FrontierBlockImport and Moonbeam's Dual Parachain/Standalone Runtime

Moonbeam is much more than just an EVM implementation: it’s a highly specialized Layer 1.5 chain that mirrors Ethereum’s Web3 RPC, accounts, keys, subscriptions, logs, and more. The Moonbeam platform extends the base Ethereum feature set with additional features such as on-chain governance, staking, and cross-chain integrations.

#moonbeam #ethereum #substrate #web3 #blockchain

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FrontierBlockImport and Moonbeam's Dual Parachain/Standalone Runtime

FrontierBlockImport and Moonbeam's Dual Parachain/Standalone Runtime

Moonbeam is much more than just an EVM implementation: it’s a highly specialized Layer 1.5 chain that mirrors Ethereum’s Web3 RPC, accounts, keys, subscriptions, logs, and more. The Moonbeam platform extends the base Ethereum feature set with additional features such as on-chain governance, staking, and cross-chain integrations.

#moonbeam #ethereum #substrate #web3 #blockchain

How to convert a Substrate FRAME based runtime into a Cumulus Parachain runtime

This workshop focuses on showing how to convert a Substrate FRAME based runtime into a Cumulus parachain runtime. The Polkadot relay chain will allow two Parchains to interact in a decentralized and reliable way.

We will simulate a real case scenario in which one parachain pays another parachain for the services it did on their behalf.

Talk: Parachains Workshop
Speakers: Ricardo Rius · Runtime Engineer, Parity
Recorded at Sub0 Online on October 15th, 2020

#substrate #cumulus #parachain #blockchain

Sigrid  Farrell

Sigrid Farrell


Customizing CORS Filtering at Runtime

Let’s make CORS work for you.

Cross-origin resource sharing (CORS) is a mechanism that controls the AJAX calls to your resources outside the current origin. In some cases, you need to allow some origins to make these kinds of calls. For example, if you have a SAAS based product, there will be some clients who are connecting to your API and making AJAX calls.

In Spring, there are several ways to check the origin, method, headers, etc., of incoming requests.

You can use WebSecurityConfigurerAdapter in Spring Security, and WebMvcConfigurer@CrossOrigin annotation, CorsFilter in Spring MVC.

We are providing a SaaS-based payment and wallet application. We’re serving our payment page via JavaScript, and so many CORS requests come from our clients. In our case, we needed to change allowed origins dynamically because some merchants may be added, deleted, or updated.

Our tech stack in this project consists of Spring Boot, Spring Cloud, Netflix OSS, and our gateway is Netflix Zuul.

#java #tutorial #spring #runtime #cors #customizing cors filtering at runtime

Moonbeam: an Ethereum-compatible Smart Contract Parachain on Polkadot

Run an alphanet node with Docker

Docker images are published for every tagged release. Learn more with moonbeam --help.

# Join the public testnet
docker run --network="host" purestake/moonbeam:v0.19.1 --chain alphanet

You can find more detailed instructions to run a full node in our TestNet

Run a local development node with Docker

Developers who are building dApps to run on moonbeam, may want a lightweight node to work with locally. You can quickly spin up a single node with no relay chain backing it using the development service.

# Run a dev service node
docker run --network="host" purestake/moonbeam:v0.19.1 --dev

For more information, see our detailed instructions to run a development node

Sealing options

The command above will start the node in instant seal mode. It creates a block when a transaction arrives, similar to Ganache's auto-mine. You can also choose to author blocks at a regular interval, or control authoring manually through the RPC.

# Author a block every 6 seconds.
docker run --network="host" purestake/moonbeam:v0.19.1 --dev --sealing 6000

# Manually control the block authorship and finality
docker run --network="host" purestake/moonbeam:v0.19.1 --dev --sealing manual

Prefunded Development Addresses

Running Moonbeam in development mode will pre-fund several well-known addresses that (mostly) contain the letters "th" in their names to remind you that they are for ethereum-compatible usage. These addresses are derived from Substrate's canonical mnemonic: bottom drive obey lake curtain smoke basket hold race lonely fit walk

# Alith:
- Address: 0xf24FF3a9CF04c71Dbc94D0b566f7A27B94566cac
- PrivKey: 0x5fb92d6e98884f76de468fa3f6278f8807c48bebc13595d45af5bdc4da702133

# Baltathar:
- Address: 0x3Cd0A705a2DC65e5b1E1205896BaA2be8A07c6e0
- PrivKey: 0x8075991ce870b93a8870eca0c0f91913d12f47948ca0fd25b49c6fa7cdbeee8b

