diff --git a/go.mod b/go.mod
index d1ba28a6..3d10bf54 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.13
 require (
 	github.com/btcsuite/btcd v0.21.0-beta
 	github.com/btcsuite/btcutil v1.0.2
-	github.com/coinbase/rosetta-sdk-go v0.6.3
+	github.com/coinbase/rosetta-sdk-go v0.6.5
 	github.com/dgraph-io/badger/v2 v2.2007.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.2.2
 	github.com/stretchr/testify v1.6.1
diff --git a/go.sum b/go.sum
index a5f470a3..75c15686 100644
--- a/go.sum
+++ b/go.sum
@@ -66,8 +66,8 @@ github.com/client9/misspell v0.3.4 h1:ta993UF76GwbvJcIo3Y68y/M3WxlpEHPWIGDkJYwzJ
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cloudflare/cloudflare-go v0.10.2-0.20190916151808-a80f83b9add9/go.mod h1:1MxXX1Ux4x6mqPmjkUgTP1CdXIBXKX7T+Jk9Gxrmx+U=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/coinbase/rosetta-sdk-go v0.6.3 h1:PPj14tPJ7SFc8sY/hlwK8zddT7PKwWU2wicxyerDxlg=
-github.com/coinbase/rosetta-sdk-go v0.6.3/go.mod h1:MvQfsL2KlJ5786OdDviRIJE3agui2YcvS1CaQPDl1Yo=
+github.com/coinbase/rosetta-sdk-go v0.6.5 h1:RytFDCPXS64vEYwIOsxsoQGlZZyP9RQvzyYikxymI4w=
+github.com/coinbase/rosetta-sdk-go v0.6.5/go.mod h1:MvQfsL2KlJ5786OdDviRIJE3agui2YcvS1CaQPDl1Yo=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
diff --git a/indexer/indexer.go b/indexer/indexer.go
index cd3f2809..9f8bb199 100644
--- a/indexer/indexer.go
+++ b/indexer/indexer.go
@@ -18,6 +18,8 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"runtime"
+	"sync"
 	"time"
 
 	"github.com/coinbase/rosetta-bitcoin/bitcoin"
@@ -34,6 +36,7 @@ import (
 	sdkUtils "github.com/coinbase/rosetta-sdk-go/utils"
 	"github.com/dgraph-io/badger/v2"
 	"github.com/dgraph-io/badger/v2/options"
+	"golang.org/x/sync/semaphore"
 )
 
 const (
@@ -58,6 +61,15 @@ const (
 
 	// zeroValue is 0 as a string
 	zeroValue = "0"
+
+	// overclockMultiplier is the amount
+	// we multiply runtime.NumCPU by to determine
+	// how many goroutines we should
+	// spwan to handle block data sequencing.
+	overclockMultiplier = 16
+
+	// semaphoreWeight is the weight of each semaphore request.
+	semaphoreWeight = int64(1)
 )
 
 var (
@@ -97,6 +109,20 @@ type Indexer struct {
 	workers        []modules.BlockWorker
 
 	waiter *waitTable
+
+	// Store coins created in pre-store before persisted
+	// in add block so we can optimistically populate
+	// blocks before committed.
+	coinCache      map[string]*types.AccountCoin
+	coinCacheMutex *sdkUtils.PriorityMutex
+
+	// When populating blocks using pre-stored blocks,
+	// we should retry if a new block was seen (similar
+	// to trying again if head block changes).
+	seen      int64
+	seenMutex sync.Mutex
+
+	seenSemaphore *semaphore.Weighted
 }
 
 // CloseDatabase closes a storage.Database. This should be called
@@ -178,7 +204,7 @@ func Initialize(
 		return nil, fmt.Errorf("%w: unable to initialize storage", err)
 	}
 
