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

What is GEEK

Buddha Community

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

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.

Image for post

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!

Top exchanges for token-coin trading. Follow instructions and make unlimited money

Find more information GLMR

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

Learn about Cryptocurrency in this article ☞ What You Should Know Before Investing in Cryptocurrency - For Beginner

Would you like to earn many tokens and cryptocurrencies right now! ☞ CLICK HERE

Thank for visiting and reading this article! I’m highly appreciate your actions! Please share if you liked it!

#blockchain #bitcoin #cryptocurrency #moonbeam #glmr

Parachain là gì? BẢN CHẤT Parachain protocol của Polkadot là gì?

Parachain là gì?
Parachain là gì? Được định nghĩa là một loạt chuỗi con trực thuộc mạng lưới chính của Polkadot, có thể hoạt động độc lập. Parachain là một nhánh blockchain được gắn với chuỗi chính Relay Chain của Pokadot, chuỗi này kết nối với chuỗi chính dựa trên các giao thức và trình thiết kế cơ sở dữ liệu proof of Sharding, kết hợp trình xác thực Proof of Validity, và Proof of Stake để tạo khối.