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BlockOnAir #2: Interview with Zeedz.io (NFT Game | Hiring)

BlockOnAir #2: Interview with Zeedz.io (NFT Game | Hiring)

Reduce the global carbon emissions by playing a Blockchain based game? 👀 Watch the full interview here: The Story? 📝 Imagine, the Evil Lord C.O. the 2. of the Disposable Islands has declared war

  • Thomas Wiesner
    Thomas Wiesner
2 min read
BlockOnAir #1
blockOnAir

BlockOnAir #1

Hey! Welcome to this first edition of Block On Air, where we share technical-focused insights for you and everyone interested in the blockchain space. As this is a fast paced and ever changing

  • Thomas Wiesner
    Thomas Wiesner
2 min read
Cancel or Update Pending Ethereum Transactions

Cancel or Update Pending Ethereum Transactions

In this video I'll show you how you can "unstuck" your pending Transactions on Ethereum. Did you know? You can update Ethereum transactions or cancel Transactions altogether. You can do it from MetaMask

  • Thomas Wiesner
    Thomas Wiesner
1 min read
Smart Contract Upgrades and Proxy Patterns
ethereum

Smart Contract Upgrades and Proxy Patterns

In this video you will learn about all available methods to upgrade Smart Contracts. We are gradually going from logic/storage separation over Proxy patterns to most sophisticated techniques to exchange Smart Contracts

  • Thomas Wiesner
    Thomas Wiesner
1 min read
Uniswap v2 (as a Developer)
tutorial

Uniswap v2 (as a Developer)

IntroductionUniswap is a platform (or protocol) on Ethereum to swap either Tokens<->Ether (V1) or Tokens<->Tokens (V2). But how does Uniswap work as an integration to

  • Thomas Wiesner
    Thomas Wiesner
14 min read
Dashboards for Ethereum Monitoring
ethereum

Dashboards for Ethereum Monitoring

So you built your decentralized Application. But then? Of course, you need to monitor it. Because always manage the money at risk and that includes proper monitoring. There are a few resources out

  • Thomas Wiesner
    Thomas Wiesner
2 min read
Solidity 0.6.4 and call{value: ...}() instead of call.value()()
solidity

Solidity 0.6.4 and call{value: ...}() instead of call.value()()

Solidity 0.6.4 deprecated something which almost slipped my attention. address.call.value()() was deprecated and got replaced with address.call{value: x}(). Let's check out how this works. When I saw

  • Thomas Wiesner
    Thomas Wiesner
3 min read
Hosting Containers with AWS ECS at Scale

Hosting Containers with AWS ECS at Scale

In mid 2019 I started to look for Enterprise-grade hosting solutions. Why? Because we already work with Docker and Git in our teams. So, the next step was to see if we can

  • Thomas Wiesner
    Thomas Wiesner
3 min read
Solidity 0.6.0 Breaking Changes Hands-On Video Walk-Through
solidity

Solidity 0.6.0 Breaking Changes Hands-On Video Walk-Through

So, you heard the news: Solidity 0.6.0 is out. And it got some breaking changes! In this post & attached video I want to go through some of the changes hands-on.

  • Thomas Wiesner
    Thomas Wiesner
6 min read
ThinkPad T495s - Developers Review
expat

ThinkPad T495s - Developers Review

Today a post from my life instead of Blockchains. I bought a new Laptop. I was thinking about it for quite a while and the timing seemed just right, as my old one

  • Thomas Wiesner
    Thomas Wiesner
5 min read
Ethereum Blockchain Quiz - 5 Questions You Should Know (Hard!)
ethereum

Ethereum Blockchain Quiz - 5 Questions You Should Know (Hard!)

Do you really know Ethereum well? Today I got 5 questions every Ethereum Blockchain Developer should know. Some are super easy, some are quite hard, none of them should feel unfamiliar. Watch the

  • Thomas Wiesner
    Thomas Wiesner
3 min read
Local Development vs. Virtual Box and Vagrant vs. Container like Docker or Kubernetes
programming

Local Development vs. Virtual Box and Vagrant vs. Container like Docker or Kubernetes

In this post I am comparing three things: 1. local (web) development, 2. classical virtualization using Hypervisors such as Virtual Box, 3. containerization and orchestration tools such as LXC, Docker, docker-compose, docker-swarm and

  • Thomas Wiesner
    Thomas Wiesner
19 min read
4 Things about Enterprise Blockchain Development. Get ready (for 2020)!
blockchain

4 Things about Enterprise Blockchain Development. Get ready (for 2020)!

Today I want to talk about 4 things you didn't know about Blockchains, Hyperledger, Ethereum and general Smart Contract Development. In this video I will show you how to setup Hyperledger Besu on

  • Thomas Wiesner
    Thomas Wiesner
10 min read
Is it worth becoming Blockchain Developer in 2020?
blockchain

Is it worth becoming Blockchain Developer in 2020?

