diff --git a/common/batch.go b/common/batch.go
index 1d7206f..8a76a93 100644
--- a/common/batch.go
+++ b/common/batch.go
@@ -18,6 +18,7 @@ type Batch struct {
 	CollectedFees map[TokenID]*big.Int `meddler:"fees_collected,json"`
 	StateRoot     *big.Int             `meddler:"state_root,bigint"`
 	NumAccounts   int                  `meddler:"num_accounts"`
+	LastIdx       int64                `meddler:"last_idx"`
 	ExitRoot      *big.Int             `meddler:"exit_root,bigint"`
 	ForgeL1TxsNum *int64               `meddler:"forge_l1_txs_num"` // optional, Only when the batch forges L1 txs. Identifier that corresponds to the group of L1 txs forged in the current batch.
 	SlotNum       int64                `meddler:"slot_num"`         // Slot in which the batch is forged
diff --git a/db/historydb/historydb.go b/db/historydb/historydb.go
index e60a160..b7eae25 100644
--- a/db/historydb/historydb.go
+++ b/db/historydb/historydb.go
@@ -71,6 +71,16 @@ func (hdb *HistoryDB) GetBlock(blockNum int64) (*common.Block, error) {
 	return block, err
 }
 
+// GetAllBlocks retrieve all blocks from the DB
+func (hdb *HistoryDB) GetAllBlocks() ([]common.Block, error) {
+	var blocks []*common.Block
+	err := meddler.QueryAll(
+		hdb.db, &blocks,
+		"SELECT * FROM block;",
+	)
+	return db.SlicePtrsToSlice(blocks).([]common.Block), err
+}
+
 // GetBlocks retrieve blocks from the DB, given a range of block numbers defined by from and to
 func (hdb *HistoryDB) GetBlocks(from, to int64) ([]common.Block, error) {
 	var blocks []*common.Block
@@ -257,6 +267,16 @@ func (hdb *HistoryDB) GetBatchesAPI(
 	}, nil
 }
 
+// GetAllBatches retrieve all batches from the DB
+func (hdb *HistoryDB) GetAllBatches() ([]common.Batch, error) {
+	var batches []*common.Batch
+	err := meddler.QueryAll(
+		hdb.db, &batches,
+		"SELECT * FROM batch;",
+	)
+	return db.SlicePtrsToSlice(batches).([]common.Batch), err
+}
+
 // GetBatches retrieve batches from the DB, given a range of batch numbers defined by from and to
 func (hdb *HistoryDB) GetBatches(from, to common.BatchNum) ([]common.Batch, error) {
 	var batches []*common.Batch
@@ -898,6 +918,19 @@ func (hdb *HistoryDB) GetExits(
 // 	)
 // }
 
+// GetAllL1UserTxs returns all L1UserTxs from the DB
+func (hdb *HistoryDB) GetAllL1UserTxs() ([]common.L1Tx, error) {
+	var txs []*common.L1Tx
+	err := meddler.QueryAll(
+		hdb.db, &txs,
+		`SELECT tx.id, tx.to_forge_l1_txs_num, tx.position, tx.user_origin,
+		tx.from_idx, tx.from_eth_addr, tx.from_bjj, tx.to_idx, tx.token_id, tx.amount,
+		tx.load_amount, tx.eth_block_num, tx.type, tx.batch_num
+		FROM tx WHERE is_l1 = TRUE AND user_origin = TRUE;`,
+	)
+	return db.SlicePtrsToSlice(txs).([]common.L1Tx), err
+}
+
 // GetL1UserTxs gets L1 User Txs to be forged in the L1Batch with toForgeL1TxsNum.
 func (hdb *HistoryDB) GetL1UserTxs(toForgeL1TxsNum int64) ([]common.L1Tx, error) {
 	var txs []*common.L1Tx
diff --git a/db/historydb/historydb_test.go b/db/historydb/historydb_test.go
index 8570415..db2ecfc 100644
--- a/db/historydb/historydb_test.go
+++ b/db/historydb/historydb_test.go
@@ -1,12 +1,12 @@
 package historydb
 
 import (
+	"fmt"
 	"math"
 	"math/big"
 	"os"
 	"testing"
 
-	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/log"
@@ -406,25 +406,10 @@ func TestGetL1UserTxs(t *testing.T) {
 	require.Equal(t, 5, len(blocks[0].L1UserTxs))
 	// fmt.Printf("DBG Blocks: %+v\n", blocks)
 
