@@ -257,3 +257,9 @@ EthAddr:   ethAddr,
 	}
 	return &a, nil
 }
+
+// IdxNonce is a pair of Idx and Nonce representing an account
+type IdxNonce struct {
+	Idx   Idx   `db:"idx"`
+	Nonce Nonce `db:"nonce"`
+}

@@ -35,13 +35,27 @@ }
 
 // Coordinator is the coordinator specific configuration.
 type Coordinator struct {
+	// ForgerAddress is the address under which this coordinator is forging
 	ForgerAddress     ethCommon.Address `validate:"required"`
 	ForgeLoopInterval Duration          `validate:"required"`
-	ConfirmBlocks     int64             `validate:"required"`
-	L2DB              struct {
+	// ConfirmBlocks is the number of confirmation blocks to wait for sent
+	// ethereum transactions before forgetting about them
+	ConfirmBlocks int64 `validate:"required"`
+	// L1BatchTimeoutPerc is the portion of the range before the L1Batch
+	// timeout that will trigger a schedule to forge an L1Batch
+	L1BatchTimeoutPerc float64 `validate:"required"`
+	L2DB               struct {
 		SafetyPeriod common.BatchNum `validate:"required"`
 		MaxTxs       uint32          `validate:"required"`
 		TTL          Duration        `validate:"required"`
+		// PurgeBatchDelay is the delay between batches to purge outdated transactions
+		PurgeBatchDelay int64 `validate:"required"`
+		// InvalidateBatchDelay is the delay between batches to mark invalid transactions
+		InvalidateBatchDelay int64 `validate:"required"`
+		// PurgeBlockDelay is the delay between blocks to purge outdated transactions
+		PurgeBlockDelay int64 `validate:"required"`
+		// InvalidateBlockDelay is the delay between blocks to mark invalid transactions
+		InvalidateBlockDelay int64 `validate:"required"`
 	} `validate:"required"`
 	TxSelector struct {
 		Path string `validate:"required"`
@@ -56,10 +70,24 @@ DeployGasLimit      uint64   `validate:"required"`
 		GasPriceDiv         uint64   `validate:"required"`
 		ReceiptTimeout      Duration `validate:"required"`
 		IntervalReceiptLoop Duration `validate:"required"`
+		// IntervalCheckLoop is the waiting interval between receipt
+		// checks of ethereum transactions in the TxManager
+		IntervalCheckLoop Duration `validate:"required"`
+		// Attempts is the number of attempts to do an eth client RPC
+		// call before giving up
+		Attempts int `validate:"required"`
+		// AttemptsDelay is delay between attempts do do an eth client
+		// RPC call
+		AttemptsDelay Duration `validate:"required"`
 	} `validate:"required"`
 	API struct {
 		Coordinator bool
 	} `validate:"required"`
+	Debug struct {
+		// BatchPath if set, specifies the path where batchInfo is stored
+		// in JSON in every step/update of the pipeline
+		BatchPath string
+	}
 }
 
 // Node is the hermez node configuration.

@@ -45,6 +45,7 @@ TxManagerCheckInterval time.Duration
 	// DebugBatchPath if set, specifies the path where batchInfo is stored
 	// in JSON in every step/update of the pipeline
 	DebugBatchPath string
+	Purger         PurgerCfg
 }
 
 func (c *Config) debugBatchStore(batchInfo *BatchInfo) {
@@ -79,6 +80,7 @@ cancel context.CancelFunc
 
 	pipeline *Pipeline
 
+	purger    *Purger
 	txManager *TxManager
 }
 
@@ -101,6 +103,14 @@ }
 	if cfg.EthClientAttempts < 1 {
 		return nil, tracerr.Wrap(fmt.Errorf("invalid value for Config.EthClientAttempts (%v < 1)",
 			cfg.EthClientAttempts))
+	}
+
+	purger := Purger{
+		cfg:                 cfg.Purger,
+		lastPurgeBlock:      0,
+		lastPurgeBatch:      0,
+		lastInvalidateBlock: 0,
+		lastInvalidateBatch: 0,
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -117,6 +127,8 @@ l2DB:         l2DB,
 		txSelector:   txSelector,
 		batchBuilder: batchBuilder,
 
+		purger: &purger,
+
 		// ethClient: ethClient,
 
 		msgCh: make(chan interface{}),
@@ -130,16 +142,18 @@ return &c, nil
 }
 
 func (c *Coordinator) newPipeline(ctx context.Context) (*Pipeline, error) {
-	return NewPipeline(ctx, c.cfg, c.historyDB, c.l2DB,
-		c.txSelector, c.batchBuilder, c.txManager, c.provers, &c.consts)
+	return NewPipeline(ctx, c.cfg, c.historyDB, c.l2DB, c.txSelector,
+		c.batchBuilder, c.purger, c.txManager, c.provers, &c.consts)
 }
 
-// MsgSyncStats indicates an update to the Synchronizer stats
-type MsgSyncStats struct {
-	Stats synchronizer.Stats
+// MsgSyncBlock indicates an update to the Synchronizer stats
+type MsgSyncBlock struct {
+	Stats   synchronizer.Stats
+	Batches []common.BatchData
 }
 