Is developer demand raising or falling? What's the cost of Blockchain education? What's the average salary for a Blockchain developer? How long will it take to become a successful Blockchain Developer? ... and many more! Let's get into it.

  • Thomas Wiesner
    Thomas Wiesner
20 min read
Learn Docker and Docker-Compose 100% Hands-On
course

Learn Docker and Docker-Compose 100% Hands-On

Beginning of 2019 I got frustrated. I used Vagrant and the ScotchBox for Web-Development. But it was hard to switch to new PHP or MySQL versions. It was hard to get the whole

  • Thomas Wiesner
    Thomas Wiesner
3 min read

Why a .send() transaction can fail

We already covered the difference between .send() and .transfer() in another blog post. But now, someone in our Udemy courses asked the great question: "How can a .send() transaction fail"? Send

  • Thomas Wiesner
    Thomas Wiesner
2 min read

Ethereum Accounts, Addresses, Private and Public Keys

In this post I'm going to tell you what exactly an account on the Ethereum Blockchain is. We are also talking about how an address is really created internally. And what the private

  • Thomas Wiesner
    Thomas Wiesner
2 min read

What is ... ? Ethereum Frequent Terms and Concepts explained!

What's an ABI Array? What's the Account Nonce? What's the difference between Ether and Ethereum? This and many more questions explained!

  • Thomas Wiesner
    Thomas Wiesner
4 min read
blockchain

What's the difference between JavaScript, Solidity, Ethereum and Chaincode?

This is a question someone asked recently. And right so! To the seasoned eye it looks like a mix of different technologies just randomly mixed together. For beginners it's extremely hard to keep

  • Thomas Wiesner
    Thomas Wiesner
2 min read
How To Return A Mapping In Solidity and Web3?

How To Return A Mapping In Solidity and Web3?

Someone in our Facebook Group asked how to return a Mapping in Solidity. It's not possible. But can you eventually return a struct with a mapping? Would that work? I will give you

  • Thomas Wiesner
    Thomas Wiesner
2 min read
Blockchain & Education
blockchain

Blockchain & Education

Blockchain Technology and the Education System Education is one of the key areas of focus in most developed countries as advancement in other sector hinges on the level of education. Regardless of the

  • Thomas Wiesner
    Thomas Wiesner
9 min read
Facebook and the Crypto-World
blockchain

Facebook and the Crypto-World

So, Facebooks Crypto-Ads are back. You've probably heard it. And Bitcoin made a jump as well, which hopefull didn't surprise anyone. I've long said that Mark is building his own Blockchain Empire. Facebook

  • Thomas Wiesner
    Thomas Wiesner
1 min read
Why Blockchain Is Insurance Disruption
blockchain

Why Blockchain Is Insurance Disruption

A few days ago I asked how blockchain technology can help reduce the cost for insurance settlment and other overhead costs. How much are the settlement costs? The answer, how blockchain disrupts the

  • Thomas Wiesner
    Thomas Wiesner
11 min read
The Proof that Censorship-Free is WISHFUL Thinking and NOTHING else!

The Proof that Censorship-Free is WISHFUL Thinking and NOTHING else!

It took 11 posts until he wanted to delete something.. New Record! Lucky for him, it was so early. His new dApp was just released on the Rinkeby-Testnet. A simple Discussion-Board. A Sample-dApp,

  • Thomas Wiesner
    Thomas Wiesner
2 min read
Amazon Accepts CRYPTO Payments via Moon
bitcoin

Amazon Accepts CRYPTO Payments via Moon

Isn't that amazing? You can take your crypto and spend it on real-world items. You can go on a shopping spree on Amazon. I did. I tried and failed. It's actually pretty straight

  • Thomas Wiesner
    Thomas Wiesner
2 min read
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