@@ -206,7 +206,7 @@ }
 
 func newTestSynchronizer(t *testing.T, ethClient *test.Client, ethClientSetup *test.ClientSetup,
 	modules modules) *synchronizer.Synchronizer {
-	sync, err := synchronizer.NewSynchronizer(ethClient, modules.historyDB, modules.stateDB,
+	sync, err := synchronizer.NewSynchronizer(ethClient, modules.historyDB, modules.l2DB, modules.stateDB,
 		synchronizer.Config{
 			StatsRefreshPeriod: 0 * time.Second,
 		})

@@ -74,6 +74,16 @@ )
 	return tracerr.Wrap(err)
 }
 
+// AddManyAccountCreationAuth inserts a batch of accounts creation authorization
+// if not exist into the DB
+func (l2db *L2DB) AddManyAccountCreationAuth(auths []common.AccountCreationAuth) error {
+	_, err := sqlx.NamedExec(l2db.dbWrite,
+		`INSERT INTO account_creation_auth (eth_addr, bjj, signature)
+				VALUES (:ethaddr, :bjj, :signature) 
+				ON CONFLICT (eth_addr) DO NOTHING`, auths)
+	return tracerr.Wrap(err)
+}
+
 // GetAccountCreationAuth returns an account creation authorization from the DB
 func (l2db *L2DB) GetAccountCreationAuth(addr ethCommon.Address) (*common.AccountCreationAuth, error) {
 	auth := new(common.AccountCreationAuth)

@@ -725,6 +725,43 @@ assert.Equal(t, 0, offset)
 	}
 }
 
+func TestManyAuth(t *testing.T) {
+	test.WipeDB(l2DB.DB())
+	const nAuths = 5
+	chainID := uint16(0)
+	hermezContractAddr := ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
+	// Generate authorizations
+	genAuths := test.GenAuths(nAuths, chainID, hermezContractAddr)
+	auths := make([]common.AccountCreationAuth, len(genAuths))
+	// Convert to a non-pointer slice
+	for i := 0; i < len(genAuths); i++ {
+		auths[i] = *genAuths[i]
+	}
+
+	// Add a duplicate one to check the not exist condition
+	err := l2DB.AddAccountCreationAuth(genAuths[0])
+	require.NoError(t, err)
+
+	// Add to the DB
+	err = l2DB.AddManyAccountCreationAuth(auths)
+	require.NoError(t, err)
+
+	// Assert the result
+	for i := 0; i < len(auths); i++ {
+		// Fetch from DB
+		auth, err := l2DB.GetAccountCreationAuth(auths[i].EthAddr)
+		require.NoError(t, err)
+		// Check fetched vs generated
+		assert.Equal(t, auths[i].EthAddr, auth.EthAddr)
+		assert.Equal(t, auths[i].BJJ, auth.BJJ)
+		assert.Equal(t, auths[i].Signature, auth.Signature)
+		assert.Equal(t, auths[i].Timestamp.Unix(), auths[i].Timestamp.Unix())
+		nameZone, offset := auths[i].Timestamp.Zone()
+		assert.Equal(t, "UTC", nameZone)
+		assert.Equal(t, 0, offset)
+	}
+}
+
 func TestAddGet(t *testing.T) {
 	err := prepareHistoryDB(historyDB)
 	if err != nil {

@@ -220,7 +220,19 @@ if err != nil {
 		return nil, tracerr.Wrap(err)
 	}
 
-	sync, err := synchronizer.NewSynchronizer(client, historyDB, stateDB, synchronizer.Config{
+	var l2DB *l2db.L2DB
+	if mode == ModeCoordinator {
+		l2DB = l2db.NewL2DB(
+			dbRead, dbWrite,
+			cfg.Coordinator.L2DB.SafetyPeriod,
+			cfg.Coordinator.L2DB.MaxTxs,
+			cfg.Coordinator.L2DB.MinFeeUSD,
+			cfg.Coordinator.L2DB.TTL.Duration,
+			apiConnCon,
+		)
+	}
+
+	sync, err := synchronizer.NewSynchronizer(client, historyDB, l2DB, stateDB, synchronizer.Config{
 		StatsRefreshPeriod: cfg.Synchronizer.StatsRefreshPeriod.Duration,
 		ChainID:            chainIDU16,
 	})
@@ -236,17 +248,7 @@ WDelayer: *sync.WDelayerConstants(),
 	}
 
 	var coord *coordinator.Coordinator
-	var l2DB *l2db.L2DB
 	if mode == ModeCoordinator {
-		l2DB = l2db.NewL2DB(
-			dbRead, dbWrite,
-			cfg.Coordinator.L2DB.SafetyPeriod,
-			cfg.Coordinator.L2DB.MaxTxs,
-			cfg.Coordinator.L2DB.MinFeeUSD,
-			cfg.Coordinator.L2DB.TTL.Duration,
-			apiConnCon,
-		)
-
 		// Unlock FeeAccount EthAddr in the keystore to generate the
 		// account creation authorization
 		if !keyStore.HasAddress(cfg.Coordinator.FeeAccount.Address) {

