diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..ba5443b
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,142 @@
+on:
+  pull_request:
+  push:
+    tags:
+      - 'v*'
+
+name: CI
+
+jobs:
+  check:
+    name: Check
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - uses: dtolnay/rust-toolchain@1.74.1
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo check --workspace --all-features
+
+  fmt:
+    name: Rustfmt
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@1.74.1
+        with:
+          components: rustfmt
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo fmt --all -- --check
+
+  clippy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          components: clippy
+          toolchain: stable
+      - uses: Swatinem/rust-cache@v2
+      - name: Annotate commit with clippy warnings
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features --workspace
+
+  build:
+    name: Build library
+    runs-on: ${{ matrix.os }}
+    needs:
+      - fmt
+      - clippy
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            artifact-name: linux
+
+          - os: [self-hosted, linux, arm64]
+            artifact-name: linux-arm64
+
+          - os: [self-hosted, macos, arm64]
+            artifact-name: macos-m1
+
+          - os: macos-latest
+            artifact-name: macos
+
+          - os: windows-2019
+            artifact-name: windows
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dtolnay/rust-toolchain@1.74.1
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: ${{ join( matrix.os, '-' ) }}
+
+      - name: Version suffix (for release only)
+        id: version
+        run: echo "suffix=${{ github.ref_type == 'tag' && '-' || ''}}${{ github.ref_type == 'tag' && github.ref || ''}}" >> $GITHUB_OUTPUT
+
+      - name: Install SQLite3 (Linux Arm64)
+        if: matrix.artifact-name == 'linux-arm64'
+        run: sudo apt-get install libsqlite3-dev
+
+      - name: Install SQLite3 (Windows)
+        if: matrix.artifact-name == 'windows'
+        run: |
+          choco install -y wget
+          cd C:\
+          mkdir lib
+          cd lib
+          wget https://github.com/buggins/ddbc/raw/master/libs/win64/sqlite3.lib
+          echo "LIB=C:\lib" >> $env:GITHUB_ENV
+
+      - name: Build
+        run: cargo build --release
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: quicksync-${{ matrix.artifact-name }}${{ steps.version.output.suffix }}
+          path: |
+            target/release/quicksync${{ matrix.os == 'windows-2019' && '.exe' || '' }}
+          if-no-files-found: error
+
+  release:
+    name: Publish release
+    if: github.event_name == 'push' && github.ref_type == 'tag'
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          path: ./artifacts
+      - name: List artifacts
+        run: ls -R ./artifacts
+      - name: Create a draft release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: true
+          prerelease: false
+      - name: Pack artifacts
+        run: >
+          mkdir ./assets;
+          for dir in ./artifacts/*/; do
+            zip -o -j -r "./assets/$(basename "$dir")-$TAG.zip" "$dir";
+          done
+        env:
+          TAG: ${{ github.ref_name }}
+      - name: Upload Release Assets
+        run: gh release upload $TAG ./assets/*.zip
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAG: ${{ github.ref_name }}
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
index c325b82..b05cf1b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,5 +3,1798 @@
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+checksum = "8a30b2e23b9e17a9f90641c7ab1549cd9b44f296d3ccbf309d2863cfe398a0cb"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
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+dependencies = [
+ "cfg-if",
+ "cipher",
+ "cpufeatures",
+]
+
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+name = "ahash"
+version = "0.8.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77c3a9648d43b9cd48db467b3f87fdd6e146bcc88ab0180006cef2179fe11d01"
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+ "cfg-if",
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+ "zerocopy",
