Nandu Singh

Nandu Singh

1628480531

How to run a script in crontab every 5 hours?

Crontab expression every 5 hours is a commonly used cron schedule. 

0 */5 * * *

The following key shows how each position in the cron pattern string is interpreted:

* * * * * *
| | | | | |
| | | | | day of week
| | | | month
| | | day of month
| | hour
| minute
second (optional)

How to run a script in crontab every 5 hours?

Cron Job lets you run a script to do a repetitive job in an efficient way, here's how you can schedule a cronjob for every 5 hours:

Step 1: Edit your cronjob file by running "crontab -e" command

crontab -e

Step 2: Add the following line for every 5 hours interval:

0 */5 * * * /home/ubuntu/backup.sh

Step 3: Save the file. Done!

How to restart cron after change crontab?

Cron will then examine the modification time on all crontab and reload those which have changed. Thus cron need not be restarted whenever a crontab file is modified.

But if you just want to make sure its done anyway:

sudo service cron reload

or

/etc/init.d/cron reload
sudo service cron restart
sudo systemctl reload crond

Happy coding!

What is GEEK

Buddha Community

How to run a script in crontab every 5 hours?
Akshara Singh

Akshara Singh

1622015491

Bitcoin Exchange script | Cryptocurrency Exchange Script | Free Live Demo @ Coinsclone

Hey peeps, Hope you all are safe & going well

Many entrepreneurs & startups are interested to start a crypto exchange platform by using a cryptocurrency exchange script, you know why??? Let me explain. Before that, you need to know what is a cryptocurrency exchange script???

What is Cryptocurrency Exchange Script???

Cryptocurrency Exchange Script is an upgrade version of all exchange platforms, it is also called ready-made script or software. By using the crypto exchange script you can launch your crypto trading platform instantly. It is one of the easiest and fastest ways to start your crypto exchange business. Also, it helps to launch your exchange platform within 7 days.

Benefits of Bitcoin Exchange Script:

  • Customizing options - They will help you to build your cryptocurrency exchange platform based on your business needs.
  • Monitor and Engage - You can easily monitor the work process
  • Beta module - You can test your exchange in the Beta module
  • Cost-effective - The development will be around $8k - $15k (It may be vary based on the requirement)
  • Time-Period - You can launch your exchange within 1 week

Best Trading & Security Features of Bitcoin Exchange Script:

  • Multi-language
  • IEO launchpad,
  • Crypto wallet,
  • Instant buying/selling cryptocurrencies
  • Staking and lending
  • Live trading charts with margin trading API and futures 125x trading
  • Stop limit order and stop-loss orders
  • Limit maker orders
  • Multi-cryptocurrencies Support
  • Referral options
  • Admin panel
  • Perpetual swaps
  • Advanced UI/UX
  • Security Features [HTTPs authentication, Biometric authentication, Jail login, Data encryption, Two-factor authentication, SQL injection prevention, Anti Denial of Service(DoS), Cross-Site Request Forgery(CSRF) protection, Server-Side Request Forgery(SSRF) protection, Escrow services, Anti Distributed Denial of Service]

The More Important one is “Where to get the best bitcoin exchange script?”

Where to get the best bitcoin exchange script?

No one couldn’t answer the question directly because a lot of software/script providers are available in the crypto market. Among them, finding the best script provider is not an easy task. You don’t worry about that. I will help you. I did some technical inspection to find the best bitcoin exchange script provider in the techie world. Speaking of which, one software provider, Coinsclone got my attention. They have successfully delivered 100+ secured bitcoin exchanges, wallets & payment gateways to their global clients. No doubt that their exchange software is 100% bug-free and it is tightly secured. They consider customer satisfaction as their priority and they are always ready to customize your exchange based on your desired business needs.

Of course, it kindles your business interest; but before leaping, you can check their free live demo at Bitcoin Exchange Script.

Are you interested in business with them, then connect their business experts directly via

Whatsapp/Telegram: +919500575285

Mail: hello@coinsclone.com

Skype: live:hello_20214

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HYIP Investment Script: Twisted It with Crowdfunding & Lending Platform - Benefits Of It!

Are you wanting to be an Entrepreneur? A Business using cryptocurrency? Then this article is for you.

