diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9f339a8
--- /dev/null
+++ b/README.md
@@ -0,0 +1,31 @@
+## Moscow blockchain hackathon tutorial
+
+### Installation
+
+To compile and run these example you need to install  
+ - rust with wasm32-wasi target 
+```bash
+curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
+rustup install nightly
+rustup target add wasm32-wasi
+```
+- Marine tools
+```bash
+cargo install marine
+cargo +nightly install mrepl
+```
+- Fluence deploying tools
+```bash
+npm -g install @fluencelabs/fldist
+```
+
+### Building
+
+To build all the examples just run the following command
+```bash
+./build.sh
+```
+
+### Deploying and calling from Aqua
+
+TBD
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..4ac71d6
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+
+(
+  cd hello_world || exit;
+  ./build.sh
+)
+
+(
+  cd url-downloader || exit;
+  ./build.sh
+)
+
+(
+  cd ipfs-node || exit;
+  ./build.sh
+)
diff --git a/hello_world/Cargo.lock b/hello-world/Cargo.lock
similarity index 100%
rename from hello_world/Cargo.lock
rename to hello-world/Cargo.lock
diff --git a/hello_world/Cargo.toml b/hello-world/Cargo.toml
similarity index 100%
rename from hello_world/Cargo.toml
rename to hello-world/Cargo.toml
diff --git a/hello_world/Config.toml b/hello-world/Config.toml
similarity index 100%
rename from hello_world/Config.toml
rename to hello-world/Config.toml
diff --git a/hello_world/artifacts/greeting.wasm b/hello-world/artifacts/greeting.wasm
similarity index 99%
rename from hello_world/artifacts/greeting.wasm
rename to hello-world/artifacts/greeting.wasm
index e5703c5..843ed21 100755
Binary files a/hello_world/artifacts/greeting.wasm and b/hello-world/artifacts/greeting.wasm differ
diff --git a/hello_world/build.sh b/hello-world/build.sh
similarity index 100%
rename from hello_world/build.sh
rename to hello-world/build.sh
diff --git a/hello_world/src/main.rs b/hello-world/src/main.rs
similarity index 100%
rename from hello_world/src/main.rs
rename to hello-world/src/main.rs
diff --git a/ipfs-node/Config.toml b/ipfs-node/Config.toml
new file mode 100644
index 0000000..318157a
--- /dev/null
+++ b/ipfs-node/Config.toml
@@ -0,0 +1,17 @@
+modules_dir = "artifacts/"
+
+[[module]]
+    name = "ipfs_effector"
+    max_heap_size = "10 KiB"
+    logger_enabled = true
+
+    [module.mounted_binaries]
+    ipfs = "/usr/local/bin/ipfs"
+
+    [module.wasi]
+    envs = { "IPFS_ADDR" = "/dns4/relay02.fluence.dev/tcp/15001", "timeout" = "1s" }
+
+[[module]]
+    name = "ipfs_pure"
+    max_heap_size = "10 KiB"
+    logger_enabled = true
diff --git a/ipfs-node/artifacts/ipfs_effector.wasm b/ipfs-node/artifacts/ipfs_effector.wasm
new file mode 100755
index 0000000..a46d4bb
Binary files /dev/null and b/ipfs-node/artifacts/ipfs_effector.wasm differ
diff --git a/ipfs-node/artifacts/ipfs_pure.wasm b/ipfs-node/artifacts/ipfs_pure.wasm
new file mode 100755
index 0000000..8046d13
Binary files /dev/null and b/ipfs-node/artifacts/ipfs_pure.wasm differ
diff --git a/ipfs-node/build.sh b/ipfs-node/build.sh
new file mode 100755
index 0000000..5bb1a73
--- /dev/null
+++ b/ipfs-node/build.sh
@@ -0,0 +1,19 @@
+#!/bin/sh
+
+(
+  cd effector || exit;
+  cargo update --aggressive;
+  marine build --release;
+)
+
+(
+  cd pure || exit;
+  cargo update --aggressive;
+  marine build --release;
+)
+
+rm artifacts/* || true
+mkdir -p artifacts
+
+cp ./effector/target/wasm32-wasi/release/ipfs_effector.wasm artifacts/
+cp ./pure/target/wasm32-wasi/release/ipfs_pure.wasm artifacts/
diff --git a/ipfs-node/effector/Cargo.lock b/ipfs-node/effector/Cargo.lock
new file mode 100644
index 0000000..b7d7150
--- /dev/null
+++ b/ipfs-node/effector/Cargo.lock
@@ -0,0 +1,275 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
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+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
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+ "num-integer",
+ "num-traits",
+ "time",
+ "winapi",
+]
+
+[[package]]
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "ipfs-effector"