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+
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+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a28637cb1fa3560a16915793afb20081aba2c92ee8af57b4d5f28e4b3e7df313"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffe5e8e31046ce6230cc7215707b816e339ff4d4d67c65dffa206fd0f7aa7b9a"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d6fa32db2bc4a2f5abeacf2b69f7992cd09dca97498da74a151a3132c26befd"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a657e1e9d3f514745a572a6846d3c7aa7dbe1658c056ed9c3344c4109a6949e"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
+
+[[package]]
+name = "winreg"
+version = "0.50.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "524e57b2c537c0f9b1e69f1965311ec12182b4122e45035b1508cd24d2adadb1"
+dependencies = [
+ "cfg-if",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "zerocopy"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74d4d3961e53fa4c9a25a8637fc2bfaf2595b3d3ae34875568a5cf64787716be"
+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
+version = "0.7.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ce1b18ccd8e73a9321186f97e46f9f04b778851177567b1975109d26a08d2a6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "zip"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "760394e246e4c28189f19d488c058bf16f564016aefac5d32bb1f3b51d5e9261"
+dependencies = [
+ "aes",
+ "byteorder",
+ "bzip2",
+ "constant_time_eq",
+ "crc32fast",
+ "crossbeam-utils",
+ "flate2",
+ "hmac",
+ "pbkdf2",
+ "sha1",
+ "time",
+ "zstd",
+]
+
+[[package]]
+name = "zstd"
+version = "0.11.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "20cc960326ece64f010d2d2107537f26dc589a6573a316bd5b1dba685fa5fde4"
+dependencies = [
+ "zstd-safe",
+]
+
+[[package]]
+name = "zstd-safe"
+version = "5.0.2+zstd.1.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d2a5585e04f9eea4b2a3d1eca508c4dee9592a89ef6f450c11719da0726f4db"
+dependencies = [
+ "libc",
+ "zstd-sys",
+]
+
+[[package]]
+name = "zstd-sys"
+version = "2.0.9+zstd.1.5.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9e16efa8a874a0481a574084d34cc26fdb3b99627480f785888deb6386506656"
+dependencies = [
+ "cc",
+ "pkg-config",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 4268b5b..babebd0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,18 @@
 [package]
-name = "quicksync-rs"
-version = "0.0.0"
+name = "quicksync"
+version = "0.1.6"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.79"
+chrono = "0.4.31"
+clap = { version="4.4.14", features=["derive"] }
+duration-string = "0.3.0"
+md5 = "0.7.0"
+regex = "1.10.3"
+reqwest = { version = "0.11.23", features = ["json", "stream", "blocking"] }
+rusqlite = { version = "0.30.0", features = ["bundled"] }
+url = "2.5.0"
+zip = "0.6.6"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..8368494
--- /dev/null
+++ b/README.md
@@ -0,0 +1,20 @@
+# Quicksync-rs
+
+How to use:
+```
+quicksync-rs help
+```
+
+Development:
+```
+cargo run -- help
+```
+
+## Exit codes
+- `0` - all good
+- `1` - failed to download archive within max retries (any reason)
+- `2` - cannot unpack archive: not enough disk space
+- `3` - cannot unpack archive: any other reason
+- `4` - invalid checksum
+- `5` - cannot verify checksum for some reason
+- `6` - cannot create a backup file
\ No newline at end of file
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..47874a2
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+tab_spaces=2
\ No newline at end of file
diff --git a/src/README.md b/src/README.md
deleted file mode 100644
index e69de29..0000000
diff --git a/src/checksum.rs b/src/checksum.rs
new file mode 100644
index 0000000..d603db9
--- /dev/null
+++ b/src/checksum.rs
@@ -0,0 +1,68 @@
+use anyhow::Result;
+use reqwest::blocking::{Client, Response};
+use std::{
+  fs::File,
+  io::{BufRead, BufReader},
+  path::Path,
+};
+use url::Url;
+
+use crate::utils::strip_trailing_newline;
+
+fn replace_sql_zip_with_md5(url: &Url) -> Result<Url> {
+  let url_str = url.as_str();
+  if url_str.ends_with(".sql.zip") {
+    let new_url_str = url_str.replace(".sql.zip", ".sql.md5");
+    Ok(Url::parse(&new_url_str)?)