As a beginner, always one prefers fair play. But to the least, initiating business in the streams of cryptocurrency carries a varying degree of risks. We all know that, Every business packs the profit only if we are ready to take risks. But flabbergast is, you can avoid unnecessary risk, If you choose our Twisted HYIP Investment script. You don’t need to play poker with your hard-earned Money.

Using minimal investment, You can start a beneficial business.

Craze for cryptocurrency is now seeming to be unlimited, Using the Twisted HYIP platform you will get funds for running the lending business- this is the one line of the process.

This is image title

First, let me make plain, How our traditional HYIP works?

You can create a number of investment plans with attractive and promising Rate of interest. Investors will invest in those plans and get their interest periodically.

How you will provide them interest? You have to collect the investments and use them for your own project, Trading, Stock marketing and so on.

What if you don’t find a right platform to grow your investor’s funds. You will lack in processing their interest, and it will be filthy, right?

How it works?

So this Twisted HYIP platform clear this shady cloud and brings you the best place to grow your investors’ funds. With our platform you can run Investment as well as lending platform together. You will run a traditional HYIP script for your investors stating the fixed Rate of interest with validity for processing their principle back.

Instead of using the crowded funds in different platform, You can use it for lending to borrowers in your platform at an interest rate higher than promised to your investors. Now you can pay back the investors as well as you will get a constant flow of income for you.

This is image title

Instead of generating promised interest rate daily or monthly, You can also make it as a doubler with long term duration. So you can use the investors fund as well as lenders repay again and again.

Every investor can monitor their investment growth in their dashboard. They will get back their invested amount plus additional ROI only when their investment gets matures. But they can see, how their wallet is loaded with profits without any risk.

Possibility of being a Profitable business

  1. Cryptocurrencies are now obligatory assets. We can predict it as future currency, which sweep away the paper currency. An anxiousness to earn more Cryptocurrency with minimal investment, attracts more people.
  2. Everyone will have a dream to achieve. They will be loaded with talents, but lack of funds. You can be a lender with handsome interest.
  3. Not only for Cryptos, You can use the same script for fiats and live ERC20 tokens. So there are many doors to knock. If one shuts you kick the other.
  4. You can use a single script as Stacking for Erc20, HYIP with promised returns, lending with an affordable rate of interest and also as a Doubler.

Crucial bits of Twisted HYIP

  • Easy to Navigate and Highly informative Admin dashboard
  • Continuous growth monitors with a wide range of opportunities in Investor Dashboard
  • Affordable deals with more information loaded Borrower Dashboard
  • Third party integrated AML/KYC Security segments
  • Multiple cryptocurrency supportable payment methods
  • Useful Affiliate system and level bonuses.
  • Highly customizable
  • Perform multiple script

Cryptocurrency market is blooming one, as per the voices of many financial expertise, prediction for end of digital currency is a blue moon. This twisted HYIP will create its own market as a perception for profit is getting increased every day among the people.

Now are you ready to launch your own lending platform? then Connect with KIR HYIP to know more interesting features about the platform. There is always space to add your ideas.

Under a short span of time, launch your own turnkey based lending platform. The World is running behind Profit, what are you waiting for? Join the club now and get the free HYIP software demo!

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HYIP Script & ICO Script - Where to Buy It?

HYIP projects are one of the growth trends of the internet and many investors are involved in it.

One of the quickest ways to get rich today is because so many people want to join this network.

Hyip concept is often referred to as a high-yield investment plan or scheme, while the main difference between this and other types of investments is high-yield and low-yield.
There are many HYIPs with different investment plans. Those are, Short and long term.

Start your own investment site by hand with the best HYIP script.

Explore every part of our software packaged with responsive design, multiple projects, and multiple currency support features. They provide quality products associated with efficient product endeavors that make our product shine in every aspect.

Sign in to the HYIP script demo now for free and explore its features and installation process.

Initial Coin Offering Projects:

In Today’s trend, ICO script also created a vast impact on collecting funds and gaining benefits valuable operations. The cost for building an ICO website is made easy as it is based on customers’ specifications of features.

Look into the constructive features as it holds the top graded properties and it supplies essential tokens needed for crowdfunding campaigns. The best software provider KIR HYIP presents a prodigious product.

The ICO Script is coordinated with corresponding lending and affiliate programs that actually work in a format of allowing investors to purchase tokens during a crowd sale and then provides right to get a guaranteed interest return in accordance with the amount of tokens purchased over a period of time.