-	blockStorage := modules.NewBlockStorage(localStore)
+	blockStorage := modules.NewBlockStorage(localStore, runtime.NumCPU()*overclockMultiplier)
 	asserter, err := asserter.NewClientWithOptions(
 		config.Network,
 		config.GenesisBlockIdentifier,
@@ -192,14 +218,17 @@ func Initialize(
 	}
 
 	i := &Indexer{
-		cancel:        cancel,
-		network:       config.Network,
-		pruningConfig: config.Pruning,
-		client:        client,
-		database:      localStore,
-		blockStorage:  blockStorage,
-		waiter:        newWaitTable(),
-		asserter:      asserter,
+		cancel:         cancel,
+		network:        config.Network,
+		pruningConfig:  config.Pruning,
+		client:         client,
+		database:       localStore,
+		blockStorage:   blockStorage,
+		waiter:         newWaitTable(),
+		asserter:       asserter,
+		coinCache:      map[string]*types.AccountCoin{},
+		coinCacheMutex: new(sdkUtils.PriorityMutex),
+		seenSemaphore:  semaphore.NewWeighted(int64(runtime.NumCPU())),
 	}
 
 	coinStorage := modules.NewCoinStorage(
@@ -330,35 +359,31 @@ func (i *Indexer) BlockAdded(ctx context.Context, block *types.Block) error {
 	}
 
 	ops := 0
-
-	// Close channels of all blocks waiting.
-	i.waiter.Lock()
 	for _, transaction := range block.Transactions {
 		ops += len(transaction.Operations)
-		txHash := transaction.TransactionIdentifier.Hash
-		val, ok := i.waiter.Get(txHash, false)
-		if !ok {
-			continue
-		}
+	}
 
-		if val.channelClosed {
-			logger.Debugw(
-				"channel already closed",
-				"hash", block.BlockIdentifier.Hash,
-				"index", block.BlockIdentifier.Index,
-				"channel", txHash,
-			)
-			continue
-		}
+	// clean cache intermediate
+	i.coinCacheMutex.Lock(true)
+	for _, tx := range block.Transactions {
+		for _, op := range tx.Operations {
+			if op.CoinChange == nil {
+				continue
+			}
 
-		// Closing channel will cause all listeners to continue
-		val.channelClosed = true
-		close(val.channel)
+			if op.CoinChange.CoinAction != types.CoinCreated {
+				continue
+			}
+
+			delete(i.coinCache, op.CoinChange.CoinIdentifier.Identifier)
+		}
 	}
+	i.coinCacheMutex.Unlock()
 
 	// Look for all remaining waiting transactions associated
 	// with the next block that have not yet been closed. We should
 	// abort these waits as they will never be closed by a new transaction.
+	i.waiter.Lock()
 	for txHash, val := range i.waiter.table {
 		if val.earliestBlock == block.BlockIdentifier.Index+1 && !val.channelClosed {
 			logger.Debugw(
@@ -385,6 +410,91 @@ func (i *Indexer) BlockAdded(ctx context.Context, block *types.Block) error {
 	return nil
 }
 