-	// TODO: Move this logic to `func (tc *TestContext) GenerateBlocks(set string) ([]common.BlockData, error)`
 	toForgeL1TxsNum := int64(1)
-	for i := range blocks {
-		block := &blocks[i]
-		block.Block.EthBlockNum = int64(i)
-		for j := range block.AddedTokens {
-			token := &block.AddedTokens[j]
-			token.EthAddr = ethCommon.BigToAddress(big.NewInt(int64(i*len(blocks) + j)))
-		}
-		for j := range block.L1UserTxs {
-			l1Tx := &block.L1UserTxs[j]
-			l1Tx.UserOrigin = true
-			l1Tx.Position = j
-			l1Tx.ToForgeL1TxsNum = &toForgeL1TxsNum
-		}
-	}
 
 	for i := range blocks {
-		// fmt.Printf("DBG %+v\n", blocks[i])
+		fmt.Printf("DBG %+v\n", blocks[i])
 		// fmt.Printf("DBG Batches %+v\n", blocks[i].Batches)
 		// for _, l1Tx := range blocks[i].L1UserTxs {
 		// 	fmt.Printf("DBG l1UserTx %+v\n", l1Tx)
@@ -433,25 +418,6 @@ func TestGetL1UserTxs(t *testing.T) {
 		require.Nil(t, err)
 	}
 
-	// // TODO: Use til to generate a set with some L1UserTxs
-	// l1Txs := []common.L1Tx{}
-	// l1Tx, err := common.NewL1Tx(&common.L1Tx{
-	// 	ToForgeL1TxsNum: &toForgeL1TxsNum,
-	// 	Position:        0,
-	// 	UserOrigin:      true,
-	// 	FromIdx:         0,
-	// 	FromEthAddr:     ethCommon.Address{}, // ethCommon.HexToAddress("0xff"),
-	// 	FromBJJ:         nil,
-	// 	ToIdx:           0,
-	// 	TokenID:         1,
-	// 	Amount:          big.NewInt(0),
-	// 	LoadAmount:      big.NewInt(0),
-	// })
-	// require.Nil(t, err)
-	// l1Txs = append(l1Txs, *l1Tx)
-
-	// require.Nil(t, historyDB.AddL1Txs(l1Txs))
-
 	l1UserTxs, err := historyDB.GetL1UserTxs(toForgeL1TxsNum)
 	require.Nil(t, err)
 	assert.Equal(t, 5, len(l1UserTxs))
diff --git a/db/migrations/0001.sql b/db/migrations/0001.sql
index 1e6ebfd..fa6646a 100644
--- a/db/migrations/0001.sql
+++ b/db/migrations/0001.sql
@@ -23,6 +23,7 @@ CREATE TABLE batch (
     fees_collected BYTEA NOT NULL,
     state_root BYTEA NOT NULL,
     num_accounts BIGINT NOT NULL,
+    last_idx BIGINT NOT NULL,
     exit_root BYTEA NOT NULL,
     forge_l1_txs_num BIGINT,
     slot_num BIGINT NOT NULL,
diff --git a/synchronizer/synchronizer.go b/synchronizer/synchronizer.go
index ba41677..f24d598 100644
--- a/synchronizer/synchronizer.go
+++ b/synchronizer/synchronizer.go
@@ -3,6 +3,7 @@ package synchronizer
 import (
 	"context"
 	"database/sql"
+	"fmt"
 
 	"github.com/ethereum/go-ethereum"
 	"github.com/hermeznetwork/hermez-node/common"
@@ -343,7 +344,7 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 		}
 
 		batchNum := common.BatchNum(evtForgeBatch.BatchNum)
-		forgeL1TxsNum := nextForgeL1TxsNum
+		nextForgeL1TxsNumCpy := nextForgeL1TxsNum
 		var l1UserTxs []common.L1Tx
 		// Check if this is a L1Batch to get L1 Tx from it
 		if forgeBatchArgs.L1Batch {
@@ -352,7 +353,7 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 			// that stateDB can process them.
 
 			// First try to find them in HistoryDB.
-			l1UserTxs, err := s.historyDB.GetL1UserTxs(forgeL1TxsNum)
+			l1UserTxs, err := s.historyDB.GetL1UserTxs(nextForgeL1TxsNumCpy)
 			if len(l1UserTxs) == 0 {
 				// If not found in the DB, try to find them in
 				// this block.  This could happen because in a
@@ -365,7 +366,7 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 				// closed empty, so we leave `l1UserTxs` as an
 				// empty slice.
 				for _, l1UserTx := range rollupData.l1UserTxs {
-					if *l1UserTx.ToForgeL1TxsNum == forgeL1TxsNum {
+					if *l1UserTx.ToForgeL1TxsNum == nextForgeL1TxsNumCpy {
 						l1UserTxs = append(l1UserTxs, l1UserTx)
 					}
 				}
@@ -373,26 +374,26 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 			if err != nil {
 				return nil, err
 			}
+			nextForgeL1TxsNum++
 