The product is furnished with more attractive and essential features that support

  • Multiple payment methods
  • Fund transfer facility
  • Referral programs
  • Multiple currency
  • Google analytics
  • Promotional tools
  • Favicon
  • QR codes

Also, the script supports various cryptocurrencies in order to collect funds in an effective method. It is a combination for making investment and donation. The uncertainty over secure transactions is cleared out with strong security mechanism.

In comparison with the features the software comes up with the quality assured price. Check the demo here: ICO Script Demo

#hyip script #hyip software #bitcoin hyip script #buy hyip script #best hyip script #ico script

Akshara Singh

Akshara Singh

1613728728

Which is the best cryptocurrency exchange script?

Are you interested in starting a cryptocurrency exchange??? Congrats, you’ve chosen the right business idea at the right time!!! Because cryptocurrency is gonna boom in the upcoming days. Recently, many governments are legalizing cryptocurrency in their countries. And more importantly, the pride of cryptocurrencies “Bitcoin crossed more than $50K”. So this is the right time to originate your crypto exchange business. Now you will have a question like this “How to start a bitcoin exchange in a safe & secure way?” For your unanswered question. I suggest a simple solution, that is “Bitcoin Exchange Clone Script”. But there are lots of crypto exchange clone scripts in the crypto market. Here I listed the Top 10 Cryptocurrency Exchange Scripts check it out below.

Top 10 Cryptocurrency Exchange Scripts:

  1. Binance clone script
  2. LocalBitcoins clone script
  3. Coinbase clone script
  4. Paxful clone script
  5. Remitano clone script
  6. Bitstamp clone script
  7. Bithumb clone script
  8. Wazirx clone script
  9. Poloniex clone script
  10. Kucoin clone script

Among these clone scripts many cryptopreneurs & enthusiasts most commonly use only 3 cryptocurrency exchange scripts.

These are 3 cryptocurrency exchange clone scripts that are widely used in the crypto space. “Who Provides these cryptocurrency exchange scripts???” That’s really hard to find because many crypto exchange clone script firms are available in the crypto market. So, finding the best one will be a kind of complicated task. Don’t worry; I will help you. I’ve done some technical aspects to identify & find the best crypto exchange clone script provider, as the end of the result one script/software provider (Coinsclone) cleared all my technical & non-technical hurdles. Coinsclone is one of the professional crypto exchange clone script providers. Their software/script is 100% secured & bug-free because their primary motto is client stratification. So that they have clients from all over the world. Till now they have successfully delivered 100+ crypto projects (Crypto exchange, Wallets & Payment gateway) for their clients.

If you are interested, you can check their free live demo @ Bitcoin Exchange Script demo.

Or else, you want to speak with their business experts directly. You can touch their experts via,

Whatsapp / Telegram @ +919500575285

Mail: hello@coinsclone.com

Skype: live:hello_20214

#bitcoin exchange script #coinbase clone script #localbitcoins clone script #binance clone script #bitcoin exchange clone script #crypto exchange clone script

ERIC  MACUS

ERIC MACUS

1647540000

Substrate Knowledge Map For Hackathon Participants

Substrate Knowledge Map for Hackathon Participants

The Substrate Knowledge Map provides information that you—as a Substrate hackathon participant—need to know to develop a non-trivial application for your hackathon submission.

The map covers 6 main sections:

  1. Introduction
  2. Basics
  3. Preliminaries
  4. Runtime Development
  5. Polkadot JS API
  6. Smart Contracts

Each section contains basic information on each topic, with links to additional documentation for you to dig deeper. Within each section, you'll find a mix of quizzes and labs to test your knowledge as your progress through the map. The goal of the labs and quizzes is to help you consolidate what you've learned and put it to practice with some hands-on activities.

Introduction

One question we often get is why learn the Substrate framework when we can write smart contracts to build decentralized applications?

The short answer is that using the Substrate framework and writing smart contracts are two different approaches.

Smart contract development

Traditional smart contract platforms allow users to publish additional logic on top of some core blockchain logic. Since smart contract logic can be published by anyone, including malicious actors and inexperienced developers, there are a number of intentional safeguards and restrictions built around these public smart contract platforms. For example:

Fees: Smart contract developers must ensure that contract users are charged for the computation and storage they impose on the computers running their contract. With fees, block creators are protected from abuse of the network.

