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* update README
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* Apply suggestions from code review

Co-authored-by: Sacha Lansky <[email protected]>

* Update README.md

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Co-authored-by: lisa-parity <[email protected]>

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---------

Co-authored-by: Sacha Lansky <[email protected]>
Co-authored-by: lisa-parity <[email protected]>
Co-authored-by: parity-processbot <>
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# Substrate Node Template

[![Try on playground](https://img.shields.io/badge/Playground-Node_Template-brightgreen?logo=Parity%20Substrate)](https://docs.substrate.io/playground/) [![Matrix](https://img.shields.io/matrix/substrate-technical:matrix.org)](https://matrix.to/#/#substrate-technical:matrix.org)
A fresh [Substrate](https://substrate.io/) node, ready for hacking :rocket:

A fresh FRAME-based [Substrate](https://www.substrate.io/) node, ready for hacking :rocket:
A standalone version of this template is available for each release of Polkadot in the [Substrate Developer Hub Parachain Template](https://github.com/substrate-developer-hub/substrate-parachain-template/) repository.
The parachain template is generated directly at each Polkadot release branch form the [Node Template in Substreate](https://github.com/paritytech/substrate/tree/master/bin/node-template) upstream

## Getting Started

Follow the steps below to get started with the Node Template, or get it up and running right from
your browser in just a few clicks using
the [Substrate Playground](https://docs.substrate.io/playground/) :hammer_and_wrench:

### Using Nix

Install [nix](https://nixos.org/) and optionally [direnv](https://github.com/direnv/direnv) and
[lorri](https://github.com/nix-community/lorri) for a fully plug and play experience for setting up
the development environment. To get all the correct dependencies activate direnv `direnv allow` and
lorri `lorri shell`.

### Rust Setup
It is usually best to to use the stand-alone version to start a new project.
All bugs, suggestions, and feature requests should be made upstream in the [Substrate](https://github.com/paritytech/substrate/tree/master/bin/node-template) repository.

First, complete the [basic Rust setup instructions](./docs/rust-setup.md).

### Run
## Getting Started

Use Rust's native `cargo` command to build and launch the template node:

```sh
cargo run --release -- --dev
```
Depending on your operating system and Rust version, there might be additional packages required to compile this template.
Check the [Install](https://docs.substrate.io/install/) instructions for your platform for the most common dependencies.
Alternatively, you can use one of the [alternative installation](#alternatives-installations) options.

### Build

The `cargo run` command will perform an initial build. Use the following command to build the node
without launching it:
Use the following command to build the node without launching it:

```sh
cargo build --release
```

### Embedded Docs

Once the project has been built, the following command can be used to explore all parameters and
subcommands:
After you build the project, you can use the following command to explore its parameters and subcommands:

```sh
./target/release/node-template -h
```

## Run
You can generate and view the [Rust Docs](https://doc.rust-lang.org/cargo/commands/cargo-doc.html) for this template with this command:

The provided `cargo run` command will launch a temporary node and its state will be discarded after
you terminate the process. After the project has been built, there are other ways to launch the
node.
```sh
cargo +nightly doc --open
```

### Single-Node Development Chain

This command will start the single-node development chain with non-persistent state:
The following command starts a single-node development chain that doesn't persist state:

```bash
```sh
./target/release/node-template --dev
```

Purge the development chain's state:
To purge the development chain's state, run the following command:

```bash
```sh
./target/release/node-template purge-chain --dev
```

Start the development chain with detailed logging:
To start the development chain with detailed logging, run the following command:

```bash
```sh
RUST_BACKTRACE=1 ./target/release/node-template -ldebug --dev
```

> Development chain means that the state of our chain will be in a tmp folder while the nodes are
> running. Also, **alice** account will be authority and sudo account as declared in the
> [genesis state](https://github.com/substrate-developer-hub/substrate-node-template/blob/main/node/src/chain_spec.rs#L49).
> At the same time the following accounts will be pre-funded:
> - Alice
> - Bob
> - Alice//stash
> - Bob//stash
In case of being interested in maintaining the chain' state between runs a base path must be added
so the db can be stored in the provided folder instead of a temporal one. We could use this folder
to store different chain databases, as a different folder will be created per different chain that
is ran. The following commands shows how to use a newly created folder as our db base path.

```bash
Development chains:

- Maintain state in a `tmp` folder while the node is running.
- Use the **Alice** and **Bob** accounts as default validator authorities.
- Use the **Alice** account as the default `sudo` account.
- Are preconfigured with a genesis state (`/node/src/chain_spec.rs`) that includes several prefunded development accounts.