 // MsgSyncSCVars indicates an update to Smart Contract Vars
+// TODO: Move this to MsgSyncBlock and remove MsgSyncSCVars
 type MsgSyncSCVars struct {
 	Rollup   *common.RollupVariables
 	Auction  *common.AuctionVariables
@@ -186,7 +200,9 @@ }
 	return false
 }
 
-func (c *Coordinator) handleMsgSyncStats(ctx context.Context, stats *synchronizer.Stats) error {
+func (c *Coordinator) handleMsgSyncBlock(ctx context.Context, msg *MsgSyncBlock) error {
+	stats := &msg.Stats
+	// batches := msg.Batches
 	if !stats.Synced() {
 		return nil
 	}
@@ -218,6 +234,29 @@ c.pipeline.Stop(c.ctx)
 			c.pipeline = nil
 		}
 	}
+	if c.pipeline == nil {
+		// Mark invalid in Pool due to forged L2Txs
+		// for _, batch := range batches {
+		// 	if err := poolMarkInvalidOldNoncesFromL2Txs(c.l2DB,
+		// 		idxsNonceFromL2Txs(batch.L2Txs), batch.Batch.BatchNum); err != nil {
+		// 		return err
+		// 	}
+		// }
+		if c.purger.CanInvalidate(stats.Sync.LastBlock.Num, stats.Sync.LastBatch) {
+			if err := c.txSelector.Reset(common.BatchNum(stats.Sync.LastBatch)); err != nil {
+				return err
+			}
+		}
+		_, err := c.purger.InvalidateMaybe(c.l2DB, c.txSelector.LocalAccountsDB(),
+			stats.Sync.LastBlock.Num, stats.Sync.LastBatch)
+		if err != nil {
+			return err
+		}
+		_, err = c.purger.PurgeMaybe(c.l2DB, stats.Sync.LastBlock.Num, stats.Sync.LastBatch)
+		if err != nil {
+			return err
+		}
+	}
 	return nil
 }
 
@@ -254,12 +293,11 @@ c.wg.Done()
 				return
 			case msg := <-c.msgCh:
 				switch msg := msg.(type) {
-				case MsgSyncStats:
-					stats := msg.Stats
-					if err := c.handleMsgSyncStats(c.ctx, &stats); common.IsErrDone(err) {
+				case MsgSyncBlock:
+					if err := c.handleMsgSyncBlock(c.ctx, &msg); common.IsErrDone(err) {
 						continue
 					} else if err != nil {
-						log.Errorw("Coordinator.handleMsgSyncStats error", "err", err)
+						log.Errorw("Coordinator.handleMsgSyncBlock error", "err", err)
 						continue
 					}
 				case MsgSyncReorg:
@@ -522,6 +560,7 @@ historyDB    *historydb.HistoryDB
 	l2DB         *l2db.L2DB
 	txSelector   *txselector.TxSelector
 	batchBuilder *batchbuilder.BatchBuilder
+	purger       *Purger
 
 	stats   synchronizer.Stats
 	statsCh chan synchronizer.Stats
@@ -538,6 +577,7 @@ historyDB *historydb.HistoryDB,
 	l2DB *l2db.L2DB,
 	txSelector *txselector.TxSelector,
 	batchBuilder *batchbuilder.BatchBuilder,
+	purger *Purger,
 	txManager *TxManager,
 	provers []prover.Client,
 	scConsts *synchronizer.SCConsts,
@@ -563,6 +603,7 @@ txSelector:   txSelector,
 		batchBuilder: batchBuilder,
 		provers:      provers,
 		proversPool:  proversPool,
+		purger:       purger,
 		txManager:    txManager,
 		consts:       *scConsts,
 		statsCh:      make(chan synchronizer.Stats, queueLen),
@@ -679,7 +720,12 @@ // forgeSendServerProof the next batch, wait for a proof server to be available and send the
 // circuit inputs to the proof server.
 func (p *Pipeline) forgeSendServerProof(ctx context.Context, batchNum common.BatchNum) (*BatchInfo, error) {
 	// remove transactions from the pool that have been there for too long
-	err := p.l2DB.Purge(common.BatchNum(p.stats.Sync.LastBatch))
+	_, err := p.purger.InvalidateMaybe(p.l2DB, p.txSelector.LocalAccountsDB(),
+		p.stats.Sync.LastBlock.Num, int64(batchNum))
+	if err != nil {
+		return nil, err
+	}
+	_, err = p.purger.PurgeMaybe(p.l2DB, p.stats.Sync.LastBlock.Num, int64(batchNum))
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
@@ -721,11 +767,11 @@ if err := p.l2DB.StartForging(l2TxsIDs(batchInfo.L2Txs), batchInfo.BatchNum); err != nil {
 		return nil, tracerr.Wrap(err)
 	}
 
