diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..6c0ae4a
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,29 @@
+name: goreleaser
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      -
+        name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.goreleaser.yml b/.goreleaser.yml
new file mode 100644
index 0000000..8f5efec
--- /dev/null
+++ b/.goreleaser.yml
@@ -0,0 +1,36 @@
+before:
+  hooks:
+    - go mod download
+
+builds:
+  - main: ./cli/node/main.go
+    binary: node
+    id: node
+    goos:
+      - linux
+      - darwin
+      - windows
+    hooks:
+      pre: make migration-pack
+      post: make migration-clean
+
+archives:
+  - replacements:
+      darwin: Darwin
+      linux: Linux
+      windows: Windows
+      386: i386
+      amd64: x86_64
+
+checksum:
+  name_template: 'checksums.txt'
+
+snapshot:
+  name_template: "{{ .Tag }}-next"
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..29ebfa5
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
+this license.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
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+
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+works, such as semiconductor masks.
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+makes it unnecessary.
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+
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+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
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+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
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+  You may convey a work based on the Program, or the modifications to
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+terms of section 4, provided that you also meet all of these conditions:
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+    it, and giving a relevant date.
+
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+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
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+works, which are not by their nature extensions of the covered work,
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+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
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+
+  "Additional permissions" are terms that supplement the terms of this
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+Additional permissions that are applicable to the entire Program shall
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+
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+sale, or importing the Program or any portion of it.
+
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+you grant is automatically extended to all recipients of the covered
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+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
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+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 9544cc3..97489e0 100644
--- a/Makefile
+++ b/Makefile
@@ -3,8 +3,8 @@
 # Project variables.
 PACKAGE := github.com/hermeznetwork/hermez-node
 VERSION := $(shell git describe --tags --always)
-BUILD := $(shell git rev-parse --short HEAD)
-BUILD_DATE := $(shell date +%Y-%m-%dT%H:%M:%S%z)
+COMMIT := $(shell git rev-parse --short HEAD)
+DATE := $(shell date +%Y-%m-%dT%H:%M:%S%z)
 PROJECT_NAME := $(shell basename "$(PWD)")
 
 # Go related variables.
@@ -23,7 +23,7 @@ CONFIG ?= $(GOBASE)/cli/node/cfg.buidler.toml
 POSTGRES_PASS ?= yourpasswordhere
 
 # Use linker flags to provide version/build settings.
-LDFLAGS=-ldflags "-X=main.Version=$(VERSION) -X=main.Build=$(BUILD) -X=main.Date=$(BUILD_DATE)"
+LDFLAGS=-ldflags "-X main.version=$(VERSION) -X main.commit=$(COMMIT) -X main.date=$(DATE)"
 
 # PID file will keep the process id of the server.
 PID_PROOF_MOCK := /tmp/.$(PROJECT_NAME).proof.pid
@@ -94,11 +94,11 @@ install:
 	@echo "  >  Checking if there is any missing dependencies..."
 	$(GOENVVARS) go get $(GOCMD)/... $(get)
 
-## run: Run Hermez node.
-run:
+## run-node: Run Hermez node.
+run-node:
 	@bash -c "$(MAKE) clean build"
 	@echo "  >  Running $(PROJECT_NAME)"
-	@$(GOBIN)/$(GOBINARY) --mode $(MODE) --cfg $(CONFIG) run
+	@$(GOBIN)/$(GOBINARY) run --mode $(MODE) --cfg $(CONFIG)
 
 ## run-proof-mock: Run proof server mock API.
 run-proof-mock: stop-proof-mock
diff --git a/README.md b/README.md
index 12b0a21..38e0673 100644
--- a/README.md
+++ b/README.md
@@ -25,13 +25,13 @@ there are more information about the config file into [cli/node/README.md](cli/n
 After setting the config, you can build and run the Hermez Node as a synchronizer:
 
 ```shell
-$ make run
+$ make run-node
 ```
 
 Or build and run as a coordinator, and also passing the config file from other location:
 
 ```shell
-$ MODE=sync CONFIG=cli/node/cfg.buidler.toml make run
+$ MODE=sync CONFIG=cli/node/cfg.buidler.toml make run-node
 ```
 