To persist chain state between runs, specify a base path by running a command similar to the following:

```sh
// Create a folder to use as the db base path
$ mkdir my-chain-state

Expand All @@ -103,23 +82,19 @@ $ ls ./my-chain-state/chains/dev
db keystore network
```

### Connect with Polkadot-JS Apps Front-End

### Connect with Polkadot-JS Apps Front-end

Once the node template is running locally, you can connect it with **Polkadot-JS Apps** front-end
to interact with your chain. [Click
here](https://polkadot.js.org/apps/#/explorer?rpc=ws://localhost:9944) connecting the Apps to your
local node template.
After you start the node template locally, you can interact with it using the hosted version of the [Polkadot/Substrate Portal](https://polkadot.js.org/apps/#/explorer?rpc=ws://localhost:9944) front-end by connecting to the local node endpoint.
A hosted version is also available on [IPFS (redirect) here](https://dotapps.io/) or [IPNS (direct) here](ipns://dotapps.io/?rpc=ws%3A%2F%2F127.0.0.1%3A9944#/explorer).
You can also find the source code and instructions for hosting your own instance on the [polkadot-js/apps](https://github.com/polkadot-js/apps) repository.

### Multi-Node Local Testnet

If you want to see the multi-node consensus algorithm in action, refer to our
[Simulate a network tutorial](https://docs.substrate.io/tutorials/get-started/simulate-network/).
If you want to see the multi-node consensus algorithm in action, see [Simulate a network](https://docs.substrate.io/tutorials/get-started/simulate-network/).

## Template Structure

A Substrate project such as this consists of a number of components that are spread across a few
directories.
A Substrate project such as this consists of a number of components that are spread across a few directories.

### Node

Expand All @@ -128,98 +103,74 @@ Substrate-based blockchain nodes expose a number of capabilities:

- Networking: Substrate nodes use the [`libp2p`](https://libp2p.io/) networking stack to allow the
nodes in the network to communicate with one another.
- Consensus: Blockchains must have a way to come to
[consensus](https://docs.substrate.io/main-docs/fundamentals/consensus/) on the state of the
network. Substrate makes it possible to supply custom consensus engines and also ships with
several consensus mechanisms that have been built on top of
[Web3 Foundation research](https://research.web3.foundation/en/latest/polkadot/NPoS/index.html).
- Consensus: Blockchains must have a way to come to [consensus](https://docs.substrate.io/fundamentals/consensus/) on the state of the network.
Substrate makes it possible to supply custom consensus engines and also ships with several consensus mechanisms that have been built on top of [Web3 Foundation research](https://research.web3.foundation/en/latest/polkadot/NPoS/index.html).
- RPC Server: A remote procedure call (RPC) server is used to interact with Substrate nodes.

There are several files in the `node` directory - take special note of the following:

- [`chain_spec.rs`](./node/src/chain_spec.rs): A
[chain specification](https://docs.substrate.io/main-docs/build/chain-spec/) is a
source code file that defines a Substrate chain's initial (genesis) state. Chain specifications
are useful for development and testing, and critical when architecting the launch of a
production chain. Take note of the `development_config` and `testnet_genesis` functions, which
are used to define the genesis state for the local development chain configuration. These
functions identify some
[well-known accounts](https://docs.substrate.io/reference/command-line-tools/subkey/)
and use them to configure the blockchain's initial state.
- [`service.rs`](./node/src/service.rs): This file defines the node implementation. Take note of
the libraries that this file imports and the names of the functions it invokes. In particular,
there are references to consensus-related topics, such as the
[block finalization and forks](https://docs.substrate.io/main-docs/fundamentals/consensus/#finalization-and-forks)
and other [consensus mechanisms](https://docs.substrate.io/main-docs/fundamentals/consensus/#default-consensus-models)
such as Aura for block authoring and GRANDPA for finality.

After the node has been [built](#build), refer to the embedded documentation to learn more about the
capabilities and configuration parameters that it exposes:

```shell
./target/release/node-template --help
```
There are several files in the `node` directory.
Take special note of the following:

- [`chain_spec.rs`](./node/src/chain_spec.rs): A [chain specification](https://docs.substrate.io/build/chain-spec/) is a source code file that defines a Substrate chain's initial (genesis) state.
Chain specifications are useful for development and testing, and critical when architecting the launch of a production chain.
Take note of the `development_config` and `testnet_genesis` functions,.
These functions are used to define the genesis state for the local development chain configuration.
These functions identify some [well-known accounts](https://docs.substrate.io/reference/command-line-tools/subkey/) and use them to configure the blockchain's initial state.
- [`service.rs`](./node/src/service.rs): This file defines the node implementation.
Take note of the libraries that this file imports and the names of the functions it invokes.
In particular, there are references to consensus-related topics, such as the [block finalization and forks](https://docs.substrate.io/fundamentals/consensus/#finalization-and-forks) and other [consensus mechanisms](https://docs.substrate.io/fundamentals/consensus/#default-consensus-models) such as Aura for block authoring and GRANDPA for finality.



### Runtime

In Substrate, the terms
"runtime" and "state transition function"
are analogous - they refer to the core logic of the blockchain that is responsible for validating
blocks and executing the state changes they define. The Substrate project in this repository uses
[FRAME](https://docs.substrate.io/main-docs/fundamentals/runtime-intro/#frame) to construct a
blockchain runtime. FRAME allows runtime developers to declare domain-specific logic in modules
called "pallets". At the heart of FRAME is a helpful
[macro language](https://docs.substrate.io/reference/frame-macros/) that makes it easy to
create pallets and flexibly compose them to create blockchains that can address
[a variety of needs](https://substrate.io/ecosystem/projects/).