# Charleth:
- Address: 0x798d4Ba9baf0064Ec19eB4F0a1a45785ae9D6DFc
- PrivKey: 0x0b6e18cafb6ed99687ec547bd28139cafdd2bffe70e6b688025de6b445aa5c5b

# Dorothy:
- Address: 0x773539d4Ac0e786233D90A233654ccEE26a613D9
- PrivKey: 0x39539ab1876910bbf3a223d84a29e28f1cb4e2e456503e7e91ed39b2e7223d68

# Ethan:
- Address: 0xFf64d3F6efE2317EE2807d223a0Bdc4c0c49dfDB
- PrivKey: 0x7dce9bc8babb68fec1409be38c8e1a52650206a7ed90ff956ae8a6d15eeaaef4

# Faith:
- Address: 0xC0F0f4ab324C46e55D02D0033343B4Be8A55532d
- PrivKey: 0xb9d2ea9a615f3165812e8d44de0d24da9bbd164b65c4f0573e1ce2c8dbd9c8df

# Goliath:
- Address: 0x7BF369283338E12C90514468aa3868A551AB2929
- PrivKey: 0x96b8a38e12e1a31dee1eab2fffdf9d9990045f5b37e44d8cc27766ef294acf18

# Heath:
- Address: 0x931f3600a299fd9B24cEfB3BfF79388D19804BeA
- PrivKey: 0x0d6dcaaef49272a5411896be8ad16c01c35d6f8c18873387b71fbc734759b0ab

# Ida:
- Address: 0xC41C5F1123ECCd5ce233578B2e7ebd5693869d73
- PrivKey: 0x4c42532034540267bf568198ccec4cb822a025da542861fcb146a5fab6433ff8

# Judith:
- Address: 0x2898FE7a42Be376C8BC7AF536A940F7Fd5aDd423
- PrivKey: 0x94c49300a58d576011096bcb006aa06f5a91b34b4383891e8029c21dc39fbb8b

Also, the prefunded default account for testing purposes is:

# Gerald:
- Address: 0x6Be02d1d3665660d22FF9624b7BE0551ee1Ac91b
- PrivKey: 0x99b3c12287537e38c90a9219d4cb074a89a16e9cdb20bf85728ebd97c343e342

Build the Moonbeam Node

To build Moonbeam, you will need a proper Substrate development environment. If you've never worked with a Substrate-based blockchain before, you should probably try the Setting Up a Moonbeam Node docs first.

If you need a refresher setting up your Substrate environment, see Substrate's Getting Started Guide.

Note that cloning master might result in an unstable build. If you want a stable version, check out the latest releases.

# Fetch the code
git clone
cd moonbeam

# Build the node (The first build will be long (~30min))
cargo build --release

Run tests

Moonbeam has Rust unit tests as well as typescript integration tests. These tests are run in CI, and can also be run locally.

# Run the Rust unit tests
cargo test
# Install dependencies for integration tests
cd moonbeam-types-bundle
npm i

cd ../tests
npm i

# Run integration tests
npm test

Chain IDs

The Ethereum specification described a numeric Chain Id. The Moonbeam mainnet Chain Id will be 1284 because it takes 1284 milliseconds for a moonbeam to reach Earth.

Moonbeam nodes support multiple public chains and testnets, with the following Chain Ids.

Network DescriptionChain ID
Local Parachain TestNet1280
Local Development TestNet1281
Reserved for other TestNets1282 - 1283
Moonbeam (Polkadot)1284
Moonriver (Kusama)1285
Moonrock (Rococo)1286
Moonbase Alpha TestNet1287
Reserved for other public networks1288 - 1289

Runtime Architecture

The Moonbeam Runtime is built using FRAME and consists of pallets from substrate, frontier, cumulus, and pallets/.

From substrate:

  • Utility: Allows users to use derivative accounts, and batch calls
  • Balances: Tracks GLMR token balances
  • Sudo: Allows a privileged account to make arbitrary runtime changes - will be removed before launch
  • Timestamp: On-Chain notion of time
  • Transaction Payment: Transaction payment (fee) management
  • Randomness Collective Flip: A (mock) onchain randomness beacon. Will be replaced by parachain randomness by mainnet.

From frontier:

  • EVM: Encapsulates execution logic for an Ethereum Virtual Machine
  • Ethereum: Ethereum-style data encoding and access for the EVM.