-	// Run purger to invalidate transactions that become invalid beause of
+	// Invalidate transactions that become invalid beause of
 	// the poolL2Txs selected.  Will mark as invalid the txs that have a
 	// (fromIdx, nonce) which already appears in the selected txs (includes
 	// all the nonces smaller than the current one)
-	err = p.purgeInvalidDueToL2TxsSelection(poolL2Txs)
+	err = poolMarkInvalidOldNoncesFromL2Txs(p.l2DB, idxsNonceFromPoolL2Txs(poolL2Txs), batchInfo.BatchNum)
 	if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
@@ -782,10 +828,6 @@ batchInfo.ForgeBatchArgs = p.prepareForgeBatchArgs(batchInfo)
 	batchInfo.TxStatus = TxStatusPending
 	p.cfg.debugBatchStore(batchInfo)
 	return nil
-}
-
-func (p *Pipeline) purgeInvalidDueToL2TxsSelection(l2Txs []common.PoolL2Tx) error {
-	return nil // TODO
 }
 
 func (p *Pipeline) shouldL1L2Batch() bool {

@@ -79,28 +79,29 @@ nLevels := 32
 
 	var err error
 	syncDBPath, err = ioutil.TempDir("", "tmpSyncDB")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	deleteme = append(deleteme, syncDBPath)
 	syncSdb, err := statedb.NewStateDB(syncDBPath, statedb.TypeSynchronizer, nLevels)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
-	require.Nil(t, err)
+	require.NoError(t, err)
+	test.WipeDB(db)
 	l2DB := l2db.NewL2DB(db, 10, 100, 24*time.Hour)
 	historyDB := historydb.NewHistoryDB(db)
 
 	txSelDBPath, err = ioutil.TempDir("", "tmpTxSelDB")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	deleteme = append(deleteme, txSelDBPath)
 	txsel, err := txselector.NewTxSelector(txSelDBPath, syncSdb, l2DB, 10, 10, 10)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	batchBuilderDBPath, err = ioutil.TempDir("", "tmpBatchBuilderDB")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	deleteme = append(deleteme, batchBuilderDBPath)
 	bb, err := batchbuilder.NewBatchBuilder(batchBuilderDBPath, syncSdb, nil, 0, uint64(nLevels))
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	// l1Txs, coordinatorL1Txs, poolL2Txs := test.GenerateTestTxsFromSet(t, test.SetTest0)
 
@@ -124,7 +125,7 @@ func newTestCoordinator(t *testing.T, forgerAddr ethCommon.Address, ethClient *test.Client, ethClientSetup *test.ClientSetup) *Coordinator {
 	historyDB, l2DB, txsel, bb := newTestModules(t)
 
 	debugBatchPath, err := ioutil.TempDir("", "tmpDebugBatch")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	deleteme = append(deleteme, debugBatchPath)
 
 	conf := Config{
@@ -150,7 +151,7 @@ WDelayer: *ethClientSetup.WDelayerVariables,
 	}
 	coord, err := NewCoordinator(conf, historyDB, l2DB, txsel, bb, serverProofs,
 		ethClient, scConsts, initSCVars)
-	require.Nil(t, err)
+	require.NoError(t, err)
 	return coord
 }
 
@@ -165,11 +166,11 @@ coord := newTestCoordinator(t, forger, ethClient, ethClientSetup)
 
 	// Bid for slot 2 and 4
 	_, err := ethClient.AuctionSetCoordinator(forger, "https://foo.bar")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	_, err = ethClient.AuctionBidSimple(2, big.NewInt(9999))
-	require.Nil(t, err)
+	require.NoError(t, err)
 	_, err = ethClient.AuctionBidSimple(4, big.NewInt(9999))
-	require.Nil(t, err)
+	require.NoError(t, err)
 
 	coord.Start()
 	time.Sleep(1 * time.Second)
@@ -177,9 +178,9 @@
 	waitForSlot := func(slot int64) {
 		for {
 			blockNum, err := ethClient.EthLastBlock()
-			require.Nil(t, err)
+			require.NoError(t, err)
 			nextBlockSlot, err := ethClient.AuctionGetSlotNumber(blockNum + 1)
-			require.Nil(t, err)
+			require.NoError(t, err)
 			if nextBlockSlot == slot {
 				break
 			}
@@ -191,7 +192,7 @@ stats.Sync.LastBlock = stats.Eth.LastBlock
 			stats.Eth.LastBatch = ethClient.CtlLastForgedBatch()
 			stats.Sync.LastBatch = stats.Eth.LastBatch
 			canForge, err := ethClient.AuctionCanForge(forger, blockNum+1)
-			require.Nil(t, err)
+			require.NoError(t, err)
 			if canForge {
 				// fmt.Println("DBG canForge")
 				stats.Sync.Auction.CurrentSlot.Forger = forger
@@ -207,7 +208,7 @@ err = pebbleMakeCheckpoint(source, dest)
 					require.NoError(t, err)
 				}
 			}
-			coord.SendMsg(MsgSyncStats{
+			coord.SendMsg(MsgSyncBlock{
 				Stats: stats,
 			})
 		}
@@ -254,16 +255,16 @@ var timer timer
 	ethClient := test.NewClient(true, &timer, &bidder, ethClientSetup)
 	coord := newTestCoordinator(t, forger, ethClient, ethClientSetup)
 	_, err := ethClient.AuctionSetCoordinator(forger, "https://foo.bar")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	_, err = ethClient.AuctionBidSimple(2, big.NewInt(9999))
-	require.Nil(t, err)
+	require.NoError(t, err)
 
 	bootCoord := newTestCoordinator(t, bootForger, ethClient, ethClientSetup)
 