 			position = len(l1UserTxs)
-
-			// Get L1 Coordinator Txs
-			for i := range forgeBatchArgs.L1CoordinatorTxs {
-				l1CoordinatorTx := forgeBatchArgs.L1CoordinatorTxs[i]
-				l1CoordinatorTx.Position = position
-				l1CoordinatorTx.ToForgeL1TxsNum = &forgeL1TxsNum
-				l1CoordinatorTx.UserOrigin = false
-				l1CoordinatorTx.EthBlockNum = blockNum
-				l1CoordinatorTx.BatchNum = &batchNum
-				l1Tx, err := common.NewL1Tx(&l1CoordinatorTx)
-				if err != nil {
-					return nil, err
-				}
-
-				batchData.L1CoordinatorTxs = append(batchData.L1CoordinatorTxs, *l1Tx)
-				position++
+		}
+		// Get L1 Coordinator Txs
+		for i := range forgeBatchArgs.L1CoordinatorTxs {
+			l1CoordinatorTx := forgeBatchArgs.L1CoordinatorTxs[i]
+			l1CoordinatorTx.Position = position
+			// l1CoordinatorTx.ToForgeL1TxsNum = &forgeL1TxsNum
+			l1CoordinatorTx.UserOrigin = false
+			l1CoordinatorTx.EthBlockNum = blockNum
+			l1CoordinatorTx.BatchNum = &batchNum
+			l1Tx, err := common.NewL1Tx(&l1CoordinatorTx)
+			if err != nil {
+				return nil, err
 			}
-			nextForgeL1TxsNum++
+
+			batchData.L1CoordinatorTxs = append(batchData.L1CoordinatorTxs, *l1Tx)
+			position++
+			fmt.Println("DGB l1coordtx")
 		}
 
 		// Insert all the txs forged in this batch (l1UserTxs,
@@ -443,12 +444,14 @@ func (s *Synchronizer) rollupSync(ethBlock *common.Block) (*rollupData, error) {
 			ForgerAddr:  *sender,
 			// CollectedFees: , TODO: Clarify where to get them if they are still needed
 			StateRoot:   forgeBatchArgs.NewStRoot,
-			NumAccounts: numAccounts,
+			NumAccounts: numAccounts, // TODO: Calculate this value
+			LastIdx:     forgeBatchArgs.NewLastIdx,
 			ExitRoot:    forgeBatchArgs.NewExitRoot,
 			SlotNum:     slotNum,
 		}
 		if forgeBatchArgs.L1Batch {
-			batch.ForgeL1TxsNum = &forgeL1TxsNum
+			batch.ForgeL1TxsNum = &nextForgeL1TxsNumCpy
+			batchData.L1Batch = true
 		}
 		batchData.Batch = batch
 		rollupData.batches = append(rollupData.batches, *batchData)
diff --git a/synchronizer/synchronizer_test.go b/synchronizer/synchronizer_test.go
index da51a0a..7d962f8 100644
--- a/synchronizer/synchronizer_test.go
+++ b/synchronizer/synchronizer_test.go
@@ -2,8 +2,6 @@ package synchronizer
 
 import (
 	"context"
-	"crypto/ecdsa"
-	"encoding/binary"
 	"fmt"
 	"io/ioutil"
 	"math/big"
@@ -11,14 +9,13 @@ import (
 	"testing"
 
 	ethCommon "github.com/ethereum/go-ethereum/common"
-	ethCrypto "github.com/ethereum/go-ethereum/crypto"
 	"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/statedb"
 	"github.com/hermeznetwork/hermez-node/eth"
 	"github.com/hermeznetwork/hermez-node/test"
-	"github.com/iden3/go-iden3-crypto/babyjub"
+	"github.com/hermeznetwork/hermez-node/test/til"
 	"github.com/jinzhu/copier"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -34,13 +31,11 @@ func (t *timer) Time() int64 {
 	return currentTime
 }
 
-type tokenData struct {
-	TokenID common.TokenID
-	Addr    ethCommon.Address
-	Consts  eth.ERC20Consts
-}
-
 func TestSync(t *testing.T) {
+	//
+	// Setup
+	//
+
 	ctx := context.Background()
 	// Int State DB
 	dir, err := ioutil.TempDir("", "tmpdb")
@@ -62,131 +57,242 @@ func TestSync(t *testing.T) {
 	// Init eth client
 	var timer timer
 	clientSetup := test.NewClientSetupExample()
+	bootCoordAddr := clientSetup.AuctionVariables.BootCoordinator
 	client := test.NewClient(true, &timer, &ethCommon.Address{}, clientSetup)
 