+  } else {
+    anyhow::bail!("URL does not end with .sql.zip")
+  }
+}
+
+pub fn download_checksum(url: &Url) -> Result<String> {
+  let md5_url = replace_sql_zip_with_md5(&url)?;
+
+  let client = Client::new();
+  let response: Response = client.get(md5_url).send()?;
+
+  if response.status().is_success() {
+    let md5 = response.text()?;
+    let stripped = strip_trailing_newline(&md5);
+    Ok(stripped.to_string())
+  } else {
+    anyhow::bail!(
+      "Cannot download MD5 checksum: status code is {:?}",
+      response.status()
+    );
+  }
+}
+
+pub fn calculate_checksum(file_path: &Path) -> Result<String> {
+  let file = File::open(file_path)?;
+  let mut reader = BufReader::with_capacity(16 * 1024 * 1024, file);
+  let mut hasher = md5::Context::new();
+
+  loop {
+    let chunk = reader.fill_buf()?;
+    if chunk.is_empty() {
+      break;
+    }
+    hasher.consume(chunk);
+    let chunk_len = chunk.len();
+    reader.consume(chunk_len);
+  }
+
+  let hash = hasher.compute();
+  Ok(format!("{:x}", hash))
+}
+
+pub fn verify(redirect_file_path: &Path, unpacked_file_path: &Path) -> Result<bool> {
+  let archive_url_str = String::from_utf8(std::fs::read(redirect_file_path)?)?;
+
+  let archive_url = Url::parse(&archive_url_str)?;
+
+  let md5_expected = download_checksum(&archive_url)?;
+  let md5_actual = calculate_checksum(unpacked_file_path)?;
+
+  Ok(md5_actual == md5_expected)
+}
diff --git a/src/download.rs b/src/download.rs
new file mode 100644
index 0000000..8d45e3f
--- /dev/null
+++ b/src/download.rs
@@ -0,0 +1,132 @@
+use anyhow::{anyhow, Result};
+use reqwest::blocking::Client;
+use std::collections::VecDeque;
+use std::fs::{self, OpenOptions};
+use std::io::{Read, Seek, SeekFrom, Write};
+use std::path::Path;
+use std::time::Instant;
+
+pub fn download_file(url: &str, file_path: &Path, redirect_path: &Path) -> Result<()> {
+  if let Some(dir) = file_path.parent() {
+    fs::create_dir_all(dir)?;
+  }
+
+  let mut file = OpenOptions::new()
+    .create(true)
+    .read(true)
+    .write(true)
+    .open(file_path)?;
+
+  let file_size = file.metadata()?.len();
+
+  let client = Client::builder()
+    .timeout(std::time::Duration::from_secs(30))
+    .build()?;
+  let mut response = client
+    .get(url)
+    .header("Range", format!("bytes={}-", file_size))
+    .send()?;
+
+  let final_url = response.url().clone();
+
+  fs::write(redirect_path, final_url.as_str())?;
+
+  if !response.status().is_success() {
+    fs::remove_file(redirect_path)?;
+    fs::remove_file(file_path)?;
+
+    anyhow::bail!(
+      "Failed to download: Response status code is {:?}",
+      response.status()
+    );
+  }
+
+  let total_size = response
+    .headers()
+    .get(reqwest::header::CONTENT_LENGTH)
+    .and_then(|ct_len| ct_len.to_str().ok())
+    .and_then(|ct_len| ct_len.parse::<u64>().ok())
+    .unwrap_or(0)
+    + file_size;
+
+  file.seek(SeekFrom::End(0))?;
+  let mut downloaded: u64 = file_size;
+  let mut last_reported_progress: i64 = -1;
+  let start = Instant::now();
+  let mut measurements = VecDeque::with_capacity(10);
+
+  let mut buffer = [0; 16 * 1024];
+  loop {