From cumulus:

  • ParachainUpgrade: A helper to perform runtime upgrades on parachains
  • ParachainInfo: A place to store parachain-relevant constants like parachain id

The following pallets are stored in pallets/. They are designed for Moonbeam's specific requirements:

  • Ethereum Chain Id: A place to store the chain id for each Moonbeam network
  • Author Inherent: Allows block authors to include their identity in a block via an inherent
  • Parachain Staking: Minimal staking pallet that selects collators by total amount at stake

Download Details:
Author: PureStake
Source Code:
License: GPL-3.0 License

#rust  #blockchain  #substrate #Parachain #ethereum #polkadot 

What is Moonbeam Network (GLMR) | What is Moonbeam Network token | What is GLMR token

What is Moonbeam?

Moonbeam is a developer-oriented blockchain that strives to provide compatibility with the existing Ethereum developer toolchain and network. It does this by providing a full EVM implementation, a Web3-compatible API, and bridges that connect Moonbeam to existing Ethereum networks. This allows developers to deploy existing Solidity smart contracts and DApp frontends to Moonbeam with minimal changes.

Moonbeam will also be a parachain on the Polkadot network. That means that it will get shared security from the Polkadot relay chain and will be able to integrate with other chains that are connected to Polkadot (once that functionality is available on Polkadot).

Our Vision for Moonbeam

We believe in a multi-chain future with many chains, and many users and assets on those chains. In this context, we have created Moonbeam: a smart contract platform that provides an Ethereum-compatible environment for building decentralized applications. Moonbeam was designed to serve these new kinds of assets and users that exist across two or more chains.

Existing smart contract platforms are designed to service the users and assets on a single, specific chain. By providing cross-chain smart contract functionality, Moonbeam allows developers to shift existing workloads and logic to Moonbeam, and extend the reach of their applications to new users and assets on other chains.

Moonbeam’s cross-chain integration is accomplished by becoming a parachain on the Polkadot network. The Polkadot network provides integration and connectivity between parachains that are connected to the network, and to other non-Polkadot-based chains such as Ethereum and Bitcoin via bridges.

Who Benefits From Moonbeam

There are three main audiences who can most benefit from Moonbeam’s cross-chain functionality:

Existing Ethereum-Based Projects

Projects that are struggling with cost and scalability challenges on Ethereum can use Moonbeam to:

  • Move portions of their existing workloads and state off of Ethereum Layer 1 with minimal required changes.
  • Implement a hybrid approach, where applications live on both Ethereum and Moonbeam simultaneously.
  • Extend their reach to the Polkadot network and other chains that are connected to Polkadot.

Polkadot Ecosystem Projects

Ecosystem projects that need smart contract functionality can use Moonbeam to:

  • Augment their existing parachains and parathreads.
  • Add new functionality that is needed, but not included on the main Polkadot Relay Chain. For example, they could create a place where teams can crowdfund their projects, implement lockdrops, and process other, more complex financial transactions than are provided by base Substrate functionality.
  • Leverage the mature and extensive Ethereum development toolchain.

Developers of New DApps

Individuals and teams that want to try building on Polkadot can use Moonbeam to:

  • Leverage the specialized functionality from Polkadot parachains while reaching users and assets on other chains.
  • Compose functionality from Polkadot parachains by using Moonbeam as a lightweight integration layer that aggregates network services before presenting them to end users. Implementing a composed service using pre-built integrations on a smart contract platform will be a lot faster and easier (in many cases) than building a full Substrate runtime, and performing the integrations yourself in the runtime.

Key Features and Functionality

Moonbeam achieves these goals with the following key features:

  • Decentralized and Permissionless — a base requirement for censorship resistance, and to support many existing and future DApp use cases.
  • Contains a Full EVM Implementation — so existing Solidity-based smart contracts can be migrated with minimal change and with expected execution results.
  • Implements the Web3 RPC API — so existing DApp front-ends can be migrated with minimal change required, and so that existing Ethereum-based tools such as Truffle, Remix, and MetaMask can be used without modification against Moonbeam.
  • Compatibility with the Substrate Ecosystem Toolset — including block explorers, front-end development libraries, and wallets, giving developers and users the ability to use the right tool for what they are trying to accomplish.
  • Native Cross-Chain Integration — via the Polkadot network and via token bridges which allows for token movement, state visibility, and message passing with Ethereum and other chains.
  • On-Chain Governance to allow stakeholders to quickly and forklessly evolve the base protocol according to developer and community needs.

