@@ -42,7 +42,7 @@ server *gin.Engine,
 	hdb *historydb.HistoryDB,
 	sdb *statedb.StateDB,
 	l2db *l2db.L2DB,
-	config *configAPI,
+	config *Config,
 ) (*API, error) {
 	// Check input
 	// TODO: is stateDB only needed for explorer endpoints or for both?
@@ -54,8 +54,12 @@ return nil, errors.New("cannot serve Explorer endpoints without HistoryDB")
 	}
 
 	a := &API{
-		h:  hdb,
-		cg: config,
+		h: hdb,
+		cg: &configAPI{
+			RollupConstants:   *newRollupConstants(config.RollupConstants),
+			AuctionConstants:  config.AuctionConstants,
+			WDelayerConstants: config.WDelayerConstants,
+		},
 		s:  sdb,
 		l2: l2db,
 	}

@@ -219,7 +219,12 @@ l2DB := l2db.NewL2DB(database, 10, 100, 24*time.Hour)
 	test.WipeDB(l2DB.DB()) // this will clean HistoryDB and L2DB
 
 	// Config (smart contract constants)
-	config = getConfigTest()
+	_config := getConfigTest()
+	config = configAPI{
+		RollupConstants:   *newRollupConstants(_config.RollupConstants),
+		AuctionConstants:  _config.AuctionConstants,
+		WDelayerConstants: _config.WDelayerConstants,
+	}
 
 	// API
 	apiGin := gin.Default()
@@ -230,7 +235,7 @@ apiGin,
 		hdb,
 		sdb,
 		l2DB,
-		&config,
+		&_config,
 	)
 	if err != nil {
 		panic(err)
@@ -295,7 +300,8 @@ panic(err)
 	}
 	for _, block := range blocksData {
 		// Insert block into HistoryDB
-		if err := api.h.AddBlockSCData(&block); err != nil { //nolint:gosec block is used as read only in the function
+		// nolint reason: block is used as read only in the function
+		if err := api.h.AddBlockSCData(&block); err != nil { //nolint:gosec
 			panic(err)
 		}
 		// Extract data

@@ -26,6 +26,33 @@ MaxWithdrawalDelay      int                    `json:"maxWithdrawalDelay"`
 	ExchangeMultiplier      int                    `json:"exchangeMultiplier"`
 }
 
+func newRollupConstants(publicConstants common.RollupConstants) *rollupConstants {
+	return &rollupConstants{
+		PublicConstants:         publicConstants,
+		MaxFeeIdxCoordinator:    common.RollupConstMaxFeeIdxCoordinator,
+		ReservedIdx:             common.RollupConstReservedIDx,
+		ExitIdx:                 common.RollupConstExitIDx,
+		LimitLoadAmount:         common.RollupConstLimitLoadAmount,
+		LimitL2TransferAmount:   common.RollupConstLimitL2TransferAmount,
+		LimitTokens:             common.RollupConstLimitTokens,
+		L1CoordinatorTotalBytes: common.RollupConstL1CoordinatorTotalBytes,
+		L1UserTotalBytes:        common.RollupConstL1UserTotalBytes,
+		MaxL1UserTx:             common.RollupConstMaxL1UserTx,
+		MaxL1Tx:                 common.RollupConstMaxL1Tx,
+		InputSHAConstantBytes:   common.RollupConstInputSHAConstantBytes,
+		NumBuckets:              common.RollupConstNumBuckets,
+		MaxWithdrawalDelay:      common.RollupConstMaxWithdrawalDelay,
+		ExchangeMultiplier:      common.RollupConstExchangeMultiplier,
+	}
+}
+
+// Config of the API
+type Config struct {
+	RollupConstants   common.RollupConstants
+	AuctionConstants  common.AuctionConstants
+	WDelayerConstants common.WDelayerConstants
+}
+
 type configAPI struct {
 	RollupConstants   rollupConstants          `json:"hermez"`
 	AuctionConstants  common.AuctionConstants  `json:"auction"`

@@ -9,22 +9,9 @@ "github.com/hermeznetwork/hermez-node/common"
 	"github.com/stretchr/testify/assert"
 )
 
-func getConfigTest() configAPI {
-	var config configAPI
+func getConfigTest() Config {
+	var config Config
 
-	config.RollupConstants.ExchangeMultiplier = common.RollupConstExchangeMultiplier
-	config.RollupConstants.ExitIdx = common.RollupConstExitIDx
-	config.RollupConstants.ReservedIdx = common.RollupConstReservedIDx
-	config.RollupConstants.LimitLoadAmount, _ = new(big.Int).SetString("340282366920938463463374607431768211456", 10)
-	config.RollupConstants.LimitL2TransferAmount, _ = new(big.Int).SetString("6277101735386680763835789423207666416102355444464034512896", 10)
-	config.RollupConstants.LimitTokens = common.RollupConstLimitTokens
-	config.RollupConstants.L1CoordinatorTotalBytes = common.RollupConstL1CoordinatorTotalBytes
-	config.RollupConstants.L1UserTotalBytes = common.RollupConstL1UserTotalBytes
-	config.RollupConstants.MaxL1UserTx = common.RollupConstMaxL1UserTx
-	config.RollupConstants.MaxL1Tx = common.RollupConstMaxL1Tx
-	config.RollupConstants.InputSHAConstantBytes = common.RollupConstInputSHAConstantBytes
-	config.RollupConstants.NumBuckets = common.RollupConstNumBuckets
-	config.RollupConstants.MaxWithdrawalDelay = common.RollupConstMaxWithdrawalDelay
 	var rollupPublicConstants common.RollupConstants
 	rollupPublicConstants.AbsoluteMaxL1L2BatchTimeout = 240
 	rollupPublicConstants.HermezAuctionContract = ethCommon.HexToAddress("0x500D1d6A4c7D8Ae28240b47c8FCde034D827fD5e")
@@ -50,7 +37,7 @@ wdelayerConstants.HermezRollup = ethCommon.HexToAddress("0xEa960515F8b4C237730F028cBAcF0a28E7F45dE0")
 	wdelayerConstants.MaxEmergencyModeTime = uint64(1000000)
 	wdelayerConstants.MaxWithdrawalDelay = uint64(10000000)
 
-	config.RollupConstants.PublicConstants = rollupPublicConstants
+	config.RollupConstants = rollupPublicConstants
 	config.AuctionConstants = auctionConstants
 	config.WDelayerConstants = wdelayerConstants
 

@@ -51,17 +51,20 @@ }
 	return fromItem, order, limit, nil
 }
 
-func parseQueryUint(name string, dflt *uint, min, max uint, c querier) (*uint, error) { //nolint:SA4009 res may be not overwriten
+// nolint reason: res may be not overwriten
+func parseQueryUint(name string, dflt *uint, min, max uint, c querier) (*uint, error) { //nolint:SA4009
 	str := c.Query(name)
 	return stringToUint(str, name, dflt, min, max)
 }
 
-func parseQueryInt64(name string, dflt *int64, min, max int64, c querier) (*int64, error) { //nolint:SA4009 res may be not overwriten
+// nolint reason: res may be not overwriten
+func parseQueryInt64(name string, dflt *int64, min, max int64, c querier) (*int64, error) { //nolint:SA4009
 	str := c.Query(name)
 	return stringToInt64(str, name, dflt, min, max)
 }
 
-func parseQueryBool(name string, dflt *bool, c querier) (*bool, error) { //nolint:SA4009 res may be not overwriten
+// nolint reason: res may be not overwriten
+func parseQueryBool(name string, dflt *bool, c querier) (*bool, error) { //nolint:SA4009
 	str := c.Query(name)
 	if str == "" {
 		return dflt, nil
@@ -296,12 +299,14 @@ idxStr := c.Param(name)
 	return stringToIdx(idxStr, name)
 }
 
-func parseParamUint(name string, dflt *uint, min, max uint, c paramer) (*uint, error) { //nolint:SA4009 res may be not overwriten
+// nolint reason: res may be not overwriten
+func parseParamUint(name string, dflt *uint, min, max uint, c paramer) (*uint, error) { //nolint:SA4009
 	str := c.Param(name)
 	return stringToUint(str, name, dflt, min, max)
 }
 
-func parseParamInt64(name string, dflt *int64, min, max int64, c paramer) (*int64, error) { //nolint:SA4009 res may be not overwriten
+// nolint reason: res may be not overwriten
+func parseParamInt64(name string, dflt *int64, min, max int64, c paramer) (*int64, error) { //nolint:SA4009
 	str := c.Param(name)
 	return stringToInt64(str, name, dflt, min, max)
 }

@@ -1,3 +1,7 @@
+[API]
+Address = "localhost:8086"
+Explorer = true
+
 [Debug]
 APIAddress = "localhost:12345"
 
@@ -10,11 +14,6 @@ Host     = "localhost"
 User     = "hermez"
 Password = "yourpasswordhere"
 Name     = "hermez"
-
-[L2DB]
-SafetyPeriod = 10
-MaxTxs       = 512
-TTL          = "24h"
 
 [Web3]
 URL = "http://localhost:8545"
@@ -35,16 +34,9 @@ WDelayer = "0x5D94e3e7aeC542aB0F9129B9a7BAdeb5B3Ca0f77"
 TokenHEZ = "0x2b7dEe2CF60484325716A1c6A193519c8c3b19F3"
 TokenHEZName = "Hermez Network Token"
 
-[EthClient]
-CallGasLimit        = 300000
-DeployGasLimit      = 1000000
-GasPriceDiv         = 100
-ReceiptTimeout      = "60s"
-IntervalReceiptLoop = "200ms"
-
     [Synchronizer.InitialVariables.Auction]
     DonationAddress = "0x0000000000000000000000000000000000000001"
-    BootCoordinator = "0x0000000000000000000000000000000000000001"
+    BootCoordinator = "0xb4124cEB3451635DAcedd11767f004d8a28c6eE7"
     DefaultSlotSetBid = [
         "10000000000000000000",
         "10000000000000000000",

@@ -1,2 +1,14 @@
 ForgerAddress = "0x6BB84Cc84D4A34467aD12a2039A312f7029e2071"
 ForgerLoopInterval = "500ms"
+
+[EthClient]
+CallGasLimit        = 300000
+DeployGasLimit      = 1000000
+GasPriceDiv         = 100
+ReceiptTimeout      = "60s"
+IntervalReceiptLoop = "200ms"
+
+[L2DB]
+SafetyPeriod = 10
+MaxTxs       = 512
+TTL          = "24h"

@@ -44,3 +44,28 @@ }
 	batchNum := binary.BigEndian.Uint64(b[:batchNumBytesLen])
 	return BatchNum(batchNum), nil
 }
+
+// BatchData contains the information of a Batch
+type BatchData struct {
+	// L1UserTxs that were forged in the batch
+	L1Batch bool // TODO: Remove once Batch.ForgeL1TxsNum is a pointer
+	// L1UserTxs        []common.L1Tx
+	L1CoordinatorTxs []L1Tx
+	L2Txs            []L2Tx
+	CreatedAccounts  []Account
+	ExitTree         []ExitInfo
+	Batch            Batch
+}
+
+// NewBatchData creates an empty BatchData with the slices initialized.
+func NewBatchData() *BatchData {
+	return &BatchData{
+		L1Batch: false,
+		// L1UserTxs:        make([]common.L1Tx, 0),
+		L1CoordinatorTxs: make([]L1Tx, 0),
+		L2Txs:            make([]L2Tx, 0),
+		CreatedAccounts:  make([]Account, 0),
+		ExitTree:         make([]ExitInfo, 0),
+		Batch:            Batch{},
+	}
+}

@@ -13,3 +13,27 @@ BidValue    *big.Int          `meddler:"bid_value,bigint"`
 	EthBlockNum int64             `meddler:"eth_block_num"`
 	Bidder      ethCommon.Address `meddler:"bidder_addr"` // Coordinator reference
 }
+
+// BidCoordinator contains the coordinator info of a bid, along with the bid value
+type BidCoordinator struct {
+	SlotNum           int64             `meddler:"slot_num"`
+	DefaultSlotSetBid [6]*big.Int       `meddler:"default_slot_set_bid,json"`
+	BidValue          *big.Int          `meddler:"bid_value,bigint"`
+	Bidder            ethCommon.Address `meddler:"bidder_addr"` // address of the bidder
+	Forger            ethCommon.Address `meddler:"forger_addr"` // address of the forger
+	URL               string            `meddler:"url"`         // URL of the coordinators API
+}
+
+// Slot contains relevant information of a slot
+type Slot struct {
+	SlotNum        int64
+	DefaultSlotBid *big.Int
+	StartBlock     int64
+	EndBlock       int64
+	BatchesLen     int
+	BidValue       *big.Int
+	BootCoord      bool
+	Bidder         ethCommon.Address
+	Forger         ethCommon.Address
+	URL            string
+}

@@ -88,28 +88,3 @@ WDelayer WDelayerData
 	// TODO: enable when common.WithdrawalDelayerVars is Merged from Synchronizer PR
 	// WithdrawalDelayerVars *common.WithdrawalDelayerVars
 }
-
-// BatchData contains the information of a Batch
-type BatchData struct {
-	// L1UserTxs that were forged in the batch
-	L1Batch bool // TODO: Remove once Batch.ForgeL1TxsNum is a pointer
-	// L1UserTxs        []common.L1Tx
-	L1CoordinatorTxs []L1Tx
-	L2Txs            []L2Tx
-	CreatedAccounts  []Account
-	ExitTree         []ExitInfo
-	Batch            Batch
-}
-
-// NewBatchData creates an empty BatchData with the slices initialized.
-func NewBatchData() *BatchData {
-	return &BatchData{
-		L1Batch: false,
-		// L1UserTxs:        make([]common.L1Tx, 0),
-		L1CoordinatorTxs: make([]L1Tx, 0),
-		L2Txs:            make([]L2Tx, 0),
-		CreatedAccounts:  make([]Account, 0),
-		ExitTree:         make([]ExitInfo, 0),
-		Batch:            Batch{},
-	}
-}

@@ -23,6 +23,28 @@ // Only for test
 	GovernanceAddress ethCommon.Address `json:"governanceAddress"`
 }
 
+// SlotNum returns the slot number of a block number
+func (c *AuctionConstants) SlotNum(blockNum int64) int64 {
+	if blockNum >= c.GenesisBlockNum {
+		return (blockNum - c.GenesisBlockNum) / int64(c.BlocksPerSlot)
+	}
+	return -1
+}
+
+// SlotBlocks returns the first and the last block numbers included in that slot
+func (c *AuctionConstants) SlotBlocks(slotNum int64) (int64, int64) {
+	startBlock := c.GenesisBlockNum + slotNum*int64(c.BlocksPerSlot)
+	endBlock := startBlock + int64(c.BlocksPerSlot) - 1
+	return startBlock, endBlock
+}
+
+// RelativeBlock returns the relative block number within the slot where the
+// block number belongs
+func (c *AuctionConstants) RelativeBlock(blockNum int64) int64 {
+	slotNum := c.SlotNum(blockNum)
+	return blockNum - (c.GenesisBlockNum + (slotNum * int64(c.BlocksPerSlot)))
+}
+
 // AuctionVariables are the variables of the Auction Smart Contract
 type AuctionVariables struct {
 	EthBlockNum int64 `json:"ethereumBlockNum" meddler:"eth_block_num"`
@@ -32,6 +54,8 @@ // Boot Coordinator Address
 	BootCoordinator ethCommon.Address `json:"bootCoordinator" meddler:"boot_coordinator" validate:"required"`
 	// The minimum bid value in a series of 6 slots
 	DefaultSlotSetBid [6]*big.Int `json:"defaultSlotSetBid" meddler:"default_slot_set_bid,json" validate:"required"`
+	// SlotNum at which the new default_slot_set_bid applies
+	DefaultSlotSetBidSlotNum int64 `json:"-" meddler:"default_slot_set_bid_slot_num"`
 	// Distance (#slots) to the closest slot to which you can bid ( 2 Slots = 2 * 40 Blocks = 20 min )
 	ClosedAuctionSlots uint16 `json:"closedAuctionSlots" meddler:"closed_auction_slots" validate:"required"`
 	// Distance (#slots) to the farthest slot to which you can bid (30 days = 4320 slots )
@@ -48,7 +72,7 @@ // Copy returns a deep copy of the Variables
 func (v *AuctionVariables) Copy() *AuctionVariables {
 	vCpy := *v
 	for i := range v.DefaultSlotSetBid {
-		vCpy.DefaultSlotSetBid[i] = new(big.Int).SetBytes(v.DefaultSlotSetBid[i].Bytes())
+		vCpy.DefaultSlotSetBid[i] = CopyBigInt(v.DefaultSlotSetBid[i])
 	}
 	return &vCpy
 }