 To check the useful make commands:
diff --git a/cli/node/README.md b/cli/node/README.md
index 82756c7..0b8a8a9 100644
--- a/cli/node/README.md
+++ b/cli/node/README.md
@@ -24,6 +24,7 @@ COMMANDS:
    genbjj     Generate a new BabyJubJub key
    wipesql    Wipe the SQL DB (HistoryDB and L2DB) and the StateDBs, leaving the DB in a clean state
    run        Run the hermez-node in the indicated mode
+   serveapi   Serve the API only
    discard    Discard blocks up to a specified block number
    help, h    Shows a list of commands or help for one command
 
@@ -54,6 +55,10 @@ To read the documentation of each configuration parameter, please check the
 with `Coordinator` are only used in coord mode, and don't need to be defined
 when running the coordinator in sync mode
 
+When running the API in standalone mode, the required configuration is a subset
+of the node configuration.  Please, check the `type APIServer` at
+[config/config.go](../../config/config.go) to learn about all the parametes.
+
 ### Notes
 
 - The private key corresponding to the parameter `Coordinator.ForgerAddress` needs to be imported in the ethereum keystore
@@ -68,6 +73,9 @@ when running the coordinator in sync mode
   monitor the size of the folder to avoid running out of space.
 - The node requires a PostgreSQL database.  The parameters of the server and
   database must be set in the `PostgreSQL` section.
+- The node requires a web3 RPC server to work.  The node has only been tested
+  with geth and may not work correctly with other ethereum nodes
+  implementations.
 
 ## Building
 
@@ -107,6 +115,14 @@ Run the node in mode coordinator:
 ./node run --mode coord --cfg cfg.buidler.toml
 ```
 
+Serve the API in standalone mode.  This command allows serving the API just
+with access to the PostgreSQL database that a node is using.  Several instances
+of `serveapi` can be running at the same time with a single PostgreSQL
+database:
+```shell
+./node serveapi --mode coord --cfg cfg.buidler.toml
+```
+
 Import an ethereum private key into the keystore:
 ```shell
 ./node importkey --mode coord --cfg cfg.buidler.toml --privatekey  0x618b35096c477aab18b11a752be619f0023a539bb02dd6c813477a6211916cde
diff --git a/cli/node/load-sk-example.sh b/cli/node/load-sk-example.sh
index 03f5ad7..3f99342 100755
--- a/cli/node/load-sk-example.sh
+++ b/cli/node/load-sk-example.sh
@@ -1,10 +1,10 @@
 #!/bin/sh
 
 # Non-Boot Coordinator
-go run . --mode coord --cfg cfg.buidler.toml importkey --privatekey 0x30f5fddb34cd4166adb2c6003fa6b18f380fd2341376be42cf1c7937004ac7a3
+go run . importkey --mode coord --cfg cfg.buidler.toml --privatekey 0x30f5fddb34cd4166adb2c6003fa6b18f380fd2341376be42cf1c7937004ac7a3
 
 # Boot Coordinator
-go run . --mode coord --cfg cfg.buidler.toml importkey --privatekey 0xa8a54b2d8197bc0b19bb8a084031be71835580a01e70a45a13babd16c9bc1563
+go run . importkey --mode coord --cfg cfg.buidler.toml --privatekey 0xa8a54b2d8197bc0b19bb8a084031be71835580a01e70a45a13babd16c9bc1563
 
 # FeeAccount
-go run . --mode coord --cfg cfg.buidler.toml importkey --privatekey 0x3a9270c020e169097808da4b02e8d9100be0f8a38cfad3dcfc0b398076381fdd
+go run . importkey --mode coord --cfg cfg.buidler.toml --privatekey 0x3a9270c020e169097808da4b02e8d9100be0f8a38cfad3dcfc0b398076381fdd
diff --git a/cli/node/main.go b/cli/node/main.go
index 9261fb7..619dbab 100644
--- a/cli/node/main.go
+++ b/cli/node/main.go
@@ -35,18 +35,18 @@ const (
 )
 
 var (
-	// Version represents the program based on the git tag
-	Version = "v0.1.0"
-	// Build represents the program based on the git commit
-	Build = "dev"
-	// Date represents the date of application was built
-	Date = ""
+	// version represents the program based on the git tag
+	version = "v0.1.0"
+	// commit represents the program based on the git commit
+	commit = "dev"
+	// date represents the date of application was built
+	date = ""
 )
 
 func cmdVersion(c *cli.Context) error {
-	fmt.Printf("Version = \"%v\"\n", Version)
-	fmt.Printf("Build = \"%v\"\n", Build)
-	fmt.Printf("Date = \"%v\"\n", Date)
+	fmt.Printf("Version = \"%v\"\n", version)
+	fmt.Printf("Build = \"%v\"\n", commit)
+	fmt.Printf("Date = \"%v\"\n", date)
 	return nil
 }
 