This unique combination of elements fills a strategic market gap, while at the same time allowing Moonbeam to address future developer needs as the Polkadot network grows over time. Building your own chain with Substrate is powerful, but also comes with a number of additional responsibilities such as learning and implementing the chain’s runtime in Rust, creating a token economy, and incentivizing a community of node operators.

For many developers and projects, an Ethereum-compatible smart contract approach will be much simpler and faster to implement. And by building these smart contracts on Moonbeam, developers can still integrate with other chains and get value from Polkadot-based network effects.

Why We’re Building on Polkadot

After extensive research, we decided to build Moonbeam using the Substrate development framework and to deploy Moonbeam as a parachain on the Polkadot network.

Substrate Blockchain Framework

Substrate is a good technical fit for Moonbeam. By building on top of this framework, we can leverage the extensive functionality that Substrate includes out-of-the-box, rather than needing to build it ourselves. This includes peer-to-peer networking, consensus mechanisms, governance functionality, an EVM implementation, and more.

Overall, using Substrate will dramatically reduce the time and implementation effort needed to implement Moonbeam. Substrate allows a great degree of customization, which is necessary in order to achieve our Ethereum compatibility goals. And, by using Rust, we benefit from both safety guarantees and performance gains.

Polkadot Network and Ecosystem

The Polkadot network is also a good fit for Moonbeam. As a parachain on Polkadot, Moonbeam will be able to directly integrate with — and move tokens between — any other parachains and parathreads on the network.

We also can leverage any of the bridges that are independently built to connect non-Polkadot chains to Polkadot, including bridges to Ethereum. Polkadot’s interoperability model uniquely supports Moonbeam’s cross-chain integration goals and is a key enabling technology to support the Moonbeam vision.

But perhaps just as important as the technical criteria above, we are impressed with the people in the Polkadot ecosystem. This includes individuals who at Parity or the Web3 Foundation, as well as other projects in the ecosystem. We have built many valuable relationships and find the people to be both extremely talented and to be the kind of people we want to be around.

Smart Contracts, Powered by the Glimmer Token

As a decentralized smart contract platform, Moonbeam requires a utility token to function. Our token, Glimmer (GLMR), is central to the design of the network and can’t be removed without sacrificing security and essential functionality.

The Glimmer token is not yet available. Subscribe to our newsletter to be notified when token distribution plans are announced.

Smart Contract Execution

Glimmer is used to pay for smart contract execution, playing the same role that ETH does on Ethereum.

Transaction Fees

All transaction fees are paid for with Glimmer.


Nominate collators using the Glimmer token and help support the liveness of the network.


Participate in on-chain Glimmer-weighted voting and governance.

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source :

How and Where to Buy Moonbeam Network (GLMR)?

You will have to first buy one of the major cryptocurrencies, usually either Bitcoin (BTC), Ethereum (ETH), Tether (USDT)…

We will use Binance Exchange here as it is one of the largest crypto exchanges that accept fiat deposits.

Binance is a popular cryptocurrency exchange which was started in China but then moved their headquarters to the crypto-friendly Island of Malta in the EU. Binance is popular for its crypto to crypto exchange services. Binance exploded onto the scene in the mania of 2017 and has since gone on to become the top crypto exchange in the world.

Once you finished the KYC process. You will be asked to add a payment method. Here you can either choose to provide a credit/debit card or use a bank transfer, and buy one of the major cryptocurrencies, usually either Bitcoin (BTC), Ethereum (ETH), Tether (USDT)


Step by Step Guide : What is Binance | How to Create an account on Binance (Updated 2021)

Next step - Transfer your cryptos to an Altcoin Exchange

Since GLMR is an altcoin we need to transfer our coins to an exchange that GLMR can be traded. Below is a list of exchanges that offers to trade GLMR in various market pairs, head to their websites and register for an account.

Once finished you will then need to make a BTC/ETH/USDT deposit to the exchange from Binance depending on the available market pairs. After the deposit is confirmed you may then purchase GLMR from the exchange.

Exchange: …

Apart from the exchange(s) above, there are a few popular crypto exchanges where they have decent daily trading volumes and a huge user base. This will ensure you will be able to sell your coins at any time and the fees will usually be lower. It is suggested that you also register on these exchanges since once GLMR gets listed there it will attract a large amount of trading volumes from the users there, that means you will be having some great trading opportunities!

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Find more information GLMR

☞ Website
☞ Announcement
☞ Source Code
☞ Social Channel
☞ Documentation
☞ Coinmarketcap

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#blockchain #bitcoin #cryptocurrency #moonbeam #glmr