 	assert.Equal(t, forger, coord.cfg.ForgerAddress)
 	assert.Equal(t, bootForger, bootCoord.cfg.ForgerAddress)
 	ethBootCoord, err := ethClient.AuctionGetBootCoordinator()
-	require.Nil(t, err)
+	require.NoError(t, err)
 	assert.Equal(t, &bootForger, ethBootCoord)
 
 	var stats synchronizer.Stats
@@ -300,11 +301,12 @@ var timer timer
 	ethClient := test.NewClient(true, &timer, &bidder, ethClientSetup)
 	coord := newTestCoordinator(t, forger, ethClient, ethClientSetup)
 	_, err := ethClient.AuctionSetCoordinator(forger, "https://foo.bar")
-	require.Nil(t, err)
+	require.NoError(t, err)
 	_, err = ethClient.AuctionBidSimple(2, big.NewInt(9999))
-	require.Nil(t, err)
+	require.NoError(t, err)
 
-	var stats synchronizer.Stats
+	var msg MsgSyncBlock
+	stats := &msg.Stats
 	ctx := context.Background()
 
 	// Slot 0.  No bid, so the winner is the boot coordinator
@@ -312,8 +314,8 @@ // pipelineStarted: false -> false
 	stats.Eth.LastBlock.Num = ethClientSetup.AuctionConstants.GenesisBlockNum
 	stats.Sync.LastBlock = stats.Eth.LastBlock
 	stats.Sync.Auction.CurrentSlot.Forger = bootForger
-	assert.Equal(t, false, coord.canForge(&stats))
-	require.Nil(t, coord.handleMsgSyncStats(ctx, &stats))
+	assert.Equal(t, false, coord.canForge(stats))
+	require.NoError(t, coord.handleMsgSyncBlock(ctx, &msg))
 	assert.Nil(t, coord.pipeline)
 
 	// Slot 0.  No bid, and we reach the deadline, so anyone can forge
@@ -322,8 +324,8 @@ stats.Eth.LastBlock.Num = ethClientSetup.AuctionConstants.GenesisBlockNum +
 		int64(ethClientSetup.AuctionVariables.SlotDeadline)
 	stats.Sync.LastBlock = stats.Eth.LastBlock
 	stats.Sync.Auction.CurrentSlot.Forger = bootForger
-	assert.Equal(t, true, coord.canForge(&stats))
-	require.Nil(t, coord.handleMsgSyncStats(ctx, &stats))
+	assert.Equal(t, true, coord.canForge(stats))
+	require.NoError(t, coord.handleMsgSyncBlock(ctx, &msg))
 	assert.NotNil(t, coord.pipeline)
 
 	// Slot 0.  No bid, and we reach the deadline, so anyone can forge
@@ -332,8 +334,8 @@ stats.Eth.LastBlock.Num = ethClientSetup.AuctionConstants.GenesisBlockNum +
 		int64(ethClientSetup.AuctionVariables.SlotDeadline) + 1
 	stats.Sync.LastBlock = stats.Eth.LastBlock
 	stats.Sync.Auction.CurrentSlot.Forger = bootForger
-	assert.Equal(t, true, coord.canForge(&stats))
-	require.Nil(t, coord.handleMsgSyncStats(ctx, &stats))
+	assert.Equal(t, true, coord.canForge(stats))
+	require.NoError(t, coord.handleMsgSyncBlock(ctx, &msg))
 	assert.NotNil(t, coord.pipeline)
 
 	// Slot 0. No bid, so the winner is the boot coordinator
@@ -342,8 +344,8 @@ stats.Eth.LastBlock.Num = ethClientSetup.AuctionConstants.GenesisBlockNum +
 		1*int64(ethClientSetup.AuctionConstants.BlocksPerSlot)
 	stats.Sync.LastBlock = stats.Eth.LastBlock
 	stats.Sync.Auction.CurrentSlot.Forger = bootForger
-	assert.Equal(t, false, coord.canForge(&stats))
-	require.Nil(t, coord.handleMsgSyncStats(ctx, &stats))
+	assert.Equal(t, false, coord.canForge(stats))
+	require.NoError(t, coord.handleMsgSyncBlock(ctx, &msg))
 	assert.Nil(t, coord.pipeline)
 }
 