+    match response.read(&mut buffer) {
+      Ok(0) => {
+        break;
+      }
+      Ok(bytes_read) => {
+        file.write_all(&buffer[..bytes_read])?;
+        downloaded += bytes_read as u64;
+
+        let elapsed = start.elapsed().as_secs_f64();
+        let speed = if elapsed > 0.0 {
+          downloaded as f64 / elapsed
+        } else {
+          0.0
+        };
+        measurements.push_back(speed);
+        if measurements.len() > 10 {
+          measurements.pop_front();
+        }
+        let avg_speed = measurements.iter().sum::<f64>() / measurements.len() as f64;
+        let eta = if avg_speed > 0.0 {
+          (total_size as f64 - downloaded as f64) / avg_speed
+        } else {
+          0.0
+        };
+
+        let progress = (downloaded as f64 / total_size as f64 * 100.0).round() as i64;
+        if progress > last_reported_progress {
+          println!(
+            "Downloading... {:.2}% ({:.2} MB/{:.2} MB) ETA: {:.0} sec",
+            progress,
+            downloaded as f64 / 1_024_000.00,
+            total_size as f64 / 1_024_000.00,
+            eta
+          );
+          last_reported_progress = progress;
+        }
+      }
+      Err(e) => {
+        return Err(anyhow!(e));
+      }
+    }
+  }
+
+  println!("Download finished");
+
+  Ok(())
+}
+
+pub fn download_with_retries(
+  url: &str,
+  file_path: &Path,
+  redirect_path: &Path,
+  max_retries: u32,
+) -> Result<()> {
+  let mut attempts = 0;
+
+  loop {
+    match download_file(url, file_path, redirect_path) {
+      Ok(()) => return Ok(()),
+      Err(e) if attempts < max_retries => {
+        println!(
+          "Download error: {}. Attempt {} / {}",
+          e,
+          attempts + 1,
+          max_retries
+        );
+        attempts += 1;
+        std::thread::sleep(std::time::Duration::from_secs(5));
+      }
+      Err(e) => return Err(anyhow!(e)),
+    }
+  }
+}
diff --git a/src/go_spacemesh.rs b/src/go_spacemesh.rs
new file mode 100644
index 0000000..f2bc38f
--- /dev/null
+++ b/src/go_spacemesh.rs
@@ -0,0 +1,13 @@
+use anyhow::Result;
+use std::process::Command;
+
+use crate::utils::trim_version;
+
+pub fn get_version(path: &str) -> Result<String> {
+  let output = Command::new(path).arg("version").output()?;
+
+  let version = String::from_utf8(output.stdout)?;
+  let trimmed = trim_version(version.trim()).to_string();
+
+  Ok(trimmed)
+}
diff --git a/src/main.rs b/src/main.rs
index a8c8771..bb34c10 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,252 @@
-use std::error::Error;
+use chrono::Duration;
+use clap::{Parser, Subcommand};
+use std::path::PathBuf;
+use std::process;
+use url::Url;
 
-fn main() {
-    println!("Hello world");
+mod checksum;
+mod download;
+mod go_spacemesh;
+mod parsers;
+mod reader_with_progress;
+mod sql;
+mod utils;
+mod zip;
+
+use checksum::*;
+use download::download_with_retries;
+use go_spacemesh::get_version;
+use parsers::*;
+use sql::get_last_layer_from_db;
+use utils::*;
+use zip::unpack;
+
+#[derive(Parser, Debug)]
+#[clap(author, version, about, long_about = None)]
+struct Cli {
+  #[clap(subcommand)]
+  command: Commands,