+version = "0.1.0"
+dependencies = [
+ "log",
+ "marine-rs-sdk",
+]
+
+[[package]]
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+
+[[package]]
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+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "marine-macro"
+version = "0.6.15"
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+
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+dependencies = [
+ "proc-macro2",
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+ "serde",
+ "serde_json",
+ "syn",
+ "uuid",
+]
+
+[[package]]
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+ "marine-macro",
+ "marine-rs-sdk-main",
+ "marine-timestamp-macro",
+ "polyplets",
+ "serde",
+]
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+[[package]]
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+dependencies = [
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+
+[[package]]
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+
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+ "itoa",
+ "ryu",
+ "serde",
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
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+
+[[package]]
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diff --git a/ipfs-node/effector/Cargo.toml b/ipfs-node/effector/Cargo.toml
new file mode 100644
index 0000000..6c53f93
--- /dev/null
+++ b/ipfs-node/effector/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "ipfs-effector"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+publish = false
+
+[[bin]]
+name = "ipfs_effector"
+path = "src/main.rs"
+
+[dependencies]
+marine-rs-sdk ={ version = "0.6.13", features = ["logger"] }
+log = "0.4.14"
diff --git a/ipfs-node/effector/src/main.rs b/ipfs-node/effector/src/main.rs
new file mode 100644
index 0000000..5cb314d
--- /dev/null
+++ b/ipfs-node/effector/src/main.rs
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#![allow(improper_ctypes)]
+
+mod path;
+
+use crate::path::to_full_path;
+
+use marine_rs_sdk::marine;
+use marine_rs_sdk::module_manifest;
+use marine_rs_sdk::WasmLoggerBuilder;
+use marine_rs_sdk::MountedBinaryResult;
+
+const RESULT_FILE_PATH: &str = "/tmp/ipfs_rpc_file";
+const IPFS_ADDR_ENV_NAME: &str = "IPFS_ADDR";
+const TIMEOUT_ENV_NAME: &str = "timeout";
+
+module_manifest!();
+
+pub fn main() {
+    WasmLoggerBuilder::new()
+        .with_log_level(log::LevelFilter::Info)
+        .build()
+        .unwrap();
+}
+
+/// Put file from specified path to IPFS and return its hash.
+#[marine]
+pub fn put(file_path: String) -> String {
+    log::info!("put called with file path {}", file_path);
+
+    let file_path = to_full_path(file_path);
+
+    let timeout = std::env::var(TIMEOUT_ENV_NAME).unwrap_or_else(|_| "1s".to_string());
+    let cmd = vec![
+        String::from("add"),
+        String::from("--timeout"),
+        timeout,
+        String::from("-Q"),
+        file_path,
+    ];
+
+    let ipfs_result = ipfs(cmd);
+    ipfs_result
+        .into_std()
+        .unwrap()
+        .unwrap_or_else(std::convert::identity)
+}
+
+/// Get file by provided hash from IPFS, saves it to a temporary file and returns a path to it.
+#[marine]
+pub fn get(hash: String) -> String {
+    log::info!("get called with hash {}", hash);
+
+    let result_file_path = to_full_path(RESULT_FILE_PATH);
+
+    let timeout = std::env::var(TIMEOUT_ENV_NAME).unwrap_or_else(|_| "1s".to_string());
+    let cmd = vec![
+        String::from("get"),
+        String::from("--timeout"),
+        timeout,
+        String::from("-o"),
+        result_file_path,
+        hash,
+    ];
+
+    ipfs(cmd);
+    RESULT_FILE_PATH.to_string()
+}
+
+#[marine]
+pub fn get_address() -> String {
+    match std::env::var(IPFS_ADDR_ENV_NAME) {
+        Ok(addr) => addr,
+        Err(e) => format!(
+            "getting {} env variable failed with error {:?}",
+            IPFS_ADDR_ENV_NAME, e
+        ),
+    }
+}
+
+#[marine]
+#[link(wasm_import_module = "host")]
+extern "C" {
+    /// Execute provided cmd as a parameters of ipfs cli, return result.