@@ -0,0 +1,152 @@
+package coordinator
+
+import (
+	"fmt"
+
+	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/hermez-node/db/l2db"
+	"github.com/hermeznetwork/hermez-node/db/statedb"
+	"github.com/hermeznetwork/hermez-node/log"
+	"github.com/hermeznetwork/tracerr"
+	"github.com/iden3/go-merkletree/db"
+)
+
+// PurgerCfg is the purger configuration
+type PurgerCfg struct {
+	// PurgeBatchDelay is the delay between batches to purge outdated transactions
+	PurgeBatchDelay int64
+	// InvalidateBatchDelay is the delay between batches to mark invalid transactions
+	InvalidateBatchDelay int64
+	// PurgeBlockDelay is the delay between blocks to purge outdated transactions
+	PurgeBlockDelay int64
+	// InvalidateBlockDelay is the delay between blocks to mark invalid transactions
+	InvalidateBlockDelay int64
+}
+
+// Purger manages cleanup of transactions in the pool
+type Purger struct {
+	cfg                 PurgerCfg
+	lastPurgeBlock      int64
+	lastPurgeBatch      int64
+	lastInvalidateBlock int64
+	lastInvalidateBatch int64
+}
+
+// CanPurge returns true if it's a good time to purge according to the
+// configuration
+func (p *Purger) CanPurge(blockNum, batchNum int64) bool {
+	if blockNum > p.lastPurgeBlock+p.cfg.PurgeBlockDelay {
+		return true
+	}
+	if batchNum > p.lastPurgeBatch+p.cfg.PurgeBatchDelay {
+		return true
+	}
+	return false
+}
+
+// CanInvalidate returns true if it's a good time to invalidate according to
+// the configuration
+func (p *Purger) CanInvalidate(blockNum, batchNum int64) bool {
+	if blockNum > p.lastInvalidateBlock+p.cfg.InvalidateBlockDelay {
+		return true
+	}
+	if batchNum > p.lastInvalidateBatch+p.cfg.InvalidateBatchDelay {
+		return true
+	}
+	return false
+}
+
+// PurgeMaybe purges txs if it's a good time to do so
+func (p *Purger) PurgeMaybe(l2DB *l2db.L2DB, blockNum, batchNum int64) (bool, error) {
+	if !p.CanPurge(blockNum, batchNum) {
+		return false, nil
+	}
+	p.lastPurgeBlock = blockNum
+	p.lastPurgeBatch = batchNum
+	log.Debugw("Purger: purging l2txs in pool", "block", blockNum, "batch", batchNum)
+	err := l2DB.Purge(common.BatchNum(batchNum))
+	return true, tracerr.Wrap(err)
+}
+
+// InvalidateMaybe invalidates txs if it's a good time to do so
+func (p *Purger) InvalidateMaybe(l2DB *l2db.L2DB, stateDB *statedb.LocalStateDB,
+	blockNum, batchNum int64) (bool, error) {
+	if !p.CanInvalidate(blockNum, batchNum) {
+		return false, nil
+	}
+	p.lastInvalidateBlock = blockNum
+	p.lastInvalidateBatch = batchNum
+	log.Debugw("Purger: invalidating l2txs in pool", "block", blockNum, "batch", batchNum)
+	err := poolMarkInvalidOldNonces(l2DB, stateDB, common.BatchNum(batchNum))
+	return true, err
+}
+
+//nolint:unused,deadcode
+func idxsNonceFromL2Txs(txs []common.L2Tx) []common.IdxNonce {
+	idxNonceMap := map[common.Idx]common.Nonce{}
+	for _, tx := range txs {
+		if nonce, ok := idxNonceMap[tx.FromIdx]; !ok {
+			idxNonceMap[tx.FromIdx] = tx.Nonce
+		} else if tx.Nonce > nonce {
+			idxNonceMap[tx.FromIdx] = tx.Nonce
+		}
+	}
+	idxsNonce := make([]common.IdxNonce, 0, len(idxNonceMap))
+	for idx, nonce := range idxNonceMap {
+		idxsNonce = append(idxsNonce, common.IdxNonce{Idx: idx, Nonce: nonce})
+	}
+	return idxsNonce
+}
+
+func idxsNonceFromPoolL2Txs(txs []common.PoolL2Tx) []common.IdxNonce {
+	idxNonceMap := map[common.Idx]common.Nonce{}
+	for _, tx := range txs {
+		if nonce, ok := idxNonceMap[tx.FromIdx]; !ok {
+			idxNonceMap[tx.FromIdx] = tx.Nonce
+		} else if tx.Nonce > nonce {
+			idxNonceMap[tx.FromIdx] = tx.Nonce
+		}
+	}
+	idxsNonce := make([]common.IdxNonce, 0, len(idxNonceMap))
+	for idx, nonce := range idxNonceMap {
+		idxsNonce = append(idxsNonce, common.IdxNonce{Idx: idx, Nonce: nonce})
+	}
+	return idxsNonce
+}
+
+// poolMarkInvalidOldNoncesFromL2Txs marks as invalid the txs in the pool that
+// contain nonces equal or older to the highest nonce used in a forged l2Tx for
+// the
+// corresponding sender account
+func poolMarkInvalidOldNoncesFromL2Txs(l2DB *l2db.L2DB,
+	idxsNonce []common.IdxNonce, batchNum common.BatchNum) error {
+	return l2DB.CheckNonces(idxsNonce, batchNum)
+}
+
+// poolMarkInvalidOldNonces marks as invalid txs in the pool that contain
+// nonces equal or older to the nonce of the corresponding sender account
+func poolMarkInvalidOldNonces(l2DB *l2db.L2DB, stateDB *statedb.LocalStateDB,
+	batchNum common.BatchNum) error {
+	idxs, err := l2DB.GetPendingUniqueFromIdxs()
+	if err != nil {
+		return err
+	}
+	idxsNonce := make([]common.IdxNonce, len(idxs))
+	lastIdx, err := stateDB.GetIdx()
+	if err != nil {
+		return err
+	}
+	for i, idx := range idxs {
+		acc, err := stateDB.GetAccount(idx)
+		if err != nil {
+			if tracerr.Unwrap(err) != db.ErrNotFound {
+				return err
+			} else if idx <= lastIdx {
+				return fmt.Errorf("account with idx %v not found: %w", idx, err)
+			}
+		}
+		idxsNonce[i].Idx = idx
+		idxsNonce[i].Nonce = acc.Nonce
+	}
+	return l2DB.CheckNonces(idxsNonce, batchNum)
+}