+}
+
+const DEFAULT_DOWNLOAD_URL: &str = "https://quicksync.spacemesh.network/";
+
+#[derive(Subcommand, Debug)]
+enum Commands {
+  /// Checks if quicksync is recommended
+  Check {
+    /// Path to the node-data directory
+    #[clap(short = 'd', long)]
+    node_data: PathBuf,
+    /// Genesis time in ISO format
+    #[clap(short = 't', long, default_value = "2023-07-14T08:00:00Z")]
+    genesis_time: chrono::DateTime<chrono::Utc>,
+    /// Layer duration
+    #[clap(short = 'l', long, default_value = "5m", value_parser = parse_duration)]
+    layer_duration: Duration,
+    /// Path to go-spacemesh binary
+    #[clap(short = 'g', long, default_value = go_spacemesh_default_path())]
+    go_spacemesh_path: PathBuf,
+    /// URL to download database from. Node version will be appended at the end
+    #[clap(
+      short = 'u',
+      long,
+      default_value = DEFAULT_DOWNLOAD_URL
+    )]
+    download_url: Url,
+  },
+  /// Downloads latest db from official website
+  Download {
+    /// Path to the node-data directory
+    #[clap(short = 'd', long)]
+    node_data: PathBuf,
+    /// Path to go-spacemesh binary
+    #[clap(short = 'g', long, default_value = go_spacemesh_default_path())]
+    go_spacemesh_path: PathBuf,
+    /// URL to download database from. Node version will be appended at the end
+    #[clap(
+      short = 'u',
+      long,
+      default_value = DEFAULT_DOWNLOAD_URL
+    )]
+    download_url: Url,
+    /// Maximum retries amount for downloading (or resuming download) if something went wrong
+    #[clap(short = 'r', long, default_value = "10")]
+    max_retries: u32,
+  },
+}
+
+fn go_spacemesh_default_path() -> &'static str {
+  #[cfg(target_os = "windows")]
+  {
+    "./go-spacemesh.exe"
+  }
+  #[cfg(not(target_os = "windows"))]
+  {
+    "./go-spacemesh"
+  }
+}
+
+fn backup_or_fail(file_path: &PathBuf) -> () {
+  if file_path.exists() {
+    println!(
+      "Backing up file: {}",
+      file_path.file_name().unwrap().to_str().unwrap()
+    );
+    match backup_file(&file_path) {
+      Ok(b) => {
+        let backup_name = b.to_str().expect("Cannot get a path of backed up file");
+        println!("File backed up to: {}", backup_name);
+      }
+      Err(e) => {
+        eprintln!("Cannot create a backup file: {}", e);
+        process::exit(6);
+      }
+    }
+  }
+}
+
+fn main() -> anyhow::Result<()> {
+  let cli = Cli::parse();
+
+  match cli.command {
+    Commands::Check {
+      node_data,
+      genesis_time,
+      layer_duration,
+      go_spacemesh_path,
+      download_url,
+    } => {
+      let result = {
+        let dir_path = node_data.clone();
+        let db_file_path = dir_path.join("state.sql");
+        let db_file_str = db_file_path.to_str().expect("Cannot compose path");
+        println!("Checking database: {}", db_file_str);
+        let db_layer = if db_file_path.exists() {
+          i64::from(get_last_layer_from_db(&db_file_path).or_else(|err| {
+            eprintln!("{}", err);
+            println!("Cannot read database, trating it as empty database");
+            return Ok::<i32, anyhow::Error>(0);
+          })?)