Sandboxed: A contract is not able to modify core blockchain storage or storage items of other contracts directly. Its power is limited to only modifying its own state, and the ability to make outside calls to other contracts or runtime functions.

Reversion: Contracts can be prone to undesirable situations that lead to logical errors when wanting to revert or upgrade them. Developers need to learn additional patterns such as splitting their contract's logic and data to ensure seamless upgrades.

These safeguards and restrictions make running smart contracts slower and more costly. However, it's important to consider the different developer audiences for contract development versus Substrate runtime development.

Building decentralized applications with smart contracts allows your community to extend and develop on top of your runtime logic without worrying about proposals, runtime upgrades, and so on. You can also use smart contracts as a testing ground for future runtime changes, but done in an isolated way that protects your network from any errors the changes might introduce.

In summary, smart contract development:

  • Is inherently safer to the network.
  • Provides economic incentives and transaction fee mechanisms that can't be directly controlled by the smart contract author.
  • Provides computational overhead to support graceful logical failures.
  • Has a low barrier to entry for developers and enables a faster pace of community interaction.

Substrate runtime development

Unlike traditional smart contract development, Substrate runtime development offers none of the network protections or safeguards. Instead, as a runtime developer, you have total control over how the blockchain behaves. However, this level of control also means that there is a higher barrier to entry.

Substrate is a framework for building blockchains, which almost makes comparing it to smart contract development like comparing apples and oranges. With the Substrate framework, developers can build smart contracts but that is only a fraction of using Substrate to its full potential.

With Substrate, you have full control over the underlying logic that your network's nodes will run. You also have full access for modifying and controlling each and every storage item across your runtime modules. As you progress through this map, you'll discover concepts and techniques that will help you to unlock the potential of the Substrate framework, giving you the freedom to build the blockchain that best suits the needs of your application.

You'll also discover how you can upgrade the Substrate runtime with a single transaction instead of having to organize a community hard-fork. Upgradeability is one of the primary design features of the Substrate framework.

In summary, runtime development:

  • Provides low level access to your entire blockchain.
  • Removes the overhead of built-in safety for performance.
  • Has a higher barrier of entry for developers.
  • Provides flexibility to customize full-stack application logic.

To learn more about using smart contracts within Substrate, refer to the Smart Contract - Overview page as well as the Polkadot Builders Guide.

Navigating the documentation

If you need any community support, please join the following channels based on the area where you need help:

Alternatively, also look for support on Stackoverflow where questions are tagged with "substrate" or on the Parity Subport repo.

Use the following links to explore the sites and resources available on each:

Substrate Developer Hub has the most comprehensive all-round coverage about Substrate, from a "big picture" explanation of architecture to specific technical concepts. The site also provides tutorials to guide you as your learn the Substrate framework and the API reference documentation. You should check this site first if you want to look up information about Substrate runtime development. The site consists of:

Knowledge Base: Explaining the foundational concepts of building blockchain runtimes using Substrate.

Tutorials: Hand-on tutorials for developers to follow. The first SIX tutorials show the fundamentals in Substrate and are recommended for every Substrate learner to go through.

How-to Guides: These resources are like the O'Reilly cookbook series written in a task-oriented way for readers to get the job done. Some examples of the topics overed include:

  • Setting up proper weight functions for extrinsic calls.
  • Using off-chain workers to fetch HTTP requests.
  • Writing tests for your pallets It can also be read from

API docs: Substrate API reference documentation.

Substrate Node Template provides a light weight, minimal Substrate blockchain node that you can set up as a local development environment.

Substrate Front-end template provides a front-end interface built with React using Polkadot-JS API to connect to any Substrate node. Developers are encouraged to start new Substrate projects based on these templates.

If you face any technical difficulties and need support, feel free to join the Substrate Technical matrix channel and ask your questions there.

Additional resources

Polkadot Wiki documents the specific behavior and mechanisms of the Polkadot network. The Polkadot network allows multiple blockchains to connect and pass messages to each other. On the wiki, you can learn about how Polkadot—built using Substrate—is customized to support inter-blockchain message passing.