@@ -0,0 +1,3 @@
+package coordinator
+
+// TODO: Test purger functions

@@ -1,6 +1,7 @@
 package l2db
 
 import (
+	"fmt"
 	"math/big"
 	"time"
 
@@ -242,38 +243,52 @@ _, err = l2db.db.Exec(query, args...)
 	return tracerr.Wrap(err)
 }
 
-// CheckNonces invalidate txs with nonces that are smaller or equal than their respective accounts nonces.
-// The state of the affected txs will be changed from Pending -> Invalid
-func (l2db *L2DB) CheckNonces(updatedAccounts []common.Account, batchNum common.BatchNum) (err error) {
-	if len(updatedAccounts) == 0 {
-		return nil
-	}
-	txn, err := l2db.db.Beginx()
+// GetPendingUniqueFromIdxs returns from all the pending transactions, the set
+// of unique FromIdx
+func (l2db *L2DB) GetPendingUniqueFromIdxs() ([]common.Idx, error) {
+	var idxs []common.Idx
+	rows, err := l2db.db.Query(`SELECT DISTINCT from_idx FROM tx_pool
+		WHERE state = $1;`, common.PoolL2TxStatePending)
 	if err != nil {
-		return tracerr.Wrap(err)
+		return nil, tracerr.Wrap(err)
 	}
-	defer func() {
-		// Rollback the transaction if there was an error.
-		if err != nil {
-			db.Rollback(txn)
-		}
-	}()
-	for i := 0; i < len(updatedAccounts); i++ {
-		_, err = txn.Exec(
-			`UPDATE tx_pool
-			SET state = $1, batch_num = $2
-			WHERE state = $3 AND from_idx = $4 AND nonce <= $5;`,
-			common.PoolL2TxStateInvalid,
-			batchNum,
-			common.PoolL2TxStatePending,
-			updatedAccounts[i].Idx,
-			updatedAccounts[i].Nonce,
-		)
+	var idx common.Idx
+	for rows.Next() {
+		err = rows.Scan(&idx)
 		if err != nil {
-			return tracerr.Wrap(err)
+			return nil, tracerr.Wrap(err)
 		}
+		idxs = append(idxs, idx)
 	}
-	return tracerr.Wrap(txn.Commit())
+	return idxs, nil
+}
+
+var checkNoncesQuery = fmt.Sprintf(`
+		UPDATE tx_pool SET
+			state = '%s',
+			batch_num = %%d
+		FROM (VALUES
+			(NULL::::BIGINT, NULL::::BIGINT),
+			(:idx, :nonce)
+		) as updated_acc (idx, nonce)
+		WHERE tx_pool.from_idx = updated_acc.idx AND tx_pool.nonce <= updated_acc.nonce;
+	`, common.PoolL2TxStateInvalid)
+
+// CheckNonces invalidate txs with nonces that are smaller or equal than their
+// respective accounts nonces.  The state of the affected txs will be changed
+// from Pending to Invalid
+func (l2db *L2DB) CheckNonces(updatedAccounts []common.IdxNonce, batchNum common.BatchNum) (err error) {
+	if len(updatedAccounts) == 0 {
+		return nil
+	}
+	// Fill the batch_num in the query with Sprintf because we are using a
+	// named query which works with slices, and doens't handle an extra
+	// individual argument.
+	query := fmt.Sprintf(checkNoncesQuery, batchNum)
+	if _, err := sqlx.NamedQuery(l2db.db, query, updatedAccounts); err != nil {
+		return tracerr.Wrap(err)
+	}
+	return nil
 }
 
 // Reorg updates the state of txs that were updated in a batch that has been discarted due to a blockchain reorg.

@@ -334,12 +334,13 @@ }
 	poolL2Txs, err := generatePoolL2Txs()
 	assert.NoError(t, err)
 	// Update Accounts currentNonce
-	var updateAccounts []common.Account
+	var updateAccounts []common.IdxNonce
 	const currentNonce = common.Nonce(1)
 	for i := range accs {
-		account := accs[i]
-		account.Nonce = common.Nonce(currentNonce)
-		updateAccounts = append(updateAccounts, account)
+		updateAccounts = append(updateAccounts, common.IdxNonce{
+			Idx:   accs[i].Idx,
+			Nonce: common.Nonce(currentNonce),
+		})
 	}
 	// Add txs to DB
 	var invalidTxIDs []common.TxID

@@ -303,7 +303,7 @@ if err != nil {
 		return tracerr.Wrap(err)
 	}
 	// idx is obtained from the statedb reset
-	s.idx, err = s.getIdx()
+	s.idx, err = s.GetIdx()
 	if err != nil {
 		return tracerr.Wrap(err)
 	}