 	// Create Synchronizer
 	s, err := NewSynchronizer(client, historyDB, stateDB)
 	require.Nil(t, err)
 
+	//
+	// First Sync from an initial state
+	//
+
 	// Test Sync for rollup genesis block
-	blockData, _, err := s.Sync2(ctx, nil)
+	syncBlock, discards, err := s.Sync2(ctx, nil)
 	require.Nil(t, err)
-	require.NotNil(t, blockData)
-	assert.Equal(t, int64(1), blockData.Block.EthBlockNum)
-	blocks, err := s.historyDB.GetBlocks(0, 9999)
+	require.Nil(t, discards)
+	require.NotNil(t, syncBlock)
+	assert.Equal(t, int64(1), syncBlock.Block.EthBlockNum)
+	dbBlocks, err := s.historyDB.GetAllBlocks()
 	require.Nil(t, err)
-	assert.Equal(t, 1, len(blocks))
-	assert.Equal(t, int64(1), blocks[0].EthBlockNum)
+	assert.Equal(t, 1, len(dbBlocks))
+	assert.Equal(t, int64(1), dbBlocks[0].EthBlockNum)
 
-	/*
-		// Test Sync for a block with new Tokens and L1UserTxs
-		// accounts := test.GenerateKeys(t, []string{"A", "B", "C", "D"})
-		l1UserTxs, _, _, _ := test.GenerateTestTxsFromSet(t, `
-		A (1): 10
-		A (2): 20
-		B (1): 5
-		C (1): 8
-		D (3): 15
-		> advance batch
-			`)
-		require.Greater(t, len(l1UserTxs[0]), 0)
-			// require.Greater(t, len(tokens), 0)
-
-			for i := 1; i <= 3; i++ {
-				_, err := client.RollupAddToken(ethCommon.BigToAddress(big.NewInt(int64(i*10000))),
-					clientSetup.RollupVariables.FeeAddToken)
-				require.Nil(t, err)
-			}
+	// Sync again and expect no new blocks
+	syncBlock, discards, err = s.Sync2(ctx, nil)
+	require.Nil(t, err)
+	require.Nil(t, discards)
+	require.Nil(t, syncBlock)
 
-			for i := range l1UserTxs[0] {
-				client.CtlAddL1TxUser(&l1UserTxs[0][i])
-			}
-			client.CtlMineBlock()
+	//
+	// Generate blockchain and smart contract data, and fill the test smart contracts
+	//
 
-			err = s.Sync(context.Background())
-			require.Nil(t, err)
+	// Generate blockchain data with til
+	set1 := `
+		Type: Blockchain
 
-			getTokens, err := s.historyDB.GetTokens()
-			require.Nil(t, err)
-			assert.Equal(t, 3, len(getTokens))
-	*/
+		AddToken(1)
+		AddToken(2)
+		AddToken(3)
 
-	// Generate tokens vector
-	numTokens := 3
-	tokens := make([]tokenData, numTokens)
-	for i := 1; i <= numTokens; i++ {
-		addr := ethCommon.BigToAddress(big.NewInt(int64(i * 10000)))
-		consts := eth.ERC20Consts{
-			Name:     fmt.Sprintf("Token %d", i),
-			Symbol:   fmt.Sprintf("TK%d", i),
-			Decimals: uint64(i * 2),
-		}
-		tokens[i-1] = tokenData{common.TokenID(i), addr, consts}
-	}
+		CreateAccountDeposit(1) A: 20 // Idx=256+1
+		CreateAccountDeposit(2) A: 20 // Idx=256+2
+		CreateAccountDeposit(1) B: 5  // Idx=256+3
+		CreateAccountDeposit(1) C: 5  // Idx=256+4
+		CreateAccountDeposit(1) D: 5  // Idx=256+5
 
-	numUsers := 4
-	keys := make([]*userKeys, numUsers)
-	for i := range keys {
-		keys[i] = genKeys(i)
-	}
+		CreateAccountDepositCoordinator(2) B // Idx=256+0
 