Polkadot JS API doc: documents how to use the Polkadot-JS API. This JavaScript-based API allows developers to build custom front-ends for their blockchains and applications. Polkadot JS API provides a way to connect to Substrate-based blockchains to query runtime metadata and send transactions.

Quiz #1

👉 Submit your answers to Quiz #1

Basics

Set up your local development environment

Here you will set up your local machine to install the Rust compiler—ensuring that you have both stable and nightly versions installed. Both stable and nightly versions are required because currently a Substrate runtime is compiled to a native binary using the stable Rust compiler, then compiled to a WebAssembly (WASM) binary, which only the nightly Rust compiler can do.

Also refer to:

Lab #1

👉 Complete Lab #1: Run a Substrate node

Interact with a Substrate network using Polkadot-JS apps

Polkadot JS Apps is the canonical front-end to interact with any Substrate-based chain.

You can configure whichever endpoint you want it to connected to, even to your localhost running node. Refer to the following two diagrams.

  1. Click on the top left side showing your currently connected network:

assets/01-polkadot-app-endpoint.png

  1. Scroll to the bottom of the menu, open DEVELOPMENT, and choose either Local Node or Custom to specify your own endpoint.

assets/02-polkadot-app-select-endpoint.png

Quiz #2

👉 Complete Quiz #2

Lab #2

👉 Complete Lab #2: Using Polkadot-JS Apps

Notes: If you are connecting Apps to a custom chain (or your locally-running node), you may need to specify your chain's custom data types in JSON under Settings > Developer.

Polkadot-JS Apps only receives a series of bytes from the blockchain. It is up to the developer to tell it how to decode and interpret these custom data type. To learn more on this, refer to:

You will also need to create an account. To do so, follow these steps on account generation. You'll learn that you can also use the Polkadot-JS Browser Plugin (a Metamask-like browser extension to manage your Substrate accounts) and it will automatically be imported into Polkadot-JS Apps.

Notes: When you run a Substrate chain in development mode (with the --dev flag), well-known accounts (Alice, Bob, Charlie, etc.) are always created for you.

Lab #3

👉 Complete Lab #3: Create an Account

Preliminaries

You need to know some Rust programming concepts and have a good understanding on how blockchain technology works in order to make the most of developing with Substrate. The following resources will help you brush up in these areas.

Rust

You will need familiarize yourself with Rust to understand how Substrate is built and how to make the most of its capabilities.

If you are new to Rust, or need a brush up on your Rust knowledge, please refer to The Rust Book. You could still continue learning about Substrate without knowing Rust, but we recommend you come back to this section whenever in doubt about what any of the Rust syntax you're looking at means. Here are the parts of the Rust book we recommend you familiarize yourself with:

  • ch 1 - 10: These chapters cover the foundational knowledge of programming in Rust
  • ch 13: On iterators and closures
  • ch 18 - 19: On advanced traits and advanced types. Learn a bit about macros as well. You will not necessarily be writing your own macros, but you'll be using a lot of Substrate and FRAME's built-in macros to write your blockchain runtime.

How blockchains work

Given that you'll be writing a blockchain runtime, you need to know what a blockchain is, and how it works. The **Web3 Blockchain Fundamental MOOC Youtube video series provides a good basis for understanding key blockchain concepts and how blockchains work.

The lectures we recommend you watch are: lectures 1 - 7 and lecture 10. That's 8 lectures, or about 4 hours of video.

Quiz #3

👉 Complete Quiz #3

Substrate runtime development

High level architecture

To know more about the high level architecture of Substrate, please go through the Knowledge Base articles on Getting Started: Overview and Getting Started: Architecture.

In this document, we assume you will develop a Substrate runtime with FRAME (v2). This is what a Substrate node consists of.

assets/03-substrate-architecture.png

Each node has many components that manage things like the transaction queue, communicating over a P2P network, reaching consensus on the state of the blockchain, and the chain's actual runtime logic (aka the blockchain runtime). Each aspect of the node is interesting in its own right, and the runtime is particularly interesting because it contains the business logic (aka "state transition function") that codifies the chain's functionality. The runtime contains a collection of pallets that are configured to work together.

On the node level, Substrate leverages libp2p for the p2p networking layer and puts the transaction pool, consensus mechanism, and underlying data storage (a key-value database) on the node level. These components all work "under the hood", and in this knowledge map we won't cover them in detail except for mentioning their existence.