+// BlockSeen is called by the syncer when a block is encountered.
+func (i *Indexer) BlockSeen(ctx context.Context, block *types.Block) error {
+	if err := i.seenSemaphore.Acquire(ctx, semaphoreWeight); err != nil {
+		return err
+	}
+	defer i.seenSemaphore.Release(semaphoreWeight)
+
+	logger := utils.ExtractLogger(ctx, "indexer")
+
+	// load intermediate
+	i.coinCacheMutex.Lock(false)
+	for _, tx := range block.Transactions {
+		for _, op := range tx.Operations {
+			if op.CoinChange == nil {
+				continue
+			}
+
+			// We only care about newly accessible coins.
+			if op.CoinChange.CoinAction != types.CoinCreated {
+				continue
+			}
+
+			i.coinCache[op.CoinChange.CoinIdentifier.Identifier] = &types.AccountCoin{
+				Account: op.Account,
+				Coin: &types.Coin{
+					CoinIdentifier: op.CoinChange.CoinIdentifier,
+					Amount:         op.Amount,
+				},
+			}
+		}
+	}
+	i.coinCacheMutex.Unlock()
+
+	// Update so that lookers know it exists
+	i.seenMutex.Lock()
+	i.seen++
+	i.seenMutex.Unlock()
+
+	err := i.blockStorage.SeeBlock(ctx, block)
+	if err != nil {
+		return fmt.Errorf(
+			"%w: unable to encounter block to storage %s:%d",
+			err,
+			block.BlockIdentifier.Hash,
+			block.BlockIdentifier.Index,
+		)
+	}
+
+	ops := 0
+
+	// Close channels of all blocks waiting.
+	i.waiter.Lock()
+	for _, transaction := range block.Transactions {
+		ops += len(transaction.Operations)
+		txHash := transaction.TransactionIdentifier.Hash
+		val, ok := i.waiter.Get(txHash, false)
+		if !ok {
+			continue
+		}
+
+		if val.channelClosed {
+			logger.Debugw(
+				"channel already closed",
+				"hash", block.BlockIdentifier.Hash,
+				"index", block.BlockIdentifier.Index,
+				"channel", txHash,
+			)
+			continue
+		}
+
+		// Closing channel will cause all listeners to continue
+		val.channelClosed = true
+		close(val.channel)
+	}
+	i.waiter.Unlock()
+
+	logger.Debugw(
+		"block seen",
+		"hash", block.BlockIdentifier.Hash,
+		"index", block.BlockIdentifier.Index,
+	)
+
+	return nil
+}
+
 // BlockRemoved is called by the syncer when a block is removed.
 func (i *Indexer) BlockRemoved(
 	ctx context.Context,
@@ -424,6 +534,7 @@ func (i *Indexer) findCoin(
 	coinIdentifier string,
 ) (*types.Coin, *types.AccountIdentifier, error) {
 	for ctx.Err() == nil {
+		startSeen := i.seen
 		databaseTransaction := i.database.ReadTransaction(ctx)
 		defer databaseTransaction.Discard(ctx)
 
@@ -461,6 +572,14 @@ func (i *Indexer) findCoin(
 			return nil, nil, fmt.Errorf("%w: unable to lookup coin %s", err, coinIdentifier)
 		}
 
+		// Check seen CoinCache
+		i.coinCacheMutex.Lock(false)
+		accCoin, ok := i.coinCache[coinIdentifier]
+		i.coinCacheMutex.Unlock()
+		if ok {
+			return accCoin.Coin, accCoin.Account, nil
+		}
+
 		// Locking here prevents us from adding sending any done
 		// signals while we are determining whether or not to add
 		// to the WaitTable.
@@ -470,12 +589,13 @@ func (i *Indexer) findCoin(
 		// we created our databaseTransaction.
 		currHeadBlock, err := i.blockStorage.GetHeadBlockIdentifier(ctx)
 		if err != nil {
+			i.waiter.Unlock()
 			return nil, nil, fmt.Errorf("%w: unable to get head block identifier", err)
 		}
 
 		// If the block has changed, we try to look up the transaction
 		// again.
-		if types.Hash(currHeadBlock) != types.Hash(coinHeadBlock) {
+		if types.Hash(currHeadBlock) != types.Hash(coinHeadBlock) || i.seen != startSeen {
 			i.waiter.Unlock()
 			continue
 		}
diff --git a/services/network_service_test.go b/services/network_service_test.go
index ca3ce36b..74d238ca 100644
--- a/services/network_service_test.go
+++ b/services/network_service_test.go
@@ -27,7 +27,7 @@ import (
 )
 
 var (
-	middlewareVersion     = "0.0.8"
+	middlewareVersion     = "0.0.9"
 	defaultNetworkOptions = &types.NetworkOptionsResponse{
 		Version: &types.Version{
 			RosettaVersion:    types.RosettaAPIVersion,
diff --git a/services/types.go b/services/types.go
index 2948b806..1937885d 100644
--- a/services/types.go
+++ b/services/types.go
@@ -45,7 +45,7 @@ const (
 	// variable instead of a constant because
 	// we typically need the pointer of this
 	// value.
-	MiddlewareVersion = "0.0.8"
+	MiddlewareVersion = "0.0.9"
 )
 
 // Client is used by the servicers to get Peer information