@@ -421,7 +421,7 @@ func getConfigAPIServer(c *cli.Context) (*ConfigAPIServer, error) {
 func main() {
 	app := cli.NewApp()
 	app.Name = "hermez-node"
-	app.Version = Version
+	app.Version = version
 	flags := []cli.Flag{
 		&cli.StringFlag{
 			Name:     flagMode,
@@ -485,6 +485,7 @@ func main() {
 			Aliases: []string{},
 			Usage:   "Serve the API only",
 			Action:  cmdServeAPI,
+			Flags:   flags,
 		},
 		{
 			Name:    "discard",
diff --git a/config/config.go b/config/config.go
index 77807f7..419617f 100644
--- a/config/config.go
+++ b/config/config.go
@@ -299,7 +299,8 @@ type Node struct {
 	} `validate:"required"`
 	PostgreSQL PostgreSQL `validate:"required"`
 	Web3       struct {
-		// URL is the URL of the web3 ethereum-node RPC server
+		// URL is the URL of the web3 ethereum-node RPC server.  Only
+		// geth is officially supported.
 		URL string `validate:"required"`
 	} `validate:"required"`
 	Synchronizer struct {
diff --git a/coordinator/coordinator.go b/coordinator/coordinator.go
index a5a60ed..29e2c65 100644
--- a/coordinator/coordinator.go
+++ b/coordinator/coordinator.go
@@ -1,3 +1,43 @@
+/*
+Package coordinator handles all the logic related to forging batches as a
+coordinator in the hermez network.
+
+The forging of batches is done with a pipeline in order to allow multiple
+batches being forged in parallel.  The maximum number of batches that can be
+forged in parallel is determined by the number of available proof servers.
+
+The Coordinator begins with the pipeline stopped.  The main Coordinator
+goroutine keeps listening for synchronizer events sent by the node package,
+which allow the coordinator to determine if the configured forger address is
+allowed to forge at the current block or not.  When the forger address becomes
+allowed to forge, the pipeline is started, and when it terminates being allowed
+to forge, the pipeline is stopped.
+
+The Pipeline consists of two goroutines.  The first one is in charge of
+preparing a batch internally, which involves making a selection of transactions
+and calculating the ZKInputs for the batch proof, and sending these ZKInputs to
+an idle proof server.  This goroutine will keep preparing batches while there
+are idle proof servers, if the forging policy determines that a batch should be
+forged in the current state.  The second goroutine is in charge of waiting for
+the proof server to finish computing the proof, retreiving it, prepare the
+arguments for the `forgeBatch` Rollup transaction, and sending the result to
+the TxManager.  All the batch information moves between functions and
+goroutines via the BatchInfo struct.
+
+Finally, the TxManager contains a single goroutine that makes forgeBatch
+ethereum transactions for the batches sent by the Pipeline, and keeps them in a
+list to check them periodically.  In the periodic checks, the ethereum
+transaction is checked for successfulness, and it's only forgotten after a
+number of confirmation blocks have passed after being successfully mined.  At
+any point if a transaction failure is detected, the TxManager can signal the
+Coordinator to reset the Pipeline in order to reforge the failed batches.
+
+The Coordinator goroutine acts as a manager.  The synchronizer events (which
+notify about new blocks and associated new state) that it receives are
+broadcasted to the Pipeline and the TxManager.  This allows the Coordinator,
+Pipeline and TxManager to have a copy of the current hermez network state
+required to perform their duties.
+*/
 package coordinator
 
 import (
diff --git a/eth/auction.go b/eth/auction.go
index 0c439df..c47ad74 100644
--- a/eth/auction.go
+++ b/eth/auction.go
@@ -260,7 +260,7 @@ type AuctionInterface interface {
 
 	AuctionConstants() (*common.AuctionConstants, error)
 	AuctionEventsByBlock(blockNum int64, blockHash *ethCommon.Hash) (*AuctionEvents, error)
-	AuctionEventInit() (*AuctionEventInitialize, int64, error)
+	AuctionEventInit(genesisBlockNum int64) (*AuctionEventInitialize, int64, error)
 }
 
 //
@@ -809,12 +809,14 @@ var (
 )
 