@@ -61,10 +61,6 @@ // RollupConstReservedIDx First 256 indexes reserved, first user index will be the 256
 	RollupConstReservedIDx = 255
 	// RollupConstExitIDx IDX 1 is reserved for exits
 	RollupConstExitIDx = 1
-	// RollupConstLimitLoadAmount Max load amount allowed (loadAmount: L1 --> L2)
-	RollupConstLimitLoadAmount = (1 << 128)
-	// RollupConstLimitL2TransferAmount Max amount allowed (amount L2 --> L2)
-	RollupConstLimitL2TransferAmount = (1 << 192)
 	// RollupConstLimitTokens Max number of tokens allowed to be registered inside the rollup
 	RollupConstLimitTokens = (1 << 32)
 	// RollupConstL1CoordinatorTotalBytes [4 bytes] token + [32 bytes] babyjub + [65 bytes] compressedSignature
@@ -91,6 +87,11 @@ LenVerifiers = 1
 )
 
 var (
+	// RollupConstLimitLoadAmount Max load amount allowed (loadAmount: L1 --> L2)
+	RollupConstLimitLoadAmount, _ = new(big.Int).SetString("340282366920938463463374607431768211456", 10)
+	// RollupConstLimitL2TransferAmount Max amount allowed (amount L2 --> L2)
+	RollupConstLimitL2TransferAmount, _ = new(big.Int).SetString("6277101735386680763835789423207666416102355444464034512896", 10)
+
 	// RollupConstEthAddressInternalOnly This ethereum address is used internally for rollup accounts that don't have ethereum address, only Babyjubjub
 	// This non-ethereum accounts can be created by the coordinator and allow users to have a rollup
 	// account without needing an ethereum address

@@ -36,3 +36,8 @@ var pkComp babyjub.PublicKeyComp
 	copy(pkComp[:], pkBytes[:])
 	return pkComp.Decompress()
 }
+
+// CopyBigInt returns a copy of the big int
+func CopyBigInt(a *big.Int) *big.Int {
+	return new(big.Int).SetBytes(a.Bytes())
+}

@@ -36,6 +36,7 @@ // Coordinator is the coordinator specific configuration.
 type Coordinator struct {
 	ForgerAddress     ethCommon.Address `validate:"required"`
 	ForgeLoopInterval Duration          `validate:"required"`
+	ConfirmBlocks     int64             `validate:"required"`
 	L2DB              struct {
 		SafetyPeriod common.BatchNum `validate:"required"`
 		MaxTxs       uint32          `validate:"required"`
@@ -48,6 +49,16 @@ BatchBuilder struct {
 		Path string `validate:"required"`
 	} `validate:"required"`
 	ServerProofs []ServerProof `validate:"required"`
+	EthClient    struct {
+		CallGasLimit        uint64   `validate:"required"`
+		DeployGasLimit      uint64   `validate:"required"`
+		GasPriceDiv         uint64   `validate:"required"`
+		ReceiptTimeout      Duration `validate:"required"`
+		IntervalReceiptLoop Duration `validate:"required"`
+	} `validate:"required"`
+	API struct {
+		Coordinator bool
+	} `validate:"required"`
 }
 
 // Node is the hermez node configuration.
@@ -78,12 +89,9 @@ WDelayer     ethCommon.Address `validate:"required"`
 		TokenHEZ     ethCommon.Address `validate:"required"`
 		TokenHEZName string            `validate:"required"`
 	} `validate:"required"`
-	EthClient struct {
-		CallGasLimit        uint64   `validate:"required"`
-		DeployGasLimit      uint64   `validate:"required"`
-		GasPriceDiv         uint64   `validate:"required"`
-		ReceiptTimeout      Duration `validate:"required"`
-		IntervalReceiptLoop Duration `validate:"required"`
+	API struct {
+		Address  string
+		Explorer bool
 	} `validate:"required"`
 	Debug struct {
 		APIAddress string

@@ -3,59 +3,34 @@
 import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/hermeznetwork/hermez-node/common"
+	"github.com/hermeznetwork/hermez-node/eth"
 )
 
 // Proof TBD this type will be received from the proof server
 type Proof struct {
 }
 
+// TxStatus is used to mark the status of an ethereum transaction
+type TxStatus string
+
+const (
+	// TxStatusPending marks the Tx as Pending
+	TxStatusPending TxStatus = "pending"
+	// TxStatusSent marks the Tx as Sent
+	TxStatusSent TxStatus = "sent"
+)
+
 // BatchInfo contans the Batch information
 type BatchInfo struct {
-	batchNum       common.BatchNum
-	serverProof    ServerProofInterface
-	zkInputs       *common.ZKInputs
-	proof          *Proof
+	BatchNum       common.BatchNum
+	ServerProof    ServerProofInterface
+	ZKInputs       *common.ZKInputs
+	Proof          *Proof
 	L1UserTxsExtra []common.L1Tx
 	L1OperatorTxs  []common.L1Tx
 	L2Txs          []common.PoolL2Tx
+	ForgeBatchArgs *eth.RollupForgeBatchArgs
 	// FeesInfo
-	ethTx *types.Transaction
-}
-
-// NewBatchInfo creates a new BatchInfo with the given batchNum &
-// ServerProof
-func NewBatchInfo(batchNum common.BatchNum, serverProof ServerProofInterface) BatchInfo {
-	return BatchInfo{
-		batchNum:    batchNum,
-		serverProof: serverProof,
-	}
-}
-
-// SetTxsInfo sets the l1UserTxs, l1OperatorTxs and l2Txs to the BatchInfo data
-// structure
-func (bi *BatchInfo) SetTxsInfo(l1UserTxsExtra, l1OperatorTxs []common.L1Tx, l2Txs []common.PoolL2Tx) {
-	// TBD parameter: feesInfo
-	bi.L1UserTxsExtra = l1UserTxsExtra
-	bi.L1OperatorTxs = l1OperatorTxs
-	bi.L2Txs = l2Txs
-}
-
-// SetZKInputs sets the ZKInputs to the BatchInfo data structure
-func (bi *BatchInfo) SetZKInputs(zkInputs *common.ZKInputs) {
-	bi.zkInputs = zkInputs
-}
-
-// SetServerProof sets the ServerProof to the BatchInfo data structure
-func (bi *BatchInfo) SetServerProof(serverProof ServerProofInterface) {
-	bi.serverProof = serverProof
-}
-
-// SetProof sets the Proof to the BatchInfo data structure
-func (bi *BatchInfo) SetProof(proof *Proof) {
-	bi.proof = proof
-}
-
-// SetEthTx sets the ethTx to the BatchInfo data structure
-func (bi *BatchInfo) SetEthTx(ethTx *types.Transaction) {
-	bi.ethTx = ethTx
+	TxStatus TxStatus
+	EthTx    *types.Transaction
 }

@@ -3,6 +3,7 @@
 import (
 	"context"
 	"fmt"
+	"sync"
 	"time"
 
 	ethCommon "github.com/ethereum/go-ethereum/common"
@@ -12,199 +13,384 @@ "github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/hermez-node/db/historydb"
 	"github.com/hermeznetwork/hermez-node/eth"
 	"github.com/hermeznetwork/hermez-node/log"
+	"github.com/hermeznetwork/hermez-node/synchronizer"
 	"github.com/hermeznetwork/hermez-node/txselector"
 )
 
 var errTODO = fmt.Errorf("TODO")
 
-// ErrStop is returned when the function is stopped asynchronously via the stop
-// channel.  It doesn't indicate an error.
-var ErrStop = fmt.Errorf("Stopped")
+// ErrDone is returned when the function is stopped asynchronously via a done
+// (terminated) context. It doesn't indicate an error.
+var ErrDone = fmt.Errorf("done")
 
 // Config contains the Coordinator configuration
 type Config struct {
 	ForgerAddress ethCommon.Address
+	ConfirmBlocks int64
 }
 
 // Coordinator implements the Coordinator type
 type Coordinator struct {
-	forging bool
-	// rw         *sync.RWMutex
-	// isForgeSeq bool // WIP just for testing while implementing
-
-	config Config
-
+	// State
+	forging         bool
 	batchNum        common.BatchNum
 	serverProofPool *ServerProofPool
+	consts          synchronizer.SCConsts
+	vars            synchronizer.SCVariables
 
-	// synchronizer *synchronizer.Synchronizer
+	cfg Config
+
 	hdb          *historydb.HistoryDB
 	txsel        *txselector.TxSelector
 	batchBuilder *batchbuilder.BatchBuilder
 
 	ethClient eth.ClientInterface
-	ethTxs    []*types.Transaction
-	// ethTxStore kvdb.Storage
+
+	msgCh  chan interface{}
+	ctx    context.Context
+	wg     sync.WaitGroup
+	cancel context.CancelFunc
+
+	pipelineCtx    context.Context
+	pipelineWg     sync.WaitGroup
+	pipelineCancel context.CancelFunc
+
+	txManager *TxManager
 }
 
 // NewCoordinator creates a new Coordinator
-func NewCoordinator(conf Config,
+func NewCoordinator(cfg Config,
 	hdb *historydb.HistoryDB,
 	txsel *txselector.TxSelector,
 	bb *batchbuilder.BatchBuilder,
 	serverProofs []ServerProofInterface,
-	ethClient eth.ClientInterface) *Coordinator { // once synchronizer is ready, synchronizer.Synchronizer will be passed as parameter here
+	ethClient eth.ClientInterface,
+	scConsts *synchronizer.SCConsts,
+	initSCVars *synchronizer.SCVariables,
+) *Coordinator { // once synchronizer is ready, synchronizer.Synchronizer will be passed as parameter here
 	serverProofPool := NewServerProofPool(len(serverProofs))
 	for _, serverProof := range serverProofs {
 		serverProofPool.Add(serverProof)
 	}
+
+	txManager := NewTxManager(ethClient, cfg.ConfirmBlocks)
+
+	ctx, cancel := context.WithCancel(context.Background())
 	c := Coordinator{
-		config:          conf,
+		forging:         false,
+		batchNum:        -1,
 		serverProofPool: serverProofPool,
-		hdb:             hdb,
-		txsel:           txsel,
-		batchBuilder:    bb,
-		ethClient:       ethClient,
+		consts:          *scConsts,
+		vars:            *initSCVars,
 
-		ethTxs: make([]*types.Transaction, 0),
-		// ethTxStore:      memory.NewMemoryStorage(),
-		// rw:              &sync.RWMutex{},
+		cfg: cfg,
+
+		hdb:          hdb,
+		txsel:        txsel,
+		batchBuilder: bb,
+
+		ethClient: ethClient,
+
+		msgCh: make(chan interface{}),
+		ctx:   ctx,
+		// wg
+		cancel: cancel,
+
+		txManager: txManager,
 	}
 	return &c
 }
 
-// TODO(Edu): Change the current design of the coordinator structur:
-// - Move Start and Stop functions (from node/node.go) here
-// - Add concept of StartPipeline, StopPipeline, that spawns and stops the goroutines
-// - Add a Manager that calls StartPipeline and StopPipeline, checks when it's time to forge, schedules new batches, etc.
-// - Add a TxMonitor that monitors successful ForgeBatch ethereum transactions and waits for N blocks of confirmation, and reports back errors to the Manager.
+// MsgSyncStats indicates an update to the Synchronizer stats
+type MsgSyncStats struct {
+	Stats synchronizer.Stats
+}
+
+// MsgSyncSCVars indicates an update to Smart Contract Vars
+type MsgSyncSCVars struct {
+	Rollup   *common.RollupVariables
+	Auction  *common.AuctionVariables
+	WDelayer *common.WDelayerVariables
+}
+
+// MsgSyncReorg indicates a reorg
+type MsgSyncReorg struct {
+}
+
+// SendMsg is a thread safe method to pass a message to the Coordinator
+func (c *Coordinator) SendMsg(msg interface{}) {
+	c.msgCh <- msg
+}
+
+func (c *Coordinator) handleMsgSyncSCVars(msg *MsgSyncSCVars) {
+	if msg.Rollup != nil {
+		c.vars.Rollup = *msg.Rollup
+	}
+	if msg.Auction != nil {
+		c.vars.Auction = *msg.Auction
+	}
+	if msg.WDelayer != nil {
+		c.vars.WDelayer = *msg.WDelayer
+	}
+}
+
+func (c *Coordinator) handleMsgSyncStats(stats *synchronizer.Stats) error {
+	if !stats.Synced() {
+		return nil
+	}
+	c.txManager.SetLastBlock(stats.Eth.LastBlock)
 
-// ForgeLoopFn is the function ran in a loop that checks if it's time to forge
-// and forges a batch if so and sends it to outBatchCh.  Returns true if it's
-// the coordinator turn to forge.
-func (c *Coordinator) ForgeLoopFn(outBatchCh chan *BatchInfo, stopCh chan bool) (forgetime bool, err error) {
-	// TODO: Move the logic to check if it's forge time or not outside the pipeline
-	isForgeSequence, err := c.isForgeSequence()
-	if err != nil {
-		return false, err
+	anyoneForge := false
+	if stats.Sync.Auction.CurrentSlot.BatchesLen == 0 &&
+		c.consts.Auction.RelativeBlock(stats.Eth.LastBlock) > int64(c.vars.Auction.SlotDeadline) {
+		log.Debug("Coordinator: anyone can forge in the current slot (slotDeadline passed)")
+		anyoneForge = true
 	}
-	if !isForgeSequence {
+	if stats.Sync.Auction.CurrentSlot.Forger != c.cfg.ForgerAddress && !anyoneForge {
 		if c.forging {
-			log.Info("ForgeLoopFn: forging state end")
+			log.Info("Coordinator: forging state end")
 			c.forging = false
+			c.PipelineStop()
 		}
-		log.Debug("ForgeLoopFn: not in forge time")
-		return false, nil
+		// log.Debug("Coordinator: not in forge time") // DBG
+		return nil
 	}
-	log.Debug("ForgeLoopFn: forge time")
+	// log.Debug("Coordinator: forge time") // DBG
 	if !c.forging {
 		// Start pipeline from a batchNum state taken from synchronizer
-		log.Info("ForgeLoopFn: forging state begin")
-		// c.batchNum = c.hdb.GetLastBatchNum() // uncomment when HistoryDB is ready
+		log.Info("Coordinator: forging state begin")
+		c.batchNum = common.BatchNum(stats.Sync.LastBatch)
 		err := c.txsel.Reset(c.batchNum)
 		if err != nil {
-			log.Errorw("ForgeLoopFn: TxSelector.Reset", "error", err)
-			return true, err
+			log.Errorw("Coordinator: TxSelector.Reset", "error", err)
+			return err
 		}
 		err = c.batchBuilder.Reset(c.batchNum, true)
 		if err != nil {
-			log.Errorw("ForgeLoopFn: BatchBuilder.Reset", "error", err)
-			return true, err
+			log.Errorw("Coordinator: BatchBuilder.Reset", "error", err)
+			return err
 		}
-		// c.batchQueue = NewBatchQueue()
 		c.forging = true
+		c.PipelineStart()
 	}
-	// TODO once synchronizer has this method ready:
-	// If there's been a reorg, handle it
-	// handleReorg() function decides if the reorg must restart the pipeline or not
-	// if c.synchronizer.Reorg():
-	_ = c.handleReorg()
+	return nil
+}
 