+    pub fn ipfs(cmd: Vec<String>) -> MountedBinaryResult;
+}
diff --git a/ipfs-node/effector/src/path.rs b/ipfs-node/effector/src/path.rs
new file mode 100644
index 0000000..4f7d0d5
--- /dev/null
+++ b/ipfs-node/effector/src/path.rs
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+pub(super) fn to_full_path<S>(cmd: S) -> String
+where
+    S: Into<String>,
+{
+    use std::path::Path;
+    use std::path::Component;
+
+    let cmd = cmd.into();
+    let path = Path::new(&cmd);
+
+    let mut components = path.components();
+    let is_absolute = components.next() == Some(Component::RootDir);
+
+    if !is_absolute {
+        return cmd;
+    }
+
+    let parent = match components.next() {
+        Some(Component::Normal(path)) => path.to_str().unwrap(),
+        _ => return cmd,
+    };
+
+    match std::env::var(parent) {
+        Ok(to_dir) => {
+            let mut full_path = std::path::PathBuf::from(to_dir);
+
+            // TODO: optimize this
+            #[allow(clippy::while_let_on_iterator)]
+            while let Some(component) = components.next() {
+                full_path.push(component);
+            }
+            full_path.to_string_lossy().into_owned()
+        }
+        Err(_) => cmd,
+    }
+}
diff --git a/ipfs-node/pure/Cargo.lock b/ipfs-node/pure/Cargo.lock
new file mode 100644
index 0000000..7e0bc3b
--- /dev/null
+++ b/ipfs-node/pure/Cargo.lock
@@ -0,0 +1,275 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
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+
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+
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+dependencies = [
+ "libc",
+ "num-integer",
+ "num-traits",
+ "time",
+ "winapi",
+]
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+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "ipfs-pure"
+version = "0.1.0"
+dependencies = [
+ "log",
+ "marine-rs-sdk",
+]
+
+[[package]]
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+version = "1.0.1"
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+
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diff --git a/ipfs-node/pure/Cargo.toml b/ipfs-node/pure/Cargo.toml
new file mode 100644
index 0000000..11db390
--- /dev/null
+++ b/ipfs-node/pure/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "ipfs-pure"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+edition = "2018"
+publish = false
+
+[[bin]]
+name = "ipfs_pure"
+path = "src/main.rs"
+
+[dependencies]
+marine-rs-sdk ={ version = "0.6.13", features = ["logger"] }
+log = "0.4.14"
diff --git a/ipfs-node/pure/src/main.rs b/ipfs-node/pure/src/main.rs
new file mode 100644
index 0000000..7a28624
--- /dev/null
+++ b/ipfs-node/pure/src/main.rs
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#![allow(improper_ctypes)]
+
+use marine_rs_sdk::marine;
+use marine_rs_sdk::module_manifest;
+use marine_rs_sdk::WasmLoggerBuilder;
+
+use std::fs;
+use std::path::PathBuf;
+
+const RPC_TMP_FILEPATH: &str = "/tmp/ipfs_rpc_file";
+
+module_manifest!();
+
+pub fn main() {
+    WasmLoggerBuilder::new()
+        .with_log_level(log::LevelFilter::Info)
+        .build()
+        .unwrap();
+}
+
+#[marine]
+pub fn invoke() -> String {
+    "IPFS_RPC wasm example, it allows to:\ninvoke\nput\nget".to_string()
+}
+
+#[marine]
+pub fn put(file_content: Vec<u8>) -> String {
+    log::info!("put called with {:?}", file_content);
+
+    let rpc_tmp_filepath = RPC_TMP_FILEPATH.to_string();
+
+    let r = fs::write(PathBuf::from(rpc_tmp_filepath.clone()), file_content);
+    if let Err(e) = r {
+        return format!("file can't be written: {}", e);
+    }
+
+    ipfs_put(rpc_tmp_filepath)
+}
+
+#[marine]
+pub fn get(hash: String) -> Vec<u8> {
+    log::info!("get called with hash: {}", hash);
+
+    let file_path = ipfs_get(hash);
+    fs::read(file_path).unwrap_or_else(|_| b"error while reading file".to_vec())
+}
+
+#[marine]
+#[link(wasm_import_module = "ipfs_effector")]
+extern "C" {
+    /// Put provided file to ipfs, return ipfs hash of the file.
+    #[link_name = "put"]
+    pub fn ipfs_put(file_path: String) -> String;
+
+    /// Get file from ipfs by hash.
+    #[link_name = "get"]
+    pub fn ipfs_get(hash: String) -> String;
+}