Quiz #4

👉 Complete Quiz #4

Runtime development topics

In our Developer Hub, we have a thorough coverage on various subjects you need to know to develop with Substrate. So here we just list out the key topics and reference back to Developer Hub. Please go through the following key concepts and the directed resources to know the fundamentals of runtime development.

Key Concept: Runtime, this is where the blockchain state transition function (the blockchain application-specific logic) is defined. It is about composing multiple pallets (can be understood as Rust modules) together in the runtime and hooking them up together.

Runtime Development: Execution, this article describes how a block is produced, and how transactions are selected and executed to reach the next "stage" in the blockchain.

Runtime Develpment: Pallets, this article describes what the basic structure of a Substrate pallet is consists of.

Runtime Development: FRAME, this article gives a high level overview of the system pallets Substrate already implements to help you quickly develop as a runtime engineer. Have a quick skim so you have a basic idea of the different pallets Substrate is made of.

Lab #4

👉 Complete Lab #4: Adding a Pallet into a Runtime

Runtime Development: Storage, this article describes how data is stored on-chain and how you could access them.

Runtime Development: Events & Errors, this page describe how external parties know what has happened in the blockchain, via the emitted events and errors when executing transactions.

Notes: All of the above concepts we leverage on the #[pallet::*] macro to define them in the code. If you are interested to learn more about what other types of pallet macros exist go to the FRAME macro API documentation and this doc on some frequently used Substrate macros.

Lab #5

👉 Complete Lab #5: Building a Proof-of-Existence dApp

Lab #6

👉 Complete Lab #6: Building a Substrate Kitties dApp

Quiz #5

👉 Complete Quiz #5

Polkadot JS API

Polkadot JS API is the javascript API for Substrate. By using it you can build a javascript front end or utility and interact with any Substrate-based blockchain.

The Substrate Front-end Template is an example of using Polkadot JS API in a React front-end.

  • Runtime Development: Metadata, this article describes the API allowing external parties to query what API is open for the chain. Polkadot JS API makes use of a chain's metadata to know what queries and functions are available from a chain to call.

Lab #7

👉 Complete Lab #7: Using Polkadot-JS API

Quiz #6

👉 Complete Quiz #6: Using Polkadot-JS API

Smart contracts

Learn about the difference between smart contract development vs Substrate runtime development, and when to use each here.

In Substrate, you can program smart contracts using ink!.

Quiz #7

👉 Complete Quiz #7: Using ink!

What we do not cover

A lot 😄

On-chain runtime upgrades. We have a tutorial on On-chain (forkless) Runtime Upgrade. This tutorial introduces how to perform and schedule a runtime upgrade as an on-chain transaction.

About transaction weight and fee, and benchmarking your runtime to determine the proper transaction cost.

Off-chain Features

There are certain limits to on-chain logic. For instance, computation cannot be too intensive that it affects the block output time, and computation must be deterministic. This means that computation that relies on external data fetching cannot be done on-chain. In Substrate, developers can run these types of computation off-chain and have the result sent back on-chain via extrinsics.

Tightly- and Loosely-coupled pallets, calling one pallet's functions from another pallet via trait specification.

Blockchain Consensus Mechansim, and a guide on customizing it to proof-of-work here.

Parachains: one key feature of Substrate is the capability of becoming a parachain for relay chains like Polkadot. You can develop your own application-specific logic in your chain and rely on the validator community of the relay chain to secure your network, instead of building another validator community yourself. Learn more with the following resources:

Terms clarification

  • Substrate: the blockchain development framework built for writing highly customized, domain-specific blockchains.
  • Polkadot: Polkadot is the relay chain blockchain, built with Substrate.
  • Kusama: Kusama is Polkadot's canary network, used to launch features before these features are launched on Polkadot. You could view it as a beta-network with real economic value where the state of the blockchain is never reset.
  • Web 3.0: is the decentralized internet ecosystem that, instead of apps being centrally stored in a few servers and managed by a sovereign party, it is an open, trustless, and permissionless network when apps are not controlled by a centralized entity.
  • Web3 Foundation: A foundation setup to support the development of decentralized web software protocols. Learn more about what they do on thier website.

Others


Author: substrate-developer-hub
Source Code: https://github.com/substrate-developer-hub/hackathon-knowledge-map
License: 

#blockchain #substrate