-	// Generate some L1UserTxs of type deposit
-	l1UserTxs := make([]*common.L1Tx, 5)
-	for i := range l1UserTxs {
-		l1UserTxs[i] = &common.L1Tx{
-			FromIdx:     common.Idx(0),
-			FromEthAddr: keys[i%numUsers].Addr,
-			FromBJJ:     keys[i%numUsers].BJJPK,
-			Amount:      big.NewInt(0),
-			LoadAmount:  big.NewInt((int64(i) + 1) * 1000),
-			TokenID:     common.TokenID(i%numTokens + 1),
+		> batchL1 // forge L1UserTxs{nil}, freeze defined L1UserTxs
+		> batchL1 // forge defined L1UserTxs, freeze L1UserTxs{nil}
+		> block
+
+	`
+	tc := til.NewContext(eth.RollupConstMaxL1UserTx)
+	blocks, err := tc.GenerateBlocks(set1)
+	require.Nil(t, err)
+	require.Equal(t, 1, len(blocks))
+	require.Equal(t, 3, len(blocks[0].AddedTokens))
+	require.Equal(t, 5, len(blocks[0].L1UserTxs))
+	require.Equal(t, 2, len(blocks[0].Batches))
+
+	tokenConsts := map[common.TokenID]eth.ERC20Consts{}
+	// Generate extra required data
+	for _, block := range blocks {
+		for _, token := range block.AddedTokens {
+			consts := eth.ERC20Consts{
+				Name:     fmt.Sprintf("Token %d", token.TokenID),
+				Symbol:   fmt.Sprintf("TK%d", token.TokenID),
+				Decimals: 18,
+			}
+			tokenConsts[token.TokenID] = consts
+			client.CtlAddERC20(token.EthAddr, consts)
 		}
 	}
 
-	// Add tokens to ethereum, and to rollup
-	for _, token := range tokens {
-		client.CtlAddERC20(token.Addr, token.Consts)
-		_, err := client.RollupAddTokenSimple(token.Addr, clientSetup.RollupVariables.FeeAddToken)
-		require.Nil(t, err)
+	// Add block data to the smart contracts
+	for _, block := range blocks {
+		for _, token := range block.AddedTokens {
+			_, err := client.RollupAddTokenSimple(token.EthAddr, clientSetup.RollupVariables.FeeAddToken)
+			require.Nil(t, err)
+		}
+		for _, tx := range block.L1UserTxs {
+			client.CtlSetAddr(tx.FromEthAddr)
+			_, err := client.RollupL1UserTxERC20ETH(tx.FromBJJ, int64(tx.FromIdx), tx.LoadAmount, tx.Amount,
+				uint32(tx.TokenID), int64(tx.ToIdx))
+			require.Nil(t, err)
+		}
+		client.CtlSetAddr(bootCoordAddr)
+		for _, batch := range block.Batches {
+			_, err := client.RollupForgeBatch(&eth.RollupForgeBatchArgs{
+				NewLastIdx:            batch.Batch.LastIdx,
+				NewStRoot:             batch.Batch.StateRoot,
+				NewExitRoot:           batch.Batch.ExitRoot,
+				L1CoordinatorTxs:      batch.L1CoordinatorTxs,
+				L1CoordinatorTxsAuths: [][]byte{}, // Intentionally empty
+				L2TxsData:             batch.L2Txs,
+				FeeIdxCoordinator:     []common.Idx{}, // TODO
+				// Circuit selector
+				VerifierIdx: 0, // Intentionally empty
+				L1Batch:     batch.L1Batch,
+				ProofA:      [2]*big.Int{},    // Intentionally empty
+				ProofB:      [2][2]*big.Int{}, // Intentionally empty
+				ProofC:      [2]*big.Int{},    // Intentionally empty
+			})
+			require.Nil(t, err)
+		}
+		// Mine block and sync
+		client.CtlMineBlock()
 	}
 
-	// Add L1Txs to rollup
-	for i := range l1UserTxs {
-		tx := l1UserTxs[i]
-		_, err := client.RollupL1UserTxERC20ETH(tx.FromBJJ, int64(tx.FromIdx), tx.LoadAmount, tx.Amount,
-			uint32(tx.TokenID), int64(tx.ToIdx))
-		require.Nil(t, err)
+	//
+	// Sync to synchronize the current state from the test smart contracts
+	//
+
+	syncBlock, discards, err = s.Sync2(ctx, nil)
+	require.Nil(t, err)
+	require.Nil(t, discards)
+	require.NotNil(t, syncBlock)
+	assert.Equal(t, int64(2), syncBlock.Block.EthBlockNum)
+
+	// Fill extra fields not generated by til in til block
+	openToForge := int64(0)
+	toForgeL1TxsNum := int64(0)
+	for i := range blocks {
+		block := &blocks[i]
+		for j := range block.Batches {
+			batch := &block.Batches[j]
+			if batch.L1Batch {
+				// Set BatchNum for forged L1UserTxs to til blocks
+				bn := batch.Batch.BatchNum
+				for k := range blocks {
+					block := &blocks[k]
+					for l := range block.L1UserTxs {
+						tx := &block.L1UserTxs[l]
+						if *tx.ToForgeL1TxsNum == openToForge {
+							tx.BatchNum = &bn
+						}
+					}
+				}
+				openToForge++
+			}
+
+			batch.Batch.EthBlockNum = block.Block.EthBlockNum
+			batch.Batch.ForgerAddr = bootCoordAddr // til doesn't fill the batch forger addr
+			if batch.L1Batch {
+				toForgeL1TxsNumCpy := toForgeL1TxsNum
+				batch.Batch.ForgeL1TxsNum = &toForgeL1TxsNumCpy // til doesn't fill the ForgeL1TxsNum
+				toForgeL1TxsNum++
+			}
+
+			batchNum := batch.Batch.BatchNum
+			for j := range batch.L1CoordinatorTxs {
+				tx := &batch.L1CoordinatorTxs[j]
+				tx.BatchNum = &batchNum
+				tx.EthBlockNum = batch.Batch.EthBlockNum
+				nTx, err := common.NewL1Tx(tx)
+				require.Nil(t, err)
+				*tx = *nTx
+			}
+		}
 	}
 