-	defer func() {
-		if err == ErrStop {
-			log.Info("ForgeLoopFn: forgeLoopFn stopped")
-		}
+// Start the coordinator
+func (c *Coordinator) Start() {
+	c.wg.Add(1)
+	go func() {
+		c.txManager.Run(c.ctx)
+		c.wg.Done()
 	}()
 
-	// 0. Wait for an available server proof
-	// blocking call
-	serverProof, err := c.serverProofPool.Get(stopCh)
-	if err != nil {
-		return true, err
-	}
-	defer func() {
-		if !forgetime || err != nil {
-			c.serverProofPool.Add(serverProof)
+	c.wg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-c.ctx.Done():
+				log.Info("Coordinator done")
+				c.wg.Done()
+				return
+			case msg := <-c.msgCh:
+				switch msg := msg.(type) {
+				case MsgSyncStats:
+					stats := msg.Stats
+					if err := c.handleMsgSyncStats(&stats); err != nil {
+						log.Errorw("Coordinator.handleMsgSyncStats error", "err", err)
+					}
+				case MsgSyncReorg:
+					if err := c.handleReorg(); err != nil {
+						log.Errorw("Coordinator.handleReorg error", "err", err)
+					}
+				case MsgSyncSCVars:
+					c.handleMsgSyncSCVars(&msg)
+				default:
+					log.Fatalw("Coordinator Unexpected Coordinator msg of type %T: %+v", msg, msg)
+				}
+			}
 		}
 	}()
+}
 
-	log.Debugw("ForgeLoopFn: using serverProof", "server", serverProof)
-	log.Debugw("ForgeLoopFn: forge start")
-	// forge for batchNum = batchNum + 1.
-	batchInfo, err := c.forge(serverProof)
-	if err != nil {
-		log.Errorw("forge", "error", err)
-		return true, err
+// Stop the coordinator
+func (c *Coordinator) Stop() {
+	log.Infow("Stopping coordinator...")
+	c.cancel()
+	c.wg.Wait()
+	if c.forging {
+		c.forging = false
+		c.PipelineStop()
 	}
-	log.Debugw("ForgeLoopFn: forge end", "batchNum", batchInfo.batchNum)
-	outBatchCh <- batchInfo
-	return true, nil
 }
 
-// GetProofCallForgeLoopFn is the function ran in a loop that gets a forged
-// batch via inBatchCh, waits for the proof server to finish, calls the ForgeBatch
-// function in the Rollup Smart Contract, and sends the batch to outBatchCh.
-func (c *Coordinator) GetProofCallForgeLoopFn(inBatchCh, outBatchCh chan *BatchInfo, stopCh chan bool) (err error) {
-	defer func() {
-		if err == ErrStop {
-			log.Info("GetProofCallForgeLoopFn: forgeLoopFn stopped")
+// PipelineStart starts the forging pipeline
+func (c *Coordinator) PipelineStart() {
+	c.pipelineCtx, c.pipelineCancel = context.WithCancel(context.Background())
+
+	queueSize := 1
+	batchChSentServerProof := make(chan *BatchInfo, queueSize)
+
+	c.pipelineWg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-c.pipelineCtx.Done():
+				log.Debug("Pipeline forgeSendServerProof loop done")
+				c.pipelineWg.Done()
+				return
+			default:
+				c.batchNum = c.batchNum + 1
+				batchInfo, err := c.forgeSendServerProof(c.pipelineCtx, c.batchNum)
+				if err == ErrDone {
+					continue
+				}
+				if err != nil {
+					log.Errorw("forgeSendServerProof", "err", err)
+					continue
+				}
+				batchChSentServerProof <- batchInfo
+			}
 		}
 	}()
-	select {
-	case <-stopCh:
-		return ErrStop
-	case batchInfo := <-inBatchCh:
-		log.Debugw("GetProofCallForgeLoopFn: getProofCallForge start", "batchNum", batchInfo.batchNum)
-		if err := c.getProofCallForge(batchInfo, stopCh); err != nil {
-			return err
+
+	c.pipelineWg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-c.pipelineCtx.Done():
+				log.Debug("Pipeline waitServerProofSendEth loop done")
+				c.pipelineWg.Done()
+				return
+			case batchInfo := <-batchChSentServerProof:
+				err := c.waitServerProof(c.pipelineCtx, batchInfo)
+				if err == ErrDone {
+					continue
+				}
+				if err != nil {
+					log.Errorw("waitServerProof", "err", err)
+					continue
+				}
+				c.txManager.AddBatch(batchInfo)
+			}
 		}
-		log.Debugw("GetProofCallForgeLoopFn: getProofCallForge end", "batchNum", batchInfo.batchNum)
-		outBatchCh <- batchInfo
+	}()
+}
+
+// PipelineStop stops the forging pipeline
+func (c *Coordinator) PipelineStop() {
+	log.Debug("Stopping pipeline...")
+	c.pipelineCancel()
+	c.pipelineWg.Wait()
+}
+
+// TxManager handles everything related to ethereum transactions:  It makes the
+// call to forge, waits for transaction confirmation, and keeps checking them
+// until a number of confirmed blocks have passed.
+type TxManager struct {
+	ethClient    eth.ClientInterface
+	batchCh      chan *BatchInfo
+	lastBlockCh  chan int64
+	queue        []*BatchInfo
+	confirmation int64
+	lastBlock    int64
+}
+
+// NewTxManager creates a new TxManager
+func NewTxManager(ethClient eth.ClientInterface, confirmation int64) *TxManager {
+	return &TxManager{
+		ethClient: ethClient,
+		// TODO: Find best queue size
+		batchCh: make(chan *BatchInfo, 16), //nolint:gomnd
+		// TODO: Find best queue size
+		lastBlockCh:  make(chan int64, 16), //nolint:gomnd
+		confirmation: confirmation,
+		lastBlock:    -1,
 	}
-	return nil
+}
+
+// AddBatch is a thread safe method to pass a new batch TxManager to be sent to
+// the smart contract via the forge call
+func (t *TxManager) AddBatch(batchInfo *BatchInfo) {
+	t.batchCh <- batchInfo
 }
 
-// ForgeCallConfirmLoopFn is the function ran in a loop that gets a batch that
-// has been sent to the Rollup Smart Contract via inBatchCh and waits for the
-// ethereum transaction confirmation.
-func (c *Coordinator) ForgeCallConfirmLoopFn(inBatchCh chan *BatchInfo, stopCh chan bool) (err error) {
-	defer func() {
-		if err == ErrStop {
-			log.Info("ForgeCallConfirmLoopFn: forgeConfirmLoopFn stopped")
+// SetLastBlock is a thread safe method to pass the lastBlock to the TxManager
+func (t *TxManager) SetLastBlock(lastBlock int64) {
+	t.lastBlockCh <- lastBlock
+}
+
+const waitTime = 200 * time.Millisecond
+const longWaitTime = 999 * time.Hour
+
+// Run the TxManager
+func (t *TxManager) Run(ctx context.Context) {
+	next := 0
+	d := time.Duration(longWaitTime)
+	for {
+		select {
+		case <-ctx.Done():
+			log.Info("TxManager done")
+			return
+		case lastBlock := <-t.lastBlockCh:
+			t.lastBlock = lastBlock
+		case batchInfo := <-t.batchCh:
+			ethTx, err := t.ethClient.RollupForgeBatch(batchInfo.ForgeBatchArgs)
+			if err != nil {
+				// TODO: Figure out different error cases and handle them properly
+				log.Errorw("TxManager ethClient.RollupForgeBatch", "err", err)
+				continue
+			}
+			log.Debugf("ethClient ForgeCall sent, batchNum: %d", batchInfo.BatchNum)
+			batchInfo.EthTx = ethTx
+			t.queue = append(t.queue, batchInfo)
+			d = waitTime
+		case <-time.After(d):
+			if len(t.queue) == 0 {
+				continue
+			}
+			batchInfo := t.queue[next]
+			txID := batchInfo.EthTx.Hash()
+			receipt, err := t.ethClient.EthTransactionReceipt(ctx, txID)
+			if err != nil {
+				log.Errorw("TxManager ethClient.EthTransactionReceipt", "err", err)
+				// TODO: Figure out different error cases and handle them properly
+				// TODO: Notify the Coordinator to maybe reset the pipeline
+				continue
+			}
+
+			if receipt != nil {
+				if receipt.Status == types.ReceiptStatusFailed {
+					log.Errorw("TxManager receipt status is failed", "receipt", receipt)
+				} else if receipt.Status == types.ReceiptStatusSuccessful {
+					if t.lastBlock-receipt.BlockNumber.Int64() >= t.confirmation {
+						log.Debugw("TxManager tx for RollupForgeBatch confirmed", "batchNum", batchInfo.BatchNum)
+						t.queue = t.queue[1:]
+						if len(t.queue) == 0 {
+							d = longWaitTime
+						}
+					}
+				}
+			}
+			if len(t.queue) == 0 {
+				next = 0
+			} else {
+				next = (next + 1) % len(t.queue)
+			}
 		}
-	}()
-	select {
-	case <-stopCh:
-		return ErrStop
-	case batchInfo := <-inBatchCh:
-		log.Debugw("ForgeCallConfirmLoopFn: forgeCallConfirm start", "batchNum", batchInfo.batchNum)
-		if err := c.forgeCallConfirm(batchInfo, stopCh); err != nil {
-			return err
-		}
-		log.Debugw("ForgeCallConfirmLoopFn: forgeCallConfirm  end", "batchNum", batchInfo.batchNum)
 	}
-	return nil
 }
 
-func (c *Coordinator) forge(serverProof ServerProofInterface) (*BatchInfo, error) {
+// forgeSendServerProof the next batch, wait for a proof server to be available and send the
+// circuit inputs to the proof server.
+func (c *Coordinator) forgeSendServerProof(ctx context.Context, batchNum common.BatchNum) (*BatchInfo, error) {
 	// remove transactions from the pool that have been there for too long
 	err := c.purgeRemoveByTimeout()
 	if err != nil {
 		return nil, err
 	}
 
-	c.batchNum = c.batchNum + 1
-	batchInfo := NewBatchInfo(c.batchNum, serverProof) // to accumulate metadata of the batch
+	batchInfo := BatchInfo{BatchNum: batchNum} // to accumulate metadata of the batch
 
 	var poolL2Txs []common.PoolL2Tx
 	// var feesInfo
@@ -213,14 +399,14 @@ // 1. Decide if we forge L2Tx or L1+L2Tx
 	if c.shouldL1L2Batch() {
 		// 2a: L1+L2 txs
 		// l1UserTxs, toForgeL1TxsNumber := c.hdb.GetNextL1UserTxs() // TODO once HistoryDB is ready, uncomment
-		var l1UserTxs []common.L1Tx = nil                                                                                 // tmp, depends on HistoryDB
-		l1UserTxsExtra, l1OperatorTxs, poolL2Txs, err = c.txsel.GetL1L2TxSelection([]common.Idx{}, c.batchNum, l1UserTxs) // TODO once feesInfo is added to method return, add the var
+		var l1UserTxs []common.L1Tx = nil                                                                               // tmp, depends on HistoryDB
+		l1UserTxsExtra, l1OperatorTxs, poolL2Txs, err = c.txsel.GetL1L2TxSelection([]common.Idx{}, batchNum, l1UserTxs) // TODO once feesInfo is added to method return, add the var
 		if err != nil {
 			return nil, err
 		}
 	} else {
 		// 2b: only L2 txs
-		_, poolL2Txs, err = c.txsel.GetL2TxSelection([]common.Idx{}, c.batchNum) // TODO once feesInfo is added to method return, add the var
+		_, poolL2Txs, err = c.txsel.GetL2TxSelection([]common.Idx{}, batchNum) // TODO once feesInfo is added to method return, add the var
 		if err != nil {
 			return nil, err
 		}
@@ -238,11 +424,14 @@ return nil, err
 	}
 
 	// 3.  Save metadata from TxSelector output for BatchNum
-	batchInfo.SetTxsInfo(l1UserTxsExtra, l1OperatorTxs, poolL2Txs) // TODO feesInfo
+	// batchInfo.SetTxsInfo(l1UserTxsExtra, l1OperatorTxs, poolL2Txs) // TODO feesInfo
+	batchInfo.L1UserTxsExtra = l1UserTxsExtra
+	batchInfo.L1OperatorTxs = l1OperatorTxs
+	batchInfo.L2Txs = poolL2Txs
 
 	// 4. Call BatchBuilder with TxSelector output
 	configBatch := &batchbuilder.ConfigBatch{
-		ForgerAddress: c.config.ForgerAddress,
+		ForgerAddress: c.cfg.ForgerAddress,
 	}
 	zkInputs, err := c.batchBuilder.BuildBatch([]common.Idx{}, configBatch, l1UserTxsExtra, l1OperatorTxs, poolL2Txs, nil) // TODO []common.TokenID --> feesInfo
 	if err != nil {
@@ -250,10 +439,25 @@ return nil, err
 	}
 
 	// 5. Save metadata from BatchBuilder output for BatchNum
-	batchInfo.SetZKInputs(zkInputs)
+	batchInfo.ZKInputs = zkInputs
+
+	// 6. Wait for an available server proof blocking call
+	serverProof, err := c.serverProofPool.Get(ctx)
+	if err != nil {
+		return nil, err
+	}
+	batchInfo.ServerProof = serverProof
+	defer func() {
+		// If there's an error further on, add the serverProof back to
+		// the pool
+		if err != nil {
+			c.serverProofPool.Add(serverProof)
+		}
+	}()
 
-	// 6. Call an idle server proof with BatchBuilder output, save server proof info for batchNum
-	err = batchInfo.serverProof.CalculateProof(zkInputs)
+	// 7. Call the selected idle server proof with BatchBuilder output,
+	// save server proof info for batchNum
+	err = batchInfo.ServerProof.CalculateProof(zkInputs)
 	if err != nil {
 		return nil, err
 	}
@@ -261,24 +465,17 @@
 	return &batchInfo, nil
 }
 