 // AuctionEventInit returns the initialize event with its corresponding block number
-func (c *AuctionClient) AuctionEventInit() (*AuctionEventInitialize, int64, error) {
+func (c *AuctionClient) AuctionEventInit(genesisBlockNum int64) (*AuctionEventInitialize, int64, error) {
 	query := ethereum.FilterQuery{
 		Addresses: []ethCommon.Address{
 			c.address,
 		},
-		Topics: [][]ethCommon.Hash{{logAuctionInitialize}},
+		FromBlock: big.NewInt(max(0, genesisBlockNum-blocksPerDay)),
+		ToBlock:   big.NewInt(genesisBlockNum),
+		Topics:    [][]ethCommon.Hash{{logAuctionInitialize}},
 	}
 	logs, err := c.client.client.FilterLogs(context.Background(), query)
 	if err != nil {
diff --git a/eth/auction_test.go b/eth/auction_test.go
index 27a2f1c..2ae8520 100644
--- a/eth/auction_test.go
+++ b/eth/auction_test.go
@@ -28,7 +28,7 @@ func TestAuctionGetCurrentSlotNumber(t *testing.T) {
 }
 
 func TestAuctionEventInit(t *testing.T) {
-	auctionInit, blockNum, err := auctionClientTest.AuctionEventInit()
+	auctionInit, blockNum, err := auctionClientTest.AuctionEventInit(genesisBlock)
 	require.NoError(t, err)
 	assert.Equal(t, int64(18), blockNum)
 	assert.Equal(t, donationAddressConst, auctionInit.DonationAddress)
diff --git a/eth/client.go b/eth/client.go
index c67ff46..85c0201 100644
--- a/eth/client.go
+++ b/eth/client.go
@@ -12,6 +12,17 @@ import (
 
 var errTODO = fmt.Errorf("TODO: Not implemented yet")
 
+const (
+	blocksPerDay = (3600 * 24) / 15
+)
+
+func max(x, y int64) int64 {
+	if x > y {
+		return x
+	}
+	return y
+}
+
 // ClientInterface is the eth Client interface used by hermez-node modules to
 // interact with Ethereum Blockchain and smart contracts.
 type ClientInterface interface {
diff --git a/eth/rollup.go b/eth/rollup.go
index 183d07a..9cdfe27 100644
--- a/eth/rollup.go
+++ b/eth/rollup.go
@@ -273,7 +273,7 @@ type RollupInterface interface {
 	RollupConstants() (*common.RollupConstants, error)
 	RollupEventsByBlock(blockNum int64, blockHash *ethCommon.Hash) (*RollupEvents, error)
 	RollupForgeBatchArgs(ethCommon.Hash, uint16) (*RollupForgeBatchArgs, *ethCommon.Address, error)
-	RollupEventInit() (*RollupEventInitialize, int64, error)
+	RollupEventInit(genesisBlockNum int64) (*RollupEventInitialize, int64, error)
 }
 
 //
@@ -749,12 +749,14 @@ var (
 )
 
 // RollupEventInit returns the initialize event with its corresponding block number
-func (c *RollupClient) RollupEventInit() (*RollupEventInitialize, int64, error) {
+func (c *RollupClient) RollupEventInit(genesisBlockNum int64) (*RollupEventInitialize, int64, error) {
 	query := ethereum.FilterQuery{
 		Addresses: []ethCommon.Address{
 			c.address,
 		},
-		Topics: [][]ethCommon.Hash{{logHermezInitialize}},
+		FromBlock: big.NewInt(max(0, genesisBlockNum-blocksPerDay)),
+		ToBlock:   big.NewInt(genesisBlockNum),
+		Topics:    [][]ethCommon.Hash{{logHermezInitialize}},
 	}
 	logs, err := c.client.client.FilterLogs(context.Background(), query)
 	if err != nil {
diff --git a/eth/rollup_test.go b/eth/rollup_test.go
index 8a16b94..9799933 100644
--- a/eth/rollup_test.go
+++ b/eth/rollup_test.go
@@ -56,7 +56,7 @@ func genKeysBjj(i int64) *keys {
 }
 
 func TestRollupEventInit(t *testing.T) {
-	rollupInit, blockNum, err := rollupClient.RollupEventInit()
+	rollupInit, blockNum, err := rollupClient.RollupEventInit(genesisBlock)
 	require.NoError(t, err)
 	assert.Equal(t, int64(19), blockNum)
 	assert.Equal(t, uint8(10), rollupInit.ForgeL1L2BatchTimeout)
diff --git a/eth/wdelayer.go b/eth/wdelayer.go
index a583893..a2869f8 100644
--- a/eth/wdelayer.go
+++ b/eth/wdelayer.go
@@ -137,7 +137,7 @@ type WDelayerInterface interface {
 