@@ -1118,9 +1118,9 @@ return
 	}
 }
 
-// getIdx returns the stored Idx from the localStateDB, which is the last Idx
+// GetIdx returns the stored Idx from the localStateDB, which is the last Idx
 // used for an Account in the localStateDB.
-func (s *StateDB) getIdx() (common.Idx, error) {
+func (s *StateDB) GetIdx() (common.Idx, error) {
 	idxBytes, err := s.DB().Get(keyidx)
 	if tracerr.Unwrap(err) == db.ErrNotFound {
 		return 0, nil

@@ -65,8 +65,8 @@ type EthereumConfig struct {
 	CallGasLimit        uint64
 	DeployGasLimit      uint64
 	GasPriceDiv         uint64
-	ReceiptTimeout      time.Duration // in seconds
-	IntervalReceiptLoop time.Duration // in milliseconds
+	ReceiptTimeout      time.Duration
+	IntervalReceiptLoop time.Duration
 }
 
 // EthereumClient is an ethereum client to call Smart Contract methods and check blockchain information.

@@ -170,8 +170,19 @@ }
 
 		coord, err = coordinator.NewCoordinator(
 			coordinator.Config{
-				ForgerAddress: coordCfg.ForgerAddress,
-				ConfirmBlocks: coordCfg.ConfirmBlocks,
+				ForgerAddress:          coordCfg.ForgerAddress,
+				ConfirmBlocks:          coordCfg.ConfirmBlocks,
+				L1BatchTimeoutPerc:     coordCfg.L1BatchTimeoutPerc,
+				EthClientAttempts:      coordCfg.EthClient.Attempts,
+				EthClientAttemptsDelay: coordCfg.EthClient.AttemptsDelay.Duration,
+				TxManagerCheckInterval: coordCfg.EthClient.IntervalCheckLoop.Duration,
+				DebugBatchPath:         coordCfg.Debug.BatchPath,
+				Purger: coordinator.PurgerCfg{
+					PurgeBatchDelay:      coordCfg.L2DB.PurgeBatchDelay,
+					InvalidateBatchDelay: coordCfg.L2DB.InvalidateBatchDelay,
+					PurgeBlockDelay:      coordCfg.L2DB.PurgeBlockDelay,
+					InvalidateBlockDelay: coordCfg.L2DB.InvalidateBlockDelay,
+				},
 			},
 			historyDB,
 			l2DB,
@@ -327,7 +338,9 @@ } else if discarded != nil {
 		// case: reorg
 		log.Infow("Synchronizer.Sync reorg", "discarded", *discarded)
 		if n.mode == ModeCoordinator {
-			n.coord.SendMsg(coordinator.MsgSyncReorg{})
+			n.coord.SendMsg(coordinator.MsgSyncReorg{
+				Stats: *stats,
+			})
 		}
 		if n.nodeAPI != nil {
 			rollup, auction, wDelayer := n.sync.SCVars()
@@ -351,8 +364,9 @@ Auction:  blockData.Auction.Vars,
 					WDelayer: blockData.WDelayer.Vars,
 				})
 			}
-			n.coord.SendMsg(coordinator.MsgSyncStats{
-				Stats: *stats,
+			n.coord.SendMsg(coordinator.MsgSyncBlock{
+				Stats:   *stats,
+				Batches: blockData.Rollup.Batches,
 			})
 		}
 		if n.nodeAPI != nil {

@@ -801,11 +801,16 @@ MaxFeeTx: 64,
 			MaxTx:    512,
 			MaxL1Tx:  64,
 		}
-		processTxsOut, err := s.stateDB.ProcessTxs(ptc, forgeBatchArgs.FeeIdxCoordinator, l1UserTxs,
-			batchData.L1CoordinatorTxs, poolL2Txs)
+		processTxsOut, err := s.stateDB.ProcessTxs(ptc, forgeBatchArgs.FeeIdxCoordinator,
+			l1UserTxs, batchData.L1CoordinatorTxs, poolL2Txs)
 		if err != nil {
 			return nil, tracerr.Wrap(err)
 		}
+		// Set the BatchNum in the forged L1UserTxs
+		for i := range l1UserTxs {
+			l1UserTxs[i].BatchNum = &batchNum
+		}
+		batchData.L1UserTxs = l1UserTxs
 
 		// Set batchNum in exits
 		for i := range processTxsOut.ExitInfos {

@@ -76,7 +76,7 @@ tokenCpy.ItemID = dbToken.ItemID                    // we don't care about ItemID
 		assert.Equal(t, tokenCpy, dbToken)
 	}
 