-// getProofCallForge gets the generated zkProof & sends it to the SmartContract
-func (c *Coordinator) getProofCallForge(batchInfo *BatchInfo, stopCh chan bool) error {
-	serverProof := batchInfo.serverProof
-	proof, err := serverProof.GetProof(stopCh) // blocking call, until not resolved don't continue. Returns when the proof server has calculated the proof
-	c.serverProofPool.Add(serverProof)
-	batchInfo.serverProof = nil
-	if err != nil {
-		return err
-	}
-	batchInfo.SetProof(proof)
-	forgeBatchArgs := c.prepareForgeBatchArgs(batchInfo)
-	ethTx, err := c.ethClient.RollupForgeBatch(forgeBatchArgs)
+// waitServerProof gets the generated zkProof & sends it to the SmartContract
+func (c *Coordinator) waitServerProof(ctx context.Context, batchInfo *BatchInfo) error {
+	proof, err := batchInfo.ServerProof.GetProof(ctx) // blocking call, until not resolved don't continue. Returns when the proof server has calculated the proof
 	if err != nil {
 		return err
 	}
-	// TODO: Move this to the next step (forgeCallConfirm)
-	log.Debugf("ethClient ForgeCall sent, batchNum: %d", c.batchNum)
-	batchInfo.SetEthTx(ethTx)
+	c.serverProofPool.Add(batchInfo.ServerProof)
+	batchInfo.ServerProof = nil
+	batchInfo.Proof = proof
+	batchInfo.ForgeBatchArgs = c.prepareForgeBatchArgs(batchInfo)
+	batchInfo.TxStatus = TxStatusPending
 
 	// TODO(FUTURE) once tx data type is defined, store ethTx (returned by ForgeCall)
 	// TBD if use ethTxStore as a disk k-v database, or use a Queue
@@ -294,65 +491,23 @@
 	return nil
 }
 
-func (c *Coordinator) forgeCallConfirm(batchInfo *BatchInfo, stopCh chan bool) error {
-	// TODO strategy of this sequence TBD
-	// confirm eth txs and mark them as accepted sequence
-	// IDEA: Keep an array in Coordinator with the list of sent ethTx.
-	// Here, loop over them and only delete them once the number of
-	// confirmed blocks is over a configured value.  If the tx is rejected,
-	// return error.
-	// ethTx := ethTxStore.GetFirstPending()
-	// waitForAccepted(ethTx) // blocking call, returns once the ethTx is mined
-	// ethTxStore.MarkAccepted(ethTx)
-	txID := batchInfo.ethTx.Hash()
-	// TODO: Follow EthereumClient.waitReceipt logic
-	count := 0
-	// TODO: Define this waitTime in the config
-	waitTime := 100 * time.Millisecond //nolint:gomnd
-	select {
-	case <-time.After(waitTime):
-		receipt, err := c.ethClient.EthTransactionReceipt(context.TODO(), txID)
-		if err != nil {
-			return err
-		}
-		if receipt != nil {
-			if receipt.Status == types.ReceiptStatusFailed {
-				return fmt.Errorf("receipt status is failed")
-			} else if receipt.Status == types.ReceiptStatusSuccessful {
-				return nil
-			}
-		}
-		// TODO: Call go-ethereum:
-		// if err == nil && receipt == nil :
-		// `func (ec *Client) TransactionByHash(ctx context.Context, hash common.Hash) (tx *types.Transaction, isPending bool, err error) {`
-		count++
-		if time.Duration(count)*waitTime > 60*time.Second {
-			log.Warnw("Waiting for ethTx receipt for more than 60 seconds", "tx", batchInfo.ethTx)
-			// TODO: Decide if we resend the Tx with higher gas price
-		}
-	case <-stopCh:
-		return ErrStop
-	}
-	return fmt.Errorf("timeout")
-}
-
 func (c *Coordinator) handleReorg() error {
 	return nil // TODO
 }
 
 // isForgeSequence returns true if the node is the Forger in the current ethereum block
-func (c *Coordinator) isForgeSequence() (bool, error) {
-	// TODO: Consider checking if we can forge by quering the Synchronizer instead of using ethClient
-	blockNum, err := c.ethClient.EthCurrentBlock()
-	if err != nil {
-		return false, err
-	}
-	addr, err := c.ethClient.EthAddress()
-	if err != nil {
-		return false, err
-	}
-	return c.ethClient.AuctionCanForge(*addr, blockNum+1)
-}
+// func (c *Coordinator) isForgeSequence() (bool, error) {
+// 	// TODO: Consider checking if we can forge by quering the Synchronizer instead of using ethClient
+// 	blockNum, err := c.ethClient.EthLastBlock()
+// 	if err != nil {
+// 		return false, err
+// 	}
+// 	addr, err := c.ethClient.EthAddress()
+// 	if err != nil {
+// 		return false, err
+// 	}
+// 	return c.ethClient.AuctionCanForge(*addr, blockNum+1)
+// }
 
 func (c *Coordinator) purgeRemoveByTimeout() error {
 	return nil // TODO

@@ -14,6 +14,7 @@ "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/log"
+	"github.com/hermeznetwork/hermez-node/synchronizer"
 	"github.com/hermeznetwork/hermez-node/test"
 	"github.com/hermeznetwork/hermez-node/txselector"
 	"github.com/stretchr/testify/assert"
@@ -28,15 +29,6 @@ require.Nil(t, err)
 	defer assert.Nil(t, os.RemoveAll(synchDBPath))
 	synchSdb, err := statedb.NewStateDB(synchDBPath, statedb.TypeSynchronizer, nLevels)
 	assert.Nil(t, err)
-
-	// txselDBPath, err := ioutil.TempDir("", "tmpTxSelDB")
-	// require.Nil(t, err)
-	// bbDBPath, err := ioutil.TempDir("", "tmpBBDB")
-	// require.Nil(t, err)
-	// txselSdb, err := statedb.NewLocalStateDB(txselDBPath, synchSdb, statedb.TypeTxSelector, nLevels)
-	// assert.Nil(t, err)
-	// bbSdb, err := statedb.NewLocalStateDB(bbDBPath, synchSdb, statedb.TypeBatchBuilder, nLevels)
-	// assert.Nil(t, err)
 
 	pass := os.Getenv("POSTGRES_PASS")
 	db, err := dbUtils.InitSQLDB(5432, "localhost", "hermez", pass, "hermez")
@@ -60,85 +52,6 @@
 	return txsel, bb
 }
 
-// CoordNode is an example of a Node that handles the goroutines for the coordinator
-type CoordNode struct {
-	c                     *Coordinator
-	stopForge             chan bool
-	stopGetProofCallForge chan bool
-	stopForgeCallConfirm  chan bool
-}
-
-func NewCoordNode(c *Coordinator) *CoordNode {
-	return &CoordNode{
-		c: c,
-	}
-}
-
-func (cn *CoordNode) Start() {
-	log.Debugw("Starting CoordNode...")
-	cn.stopForge = make(chan bool)
-	cn.stopGetProofCallForge = make(chan bool)
-	cn.stopForgeCallConfirm = make(chan bool)
-	queueSize := 8
-	batchCh0 := make(chan *BatchInfo, queueSize)
-	batchCh1 := make(chan *BatchInfo, queueSize)
-
-	go func() {
-		for {
-			select {
-			case <-cn.stopForge:
-				return
-			default:
-				if forge, err := cn.c.ForgeLoopFn(batchCh0, cn.stopForge); err == ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("CoordNode ForgeLoopFn", "error", err)
-					time.Sleep(200 * time.Millisecond) // Avoid overflowing log with errors
-				} else if !forge {
-					time.Sleep(200 * time.Millisecond)
-				}
-			}
-		}
-	}()
-	go func() {
-		for {
-			select {
-			case <-cn.stopGetProofCallForge:
-				return
-			default:
-				if err := cn.c.GetProofCallForgeLoopFn(
-					batchCh0, batchCh1, cn.stopGetProofCallForge); err == ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("CoordNode GetProofCallForgeLoopFn", "error", err)
-				}
-			}
-		}
-	}()
-	go func() {
-		for {
-			select {
-			case <-cn.stopForgeCallConfirm:
-				return
-			default:
-				if err := cn.c.ForgeCallConfirmLoopFn(
-					batchCh1, cn.stopForgeCallConfirm); err == ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("CoordNode ForgeCallConfirmLoopFn", "error", err)
-				}
-			}
-		}
-	}()
-}
-
-func (cn *CoordNode) Stop() {
-	log.Debugw("Stopping CoordNode...")
-	cn.stopForge <- true
-	cn.stopGetProofCallForge <- true
-	cn.stopForgeCallConfirm <- true
-}
-
 type timer struct {
 	time int64
 }
@@ -149,9 +62,12 @@ t.time++
 	return currentTime
 }
 
-func waitForSlot(t *testing.T, c *test.Client, slot int64) {
+var forger ethCommon.Address
+var bidder ethCommon.Address
+
+func waitForSlot(t *testing.T, coord *Coordinator, c *test.Client, slot int64) {
 	for {
-		blockNum, err := c.EthCurrentBlock()
+		blockNum, err := c.EthLastBlock()
 		require.Nil(t, err)
 		nextBlockSlot, err := c.AuctionGetSlotNumber(blockNum + 1)
 		require.Nil(t, err)
@@ -159,20 +75,35 @@ if nextBlockSlot == slot {
 			break
 		}
 		c.CtlMineBlock()
+		time.Sleep(100 * time.Millisecond)
+		var stats synchronizer.Stats
+		stats.Eth.LastBlock = c.CtlLastBlock()
+		stats.Sync.LastBlock = c.CtlLastBlock()
+		canForge, err := c.AuctionCanForge(forger, blockNum+1)
+		require.Nil(t, err)
+		if canForge {
+			// fmt.Println("DBG canForge")
+			stats.Sync.Auction.CurrentSlot.Forger = forger
+		}
+		coord.SendMsg(MsgSyncStats{
+			Stats: stats,
+		})
 	}
 }
 
 func TestCoordinator(t *testing.T) {
 	txsel, bb := newTestModules(t)
+	bidder = ethCommon.HexToAddress("0x6b175474e89094c44da98b954eedeac495271d0f")
+	forger = ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
 
-	conf := Config{}
+	conf := Config{
+		ForgerAddress: forger,
+	}
 	hdb := &historydb.HistoryDB{}
 	serverProofs := []ServerProofInterface{&ServerProofMock{}, &ServerProofMock{}}
 
 	var timer timer
 	ethClientSetup := test.NewClientSetupExample()
-	bidder := ethCommon.HexToAddress("0x6b175474e89094c44da98b954eedeac495271d0f")
-	forger := ethCommon.HexToAddress("0xc344E203a046Da13b0B4467EB7B3629D0C99F6E6")
 	ethClient := test.NewClient(true, &timer, &bidder, ethClientSetup)
 
 	// Bid for slot 2 and 4
@@ -183,28 +114,40 @@ require.Nil(t, err)
 	_, err = ethClient.AuctionBidSimple(4, big.NewInt(9999))
 	require.Nil(t, err)
 
-	c := NewCoordinator(conf, hdb, txsel, bb, serverProofs, ethClient)
-	cn := NewCoordNode(c)
-	cn.Start()
+	scConsts := &synchronizer.SCConsts{
+		Rollup:   *ethClientSetup.RollupConstants,
+		Auction:  *ethClientSetup.AuctionConstants,
+		WDelayer: *ethClientSetup.WDelayerConstants,
+	}
+	initSCVars := &synchronizer.SCVariables{
+		Rollup:   *ethClientSetup.RollupVariables,
+		Auction:  *ethClientSetup.AuctionVariables,
+		WDelayer: *ethClientSetup.WDelayerVariables,
+	}
+	c := NewCoordinator(conf, hdb, txsel, bb, serverProofs, ethClient, scConsts, initSCVars)
+	c.Start()
 	time.Sleep(1 * time.Second)
 
+	// NOTE: With the current test, the coordinator will enter in forge
+	// time before the bidded slot because no one else is forging in the
+	// other slots before the slot deadline.
 	// simulate forgeSequence time
-	waitForSlot(t, ethClient, 2)
-	log.Info("simulate entering in forge time")
+	waitForSlot(t, c, ethClient, 2)
+	log.Info("~~~ simulate entering in forge time")
 	time.Sleep(1 * time.Second)
 
 	// simulate going out from forgeSequence
-	waitForSlot(t, ethClient, 3)
-	log.Info("simulate going out from forge time")
+	waitForSlot(t, c, ethClient, 3)
+	log.Info("~~~ simulate going out from forge time")
 	time.Sleep(1 * time.Second)
 
 	// simulate entering forgeSequence time again
-	waitForSlot(t, ethClient, 4)
-	log.Info("simulate entering in forge time again")
+	waitForSlot(t, c, ethClient, 4)
+	log.Info("~~~ simulate entering in forge time again")
 	time.Sleep(2 * time.Second)
 
 	// simulate stopping forgerLoop by channel
-	log.Info("simulate stopping forgerLoop by closing coordinator stopch")
-	cn.Stop()
+	log.Info("~~~ simulate stopping forgerLoop by closing coordinator stopch")
+	c.Stop()
 	time.Sleep(1 * time.Second)
 }

@@ -1,6 +1,7 @@
 package coordinator
 
 import (
+	"context"
 	"time"
 
 	"github.com/hermeznetwork/hermez-node/common"
@@ -10,7 +11,7 @@
 // ServerProofInterface is the interface to a ServerProof that calculates zk proofs
 type ServerProofInterface interface {
 	CalculateProof(zkInputs *common.ZKInputs) error
-	GetProof(stopCh chan bool) (*Proof, error)
+	GetProof(ctx context.Context) (*Proof, error)
 }
 
 // ServerProof contains the data related to a ServerProof
@@ -33,7 +34,7 @@ return errTODO
 }
 
 // GetProof retreives the Proof from the ServerProof
-func (p *ServerProof) GetProof(stopCh chan bool) (*Proof, error) {
+func (p *ServerProof) GetProof(ctx context.Context) (*Proof, error) {
 	log.Error("TODO")
 	return nil, errTODO
 }
@@ -49,13 +50,13 @@ return nil
 }
 
 // GetProof retreives the Proof from the ServerProof
-func (p *ServerProofMock) GetProof(stopCh chan bool) (*Proof, error) {
+func (p *ServerProofMock) GetProof(ctx context.Context) (*Proof, error) {
 	// Simulate a delay
 	select {
 	case <-time.After(200 * time.Millisecond): //nolint:gomnd
 		return &Proof{}, nil
-	case <-stopCh:
-		return nil, ErrStop
+	case <-ctx.Done():
+		return nil, ErrDone
 	}
 }
 
@@ -77,18 +78,12 @@ p.pool <- serverProof
 }
 
 // Get returns the next available ServerProof
-func (p *ServerProofPool) Get(stopCh chan bool) (ServerProofInterface, error) {
+func (p *ServerProofPool) Get(ctx context.Context) (ServerProofInterface, error) {
 	select {
-	case <-stopCh:
-		log.Info("ServerProofPool.Get stopped")
-		return nil, ErrStop
-	default:
-		select {
-		case <-stopCh:
-			log.Info("ServerProofPool.Get stopped")
-			return nil, ErrStop
-		case serverProof := <-p.pool:
-			return serverProof, nil
-		}
+	case <-ctx.Done():
+		log.Info("ServerProofPool.Get done")
+		return nil, ErrDone
+	case serverProof := <-p.pool:
+		return serverProof, nil
 	}
 }

@@ -290,6 +290,13 @@ )
 	return db.SlicePtrsToSlice(batches).([]common.Batch), err
 }
 
+// GetBatchesLen retrieve number of batches from the DB, given a slotNum
+func (hdb *HistoryDB) GetBatchesLen(slotNum int64) (int, error) {
+	row := hdb.db.QueryRow("SELECT COUNT(*) FROM batch WHERE slot_num = $1;", slotNum)
+	var batchesLen int
+	return batchesLen, row.Scan(&batchesLen)
+}
+
 // GetLastBatchNum returns the BatchNum of the latest forged batch
 func (hdb *HistoryDB) GetLastBatchNum() (common.BatchNum, error) {
 	row := hdb.db.QueryRow("SELECT batch_num FROM batch ORDER BY batch_num DESC LIMIT 1;")
@@ -318,16 +325,6 @@ }
 	return err
 }
 