 	WDelayerEventsByBlock(blockNum int64, blockHash *ethCommon.Hash) (*WDelayerEvents, error)
 	WDelayerConstants() (*common.WDelayerConstants, error)
-	WDelayerEventInit() (*WDelayerEventInitialize, int64, error)
+	WDelayerEventInit(genesisBlockNum int64) (*WDelayerEventInitialize, int64, error)
 }
 
 //
@@ -415,12 +415,14 @@ var (
 )
 
 // WDelayerEventInit returns the initialize event with its corresponding block number
-func (c *WDelayerClient) WDelayerEventInit() (*WDelayerEventInitialize, int64, error) {
+func (c *WDelayerClient) WDelayerEventInit(genesisBlockNum int64) (*WDelayerEventInitialize, int64, error) {
 	query := ethereum.FilterQuery{
 		Addresses: []ethCommon.Address{
 			c.address,
 		},
-		Topics: [][]ethCommon.Hash{{logWDelayerInitialize}},
+		FromBlock: big.NewInt(max(0, genesisBlockNum-blocksPerDay)),
+		ToBlock:   big.NewInt(genesisBlockNum),
+		Topics:    [][]ethCommon.Hash{{logWDelayerInitialize}},
 	}
 	logs, err := c.client.client.FilterLogs(context.Background(), query)
 	if err != nil {
diff --git a/eth/wdelayer_test.go b/eth/wdelayer_test.go
index 54e1862..a04ab00 100644
--- a/eth/wdelayer_test.go
+++ b/eth/wdelayer_test.go
@@ -18,7 +18,7 @@ var maxEmergencyModeTime = time.Hour * 24 * 7 * 26
 var maxWithdrawalDelay = time.Hour * 24 * 7 * 2
 
 func TestWDelayerInit(t *testing.T) {
-	wDelayerInit, blockNum, err := wdelayerClientTest.WDelayerEventInit()
+	wDelayerInit, blockNum, err := wdelayerClientTest.WDelayerEventInit(genesisBlock)
 	require.NoError(t, err)
 	assert.Equal(t, int64(16), blockNum)
 	assert.Equal(t, uint64(initWithdrawalDelay), wDelayerInit.InitialWithdrawalDelay)
diff --git a/node/node.go b/node/node.go
index 61bea3f..3445933 100644
--- a/node/node.go
+++ b/node/node.go
@@ -1,3 +1,18 @@
+/*
+Package node does the initialization of all the required objects to either run
+as a synchronizer or as a coordinator.
+
+The Node contains several goroutines that run in the background or that
+periodically perform tasks.  One of this goroutines periodically calls the
+`Synchronizer.Sync` function, allowing the synchronization of one block at a
+time.  After every call to `Synchronizer.Sync`, the Node sends a message to the
+Coordinator to notify it about the new synced block (and associated state) or
+reorg (and resetted state) in case one happens.
+
+Other goroutines perform tasks such as: updating the token prices, update
+metrics stored in the historyDB, update recommended fee stored in the
+historyDB, run the http API server, run the debug http API server, etc.
+*/
 package node
 