@@ -11,6 +11,7 @@
 	"github.com/ethereum/go-ethereum"
 	"github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
+	"github.com/hermeznetwork/hermez-node/db/l2db"
 	"github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/hermez-node/eth"
 	"github.com/hermeznetwork/hermez-node/log"
@@ -215,6 +216,7 @@ type Synchronizer struct {
 	ethClient        eth.ClientInterface
 	consts           SCConsts
 	historyDB        *historydb.HistoryDB
+	l2DB             *l2db.L2DB
 	stateDB          *statedb.StateDB
 	cfg              Config
 	initVars         SCVariables
@@ -226,7 +228,7 @@ }
 
 // NewSynchronizer creates a new Synchronizer
 func NewSynchronizer(ethClient eth.ClientInterface, historyDB *historydb.HistoryDB,
-	stateDB *statedb.StateDB, cfg Config) (*Synchronizer, error) {
+	l2DB *l2db.L2DB, stateDB *statedb.StateDB, cfg Config) (*Synchronizer, error) {
 	auctionConstants, err := ethClient.AuctionConstants()
 	if err != nil {
 		return nil, tracerr.Wrap(fmt.Errorf("NewSynchronizer ethClient.AuctionConstants(): %w",
@@ -271,6 +273,7 @@ s := &Synchronizer{
 		ethClient:     ethClient,
 		consts:        consts,
 		historyDB:     historyDB,
+		l2DB:          l2DB,
 		stateDB:       stateDB,
 		cfg:           cfg,
 		initVars:      *initVars,
@@ -657,7 +660,7 @@ hasBatch := false
 	if len(rollupData.Batches) > 0 {
 		hasBatch = true
 	}
-	if err := s.updateCurrentNextSlotIfSync(false, hasBatch); err != nil {
+	if err = s.updateCurrentNextSlotIfSync(false, hasBatch); err != nil {
 		return nil, nil, tracerr.Wrap(err)
 	}
 
@@ -895,6 +898,9 @@ }
 
 			position = len(l1UserTxs)
 		}
+
+		l1TxsAuth := make([]common.AccountCreationAuth,
+			0, len(forgeBatchArgs.L1CoordinatorTxsAuths))
 		// Get L1 Coordinator Txs
 		for i := range forgeBatchArgs.L1CoordinatorTxs {
 			l1CoordinatorTx := forgeBatchArgs.L1CoordinatorTxs[i]
@@ -910,7 +916,28 @@ }
 
 			batchData.L1CoordinatorTxs = append(batchData.L1CoordinatorTxs, *l1Tx)
 			position++
+
+			// Create a slice of account creation auth to be
+			// inserted later if not exists
+			if l1CoordinatorTx.FromEthAddr != common.RollupConstEthAddressInternalOnly {
+				l1CoordinatorTxAuth := forgeBatchArgs.L1CoordinatorTxsAuths[i]
+				l1TxsAuth = append(l1TxsAuth, common.AccountCreationAuth{
+					EthAddr:   l1CoordinatorTx.FromEthAddr,
+					BJJ:       l1CoordinatorTx.FromBJJ,
+					Signature: l1CoordinatorTxAuth,
+				})
+			}
+
 			// fmt.Println("DGB l1coordtx")
+		}
+
+		// Insert the slice of account creation auth
+		// only if the node run as a coordinator
+		if s.l2DB != nil && len(l1TxsAuth) > 0 {
+			err = s.l2DB.AddManyAccountCreationAuth(l1TxsAuth)
+			if err != nil {
+				return nil, tracerr.Wrap(err)
+			}
 		}
 