-// SyncPoD stores all the data that can be changed / added on a block in the PoD SC
-func (hdb *HistoryDB) SyncPoD(
-	blockNum uint64,
-	bids []common.Bid,
-	coordinators []common.Coordinator,
-	vars *common.AuctionVariables,
-) error {
-	return nil
-}
-
 // AddBids insert Bids into the DB
 func (hdb *HistoryDB) AddBids(bids []common.Bid) error { return hdb.addBids(hdb.db, bids) }
 func (hdb *HistoryDB) addBids(d meddler.DB, bids []common.Bid) error {
@@ -359,6 +356,27 @@ INNER JOIN coordinator ON bid.bidder_addr = coordinator.bidder_addr
 		WHERE slot_num = $1 ORDER BY item_id DESC LIMIT 1;`, slotNum,
 	)
 	return *bid, err
+}
+
+// GetBestBidCoordinator returns the forger address of the highest bidder in a slot by slotNum
+func (hdb *HistoryDB) GetBestBidCoordinator(slotNum int64) (*common.BidCoordinator, error) {
+	bidCoord := &common.BidCoordinator{}
+	err := meddler.QueryRow(
+		hdb.db, bidCoord,
+		`SELECT (
+			SELECT default_slot_set_bid_slot_num
+			FROM auction_vars
+			WHERE default_slot_set_bid_slot_num <= $1
+			ORDER BY eth_block_num DESC LIMIT 1
+			),
+		bid.slot_num, bid.bid_value, bid.bidder_addr,
+		coordinator.forger_addr, coordinator.url
+		FROM bid
+		INNER JOIN coordinator ON bid.bidder_addr = coordinator.bidder_addr
+		WHERE bid.slot_num = $1 ORDER BY bid.item_id DESC LIMIT 1;`,
+		slotNum)
+
+	return bidCoord, err
 }
 
 // GetBestBidsAPI returns the best bid in specific slot by slotNum
@@ -1244,6 +1262,7 @@ // that belongs to the creation of the smart contracts
 	rollup.EthBlockNum = 0
 	auction.EthBlockNum = 0
 	wDelayer.EthBlockNum = 0
+	auction.DefaultSlotSetBidSlotNum = 0
 	if err := hdb.setRollupVars(txn, rollup); err != nil {
 		return err
 	}

@@ -633,11 +633,7 @@ require.Nil(t, err)
 	assert.Equal(t, 0, len(l1UserTxs))
 }
 
-func TestSetInitialSCVars(t *testing.T) {
-	test.WipeDB(historyDB.DB())
-	_, _, _, err := historyDB.GetSCVars()
-	assert.Equal(t, sql.ErrNoRows, err)
-
+func exampleInitSCVars() (*common.RollupVariables, *common.AuctionVariables, *common.WDelayerVariables) {
 	//nolint:govet
 	rollup := &common.RollupVariables{
 		0,
@@ -655,6 +651,7 @@ [6]*big.Int{
 			big.NewInt(1), big.NewInt(2), big.NewInt(3),
 			big.NewInt(4), big.NewInt(5), big.NewInt(6),
 		},
+		0,
 		2,
 		4320,
 		[3]uint16{10, 11, 12},
@@ -671,6 +668,14 @@ 13,
 		14,
 		false,
 	}
+	return rollup, auction, wDelayer
+}
+
+func TestSetInitialSCVars(t *testing.T) {
+	test.WipeDB(historyDB.DB())
+	_, _, _, err := historyDB.GetSCVars()
+	assert.Equal(t, sql.ErrNoRows, err)
+	rollup, auction, wDelayer := exampleInitSCVars()
 	err = historyDB.SetInitialSCVars(rollup, auction, wDelayer)
 	require.Nil(t, err)
 	dbRollup, dbAuction, dbWDelayer, err := historyDB.GetSCVars()
@@ -791,6 +796,64 @@ for _, dbExit := range dbExits {
 		dbExitsByIdx[dbExit.AccountIdx] = dbExit
 	}
 	require.Equal(t, &block.Block.EthBlockNum, dbExitsByIdx[257].DelayedWithdrawn)
+}
+
+func TestGetBestBidCoordinator(t *testing.T) {
+	test.WipeDB(historyDB.DB())
+
+	rollup, auction, wDelayer := exampleInitSCVars()
+	err := historyDB.SetInitialSCVars(rollup, auction, wDelayer)
+	require.Nil(t, err)
+
+	tc := til.NewContext(common.RollupConstMaxL1UserTx)
+	blocks, err := tc.GenerateBlocks(`
+		Type: Blockchain
+		> block // blockNum=2
+	`)
+	require.Nil(t, err)
+	err = historyDB.AddBlockSCData(&blocks[0])
+	require.Nil(t, err)
+
+	coords := []common.Coordinator{
+		{
+			Bidder:      ethCommon.BigToAddress(big.NewInt(1)),
+			Forger:      ethCommon.BigToAddress(big.NewInt(2)),
+			EthBlockNum: 2,
+			URL:         "foo",
+		},
+		{
+			Bidder:      ethCommon.BigToAddress(big.NewInt(3)),
+			Forger:      ethCommon.BigToAddress(big.NewInt(4)),
+			EthBlockNum: 2,
+			URL:         "bar",
+		},
+	}
+	err = historyDB.addCoordinators(historyDB.db, coords)
+	require.Nil(t, err)
+	err = historyDB.addBids(historyDB.db, []common.Bid{
+		{
+			SlotNum:     10,
+			BidValue:    big.NewInt(10),
+			EthBlockNum: 2,
+			Bidder:      coords[0].Bidder,
+		},
+		{
+			SlotNum:     10,
+			BidValue:    big.NewInt(20),
+			EthBlockNum: 2,
+			Bidder:      coords[1].Bidder,
+		},
+	})
+	require.Nil(t, err)
+
+	forger10, err := historyDB.GetBestBidCoordinator(10)
+	require.Nil(t, err)
+	require.Equal(t, coords[1].Forger, forger10.Forger)
+	require.Equal(t, coords[1].Bidder, forger10.Bidder)
+	require.Equal(t, coords[1].URL, forger10.URL)
+
+	_, err = historyDB.GetBestBidCoordinator(11)
+	require.Equal(t, sql.ErrNoRows, err)
 }
 
 // setTestBlocks WARNING: this will delete the blocks and recreate them

@@ -536,6 +536,7 @@ eth_block_num BIGINT PRIMARY KEY REFERENCES block (eth_block_num) ON DELETE CASCADE,
     donation_address BYTEA NOT NULL,
     boot_coordinator BYTEA NOT NULL,
     default_slot_set_bid BYTEA NOT NULL,
+    default_slot_set_bid_slot_num BIGINT NOT NULL, -- slot_num after which the new default_slot_set_bid applies
     closed_auction_slots INT NOT NULL,
     open_auction_slots INT NOT NULL,
     allocation_ratio VARCHAR(200),

@@ -71,7 +71,7 @@ require.Nil(t, err)
 	slotDeadline, err := auctionClientTest.AuctionGetSlotDeadline()
 	require.Nil(t, err)
 	assert.Equal(t, newSlotDeadline, slotDeadline)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newSlotDeadline, auctionEvents.NewSlotDeadline[0].NewSlotDeadline)
 }
@@ -90,7 +90,7 @@ require.Nil(t, err)
 	openAuctionSlots, err := auctionClientTest.AuctionGetOpenAuctionSlots()
 	require.Nil(t, err)
 	assert.Equal(t, newOpenAuctionSlots, openAuctionSlots)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newOpenAuctionSlots, auctionEvents.NewOpenAuctionSlots[0].NewOpenAuctionSlots)
 }
@@ -109,7 +109,7 @@ require.Nil(t, err)
 	closedAuctionSlots, err := auctionClientTest.AuctionGetClosedAuctionSlots()
 	require.Nil(t, err)
 	assert.Equal(t, newClosedAuctionSlots, closedAuctionSlots)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newClosedAuctionSlots, auctionEvents.NewClosedAuctionSlots[0].NewClosedAuctionSlots)
 	_, err = auctionClientTest.AuctionSetClosedAuctionSlots(closedAuctionSlots)
@@ -130,7 +130,7 @@ require.Nil(t, err)
 	outbidding, err := auctionClientTest.AuctionGetOutbidding()
 	require.Nil(t, err)
 	assert.Equal(t, newOutbidding, outbidding)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newOutbidding, auctionEvents.NewOutbidding[0].NewOutbidding)
 	_, err = auctionClientTest.AuctionSetOutbidding(outbiddingConst)
@@ -151,7 +151,7 @@ require.Nil(t, err)
 	allocationRatio, err := auctionClientTest.AuctionGetAllocationRatio()
 	require.Nil(t, err)
 	assert.Equal(t, newAllocationRatio, allocationRatio)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newAllocationRatio, auctionEvents.NewAllocationRatio[0].NewAllocationRatio)
 	_, err = auctionClientTest.AuctionSetAllocationRatio(allocationRatioConst)
@@ -178,7 +178,7 @@ require.Nil(t, err)
 	donationAddress, err := auctionClientTest.AuctionGetDonationAddress()
 	require.Nil(t, err)
 	assert.Equal(t, &newDonationAddress, donationAddress)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newDonationAddress, auctionEvents.NewDonationAddress[0].NewDonationAddress)
 	_, err = auctionClientTest.AuctionSetDonationAddress(donationAddressConst)
@@ -193,7 +193,7 @@ require.Nil(t, err)
 	bootCoordinator, err := auctionClientTest.AuctionGetBootCoordinator()
 	require.Nil(t, err)
 	assert.Equal(t, &newBootCoordinator, bootCoordinator)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, newBootCoordinator, auctionEvents.NewBootCoordinator[0].NewBootCoordinator)
 	_, err = auctionClientTest.AuctionSetBootCoordinator(bootCoordinatorAddressConst)
@@ -227,7 +227,7 @@ require.Nil(t, err)
 	minBid, err := auctionClientTest.AuctionGetDefaultSlotSetBid(set)
 	require.Nil(t, err)
 	assert.Equal(t, minBid, newInitialMinBid)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, slotSet, auctionEvents.NewDefaultSlotSetBid[0].SlotSet)
 	assert.Equal(t, newInitialMinBid, auctionEvents.NewDefaultSlotSetBid[0].NewInitialMinBid)
@@ -251,7 +251,7 @@ bidderAddress := governanceAddressConst
 
 	_, err := auctionClientTest.AuctionSetCoordinator(forgerAddress, URL)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, forgerAddress, auctionEvents.SetCoordinator[0].ForgerAddress)
 	assert.Equal(t, bidderAddress, auctionEvents.SetCoordinator[0].BidderAddress)
@@ -268,7 +268,7 @@ amount.SetString("12000000000000000000", 10)
 	bidderAddress := governanceAddressConst
 	_, err = auctionClientTest.AuctionBid(amount, currentSlot+4, bidAmount, deadline)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, bidAmount, auctionEvents.NewBid[0].BidAmount)
 	assert.Equal(t, bidderAddress, auctionEvents.NewBid[0].Bidder)
@@ -306,7 +306,7 @@ budget.SetString("45200000000000000000", 10)
 	bidderAddress := governanceAddressConst
 	_, err = auctionClientTest.AuctionMultiBid(budget, currentSlot+4, currentSlot+10, slotSet, maxBid, minBid, deadline)
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, bidderAddress, auctionEvents.NewBid[0].Bidder)
 	assert.Equal(t, currentSlot+4, auctionEvents.NewBid[0].Slot)
@@ -334,7 +334,7 @@ amount.SetString("11000000000000000000", 10)
 
 	_, err := auctionClientTest.AuctionClaimHEZ()
 	require.Nil(t, err)
-	currentBlockNum, _ := auctionClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTest.client.EthLastBlock()
 	auctionEvents, _, _ := auctionClientTest.AuctionEventsByBlock(currentBlockNum)
 	assert.Equal(t, amount, auctionEvents.HEZClaimed[0].Amount)
 	assert.Equal(t, governanceAddressConst, auctionEvents.HEZClaimed[0].Owner)
@@ -345,10 +345,10 @@ auctionClientTestHermez, err := NewAuctionClient(ethereumClientHermez, auctionTestAddressConst, tokenHEZ)
 	require.Nil(t, err)
 	slotConst := 4
 	blockNum := int64(int(blocksPerSlot)*slotConst + int(genesisBlock))
-	currentBlockNum, _ := auctionClientTestHermez.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClientTestHermez.client.EthLastBlock()
 	blocksToAdd := blockNum - currentBlockNum
 	addBlocks(blocksToAdd, ethClientDialURL)
-	currentBlockNum, _ = auctionClientTestHermez.client.EthCurrentBlock()
+	currentBlockNum, _ = auctionClientTestHermez.client.EthLastBlock()
 	assert.Equal(t, currentBlockNum, blockNum)
 	_, err = auctionClientTestHermez.AuctionForge(governanceAddressConst)
 	require.Nil(t, err)

@@ -26,7 +26,7 @@ }
 
 // EthereumInterface is the interface to Ethereum
 type EthereumInterface interface {
-	EthCurrentBlock() (int64, error)
+	EthLastBlock() (int64, error)
 	// EthHeaderByNumber(context.Context, *big.Int) (*types.Header, error)
 	EthBlockByNumber(context.Context, int64) (*common.Block, error)
 	EthAddress() (*ethCommon.Address, error)
@@ -241,8 +241,8 @@
 	return receipt, err
 }
 
-// EthCurrentBlock returns the current block number in the blockchain
-func (c *EthereumClient) EthCurrentBlock() (int64, error) {
+// EthLastBlock returns the last block number in the blockchain
+func (c *EthereumClient) EthLastBlock() (int64, error) {
 	ctx, cancel := context.WithTimeout(context.TODO(), 1*time.Second)
 	defer cancel()
 	header, err := c.client.HeaderByNumber(ctx, nil)

@@ -77,7 +77,7 @@ registerTokensCount, err := rollupClient.RollupRegisterTokensCount()
 	require.Nil(t, err)
 	_, err = rollupClient.RollupAddToken(tokenHEZAddressConst, feeAddToken, deadline)
 	require.Nil(t, err)
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, tokenHEZAddressConst, rollupEvents.AddToken[0].TokenAddress)
@@ -106,7 +106,7 @@ require.Nil(t, err)
 
 	// Add Blocks
 	blockNum := int64(int(blocksPerSlot)*int(currentSlot+4) + int(genesisBlock))
-	currentBlockNum, _ := auctionClient.client.EthCurrentBlock()
+	currentBlockNum, _ := auctionClient.client.EthLastBlock()
 	blocksToAdd := blockNum - currentBlockNum
 	addBlocks(blocksToAdd, ethClientDialURL)
 
@@ -155,7 +155,7 @@ argsForge = args
 	_, err = rollupClient.RollupForgeBatch(argsForge)
 	require.Nil(t, err)
 