+        } else {
+          println!("Database file is not found");
+          0
+        };
+        println!("Latest layer in db: {}", db_layer);
+
+        let time_layer = calculate_latest_layer(genesis_time, layer_duration)?;
+        println!("Current network layer: {}", time_layer);
+
+        let go_path = resolve_path(&go_spacemesh_path).unwrap();
+        let go_path_str = go_path
+          .to_str()
+          .expect("Cannot resolve path to go-spacemesh");
+        let go_version = get_version(&go_path_str)?;
+        let quicksync_layer = fetch_latest_available_layer(&download_url, &go_version)?;
+        println!("Latest layer in cloud: {}", quicksync_layer);
+        Ok(())
+      };
+      if result.is_err() {
+        process::exit(1);
+      }
+      result
+    }
+    Commands::Download {
+      node_data,
+      go_spacemesh_path,
+      download_url,
+      max_retries,
+    } => {
+      let dir_path = node_data;
+      let temp_file_path = dir_path.join("state.download");
+      let redirect_file_path = dir_path.join("state.url");
+      let archive_file_path = dir_path.join("state.zip");
+      let unpacked_file_path = dir_path.join("state_downloaded.sql");
+      let final_file_path = dir_path.join("state.sql");
+      let wal_file_path = dir_path.join("state.sql-wal");
+
+      // Download archive if needed
+      if !archive_file_path.exists() {
+        println!("Downloading the latest database...");
+        let url = if redirect_file_path.exists() {
+          std::fs::read_to_string(&redirect_file_path)?
+        } else {
+          let go_path = resolve_path(&go_spacemesh_path).unwrap();
+          let go_path_str = go_path
+            .to_str()
+            .expect("Cannot resolve path to go-spacemesh");
+          let path = format!("{}/state.zip", &get_version(go_path_str)?);
+          let url = build_url(&download_url, &path);
+          url.to_string()
+        };
+
+        if let Err(e) =
+          download_with_retries(&url, &temp_file_path, &redirect_file_path, max_retries)
+        {
+          eprintln!(
+            "Failed to download a file after {} attempts: {}",
+            max_retries, e
+          );
+          process::exit(1);
+        }
+
+        // Rename `state.download` -> `state.zip`
+        std::fs::rename(&temp_file_path, &archive_file_path)?;
+        println!("Archive downloaded!");
+      }
+
+      // Unzip
+      match unpack(&archive_file_path, &unpacked_file_path) {
+        Ok(_) => {
+          println!("Archive unpacked successfully");
+        }
+        Err(e) => {
+          if let Some(io_err) = e.downcast_ref::<std::io::Error>() {
+            if io_err.raw_os_error() == Some(28) {
+              eprintln!("Cannot unpack archive: not enough disk space");
+              std::fs::remove_file(&unpacked_file_path)?;
+              process::exit(2);
+            }
+          }
+          eprintln!("Cannot unpack archive: {}", e);
+          std::fs::remove_file(&unpacked_file_path)?;
+          std::fs::remove_file(&archive_file_path)?;
+          std::fs::remove_file(&redirect_file_path)?;
+          process::exit(3);
+        }
+      }
+
+      // Verify checksum
+      println!("Verifying MD5 checksum...");
+      match verify(&redirect_file_path, &unpacked_file_path) {
+        Ok(true) => {
+          println!("Checksum is valid");
+        }
+        Ok(false) => {
+          eprintln!("MD5 checksums are not equal. Deleting archive and unpacked state.sql");
+          std::fs::remove_file(&unpacked_file_path)?;
+          std::fs::remove_file(&archive_file_path)?;
+          std::fs::remove_file(&redirect_file_path)?;
+          process::exit(4);
+        }
+        Err(e) => {
+          eprintln!("Cannot verify checksum: {}", e);
+          process::exit(5);
+        }
+      }
+
+      backup_or_fail(&final_file_path);
+      backup_or_fail(&wal_file_path);
+
+      std::fs::rename(&unpacked_file_path, &final_file_path)
+        .expect("Cannot rename downloaded file into state.sql");
+
+      std::fs::remove_file(&redirect_file_path)?;
+      std::fs::remove_file(&archive_file_path)?;
+
+      println!("Done!");