-	// Mine block and sync
-	client.CtlMineBlock()
+	block := blocks[0]
 
-	blockData, _, err = s.Sync2(ctx, nil)
+	//
+	// Check Sync output and HistoryDB state against expected values
+	// generated by til
+	//
+
+	// Check Blocks
+	dbBlocks, err = s.historyDB.GetAllBlocks()
 	require.Nil(t, err)
-	require.NotNil(t, blockData)
-	assert.Equal(t, int64(2), blockData.Block.EthBlockNum)
+	assert.Equal(t, 2, len(dbBlocks))
+	assert.Equal(t, int64(2), dbBlocks[1].EthBlockNum)
+	assert.NotEqual(t, dbBlocks[1].Hash, dbBlocks[0].Hash)
+	assert.Greater(t, dbBlocks[1].Timestamp.Unix(), dbBlocks[0].Timestamp.Unix())
 
-	// Check tokens in DB
+	// Check Tokens
+	assert.Equal(t, len(block.AddedTokens), len(syncBlock.AddedTokens))
 	dbTokens, err := s.historyDB.GetAllTokens()
 	require.Nil(t, err)
-	assert.Equal(t, len(tokens), len(dbTokens))
-	assert.Equal(t, len(tokens), len(blockData.AddedTokens))
-	for i := range tokens {
-		token := tokens[i]
-		addToken := blockData.AddedTokens[i]
+	assert.Equal(t, len(block.AddedTokens), len(dbTokens))
+	for i, token := range block.AddedTokens {
 		dbToken := dbTokens[i]
+		syncToken := syncBlock.AddedTokens[i]
+
+		assert.Equal(t, block.Block.EthBlockNum, syncToken.EthBlockNum)
+		assert.Equal(t, token.TokenID, syncToken.TokenID)
+		assert.Equal(t, token.EthAddr, syncToken.EthAddr)
+		tokenConst := tokenConsts[token.TokenID]
+		assert.Equal(t, tokenConst.Name, syncToken.Name)
+		assert.Equal(t, tokenConst.Symbol, syncToken.Symbol)
+		assert.Equal(t, tokenConst.Decimals, syncToken.Decimals)
+
+		var tokenCpy historydb.TokenRead
+		//nolint:gosec
+		require.Nil(t, copier.Copy(&tokenCpy, &token))      // copy common.Token to historydb.TokenRead
+		require.Nil(t, copier.Copy(&tokenCpy, &tokenConst)) // copy common.Token to historydb.TokenRead
+		tokenCpy.ItemID = dbToken.ItemID                    // we don't care about ItemID
+		assert.Equal(t, tokenCpy, dbToken)
+	}
+
+	// Check L1UserTxs
+	assert.Equal(t, len(block.L1UserTxs), len(syncBlock.L1UserTxs))
+	dbL1UserTxs, err := s.historyDB.GetAllL1UserTxs()
+	require.Nil(t, err)
+	assert.Equal(t, len(block.L1UserTxs), len(dbL1UserTxs))
+	// Ignore BatchNum in syncBlock.L1UserTxs because this value is set by the HistoryDB
+	for i := range syncBlock.L1UserTxs {
+		syncBlock.L1UserTxs[i].BatchNum = block.L1UserTxs[i].BatchNum
+	}
+	assert.Equal(t, block.L1UserTxs, syncBlock.L1UserTxs)
+	assert.Equal(t, block.L1UserTxs, dbL1UserTxs)
 