-	currentBlockNum, _ = rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ = rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, int64(1), rollupEvents.ForgeBatch[0].BatchNum)
@@ -181,7 +181,7 @@ newForgeL1L2BatchTimeout := int64(222)
 	_, err := rollupClient.RollupUpdateForgeL1L2BatchTimeout(newForgeL1L2BatchTimeout)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, newForgeL1L2BatchTimeout, rollupEvents.UpdateForgeL1L2BatchTimeout[0].NewForgeL1L2BatchTimeout)
@@ -192,7 +192,7 @@ newFeeAddToken := big.NewInt(12)
 	_, err := rollupClient.RollupUpdateFeeAddToken(newFeeAddToken)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, newFeeAddToken, rollupEvents.UpdateFeeAddToken[0].NewFeeAddToken)
@@ -217,7 +217,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -245,7 +245,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -273,7 +273,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -302,7 +302,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -330,7 +330,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -358,7 +358,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -387,7 +387,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -415,7 +415,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -443,7 +443,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -472,7 +472,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -500,7 +500,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -528,7 +528,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -557,7 +557,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -585,7 +585,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -613,7 +613,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -642,7 +642,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDUint32, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -670,7 +670,7 @@
 	_, err = rollupClientAux2.RollupL1UserTxERC20ETH(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenHEZID, toIdxInt64)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -700,7 +700,7 @@
 	_, err = rollupClientAux.RollupL1UserTxERC20Permit(l1Tx.FromBJJ, fromIdxInt64, l1Tx.LoadAmount, l1Tx.Amount, tokenIDERC777, toIdxInt64, deadline)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 	assert.Equal(t, l1Tx.FromBJJ, rollupEvents.L1UserTx[0].L1UserTx.FromBJJ)
 	assert.Equal(t, l1Tx.ToIdx, rollupEvents.L1UserTx[0].L1UserTx.ToIdx)
@@ -748,7 +748,7 @@ argsForge = args
 	_, err = rollupClient.RollupForgeBatch(argsForge)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, int64(2), rollupEvents.ForgeBatch[0].BatchNum)
@@ -787,7 +787,7 @@
 	_, err = rollupClientAux.RollupWithdrawMerkleProof(pk, tokenID, numExitRoot, fromIdx, amount, siblings, instantWithdraw)
 	require.Nil(t, err)
 
-	currentBlockNum, _ := rollupClient.client.EthCurrentBlock()
+	currentBlockNum, _ := rollupClient.client.EthLastBlock()
 	rollupEvents, _, _ := rollupClient.RollupEventsByBlock(currentBlockNum)
 
 	assert.Equal(t, uint64(fromIdx), rollupEvents.Withdraw[0].Idx)

@@ -41,7 +41,7 @@ require.Nil(t, err)
 	auxAddress, err := wdelayerClientTest.WDelayerGetHermezGovernanceDAOAddress()
 	require.Nil(t, err)
 	assert.Equal(t, &auxAddressConst, auxAddress)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.NewHermezGovernanceDAOAddress[0].NewHermezGovernanceDAOAddress)
 	wdelayerClientAux, err := NewWDelayerClient(ethereumClientAux, wdelayerTestAddressConst)
@@ -64,7 +64,7 @@ require.Nil(t, err)
 	auxAddress, err := wdelayerClientTest.WDelayerGetHermezKeeperAddress()
 	require.Nil(t, err)
 	assert.Equal(t, &auxAddressConst, auxAddress)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.NewHermezKeeperAddress[0].NewHermezKeeperAddress)
 	wdelayerClientAux, err := NewWDelayerClient(ethereumClientAux, wdelayerTestAddressConst)
@@ -87,7 +87,7 @@ require.Nil(t, err)
 	auxAddress, err := wdelayerClientTest.WDelayerGetWhiteHackGroupAddress()
 	require.Nil(t, err)
 	assert.Equal(t, &auxAddressConst, auxAddress)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.NewWhiteHackGroupAddress[0].NewWhiteHackGroupAddress)
 	wdelayerClientAux, err := NewWDelayerClient(ethereumClientAux, wdelayerTestAddressConst)
@@ -116,7 +116,7 @@ require.Nil(t, err)
 	withdrawalDelay, err := wdelayerClientTest.WDelayerGetWithdrawalDelay()
 	require.Nil(t, err)
 	assert.Equal(t, newWithdrawalDelay, withdrawalDelay)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, newWithdrawalDelay.Uint64(), wdelayerEvents.NewWithdrawalDelay[0].WithdrawalDelay)
 }
@@ -128,7 +128,7 @@ wdelayerClientHermez, err := NewWDelayerClient(ethereumClientHermez, wdelayerTestAddressConst)
 	require.Nil(t, err)
 	_, err = wdelayerClientHermez.WDelayerDeposit(auxAddressConst, tokenHEZAddressConst, amount)
 	require.Nil(t, err)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, amount, wdelayerEvents.Deposit[0].Amount)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.Deposit[0].Owner)
@@ -152,7 +152,7 @@ addTime(float64(newWithdrawalDelay.Int64()), ethClientDialURL)
 	addBlock(ethClientDialURL)
 	_, err = wdelayerClientTest.WDelayerWithdrawal(auxAddressConst, tokenHEZAddressConst)
 	require.Nil(t, err)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, amount, wdelayerEvents.Withdraw[0].Amount)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.Withdraw[0].Owner)
@@ -166,7 +166,7 @@ wdelayerClientHermez, err := NewWDelayerClient(ethereumClientHermez, wdelayerTestAddressConst)
 	require.Nil(t, err)
 	_, err = wdelayerClientHermez.WDelayerDeposit(auxAddressConst, tokenHEZAddressConst, amount)
 	require.Nil(t, err)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, amount, wdelayerEvents.Deposit[0].Amount)
 	assert.Equal(t, auxAddressConst, wdelayerEvents.Deposit[0].Owner)
@@ -181,7 +181,7 @@ require.Nil(t, err)
 	emergencyMode, err := wdelayerClientTest.WDelayerIsEmergencyMode()
 	require.Nil(t, err)
 	assert.Equal(t, true, emergencyMode)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	auxEvent := new(WDelayerEventEmergencyModeEnabled)
 	assert.Equal(t, auxEvent, &wdelayerEvents.EmergencyModeEnabled[0])
@@ -208,7 +208,7 @@ seconds := maxEmergencyModeTime.Seconds()
 	addTime(seconds, ethClientDialURL)
 	_, err = wdelayerClientWhite.WDelayerEscapeHatchWithdrawal(governanceAddressConst, tokenHEZAddressConst, amount)
 	require.Nil(t, err)
-	currentBlockNum, _ := wdelayerClientTest.client.EthCurrentBlock()
+	currentBlockNum, _ := wdelayerClientTest.client.EthLastBlock()
 	wdelayerEvents, _, _ := wdelayerClientTest.WDelayerEventsByBlock(currentBlockNum)
 	assert.Equal(t, tokenHEZAddressConst, wdelayerEvents.EscapeHatchWithdrawal[0].Token)
 	assert.Equal(t, governanceAddressConst, wdelayerEvents.EscapeHatchWithdrawal[0].To)

@@ -2,10 +2,14 @@ package node
 
 import (
 	"context"
+	"net/http"
 	"sync"
 	"time"
 
 	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/gin-contrib/cors"
+	"github.com/gin-gonic/gin"
+	"github.com/hermeznetwork/hermez-node/api"
 	"github.com/hermeznetwork/hermez-node/batchbuilder"
 	"github.com/hermeznetwork/hermez-node/common"
 	"github.com/hermeznetwork/hermez-node/config"
@@ -39,16 +43,11 @@ )
 
 // Node is the Hermez Node
 type Node struct {
+	nodeAPI  *NodeAPI
 	debugAPI *debugapi.DebugAPI
 	// Coordinator
-	coord                    *coordinator.Coordinator
-	coordCfg                 *config.Coordinator
-	stopForge                chan bool
-	stopGetProofCallForge    chan bool
-	stopForgeCallConfirm     chan bool
-	stoppedForge             chan bool
-	stoppedGetProofCallForge chan bool
-	stoppedForgeCallConfirm  chan bool
+	coord    *coordinator.Coordinator
+	coordCfg *config.Coordinator
 
 	// Synchronizer
 	sync *synchronizer.Synchronizer
@@ -87,14 +86,18 @@ ethClient, err := ethclient.Dial(cfg.Web3.URL)
 	if err != nil {
 		return nil, err
 	}
+	var ethCfg eth.EthereumConfig
+	if mode == ModeCoordinator {
+		ethCfg = eth.EthereumConfig{
+			CallGasLimit:        coordCfg.EthClient.CallGasLimit,
+			DeployGasLimit:      coordCfg.EthClient.DeployGasLimit,
+			GasPriceDiv:         coordCfg.EthClient.GasPriceDiv,
+			ReceiptTimeout:      coordCfg.EthClient.ReceiptTimeout.Duration,
+			IntervalReceiptLoop: coordCfg.EthClient.IntervalReceiptLoop.Duration,
+		}
+	}
 	client, err := eth.NewClient(ethClient, nil, nil, &eth.ClientConfig{
-		Ethereum: eth.EthereumConfig{
-			CallGasLimit:        cfg.EthClient.CallGasLimit,
-			DeployGasLimit:      cfg.EthClient.DeployGasLimit,
-			GasPriceDiv:         cfg.EthClient.GasPriceDiv,
-			ReceiptTimeout:      cfg.EthClient.ReceiptTimeout.Duration,
-			IntervalReceiptLoop: cfg.EthClient.IntervalReceiptLoop.Duration,
-		},
+		Ethereum: ethCfg,
 		Rollup: eth.RollupConfig{
 			Address: cfg.SmartContracts.Rollup,
 		},
@@ -121,10 +124,23 @@ })
 	if err != nil {
 		return nil, err
 	}
+	varsRollup, varsAuction, varsWDelayer := sync.SCVars()
+	initSCVars := synchronizer.SCVariables{
+		Rollup:   *varsRollup,
+		Auction:  *varsAuction,
+		WDelayer: *varsWDelayer,
+	}
+
+	scConsts := synchronizer.SCConsts{
+		Rollup:   *sync.RollupConstants(),
+		Auction:  *sync.AuctionConstants(),
+		WDelayer: *sync.WDelayerConstants(),
+	}
 
 	var coord *coordinator.Coordinator
+	var l2DB *l2db.L2DB
 	if mode == ModeCoordinator {
-		l2DB := l2db.NewL2DB(
+		l2DB = l2db.NewL2DB(
 			db,
 			coordCfg.L2DB.SafetyPeriod,
 			coordCfg.L2DB.MaxTxs,
@@ -148,16 +164,48 @@ serverProofs := make([]coordinator.ServerProofInterface, len(coordCfg.ServerProofs))
 		for i, serverProofCfg := range coordCfg.ServerProofs {
 			serverProofs[i] = coordinator.NewServerProof(serverProofCfg.URL)
 		}
+
 		coord = coordinator.NewCoordinator(
 			coordinator.Config{
 				ForgerAddress: coordCfg.ForgerAddress,
+				ConfirmBlocks: coordCfg.ConfirmBlocks,
 			},
 			historyDB,
 			txSelector,
 			batchBuilder,
 			serverProofs,
 			client,
+			&scConsts,
+			&initSCVars,
 		)
+	}
+	var nodeAPI *NodeAPI
+	if cfg.API.Address != "" {
+		server := gin.Default()
+		coord := false
+		if mode == ModeCoordinator {
+			coord = coordCfg.API.Coordinator
+		}
+		var err error
+		nodeAPI, err = NewNodeAPI(
+			cfg.API.Address,
+			coord, cfg.API.Explorer,
+			server,
+			historyDB,
+			stateDB,
+			l2DB,
+			&api.Config{
+				RollupConstants:   scConsts.Rollup,
+				AuctionConstants:  scConsts.Auction,
+				WDelayerConstants: scConsts.WDelayer,
+			},
+		)
+		if err != nil {
+			return nil, err
+		}
+		nodeAPI.api.SetRollupVariables(initSCVars.Rollup)
+		nodeAPI.api.SetAuctionVariables(initSCVars.Auction)
+		nodeAPI.api.SetWDelayerVariables(initSCVars.WDelayer)
 	}
 	var debugAPI *debugapi.DebugAPI
 	if cfg.Debug.APIAddress != "" {
@@ -165,6 +213,7 @@ debugAPI = debugapi.NewDebugAPI(cfg.Debug.APIAddress, stateDB, sync)
 	}
 	ctx, cancel := context.WithCancel(context.Background())
 	return &Node{
+		nodeAPI:  nodeAPI,
 		debugAPI: debugAPI,
 		coord:    coord,
 		coordCfg: coordCfg,
@@ -177,85 +226,137 @@ cancel:   cancel,
 	}, nil
 }
 
-// StartCoordinator starts the coordinator
-func (n *Node) StartCoordinator() {
-	log.Info("Starting Coordinator...")
+// NodeAPI holds the node http API
+type NodeAPI struct { //nolint:golint
+	api    *api.API
+	engine *gin.Engine
+	addr   string
+}
 
-	// TODO: Replace stopXXX by context
-	// TODO: Replace stoppedXXX by waitgroup
+func handleNoRoute(c *gin.Context) {
+	c.JSON(http.StatusNotFound, gin.H{
+		"error": "404 page not found",
+	})
+}
 
-	n.stopForge = make(chan bool)
-	n.stopGetProofCallForge = make(chan bool)
-	n.stopForgeCallConfirm = make(chan bool)
+// NewNodeAPI creates a new NodeAPI (which internally calls api.NewAPI)
+func NewNodeAPI(
+	addr string,
+	coordinatorEndpoints, explorerEndpoints bool,
+	server *gin.Engine,
+	hdb *historydb.HistoryDB,
+	sdb *statedb.StateDB,
+	l2db *l2db.L2DB,
+	config *api.Config,
+) (*NodeAPI, error) {
+	engine := gin.Default()
+	engine.NoRoute(handleNoRoute)
+	engine.Use(cors.Default())
+	_api, err := api.NewAPI(
+		coordinatorEndpoints, explorerEndpoints,
+		engine,
+		hdb,
+		sdb,
+		l2db,
+		config,
+	)
+	if err != nil {
+		return nil, err
+	}
+	return &NodeAPI{
+		addr:   addr,
+		api:    _api,
+		engine: engine,
+	}, nil
+}
 
-	n.stoppedForge = make(chan bool, 1)
-	n.stoppedGetProofCallForge = make(chan bool, 1)
-	n.stoppedForgeCallConfirm = make(chan bool, 1)
+// Run starts the http server of the NodeAPI.  To stop it, pass a context with
+// cancelation.
+func (a *NodeAPI) Run(ctx context.Context) error {
+	server := &http.Server{
+		Addr:    a.addr,
+		Handler: a.engine,
+		// TODO: Figure out best parameters for production
+		ReadTimeout:    30 * time.Second, //nolint:gomnd
+		WriteTimeout:   30 * time.Second, //nolint:gomnd
+		MaxHeaderBytes: 1 << 20,          //nolint:gomnd
+	}
+	go func() {
+		log.Infof("NodeAPI is ready at %v", a.addr)
+		if err := server.ListenAndServe(); err != nil &&
+			err != http.ErrServerClosed {
+			log.Fatalf("Listen: %s\n", err)
+		}
+	}()
+
+	<-ctx.Done()
+	log.Info("Stopping NodeAPI...")
+	ctxTimeout, cancel := context.WithTimeout(context.Background(), 10*time.Second) //nolint:gomnd
+	defer cancel()
+	if err := server.Shutdown(ctxTimeout); err != nil {
+		return err
+	}
+	log.Info("NodeAPI done")
+	return nil
+}
 