+      println!("Now you can run go-spacemesh as usually.");
+
+      Ok(())
+    }
+  }
 }
diff --git a/src/parsers.rs b/src/parsers.rs
new file mode 100644
index 0000000..c35c1d0
--- /dev/null
+++ b/src/parsers.rs
@@ -0,0 +1,11 @@
+use std::io::{Error, ErrorKind};
+
+pub fn parse_duration(v: &str) -> Result<chrono::Duration, Error> {
+  let ds = v
+    .parse::<duration_string::DurationString>()
+    .map_err(|e| Error::new(ErrorKind::InvalidInput, e.to_string()))?;
+  let res = chrono::Duration::from_std(ds.into())
+    .map_err(|e| Error::new(ErrorKind::InvalidInput, e.to_string()))?;
+
+  Ok(res)
+}
diff --git a/src/reader_with_progress.rs b/src/reader_with_progress.rs
new file mode 100644
index 0000000..765cb2e
--- /dev/null
+++ b/src/reader_with_progress.rs
@@ -0,0 +1,34 @@
+use std::io::Read;
+
+pub struct ReaderWithProgress<R: Read> {
+  reader: R,
+  total: u64,
+  extracted: u64,
+  last_reported_progress: u64,
+}
+
+impl<R: Read> ReaderWithProgress<R> {
+  pub fn new(reader: R, total_size: u64) -> ReaderWithProgress<R> {
+    ReaderWithProgress {
+      reader,
+      total: total_size,
+      extracted: 0,
+      last_reported_progress: 0,
+    }
+  }
+}
+
+impl<R: Read> Read for ReaderWithProgress<R> {
+  fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+    let bytes_read = self.reader.read(buf)?;
+    self.extracted += bytes_read as u64;
+
+    let progress = (self.extracted as f64 / self.total as f64 * 100.0).round() as u64;
+    if self.last_reported_progress != progress {
+      self.last_reported_progress = progress;
+      println!("Unzipping... {}%", progress);
+    }
+
+    Ok(bytes_read)
+  }
+}
diff --git a/src/sql.rs b/src/sql.rs
new file mode 100644
index 0000000..2072889
--- /dev/null
+++ b/src/sql.rs
@@ -0,0 +1,17 @@
+use anyhow::{Context, Result};
+use rusqlite::{params, Connection};
+use std::path::PathBuf;
+
+pub fn get_last_layer_from_db(db_path: &PathBuf) -> Result<i32> {
+  let conn = Connection::open(db_path).context("Failed to connect to db")?;
+
+  let mut stmt = conn.prepare("SELECT * FROM layers ORDER BY id DESC LIMIT 1")?;
+  let mut layer_iter = stmt.query_map(params![], |row| row.get::<_, i32>(0))?;
+
+  if let Some(result) = layer_iter.next() {
+    let last_id = result?;
+    Ok(last_id)
+  } else {
+    Ok(0)
+  }
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..c00969f
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,106 @@
+use anyhow::{anyhow, Result};
+use chrono::{DateTime, Duration, Utc};
+use regex::Regex;
+use reqwest::blocking::Client;
+use std::{env, path::PathBuf};
+use url::Url;
+
+pub fn strip_trailing_newline(input: &str) -> &str {
+  input.trim_end()
+}
+
+pub fn calculate_latest_layer(
+  genesis_time: DateTime<Utc>,
+  layer_duration: Duration,
+) -> Result<i64> {
+  let delta = Utc::now() - genesis_time;
+  Ok(delta.num_milliseconds() / layer_duration.num_milliseconds())
+}
+
+pub fn resolve_path(relative_path: &PathBuf) -> Result<PathBuf> {
+  let current_dir = env::current_dir()?;
+  let resolved_path = current_dir.join(relative_path);
+  Ok(resolved_path)
+}
+
+pub fn trim_version(version: &str) -> &str {
+  version.split('+').next().unwrap_or(version)
+}
+
+pub fn build_url(base: &Url, path: &str) -> Url {
+  let mut url = base.clone();
+  url
+    .path_segments_mut()
+    .expect("cannot be base")
+    .extend(path.split('/'));
+  url
+}
+
+pub fn backup_file(original_path: &PathBuf) -> Result<PathBuf> {
+  if !original_path.exists() {
+    anyhow::bail!("No file to make a backup");
+  }
+
+  let mut backup_path = original_path.with_extension("sql.bak");
+  let mut counter = 1;
+
+  while backup_path.exists() {
+    let new_name = format!("state.sql.bak.{}", counter);
+    backup_path = original_path.with_file_name(new_name);
+    counter += 1;
+  }
+
+  std::fs::rename(original_path, &backup_path)?;
+
+  Ok(backup_path)
+}
+
+fn extract_number_from_url(url: &Url) -> Result<u64> {
+  let re = Regex::new(r"/(\d+)\.sql\.zip$")?;
+  let path = url.path();
+  let caps = re
+    .captures(path)
+    .ok_or_else(|| anyhow!("No numeric value found in URL: {}", url))?;
+
+  let number_str = caps
+    .get(1)
+    .ok_or_else(|| anyhow!("No numeric value captured"))?