 		// Insert all the txs forged in this batch (l1UserTxs,

@@ -15,6 +15,7 @@ ethCommon "github.com/ethereum/go-ethereum/common"
 	"github.com/hermeznetwork/hermez-node/common"
 	dbUtils "github.com/hermeznetwork/hermez-node/db"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
+	"github.com/hermeznetwork/hermez-node/db/l2db"
 	"github.com/hermeznetwork/hermez-node/db/statedb"
 	"github.com/hermeznetwork/hermez-node/eth"
 	"github.com/hermeznetwork/hermez-node/test"
@@ -303,7 +304,7 @@ }
 	os.Exit(exitVal)
 }
 
-func newTestModules(t *testing.T) (*statedb.StateDB, *historydb.HistoryDB) {
+func newTestModules(t *testing.T) (*statedb.StateDB, *historydb.HistoryDB, *l2db.L2DB) {
 	// Int State DB
 	dir, err := ioutil.TempDir("", "tmpdb")
 	require.NoError(t, err)
@@ -321,7 +322,10 @@ historyDB := historydb.NewHistoryDB(db, db, nil)
 	// Clear DB
 	test.WipeDB(historyDB.DB())
 
-	return stateDB, historyDB
+	// Init L2 DB
+	l2DB := l2db.NewL2DB(db, db, 10, 100, 0.0, 24*time.Hour, nil)
+
+	return stateDB, historyDB, l2DB
 }
 
 func newBigInt(s string) *big.Int {
@@ -337,7 +341,7 @@ //
 	// Setup
 	//
 
-	stateDB, historyDB := newTestModules(t)
+	stateDB, historyDB, l2DB := newTestModules(t)
 
 	// Init eth client
 	var timer timer
@@ -347,7 +351,7 @@ bootCoordAddr := clientSetup.AuctionVariables.BootCoordinator
 	client := test.NewClient(true, &timer, &ethCommon.Address{}, clientSetup)
 
 	// Create Synchronizer
-	s, err := NewSynchronizer(client, historyDB, stateDB, Config{
+	s, err := NewSynchronizer(client, historyDB, l2DB, stateDB, Config{
 		StatsRefreshPeriod: 0 * time.Second,
 	})
 	require.NoError(t, err)
@@ -727,7 +731,7 @@ assertEqualAccountsHistoryDBStateDB(t, dbAccounts, sdbAccounts)
 }
 
 func TestSyncForgerCommitment(t *testing.T) {
-	stateDB, historyDB := newTestModules(t)
+	stateDB, historyDB, l2DB := newTestModules(t)
 
 	// Init eth client
 	var timer timer
@@ -740,7 +744,7 @@ bootCoordAddr := clientSetup.AuctionVariables.BootCoordinator
 	client := test.NewClient(true, &timer, &ethCommon.Address{}, clientSetup)
 
 	// Create Synchronizer
-	s, err := NewSynchronizer(client, historyDB, stateDB, Config{
+	s, err := NewSynchronizer(client, historyDB, l2DB, stateDB, Config{
 		StatsRefreshPeriod: 0 * time.Second,
 	})
 	require.NoError(t, err)
@@ -840,7 +844,7 @@ stats := s.Stats()
 		require.True(t, stats.Synced())
 		syncCommitment[syncBlock.Block.Num] = stats.Sync.Auction.CurrentSlot.ForgerCommitment
 
-		s2, err := NewSynchronizer(client, historyDB, stateDB, Config{
+		s2, err := NewSynchronizer(client, historyDB, l2DB, stateDB, Config{
 			StatsRefreshPeriod: 0 * time.Second,
 		})
 		require.NoError(t, err)

@@ -1897,12 +1897,16 @@ }
 		}
 		c.CtlSetAddr(auction.Vars.BootCoordinator)
 		for _, batch := range block.Rollup.Batches {
+			auths := make([][]byte, len(batch.L1CoordinatorTxs))
+			for i := range auths {
+				auths[i] = make([]byte, 65)
+			}
 			if _, err := c.RollupForgeBatch(&eth.RollupForgeBatchArgs{
 				NewLastIdx:            batch.Batch.LastIdx,
 				NewStRoot:             batch.Batch.StateRoot,
 				NewExitRoot:           batch.Batch.ExitRoot,
 				L1CoordinatorTxs:      batch.L1CoordinatorTxs,
-				L1CoordinatorTxsAuths: [][]byte{}, // Intentionally empty
+				L1CoordinatorTxsAuths: auths,
 				L2TxsData:             batch.L2Txs,
 				FeeIdxCoordinator:     batch.Batch.FeeIdxsCoordinator,
 				// Circuit selector