-	queueSize := 1
-	batchCh0 := make(chan *coordinator.BatchInfo, queueSize)
-	batchCh1 := make(chan *coordinator.BatchInfo, queueSize)
+// TODO(Edu): Consider keeping the `lastBlock` inside synchronizer so that we
+// don't have to pass it around.
+func (n *Node) syncLoopFn(lastBlock *common.Block) (*common.Block, time.Duration) {
+	if blockData, discarded, err := n.sync.Sync2(n.ctx, lastBlock); err != nil {
+		// case: error
+		log.Errorw("Synchronizer.Sync", "error", err)
+		return nil, n.cfg.Synchronizer.SyncLoopInterval.Duration
+	} else if discarded != nil {
+		// case: reorg
+		log.Infow("Synchronizer.Sync reorg", "discarded", *discarded)
+		if n.mode == ModeCoordinator {
+			n.coord.SendMsg(coordinator.MsgSyncReorg{})
+		}
+		if n.nodeAPI != nil {
+			rollup, auction, wDelayer := n.sync.SCVars()
+			n.nodeAPI.api.SetRollupVariables(*rollup)
+			n.nodeAPI.api.SetAuctionVariables(*auction)
+			n.nodeAPI.api.SetWDelayerVariables(*wDelayer)
 
-	go func() {
-		defer func() { n.stoppedForge <- true }()
-		for {
-			select {
-			case <-n.stopForge:
-				return
-			default:
-				if forge, err := n.coord.ForgeLoopFn(batchCh0, n.stopForge); err == coordinator.ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("Coordinator.ForgeLoopFn", "error", err)
-				} else if !forge {
-					time.Sleep(n.coordCfg.ForgeLoopInterval.Duration)
-				}
-			}
+			// TODO: n.nodeAPI.api.UpdateNetworkInfo()
 		}
-	}()
-	go func() {
-		defer func() { n.stoppedGetProofCallForge <- true }()
-		for {
-			select {
-			case <-n.stopGetProofCallForge:
-				return
-			default:
-				if err := n.coord.GetProofCallForgeLoopFn(
-					batchCh0, batchCh1, n.stopGetProofCallForge); err == coordinator.ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("Coordinator.GetProofCallForgeLoopFn", "error", err)
-				}
+		return nil, time.Duration(0)
+	} else if blockData != nil {
+		// case: new block
+		stats := n.sync.Stats()
+		if n.mode == ModeCoordinator {
+			if stats.Synced() && (blockData.Rollup.Vars != nil ||
+				blockData.Auction.Vars != nil ||
+				blockData.WDelayer.Vars != nil) {
+				n.coord.SendMsg(coordinator.MsgSyncSCVars{
+					Rollup:   blockData.Rollup.Vars,
+					Auction:  blockData.Auction.Vars,
+					WDelayer: blockData.WDelayer.Vars,
+				})
 			}
+			n.coord.SendMsg(coordinator.MsgSyncStats{
+				Stats: *stats,
+			})
 		}
-	}()
-	go func() {
-		defer func() { n.stoppedForgeCallConfirm <- true }()
-		for {
-			select {
-			case <-n.stopForgeCallConfirm:
-				return
-			default:
-				if err := n.coord.ForgeCallConfirmLoopFn(
-					batchCh1, n.stopForgeCallConfirm); err == coordinator.ErrStop {
-					return
-				} else if err != nil {
-					log.Errorw("Coordinator.ForgeCallConfirmLoopFn", "error", err)
-				}
+		if n.nodeAPI != nil {
+			if blockData.Rollup.Vars != nil {
+				n.nodeAPI.api.SetRollupVariables(*blockData.Rollup.Vars)
+			}
+			if blockData.Auction.Vars != nil {
+				n.nodeAPI.api.SetAuctionVariables(*blockData.Auction.Vars)
+			}
+			if blockData.WDelayer.Vars != nil {
+				n.nodeAPI.api.SetWDelayerVariables(*blockData.WDelayer.Vars)
 			}
-		}
-	}()
-}
 
-// StopCoordinator stops the coordinator
-func (n *Node) StopCoordinator() {
-	log.Info("Stopping Coordinator...")
-	n.stopForge <- true
-	n.stopGetProofCallForge <- true
-	n.stopForgeCallConfirm <- true
-	<-n.stoppedForge
-	<-n.stoppedGetProofCallForge
-	<-n.stoppedForgeCallConfirm
+			// TODO: n.nodeAPI.api.UpdateNetworkInfo()
+		}
+		return &blockData.Block, time.Duration(0)
+	} else {
+		// case: no block
+		return lastBlock, n.cfg.Synchronizer.SyncLoopInterval.Duration
+	}
 }
 
 // StartSynchronizer starts the synchronizer
@@ -263,32 +364,16 @@ func (n *Node) StartSynchronizer() {
 	log.Info("Starting Synchronizer...")
 	n.wg.Add(1)
 	go func() {
-		defer func() {
-			log.Info("Synchronizer routine stopped")
-			n.wg.Done()
-		}()
 		var lastBlock *common.Block
-		d := time.Duration(0)
+		waitDuration := time.Duration(0)
 		for {
 			select {
 			case <-n.ctx.Done():
 				log.Info("Synchronizer done")
+				n.wg.Done()
 				return
-			case <-time.After(d):
-				if blockData, discarded, err := n.sync.Sync2(n.ctx, lastBlock); err != nil {
-					log.Errorw("Synchronizer.Sync", "error", err)
-					lastBlock = nil
-					d = n.cfg.Synchronizer.SyncLoopInterval.Duration
-				} else if discarded != nil {
-					log.Infow("Synchronizer.Sync reorg", "discarded", *discarded)
-					lastBlock = nil
-					d = time.Duration(0)
-				} else if blockData != nil {
-					lastBlock = &blockData.Block
-					d = time.Duration(0)
-				} else {
-					d = n.cfg.Synchronizer.SyncLoopInterval.Duration
-				}
+			case <-time.After(waitDuration):
+				lastBlock, waitDuration = n.syncLoopFn(lastBlock)
 			}
 		}
 	}()
@@ -310,14 +395,33 @@ }
 	}()
 }
 
+// StartNodeAPI starts the NodeAPI
+func (n *Node) StartNodeAPI() {
+	log.Info("Starting NodeAPI...")
+	n.wg.Add(1)
+	go func() {
+		defer func() {
+			log.Info("NodeAPI routine stopped")
+			n.wg.Done()
+		}()
+		if err := n.nodeAPI.Run(n.ctx); err != nil {
+			log.Fatalw("NodeAPI.Run", "err", err)
+		}
+	}()
+}
+
 // Start the node
 func (n *Node) Start() {
 	log.Infow("Starting node...", "mode", n.mode)
 	if n.debugAPI != nil {
 		n.StartDebugAPI()
 	}
+	if n.nodeAPI != nil {
+		n.StartNodeAPI()
+	}
 	if n.mode == ModeCoordinator {
-		n.StartCoordinator()
+		log.Info("Starting Coordinator...")
+		n.coord.Start()
 	}
 	n.StartSynchronizer()
 }
@@ -327,7 +431,8 @@ func (n *Node) Stop() {
 	log.Infow("Stopping node...")
 	n.cancel()
 	if n.mode == ModeCoordinator {
-		n.StopCoordinator()
+		log.Info("Stopping Coordinator...")
+		n.coord.Stop()
 	}
 	n.wg.Wait()
 }

@@ -54,14 +54,27 @@ Sync struct {
 		Updated   time.Time
 		LastBlock int64
 		LastBatch int64
+		Auction   struct {
+			CurrentSlot common.Slot
+		}
 	}
 }
 
+// Synced returns true if the Synchronizer is up to date with the last ethereum block
+func (s *Stats) Synced() bool {
+	return s.Eth.LastBlock == s.Sync.LastBlock
+}
+
+// TODO(Edu): Consider removing all the mutexes from StatsHolder, make
+// Synchronizer.Stats not thread-safe, don't pass the synchronizer to the
+// debugAPI, and have a copy of the Stats in the DebugAPI that the node passes
+// when the Sync updates.
+
 // StatsHolder stores stats and that allows reading and writing them
 // concurrently
 type StatsHolder struct {
-	stats Stats
-	rw    sync.RWMutex
+	Stats
+	rw sync.RWMutex
 }
 
 // NewStatsHolder creates a new StatsHolder
@@ -69,18 +82,25 @@ func NewStatsHolder(firstBlock int64, refreshPeriod time.Duration) *StatsHolder {
 	stats := Stats{}
 	stats.Eth.RefreshPeriod = refreshPeriod
 	stats.Eth.FirstBlock = firstBlock
-	return &StatsHolder{stats: stats}
+	return &StatsHolder{Stats: stats}
+}
+
+// UpdateCurrentSlot updates the auction stats
+func (s *StatsHolder) UpdateCurrentSlot(slot common.Slot) {
+	s.rw.Lock()
+	s.Sync.Auction.CurrentSlot = slot
+	s.rw.Unlock()
 }
 
 // UpdateSync updates the synchronizer stats
 func (s *StatsHolder) UpdateSync(lastBlock int64, lastBatch *common.BatchNum) {
 	now := time.Now()
 	s.rw.Lock()
-	s.stats.Sync.LastBlock = lastBlock
+	s.Sync.LastBlock = lastBlock
 	if lastBatch != nil {
-		s.stats.Sync.LastBatch = int64(*lastBatch)
+		s.Sync.LastBatch = int64(*lastBatch)
 	}
-	s.stats.Sync.Updated = now
+	s.Sync.Updated = now
 	s.rw.Unlock()
 }
 
@@ -88,13 +108,13 @@ // UpdateEth updates the ethereum stats, only if the previous stats expired
 func (s *StatsHolder) UpdateEth(ethClient eth.ClientInterface) error {
 	now := time.Now()
 	s.rw.RLock()
-	elapsed := now.Sub(s.stats.Eth.Updated)
+	elapsed := now.Sub(s.Eth.Updated)
 	s.rw.RUnlock()
-	if elapsed < s.stats.Eth.RefreshPeriod {
+	if elapsed < s.Eth.RefreshPeriod {
 		return nil
 	}
 
-	lastBlock, err := ethClient.EthCurrentBlock()
+	lastBlock, err := ethClient.EthLastBlock()
 	if err != nil {
 		return err
 	}
@@ -103,9 +123,9 @@ if err != nil {
 		return err
 	}
 	s.rw.Lock()
-	s.stats.Eth.Updated = now
-	s.stats.Eth.LastBlock = lastBlock
-	s.stats.Eth.LastBatch = lastBatch
+	s.Eth.Updated = now
+	s.Eth.LastBlock = lastBlock
+	s.Eth.LastBatch = lastBatch
 	s.rw.Unlock()
 	return nil
 }
@@ -113,19 +133,27 @@
 // CopyStats returns a copy of the inner Stats
 func (s *StatsHolder) CopyStats() *Stats {
 	s.rw.RLock()
-	sCopy := s.stats
+	sCopy := s.Stats
+	if s.Sync.Auction.CurrentSlot.BidValue != nil {
+		sCopy.Sync.Auction.CurrentSlot.BidValue =
+			common.CopyBigInt(s.Sync.Auction.CurrentSlot.BidValue)
+	}
 	s.rw.RUnlock()
 	return &sCopy
 }
 
 func (s *StatsHolder) blocksPerc() float64 {
-	return float64(s.stats.Sync.LastBlock-s.stats.Eth.FirstBlock) * 100.0 /
-		float64(s.stats.Eth.LastBlock-s.stats.Eth.FirstBlock)
+	syncLastBlock := s.Sync.LastBlock
+	if s.Sync.LastBlock == 0 {
+		syncLastBlock = s.Eth.FirstBlock - 1
+	}
+	return float64(syncLastBlock-(s.Eth.FirstBlock-1)) * 100.0 /
+		float64(s.Eth.LastBlock-(s.Eth.FirstBlock-1))
 }
 
 func (s *StatsHolder) batchesPerc(batchNum int64) float64 {
 	return float64(batchNum) * 100.0 /
-		float64(s.stats.Eth.LastBatch)
+		float64(s.Eth.LastBatch)
 }
 
 // ConfigStartBlockNum sets the first block used to start tracking the smart
@@ -143,6 +171,13 @@ Auction  common.AuctionVariables  `validate:"required"`
 	WDelayer common.WDelayerVariables `validate:"required"`
 }
 
+// SCConsts joins all the smart contract constants in a single struct
+type SCConsts struct {
+	Rollup   common.RollupConstants
+	Auction  common.AuctionConstants
+	WDelayer common.WDelayerConstants
+}
+
 // Config is the Synchronizer configuration
 type Config struct {
 	StartBlockNum      ConfigStartBlockNum
@@ -152,16 +187,17 @@ }
 
 // Synchronizer implements the Synchronizer type
 type Synchronizer struct {
-	ethClient         eth.ClientInterface
-	auctionConstants  common.AuctionConstants
-	rollupConstants   common.RollupConstants
-	wDelayerConstants common.WDelayerConstants
-	historyDB         *historydb.HistoryDB
-	stateDB           *statedb.StateDB
-	cfg               Config
-	startBlockNum     int64
-	vars              SCVariables
-	stats             *StatsHolder
+	ethClient eth.ClientInterface
+	// auctionConstants  common.AuctionConstants
+	// rollupConstants   common.RollupConstants
+	// wDelayerConstants common.WDelayerConstants
+	consts        SCConsts
+	historyDB     *historydb.HistoryDB
+	stateDB       *statedb.StateDB
+	cfg           Config
+	startBlockNum int64
+	vars          SCVariables
+	stats         *StatsHolder
 	// firstSavedBlock  *common.Block
 	// mux sync.Mutex
 }
@@ -196,56 +232,113 @@ startBlockNum = cfg.StartBlockNum.WDelayer
 	}
 	stats := NewStatsHolder(startBlockNum, cfg.StatsRefreshPeriod)
 	s := &Synchronizer{
-		ethClient:         ethClient,
-		auctionConstants:  *auctionConstants,
-		rollupConstants:   *rollupConstants,
-		wDelayerConstants: *wDelayerConstants,
-		historyDB:         historyDB,
-		stateDB:           stateDB,
-		cfg:               cfg,
-		startBlockNum:     startBlockNum,
-		stats:             stats,
+		ethClient: ethClient,
+		consts: SCConsts{
+			Rollup:   *rollupConstants,
+			Auction:  *auctionConstants,
+			WDelayer: *wDelayerConstants,
+		},
+		historyDB:     historyDB,
+		stateDB:       stateDB,
+		cfg:           cfg,
+		startBlockNum: startBlockNum,
+		stats:         stats,
 	}
 	return s, s.init()
 }
 
-// Stats returns a copy of the Synchronizer Stats
+// Stats returns a copy of the Synchronizer Stats.  It is safe to call Stats()
+// during a Sync call
 func (s *Synchronizer) Stats() *Stats {
 	return s.stats.CopyStats()
 }
 
 // AuctionConstants returns the AuctionConstants read from the smart contract
 func (s *Synchronizer) AuctionConstants() *common.AuctionConstants {
-	return &s.auctionConstants
+	return &s.consts.Auction
 }
 
 // RollupConstants returns the RollupConstants read from the smart contract
 func (s *Synchronizer) RollupConstants() *common.RollupConstants {
-	return &s.rollupConstants
+	return &s.consts.Rollup
 }
 
 // WDelayerConstants returns the WDelayerConstants read from the smart contract
 func (s *Synchronizer) WDelayerConstants() *common.WDelayerConstants {
-	return &s.wDelayerConstants
+	return &s.consts.WDelayer
+}
+
+// SCVars returns a copy of the Smart Contract Variables
+func (s *Synchronizer) SCVars() (*common.RollupVariables, *common.AuctionVariables, *common.WDelayerVariables) {
+	return s.vars.Rollup.Copy(), s.vars.Auction.Copy(), s.vars.WDelayer.Copy()
 }
 