+    .as_str();
+  let number = number_str.parse::<u64>()?;
+
+  Ok(number)
+}
+
+pub fn fetch_latest_available_layer(download_url: &Url, go_version: &str) -> Result<u64> {
+  let client = Client::builder()
+    .timeout(std::time::Duration::from_secs(30))
+    .build()?;
+
+  let path = format!("{}/state.zip", go_version);
+  let url = build_url(&download_url, &path);
+
+  let response = client.head(url).send()?;
+
+  let final_url = response.url();
+  let num = extract_number_from_url(final_url)?;
+
+  Ok(num)
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use url::Url;
+
+  #[test]
+  fn test_extract_number_valid() {
+    let url = Url::parse("https://quicksync-downloads.spacemesh.network/10/61579.sql.zip").unwrap();
+    assert_eq!(extract_number_from_url(&url).unwrap(), 61579);
+  }
+
+  #[test]
+  fn test_extract_number_invalid() {
+    let url = Url::parse("https://quicksync.spacemesh.network/state.zip").unwrap();
+    assert!(extract_number_from_url(&url).is_err());
+  }
+}
diff --git a/src/zip.rs b/src/zip.rs
new file mode 100644
index 0000000..18462f4
--- /dev/null
+++ b/src/zip.rs
@@ -0,0 +1,52 @@
+use anyhow::Result;
+use std::fs::File;
+use std::io::{BufReader, Error};
+use std::path::Path;
+use zip::read::ZipFile;
+use zip::ZipArchive;
+
+use crate::reader_with_progress::ReaderWithProgress;
+
+fn find_file_in_archive<'a>(
+  archive: &'a mut ZipArchive<File>,
+  file_name: &str,
+) -> Result<ZipFile<'a>, Error> {
+  let mut found_idx = None;
+  for i in 0..archive.len() {
+    let file = archive.by_index(i)?;
+    if file.name().ends_with(file_name) {
+      found_idx = Some(i);
+      break;
+    }
+  }
+  if let Some(idx) = found_idx {
+    return Ok(archive.by_index(idx)?);
+  }
+
+  Err(Error::new(
+    std::io::ErrorKind::NotFound,
+    format!("File '{}' not found in archive", file_name),
+  ))
+}
+
+pub fn unpack(archive_path: &Path, output_path: &Path) -> Result<()> {
+  let file = File::open(archive_path)?;
+  let mut zip = ZipArchive::new(file)?;
+
+  let state_sql: ZipFile = find_file_in_archive(&mut zip, "state.sql")?;
+  let outpath = Path::new(output_path);
+
+  if let Some(p) = outpath.parent() {
+    std::fs::create_dir_all(p)?;
+  }
+  let mut outfile = File::create(outpath)?;
+
+  let total_size = state_sql.size();
+  let mut reader =
+    ReaderWithProgress::new(BufReader::with_capacity(1024 * 1024, state_sql), total_size);
+
+  std::io::copy(&mut reader, &mut outfile)?;
+  println!("Unzipping... 100%");
+
+  Ok(())
+}