Review the [FRAME runtime implementation](./runtime/src/lib.rs) included in this template and note
the following:

- This file configures several pallets to include in the runtime. Each pallet configuration is
defined by a code block that begins with `impl $PALLET_NAME::Config for Runtime`.
- The pallets are composed into a single runtime by way of the
[`construct_runtime!`](https://crates.parity.io/frame_support/macro.construct_runtime.html)
macro, which is part of the core
FRAME Support [system](https://docs.substrate.io/reference/frame-pallets/#system-pallets) library.
In Substrate, the terms "runtime" and "state transition function" are analogous.
Both terms refer to the core logic of the blockchain that is responsible for validating blocks and executing the state changes they define.
The Substrate project in this repository uses [FRAME](https://docs.substrate.io/fundamentals/runtime-development/#frame) to construct a blockchain runtime.
FRAME allows runtime developers to declare domain-specific logic in modules called "pallets".
At the heart of FRAME is a helpful [macro language](https://docs.substrate.io/reference/frame-macros/) that makes it easy to create pallets and flexibly compose them to create blockchains that can address [a variety of needs](https://substrate.io/ecosystem/projects/).

Review the [FRAME runtime implementation](./runtime/src/lib.rs) included in this template and note the following:

- This file configures several pallets to include in the runtime.
Each pallet configuration is defined by a code block that begins with `impl $PALLET_NAME::Config for Runtime`.
- The pallets are composed into a single runtime by way of the [`construct_runtime!`](https://crates.parity.io/frame_support/macro.construct_runtime.html) macro, which is part of the core FRAME Support [system](https://docs.substrate.io/reference/frame-pallets/#system-pallets) library.

### Pallets

The runtime in this project is constructed using many FRAME pallets that ship with the
[core Substrate repository](https://github.com/paritytech/substrate/tree/master/frame) and a
template pallet that is [defined in the `pallets`](./pallets/template/src/lib.rs) directory.
The runtime in this project is constructed using many FRAME pallets that ship with the [core Substrate repository](https://github.com/paritytech/substrate/tree/master/frame) and a template pallet that is [defined in the `pallets`](./pallets/template/src/lib.rs) directory.

A FRAME pallet is compromised of a number of blockchain primitives:

- Storage: FRAME defines a rich set of powerful
[storage abstractions](https://docs.substrate.io/main-docs/build/runtime-storage/) that makes
it easy to use Substrate's efficient key-value database to manage the evolving state of a
blockchain.
- Dispatchables: FRAME pallets define special types of functions that can be invoked (dispatched)
from outside of the runtime in order to update its state.
- Events: Substrate uses [events and errors](https://docs.substrate.io/main-docs/build/events-errors/)
to notify users of important changes in the runtime.
- Storage: FRAME defines a rich set of powerful [storage abstractions](https://docs.substrate.io/build/runtime-storage/) that makes it easy to use Substrate's efficient key-value database to manage the evolving state of a blockchain.
- Dispatchables: FRAME pallets define special types of functions that can be invoked (dispatched) from outside of the runtime in order to update its state.
- Events: Substrate uses [events and errors](https://docs.substrate.io/build/events-and-errors/) to notify users of important changes in the runtime.
- Errors: When a dispatchable fails, it returns an error.
- Config: The `Config` configuration interface is used to define the types and parameters upon
which a FRAME pallet depends.
- Config: The `Config` configuration interface is used to define the types and parameters upon which a FRAME pallet depends.

## Alternatives Installations

Instead of installing dependencies and building this source directly, consider the following alternatives.

### Run in Docker
### Nix

First, install [Docker](https://docs.docker.com/get-docker/) and
[Docker Compose](https://docs.docker.com/compose/install/).
Install [nix](https://nixos.org/), and optionally [direnv](https://github.com/direnv/direnv) and [lorri](https://github.com/nix-community/lorri) for a fully plug-and-play experience for setting up the development environment.
To get all the correct dependencies, activate direnv `direnv allow` and lorri `lorri shell`.

### Docker

First, install [Docker](https://docs.docker.com/get-docker/) and [Docker Compose](https://docs.docker.com/compose/install/).

Then run the following command to start a single node development chain.

```bash
```sh
./scripts/docker_run.sh
```

This command will firstly compile your code, and then start a local development network. You can
also replace the default command
(`cargo build --release && ./target/release/node-template --dev --ws-external`)
by appending your own. A few useful ones are as follow.
This command compiles the code and starts a local development network.
You can also replace the default command (`cargo build --release && ./target/release/node-template --dev --ws-external`) by appending your own.
For example:

```bash
```sh
# Run Substrate node without re-compiling
./scripts/docker_run.sh ./target/release/node-template --dev --ws-external

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