-func (s *Synchronizer) init() error {
-	rollup, auction, wDelayer, err := s.historyDB.GetSCVars()
-	// If SCVars are not in the HistoryDB, this is probably the first run
-	// of the Synchronizer: store the initial vars taken from config
-	if err == sql.ErrNoRows {
-		rollup = &s.cfg.InitialVariables.Rollup
-		auction = &s.cfg.InitialVariables.Auction
-		wDelayer = &s.cfg.InitialVariables.WDelayer
-		log.Info("Setting initial SCVars in HistoryDB")
-		if err = s.historyDB.SetInitialSCVars(rollup, auction, wDelayer); err != nil {
+func (s *Synchronizer) updateCurrentSlotIfSync(batchesLen int) error {
+	slot := common.Slot{
+		SlotNum:    s.stats.Sync.Auction.CurrentSlot.SlotNum,
+		BatchesLen: int(s.stats.Sync.Auction.CurrentSlot.BatchesLen),
+	}
+	// We want the next block because the current one is already mined
+	blockNum := s.stats.Sync.LastBlock + 1
+	slotNum := s.consts.Auction.SlotNum(blockNum)
+	if batchesLen == -1 {
+		dbBatchesLen, err := s.historyDB.GetBatchesLen(slotNum)
+		// fmt.Printf("DBG -1 from: %v, to: %v, len: %v\n", from, to, dbBatchesLen)
+		if err != nil {
+			log.Errorw("historyDB.GetBatchesLen", "err", err)
+			return err
+		}
+		slot.BatchesLen = dbBatchesLen
+	} else if slotNum > slot.SlotNum {
+		// fmt.Printf("DBG batchesLen Reset len: %v (%v %v)\n", batchesLen, slotNum, slot.SlotNum)
+		slot.BatchesLen = batchesLen
+	} else {
+		// fmt.Printf("DBG batchesLen add len: %v: %v\n", batchesLen, slot.BatchesLen+batchesLen)
+		slot.BatchesLen += batchesLen
+	}
+	slot.SlotNum = slotNum
+	slot.StartBlock, slot.EndBlock = s.consts.Auction.SlotBlocks(slot.SlotNum)
+	// If Synced, update the current coordinator
+	if s.stats.Synced() {
+		bidCoord, err := s.historyDB.GetBestBidCoordinator(slot.SlotNum)
+		if err != nil && err != sql.ErrNoRows {
+			return err
+		}
+		if err == sql.ErrNoRows {
+			slot.BootCoord = true
+			slot.Forger = s.vars.Auction.BootCoordinator
+			slot.URL = "???"
+		} else if err == nil {
+			slot.BidValue = bidCoord.BidValue
+			defaultSlotBid := bidCoord.DefaultSlotSetBid[slot.SlotNum%6]
+			if slot.BidValue.Cmp(defaultSlotBid) >= 0 {
+				slot.Bidder = bidCoord.Bidder
+				slot.Forger = bidCoord.Forger
+				slot.URL = bidCoord.URL
+			} else {
+				slot.BootCoord = true
+				slot.Forger = s.vars.Auction.BootCoordinator
+				slot.URL = "???"
+			}
+		}
+
+		// TODO: Remove this SANITY CHECK once this code is tested enough
+		// BEGIN SANITY CHECK
+		canForge, err := s.ethClient.AuctionCanForge(slot.Forger, blockNum)
+		if err != nil {
 			return err
 		}
+		if !canForge {
+			return fmt.Errorf("Synchronized value of forger address for closed slot "+
+				"differs from smart contract: %+v", slot)
+		}
+		// END SANITY CHECK
 	}
-	s.vars.Rollup = *rollup
-	s.vars.Auction = *auction
-	s.vars.WDelayer = *wDelayer
+	s.stats.UpdateCurrentSlot(slot)
+	return nil
+}
 
+func (s *Synchronizer) init() error {
 	// Update stats parameters so that they have valid values before the
 	// first Sync call
 	if err := s.stats.UpdateEth(s.ethClient); err != nil {
@@ -265,26 +358,20 @@ }
 	} else {
 		lastBlockNum = lastSavedBlock.EthBlockNum
 	}
-	lastBatchNum, err := s.historyDB.GetLastBatchNum()
-	if err != nil && err != sql.ErrNoRows {
+	if err := s.resetState(lastBlockNum); err != nil {
 		return err
-	}
-	if err == sql.ErrNoRows {
-		lastBatchNum = 0
 	}
 
-	s.stats.UpdateSync(lastBlockNum, &lastBatchNum)
-
 	log.Infow("Sync init block",
-		"syncLastBlock", s.stats.stats.Sync.LastBlock,
+		"syncLastBlock", s.stats.Sync.LastBlock,
 		"syncBlocksPerc", s.stats.blocksPerc(),
-		"ethFirstBlock", s.stats.stats.Eth.FirstBlock,
-		"ethLastBlock", s.stats.stats.Eth.LastBlock,
+		"ethFirstBlock", s.stats.Eth.FirstBlock,
+		"ethLastBlock", s.stats.Eth.LastBlock,
 	)
 	log.Infow("Sync init batch",
-		"syncLastBatch", s.stats.stats.Sync.LastBatch,
-		"syncBatchesPerc", s.stats.batchesPerc(s.stats.stats.Sync.LastBatch),
-		"ethLastBatch", s.stats.stats.Eth.LastBatch,
+		"syncLastBatch", s.stats.Sync.LastBatch,
+		"syncBatchesPerc", s.stats.batchesPerc(s.stats.Sync.LastBatch),
+		"ethLastBatch", s.stats.Eth.LastBatch,
 	)
 	return nil
 }
@@ -329,7 +416,7 @@ }
 
 	log.Debugw("Syncing...",
 		"block", nextBlockNum,
-		"ethLastBlock", s.stats.stats.Eth.LastBlock,
+		"ethLastBlock", s.stats.Eth.LastBlock,
 	)
 
 	// Check that the obtianed ethBlock.ParentHash == prevEthBlock.Hash; if not, reorg!
@@ -404,16 +491,19 @@ } else {
 		s.stats.UpdateSync(ethBlock.EthBlockNum,
 			&rollupData.Batches[batchesLen-1].Batch.BatchNum)
 	}
+	if err := s.updateCurrentSlotIfSync(len(rollupData.Batches)); err != nil {
+		return nil, nil, err
+	}
 	log.Debugw("Synced block",
-		"syncLastBlock", s.stats.stats.Sync.LastBlock,
+		"syncLastBlock", s.stats.Sync.LastBlock,
 		"syncBlocksPerc", s.stats.blocksPerc(),
-		"ethLastBlock", s.stats.stats.Eth.LastBlock,
+		"ethLastBlock", s.stats.Eth.LastBlock,
 	)
 	for _, batchData := range rollupData.Batches {
 		log.Debugw("Synced batch",
 			"syncLastBatch", batchData.Batch.BatchNum,
 			"syncBatchesPerc", s.stats.batchesPerc(int64(batchData.Batch.BatchNum)),
-			"ethLastBatch", s.stats.stats.Eth.LastBatch,
+			"ethLastBatch", s.stats.Eth.LastBatch,
 		)
 	}
 
@@ -431,11 +521,13 @@
 	for blockNum >= s.startBlockNum {
 		ethBlock, err := s.ethClient.EthBlockByNumber(context.Background(), blockNum)
 		if err != nil {
+			log.Errorw("ethClient.EthBlockByNumber", "err", err)
 			return 0, err
 		}
 
 		block, err := s.historyDB.GetBlock(blockNum)
 		if err != nil {
+			log.Errorw("historyDB.GetBlock", "err", err)
 			return 0, err
 		}
 		if block.Hash == ethBlock.Hash {
@@ -453,19 +545,51 @@ if err != nil {
 		return 0, err
 	}
 
+	if err := s.resetState(blockNum); err != nil {
+		return 0, err
+	}
+
+	return blockNum, nil
+}
+
+func (s *Synchronizer) resetState(blockNum int64) error {
+	rollup, auction, wDelayer, err := s.historyDB.GetSCVars()
+	// If SCVars are not in the HistoryDB, this is probably the first run
+	// of the Synchronizer: store the initial vars taken from config
+	if err == sql.ErrNoRows {
+		rollup = &s.cfg.InitialVariables.Rollup
+		auction = &s.cfg.InitialVariables.Auction
+		wDelayer = &s.cfg.InitialVariables.WDelayer
+		log.Info("Setting initial SCVars in HistoryDB")
+		if err = s.historyDB.SetInitialSCVars(rollup, auction, wDelayer); err != nil {
+			log.Errorw("historyDB.SetInitialSCVars", "err", err)
+			return err
+		}
+	}
+	s.vars.Rollup = *rollup
+	s.vars.Auction = *auction
+	s.vars.WDelayer = *wDelayer
+
 	batchNum, err := s.historyDB.GetLastBatchNum()
 	if err != nil && err != sql.ErrNoRows {
-		return 0, err
+		log.Errorw("historyDB.GetLastBatchNum", "err", err)
+		return err
 	}
 	if err == sql.ErrNoRows {
 		batchNum = 0
 	}
 	err = s.stateDB.Reset(batchNum)
 	if err != nil {
-		return 0, err
+		log.Errorw("stateDB.Reset", "err", err)
+		return err
 	}
 
-	return blockNum, nil
+	s.stats.UpdateSync(blockNum, &batchNum)
+
+	if err := s.updateCurrentSlotIfSync(-1); err != nil {
+		return err
+	}
+	return nil
 }
 
 // TODO: Figure out who will use the Status output, and only return what's strictly need
@@ -500,7 +624,7 @@ }
 	status.CurrentBatch = lastSavedBatch
 
 	// Get latest blockNum in blockchain
-	latestBlockNum, err := s.ethClient.EthCurrentBlock()
+	latestBlockNum, err := s.ethClient.EthLastBlock()
 	if err != nil {
 		return nil, err
 	}
@@ -664,9 +788,9 @@ }
 		batchData.CreatedAccounts = processTxsOut.CreatedAccounts
 
 		slotNum := int64(0)
-		if ethBlock.EthBlockNum >= s.auctionConstants.GenesisBlockNum {
-			slotNum = (ethBlock.EthBlockNum - s.auctionConstants.GenesisBlockNum) /
-				int64(s.auctionConstants.BlocksPerSlot)
+		if ethBlock.EthBlockNum >= s.consts.Auction.GenesisBlockNum {
+			slotNum = (ethBlock.EthBlockNum - s.consts.Auction.GenesisBlockNum) /
+				int64(s.consts.Auction.BlocksPerSlot)
 		}
 
 		// Get Batch information
@@ -831,6 +955,7 @@ return nil, fmt.Errorf("unexpected SlotSet in "+
 				"auctionEvents.NewDefaultSlotSetBid: %v", evt.SlotSet)
 		}
 		s.vars.Auction.DefaultSlotSetBid[evt.SlotSet] = evt.NewInitialMinBid
+		s.vars.Auction.DefaultSlotSetBidSlotNum = s.consts.Auction.SlotNum(blockNum) + int64(s.vars.Auction.ClosedAuctionSlots) + 1
 		varsUpdate = true
 	}
 

@@ -535,7 +535,7 @@
 	for i := 0; i < 4; i++ {
 		client.CtlRollback()
 	}
-	blockNum := client.CtlCurrentBlock()
+	blockNum := client.CtlLastBlock()
 	require.Equal(t, int64(1), blockNum)
 
 	// Generate extra required data

@@ -126,7 +126,9 @@ }()
 
 	<-ctx.Done()
 	log.Info("Stopping DebugAPI...")
-	if err := debugAPIServer.Shutdown(context.Background()); err != nil {
+	ctxTimeout, cancel := context.WithTimeout(context.Background(), 10*time.Second) //nolint:gomnd
+	defer cancel()
+	if err := debugAPIServer.Shutdown(ctxTimeout); err != nil {
 		return err
 	}
 	log.Info("DebugAPI done")

@@ -166,6 +166,7 @@ return false, fmt.Errorf("Auction has not started yet")
 	}
 
 	slotToForge := a.getSlotNumber(blockNum)
+	// fmt.Printf("DBG canForge slot: %v\n", slotToForge)
 	// Get the relativeBlock to check if the slotDeadline has been exceeded
 	relativeBlock := blockNum - (a.Constants.GenesisBlockNum + (slotToForge * int64(a.Constants.BlocksPerSlot)))
 
@@ -551,15 +552,15 @@ //
 // Ethereum
 //
 
-// CtlCurrentBlock returns the current blockNum without checks
-func (c *Client) CtlCurrentBlock() int64 {
+// CtlLastBlock returns the last blockNum without checks
+func (c *Client) CtlLastBlock() int64 {
 	c.rw.RLock()
 	defer c.rw.RUnlock()
 	return c.blockNum
 }
 
-// EthCurrentBlock returns the current blockNum
-func (c *Client) EthCurrentBlock() (int64, error) {
+// EthLastBlock returns the last blockNum
+func (c *Client) EthLastBlock() (int64, error) {
 	c.rw.RLock()
 	defer c.rw.RUnlock()
 

@@ -40,7 +40,7 @@ func TestClientEth(t *testing.T) {
 	var timer timer
 	clientSetup := NewClientSetupExample()
 	c := NewClient(true, &timer, &ethCommon.Address{}, clientSetup)
-	blockNum, err := c.EthCurrentBlock()
+	blockNum, err := c.EthLastBlock()
 	require.Nil(t, err)
 	assert.Equal(t, int64(1), blockNum)
 
@@ -126,7 +126,7 @@ assert.Nil(t, err)
 
 	c.CtlMineBlock()
 
-	blockNum, err := c.EthCurrentBlock()
+	blockNum, err := c.EthLastBlock()
 	require.Nil(t, err)
 
 	auctionEvents, _, err := c.AuctionEventsByBlock(blockNum)
@@ -168,7 +168,7 @@ require.Nil(t, err)
 	}
 	c.CtlMineBlock()
 
-	blockNum, err := c.EthCurrentBlock()
+	blockNum, err := c.EthLastBlock()
 	require.Nil(t, err)
 	rollupEvents, _, err := c.RollupEventsByBlock(blockNum)
 	require.Nil(t, err)
@@ -189,7 +189,7 @@ L1Batch:           true,
 	})
 	c.CtlMineBlock()
 
-	blockNumA, err := c.EthCurrentBlock()
+	blockNumA, err := c.EthLastBlock()
 	require.Nil(t, err)
 	rollupEvents, hashA, err := c.RollupEventsByBlock(blockNumA)
 	require.Nil(t, err)
@@ -202,7 +202,7 @@
 	c.CtlRollback()
 	c.CtlMineBlock()
 
-	blockNumB, err := c.EthCurrentBlock()
+	blockNumB, err := c.EthLastBlock()
 	require.Nil(t, err)
 	rollupEvents, hashB, err := c.RollupEventsByBlock(blockNumA)
 	require.Nil(t, err)
@@ -229,7 +229,7 @@ c.CtlMineBlock()
 
 	// Retrieve ForgeBatchArguments starting from the events
 
-	blockNum, err = c.EthCurrentBlock()
+	blockNum, err = c.EthLastBlock()
 	require.Nil(t, err)
 	rollupEvents, _, err = c.RollupEventsByBlock(blockNum)
 	require.Nil(t, err)