+					continue
+				}
+				peers = append(peers, decodedPeer)
+				numWant--
+			}
+		}
+	}
+
+	shard.RUnlock()
+	return
+}
+
+func (s *peerStore) Stop() <-chan error {
+	toReturn := make(chan error)
+	go func() {
+		shards := make([]*peerShard, len(s.shards))
+		for i := 0; i < len(s.shards); i++ {
+			shards[i] = &peerShard{}
+			shards[i].swarms = make(map[swarmKey]swarm)
+		}
+		s.shards = shards
+		close(s.closed)
+		close(toReturn)
+	}()
+	return toReturn
+}
diff --git a/storage/memory/peer_store_test.go b/storage/memory/peer_store_test.go
new file mode 100644
index 0000000..9a00b17
--- /dev/null
+++ b/storage/memory/peer_store_test.go
@@ -0,0 +1,142 @@
+// Copyright 2016 The Chihaya Authors. All rights reserved.
+// Use of this source code is governed by the BSD 2-Clause license,
+// which can be found in the LICENSE file.
+
+package memory
+
+import (
+	"testing"
+
+	"github.com/chihaya/chihaya/server/store"
+)
+
+var (
+	peerStoreTester      = store.PreparePeerStoreTester(&peerStoreDriver{})
+	peerStoreBenchmarker = store.PreparePeerStoreBenchmarker(&peerStoreDriver{})
+	peerStoreTestConfig  = &store.DriverConfig{}
+)
+
+func init() {
+	unmarshalledConfig := struct {
+		Shards int
+	}{
+		1,
+	}
+	peerStoreTestConfig.Config = unmarshalledConfig
+}
+
+func TestPeerStore(t *testing.T) {
+	peerStoreTester.TestPeerStore(t, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutSeeder(b *testing.B) {
+	peerStoreBenchmarker.PutSeeder(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutSeeder1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.PutSeeder1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutSeeder1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutSeeder1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutSeeder1KInfohash1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutSeeder1KInfohash1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutDeleteSeeder(b *testing.B) {
+	peerStoreBenchmarker.PutDeleteSeeder(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutDeleteSeeder1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.PutDeleteSeeder1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutDeleteSeeder1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutDeleteSeeder1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutDeleteSeeder1KInfohash1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutDeleteSeeder1KInfohash1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_DeleteSeederNonExist(b *testing.B) {
+	peerStoreBenchmarker.DeleteSeederNonExist(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_DeleteSeederNonExist1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.DeleteSeederNonExist1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_DeleteSeederNonExist1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.DeleteSeederNonExist1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_DeleteSeederNonExist1KInfohash1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.DeleteSeederNonExist1KInfohash1KSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutGraduateDeleteLeecher(b *testing.B) {
+	peerStoreBenchmarker.PutGraduateDeleteLeecher(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutGraduateDeleteLeecher1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.PutGraduateDeleteLeecher1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutGraduateDeleteLeecher1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutGraduateDeleteLeecher1KLeechers(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_PutGraduateDeleteLeecher1KInfohash1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.PutGraduateDeleteLeecher1KInfohash1KLeechers(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GraduateLeecherNonExist(b *testing.B) {
+	peerStoreBenchmarker.GraduateLeecherNonExist(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GraduateLeecherNonExist1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.GraduateLeecherNonExist1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GraduateLeecherNonExist1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.GraduateLeecherNonExist1KLeechers(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GraduateLeecherNonExist1KInfohash1KSeeders(b *testing.B) {
+	peerStoreBenchmarker.GraduateLeecherNonExist1KInfohash1KLeechers(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_AnnouncePeers(b *testing.B) {
+	peerStoreBenchmarker.AnnouncePeers(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_AnnouncePeers1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.AnnouncePeers1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_AnnouncePeersSeeder(b *testing.B) {
+	peerStoreBenchmarker.AnnouncePeersSeeder(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_AnnouncePeersSeeder1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.AnnouncePeersSeeder1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GetSeeders(b *testing.B) {
+	peerStoreBenchmarker.GetSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_GetSeeders1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.GetSeeders1KInfohash(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_NumSeeders(b *testing.B) {
+	peerStoreBenchmarker.NumSeeders(b, peerStoreTestConfig)
+}
+
+func BenchmarkPeerStore_NumSeeders1KInfohash(b *testing.B) {
+	peerStoreBenchmarker.NumSeeders1KInfohash(b, peerStoreTestConfig)
+}
diff --git a/middleware/storage.go b/storage/storage.go
similarity index 99%
rename from middleware/storage.go
rename to storage/storage.go
index d9848a0..fb24a70 100644
--- a/middleware/storage.go
+++ b/storage/storage.go
@@ -1,4 +1,4 @@
-package middleware
+package storage
 
 import (
 	"time"