-	// Check L1UserTxs
+	// Check submitted L1UserTxs
 	assert.Equal(t, len(block.Rollup.L1UserTxs), len(syncBlock.Rollup.L1UserTxs))
 	dbL1UserTxs, err := s.historyDB.GetAllL1UserTxs()
 	require.Nil(t, err)
@@ -85,9 +85,8 @@ // the HistoryDB. Also ignore EffectiveAmount & EffectiveDepositAmount
 	// because this value is set by StateDB.ProcessTxs.
 	for i := range syncBlock.Rollup.L1UserTxs {
 		syncBlock.Rollup.L1UserTxs[i].BatchNum = block.Rollup.L1UserTxs[i].BatchNum
-		syncBlock.Rollup.L1UserTxs[i].EffectiveAmount = block.Rollup.L1UserTxs[i].EffectiveAmount
-		syncBlock.Rollup.L1UserTxs[i].EffectiveDepositAmount =
-			block.Rollup.L1UserTxs[i].EffectiveDepositAmount
+		assert.Nil(t, syncBlock.Rollup.L1UserTxs[i].EffectiveDepositAmount)
+		assert.Nil(t, syncBlock.Rollup.L1UserTxs[i].EffectiveAmount)
 	}
 	assert.Equal(t, block.Rollup.L1UserTxs, syncBlock.Rollup.L1UserTxs)
 	for _, tx := range block.Rollup.L1UserTxs {
@@ -101,8 +100,13 @@ *dbTx = _dbTx
 				break
 			}
 		}
-		tx.EffectiveAmount = tx.Amount
-		tx.EffectiveDepositAmount = tx.DepositAmount
+		// If the tx has been forged in this block, this will be
+		// reflected in the DB, and so the Effective values will be
+		// already set
+		if dbTx.BatchNum != nil {
+			tx.EffectiveAmount = tx.Amount
+			tx.EffectiveDepositAmount = tx.DepositAmount
+		}
 		assert.Equal(t, &tx, dbTx) //nolint:gosec
 	}
 
@@ -137,6 +141,7 @@ assert.Equal(t, batch.CreatedAccounts, syncBatch.CreatedAccounts)
 		batch.Batch.NumAccounts = len(batch.CreatedAccounts)
 
 		// Test field by field to facilitate debugging of errors
+		assert.Equal(t, batch.L1UserTxs, syncBatch.L1UserTxs)
 		assert.Equal(t, batch.L1CoordinatorTxs, syncBatch.L1CoordinatorTxs)
 		assert.Equal(t, batch.L2Txs, syncBatch.L2Txs)
 		// In exit tree, we only check AccountIdx and Balance, because
@@ -152,6 +157,26 @@ assert.Equal(t, batch.Batch, syncBatch.Batch)
 		assert.Equal(t, batch, syncBatch)
 		assert.Equal(t, &batch.Batch, dbBatch) //nolint:gosec
 
+		// Check forged L1UserTxs from DB, and check effective values
+		// in sync output
+		for j, tx := range batch.L1UserTxs {
+			var dbTx *common.L1Tx
+			// Find tx in DB output
+			for _, _dbTx := range dbL1UserTxs {
+				if *tx.BatchNum == *_dbTx.BatchNum &&
+					tx.Position == _dbTx.Position {
+					dbTx = new(common.L1Tx)
+					*dbTx = _dbTx
+					break
+				}
+			}
+			assert.Equal(t, &tx, dbTx) //nolint:gosec
+
+			syncTx := &syncBlock.Rollup.Batches[i].L1UserTxs[j]
+			assert.Equal(t, syncTx.DepositAmount, syncTx.EffectiveDepositAmount)
+			assert.Equal(t, syncTx.Amount, syncTx.EffectiveAmount)
+		}
+
 		// Check L1CoordinatorTxs from DB
 		for _, tx := range batch.L1CoordinatorTxs {
 			var dbTx *common.L1Tx
@@ -295,7 +320,7 @@ require.Nil(t, err)
 	defer assert.Nil(t, os.RemoveAll(dir))
 
 	stateDB, err := statedb.NewStateDB(dir, statedb.TypeSynchronizer, 32)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 
 	// Init History DB
 	pass := os.Getenv("POSTGRES_PASS")
@@ -432,8 +457,10 @@ // Generate extra required data
 	ethAddTokens(blocks, client)
 
 	err = tc.FillBlocksExtra(blocks, &tilCfgExtra)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	tc.FillBlocksL1UserTxsBatchNum(blocks)
+	err = tc.FillBlocksForgedL1UserTxs(blocks)
+	assert.NoError(t, err)
 
 	// Add block data to the smart contracts
 	ethAddBlocks(t, blocks, client, clientSetup)
@@ -459,6 +486,7 @@ assert.Equal(t, int64(3), stats.Eth.LastBlock.Num)
 	assert.Equal(t, int64(2), stats.Sync.LastBlock.Num)
 
 	checkSyncBlock(t, s, 2, &blocks[0], syncBlock)
+
 	// Block 3
 
 	syncBlock, discards, err = s.Sync2(ctx, nil)
@@ -606,7 +634,7 @@ // Generate extra required data
 	ethAddTokens(blocks, client)
 
 	err = tc.FillBlocksExtra(blocks, &tilCfgExtra)
-	assert.Nil(t, err)
+	assert.NoError(t, err)
 	tc.FillBlocksL1UserTxsBatchNum(blocks)
 
 	// Add block data to the smart contracts

@@ -58,6 +58,11 @@ localAccountsDB:  localAccountsDB,
 	}, nil
 }
 
+// LocalAccountsDB returns the LocalStateDB of the TxSelector
+func (txsel *TxSelector) LocalAccountsDB() *statedb.LocalStateDB {
+	return txsel.localAccountsDB
+}
+
 // Reset tells the TxSelector to get it's internal AccountsDB
 // from the required `batchNum`
 func (txsel *TxSelector) Reset(batchNum common.BatchNum) error {