-		assert.Equal(t, int64(2), addToken.EthBlockNum)
-		assert.Equal(t, token.TokenID, addToken.TokenID)
-		assert.Equal(t, token.Addr, addToken.EthAddr)
-		assert.Equal(t, token.Consts.Name, addToken.Name)
-		assert.Equal(t, token.Consts.Symbol, addToken.Symbol)
-		assert.Equal(t, token.Consts.Decimals, addToken.Decimals)
-
-		var addTokenCpy historydb.TokenRead
-		require.Nil(t, copier.Copy(&addTokenCpy, &addToken)) // copy common.Token to historydb.TokenRead
-		addTokenCpy.ItemID = dbToken.ItemID                  // we don't care about ItemID
-		assert.Equal(t, addTokenCpy, dbToken)
+	// Check Batches
+	assert.Equal(t, len(block.Batches), len(syncBlock.Batches))
+	dbBatches, err := s.historyDB.GetAllBatches()
+	require.Nil(t, err)
+	assert.Equal(t, len(block.Batches), len(dbBatches))
+
+	for i, batch := range block.Batches {
+		batchNum := batch.Batch.BatchNum
+		dbBatch := dbBatches[i]
+		syncBatch := syncBlock.Batches[i]
+
+		// We don't care about TotalFeesUSD.  Use the syncBatch that
+		// has a TotalFeesUSD inserted by the HistoryDB
+		batch.Batch.TotalFeesUSD = syncBatch.Batch.TotalFeesUSD
+		batch.CreatedAccounts = syncBatch.CreatedAccounts // til doesn't output CreatedAccounts
+
+		// fmt.Printf("DBG Batch %d %+v\n", i, batch)
+		// fmt.Printf("DBG Batch Sync %d %+v\n", i, syncBatch)
+		// assert.Equal(t, batch.L1CoordinatorTxs, syncBatch.L1CoordinatorTxs)
+		fmt.Printf("DBG BatchNum: %d, LastIdx: %d\n", batchNum, batch.Batch.LastIdx)
+		assert.Equal(t, batch, syncBatch)
+		assert.Equal(t, batch.Batch, dbBatch)
 	}
 
 	// Check L1UserTxs in DB
@@ -213,28 +319,3 @@ func TestSync(t *testing.T) {
 		require.Nil(t, err)
 	*/
 }
-
-type userKeys struct {
-	BJJSK *babyjub.PrivateKey
-	BJJPK *babyjub.PublicKey
-	Addr  ethCommon.Address
-}
-
-func genKeys(i int) *userKeys {
-	i++ // i = 0 doesn't work for the ecdsa key generation
-	var sk babyjub.PrivateKey
-	binary.LittleEndian.PutUint64(sk[:], uint64(i))
-
-	// eth address
-	var key ecdsa.PrivateKey
-	key.D = big.NewInt(int64(i)) // only for testing
-	key.PublicKey.X, key.PublicKey.Y = ethCrypto.S256().ScalarBaseMult(key.D.Bytes())
-	key.Curve = ethCrypto.S256()
-	addr := ethCrypto.PubkeyToAddress(key.PublicKey)
-
-	return &userKeys{
-		BJJSK: &sk,
-		BJJPK: sk.Public(),
-		Addr:  addr,
-	}
-}
diff --git a/test/ethclient.go b/test/ethclient.go
index a9b630d..2956d69 100644
--- a/test/ethclient.go
+++ b/test/ethclient.go
@@ -674,7 +674,7 @@ func (c *Client) RollupL1UserTxERC20ETH(
 		TokenID:         common.TokenID(tokenID),
 		ToIdx:           common.Idx(toIdx),
 		ToForgeL1TxsNum: &toForgeL1TxsNum,
-		Position:        len(queue.L1TxQueue) - 1,
+		Position:        len(queue.L1TxQueue),
 		UserOrigin:      true,
 	})
 	if err != nil {
diff --git a/test/til/txs.go b/test/til/txs.go
index 7862fee..0ab20c4 100644
--- a/test/til/txs.go
+++ b/test/til/txs.go
@@ -15,6 +15,16 @@ import (
 	"github.com/iden3/go-iden3-crypto/babyjub"
 )
 
+func newBatchData(batchNum int) common.BatchData {
+	return common.BatchData{
+		L1CoordinatorTxs: []common.L1Tx{},
+		L2Txs:            []common.L2Tx{},
+		Batch: common.Batch{
+			BatchNum:  common.BatchNum(batchNum),
+			StateRoot: big.NewInt(0), ExitRoot: big.NewInt(0)},
+	}
+}
+
 // Context contains the data of the test
 type Context struct {
 	Instructions          []instruction
@@ -37,6 +47,7 @@ type Context struct {
 		l1CoordinatorTxs []L1Tx
 		l2Txs            []L2Tx
 	}
+	blockNum int64
 }
 