 import (
diff --git a/synchronizer/synchronizer.go b/synchronizer/synchronizer.go
index 3a7e009..b9fb5fe 100644
--- a/synchronizer/synchronizer.go
+++ b/synchronizer/synchronizer.go
@@ -1,3 +1,35 @@
+/*
+Package synchronizer synchronizes the hermez network state by querying events
+emitted by the three smart contracts: `Hermez.sol` (referred as Rollup here),
+`HermezAuctionProtocol.sol` (referred as Auction here) and
+`WithdrawalDelayer.sol` (referred as WDelayer here).
+
+The main entry point for synchronization is the `Sync` function, which at most
+will synchronize one ethereum block, and all the hermez events that happened in
+that block.  During a `Sync` call, a reorg can be detected; in such case, uncle
+blocks will be discarded, and only in a future `Sync` call correct blocks will
+be synced.
+
+The synchronization of the events in each smart contracts are done
+in the methods `rollupSync`, `auctionSync` and `wdelayerSync`, which in turn
+use the interface code to read each smart contract state and events found in
+"github.com/hermeznetwork/hermez-node/eth".  After these three methods are
+called, an object of type `common.BlockData` is built containing all the
+updates and events that happened in that block, and it is inserted in the
+HistoryDB in a single SQL transaction.
+
+`rollupSync` is the method that synchronizes batches sent via the `forgeBatch`
+transaction in `Hermez.sol`.  In `rollupSync`, for every batch,  the accounts
+state is updated in the StateDB by processing all transactions that have been
+forged in that batch.
+
+The consistency of the stored data is guaranteed by the HistoryDB: All the
+block information is inserted in a single SQL transaction at the end of the
+`Sync` method, once the StateDB has been updated.  And every time the
+Synchronizer starts, it continues from the last block in the HistoryDB.  The
+StateDB stores updates organized by checkpoints for every batch, and each batch
+is only accessed if it appears in the HistoryDB.
+*/
 package synchronizer
 
 import (
@@ -704,15 +736,15 @@ func (s *Synchronizer) reorg(uncleBlock *common.Block) (int64, error) {
 
 func getInitialVariables(ethClient eth.ClientInterface,
 	consts *common.SCConsts) (*common.SCVariables, *StartBlockNums, error) {
-	rollupInit, rollupInitBlock, err := ethClient.RollupEventInit()
+	rollupInit, rollupInitBlock, err := ethClient.RollupEventInit(consts.Auction.GenesisBlockNum)
 	if err != nil {
 		return nil, nil, tracerr.Wrap(fmt.Errorf("RollupEventInit: %w", err))
 	}
-	auctionInit, auctionInitBlock, err := ethClient.AuctionEventInit()
+	auctionInit, auctionInitBlock, err := ethClient.AuctionEventInit(consts.Auction.GenesisBlockNum)
 	if err != nil {
 		return nil, nil, tracerr.Wrap(fmt.Errorf("AuctionEventInit: %w", err))
 	}
-	wDelayerInit, wDelayerInitBlock, err := ethClient.WDelayerEventInit()
+	wDelayerInit, wDelayerInitBlock, err := ethClient.WDelayerEventInit(consts.Auction.GenesisBlockNum)
 	if err != nil {
 		return nil, nil, tracerr.Wrap(fmt.Errorf("WDelayerEventInit: %w", err))
 	}
diff --git a/test/ethclient.go b/test/ethclient.go
index 650627e..d2d2762 100644
--- a/test/ethclient.go
+++ b/test/ethclient.go
@@ -1152,7 +1152,7 @@ func (c *Client) RollupEventsByBlock(blockNum int64,
 }
 
 // RollupEventInit returns the initialize event with its corresponding block number
-func (c *Client) RollupEventInit() (*eth.RollupEventInitialize, int64, error) {
+func (c *Client) RollupEventInit(genesisBlockNum int64) (*eth.RollupEventInitialize, int64, error) {
 	vars := c.blocks[0].Rollup.Vars
 	return &eth.RollupEventInitialize{
 		ForgeL1L2BatchTimeout: uint8(vars.ForgeL1L2BatchTimeout),
@@ -1628,7 +1628,7 @@ func (c *Client) AuctionEventsByBlock(blockNum int64,
 }
 
 // AuctionEventInit returns the initialize event with its corresponding block number
-func (c *Client) AuctionEventInit() (*eth.AuctionEventInitialize, int64, error) {
+func (c *Client) AuctionEventInit(genesisBlockNum int64) (*eth.AuctionEventInitialize, int64, error) {
 	vars := c.blocks[0].Auction.Vars
 	return &eth.AuctionEventInitialize{
 		DonationAddress:        vars.DonationAddress,
@@ -1863,7 +1863,7 @@ func (c *Client) WDelayerConstants() (*common.WDelayerConstants, error) {
 }
 
 // WDelayerEventInit returns the initialize event with its corresponding block number
-func (c *Client) WDelayerEventInit() (*eth.WDelayerEventInitialize, int64, error) {
+func (c *Client) WDelayerEventInit(genesisBlockNum int64) (*eth.WDelayerEventInitialize, int64, error) {
 	vars := c.blocks[0].WDelayer.Vars
 	return &eth.WDelayerEventInitialize{
 		InitialWithdrawalDelay:         vars.WithdrawalDelay,