 // NewContext returns a new Context
@@ -51,14 +62,14 @@ func NewContext(rollupConstMaxL1UserTx int) *Context {
 		idx:                    common.UserThreshold,
 		// We use some placeholder values for StateRoot and ExitTree
 		// because these values will never be nil
-		currBatch: common.BatchData{Batch: common.Batch{
-			BatchNum:  common.BatchNum(currBatchNum),
-			StateRoot: big.NewInt(0), ExitRoot: big.NewInt(0)}},
+		currBatch:    newBatchData(currBatchNum),
 		currBatchNum: currBatchNum,
 		// start with 2 queues, one for toForge, and the other for openToForge
 		queues:      make([][]L1Tx, 2),
 		toForgeNum:  0,
 		openToForge: 1,
+		//nolint:gomnd
+		blockNum: 2, // rollup genesis blockNum
 	}
 }
 
@@ -135,6 +146,7 @@ func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) {
 				fromIdxName: inst.from,
 				L1Tx:        tx,
 			}
+
 			tc.currBatchTest.l1CoordinatorTxs = append(tc.currBatchTest.l1CoordinatorTxs, testTx)
 		case common.TxTypeCreateAccountDeposit, common.TxTypeCreateAccountDepositTransfer: // tx source: L1UserTx
 			if err := tc.checkIfTokenIsRegistered(inst); err != nil {
@@ -263,6 +275,7 @@ func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) {
 			if err = tc.calculateIdxForL1Txs(true, tc.currBatchTest.l1CoordinatorTxs); err != nil {
 				return nil, err
 			}
+			tc.currBatch.L1Batch = true
 			if err = tc.setIdxs(); err != nil {
 				log.Error(err)
 				return nil, err
@@ -275,12 +288,20 @@ func (tc *Context) GenerateBlocks(set string) ([]common.BlockData, error) {
 				tc.queues = append(tc.queues, newQueue)
 			}
 		case typeNewBlock:
+			tc.currBlock.Block = common.Block{
+				EthBlockNum: tc.blockNum,
+			}
 			blocks = append(blocks, tc.currBlock)
+			tc.blockNum++
 			tc.currBlock = common.BlockData{}
 		case typeAddToken:
 			newToken := common.Token{
+				EthAddr: ethCommon.BigToAddress(big.NewInt(int64(inst.tokenID * 100))), //nolint:gomnd
+				// Name:        fmt.Sprintf("Token %d", inst.tokenID),
+				// Symbol:      fmt.Sprintf("TK%d", inst.tokenID),
+				// Decimals:    18,
 				TokenID:     inst.tokenID,
-				EthBlockNum: int64(len(blocks)),
+				EthBlockNum: tc.blockNum,
 			}
 			if inst.tokenID != tc.lastRegisteredTokenID+1 {
 				return nil, fmt.Errorf("Line %d: AddToken TokenID should be sequential, expected TokenID: %d, defined TokenID: %d", inst.lineNum, tc.lastRegisteredTokenID+1, inst.tokenID)
@@ -353,10 +374,10 @@ func (tc *Context) setIdxs() error {
 		tc.currBatch.L2Txs = append(tc.currBatch.L2Txs, testTx.L2Tx)
 	}
 
+	tc.currBatch.Batch.LastIdx = int64(tc.idx - 1) // `-1` because tc.idx is the next available idx
 	tc.currBlock.Batches = append(tc.currBlock.Batches, tc.currBatch)
 	tc.currBatchNum++
-	tc.currBatch = common.BatchData{Batch: tc.currBatch.Batch}
-	tc.currBatch.Batch.BatchNum = common.BatchNum(tc.currBatchNum)
+	tc.currBatch = newBatchData(tc.currBatchNum)
 	tc.currBatchTest.l1CoordinatorTxs = nil
 	tc.currBatchTest.l2Txs = nil
 	return nil
@@ -375,6 +396,8 @@ func (tc *Context) addToL1Queue(tx L1Tx) error {
 	tx.L1Tx.UserOrigin = true
 	toForgeL1TxsNum := int64(tc.openToForge)
 	tx.L1Tx.ToForgeL1TxsNum = &toForgeL1TxsNum
+	tx.L1Tx.EthBlockNum = tc.blockNum
+	tx.L1Tx.Position = len(tc.queues[tc.openToForge])
 
 	// When an L1UserTx is generated, all idxs must be available (except when idx == 0 or idx == 1)
 	if tx.L1Tx.Type != common.TxTypeCreateAccountDeposit && tx.L1Tx.Type != common.TxTypeCreateAccountDepositTransfer {