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March 2021. The days are longer, Covid shows the first signs of receding and Spring is coming. For the…

It’s been a bit over two years since I started Coder’s Errand. All this time, I’ve wondered how this…

Part of this series: Fungible and Non-Fungible Tokens in BlockchainsFungible Tokens in Ethereum: ERC-20Non-Fungible Tokens in Ethereum: ERC-721 I…

ECDSA in Ethereum Digital SignaturesDetails of ECDSA SignaturesECRecover and Signature Verification in EthereumECDSA Malleability In the previous posts in…

The Remote Work Experiment Discoveries about Working From HomeWhy I Preferred Office Working Once again, I turn to write…

The Remote Work Experiment Discoveries about Working From HomeWhy I Preferred the Office The coronavirus pandemic has forced me,…

Ethereum Digital Signatures Digital SignaturesDetails of ECDSA SignaturesECRecover and Signature Verification in EthereumECDSA Malleability As seen in the previous…

Ethereum Digital Signatures Digital SignaturesDetails of ECDSA SignaturesECRecover and Signature Verification in EthereumECDSA Malleability In the previous post in…

Ethereum Digital Signatures Digital SignaturesDetails of ECDSA SignaturesECRecover and Signature Verification in EthereumECDSA Malleability If you are a cryptographer,…

We are living through strange times. Hopefully, if you read this a few years from now, you won’t remember…

If you’re a software developer, or work in some intellectually demanding occupation, one that requires continued focus for a…

Event Topics Logging and Reporting EventsThe EVM’s Log OpcodesEvent Topics If you’ve read the previous post in this series,…

The EVM’s Log Opcodes Logging and Reporting EventsThe EVM’s Log OpcodesEvent Topics The previous post of this series introduced…

It’s the New Year, and many people around the world are now battling themselves to stay true to their…

Ethereum Apps with Web3.js How Do Ethereum Smart Contracts Work?Writing Smart Contracts in RemixSetting Up Truffle to Deploy Smart…

Truffle Console and Truffle Tests How Do Ethereum Smart Contracts Work?Writing Smart Contracts in RemixSetting Up Truffle to Deploy…

Setting Up Truffle to Deploy Smart Contracts How Do Ethereum Smart Contracts Work?Writing Smart Contracts in RemixSetting Up Truffle…

Writing Smart Contracts in Remix Posts in this series: How Do Ethereum Smart Contracts Work?Writing Smart Contracts in RemixSetting…

I started the Coder’s Errand in 2018. Part of the reason I did so was that I needed change,…

Posts in this series: The Case for zk-SNARKsThe Case Against zk-SNARKs Alternatives to zk-SNARKs I explored the strengths of…

Extension Fields Some time ago, I started a series on the algebraic structure behind ZK-Snarks. My focus was to…

These are interesting times we live in. This can, of course, be a good thing (exciting new opportunities) or…

In a previous post I explained how one can express a provable function for a ZK-SNARK in a Rank-1…

Elliptic Curves Previously I started peeling away at the different components that make a cryptographic pairing. I talked about…

Currently at Artos, we are researching ZK SNARKs in depth. One of the tasks we’re handling is to convert…

It is one year today since I started The Coder’s Errand and wrote my first post. Time, then, for…

In my experience, people smile when they hear the words Zero-Knowledge Proof . Maybe I did too, I don’t…

I have the rare privilege of being able to do research at work. Since my working life was half…

A few days ago, I was coding a small parser in C++ for a ZoKrates output file and hit…

In my previous post, I covered the essentials of how to convert between representations of a number in different…

Today’s post is a little different. It is not about Ethereum, Blockchain or anything remotely modern, but rather about…

When one starts coding smart contracts in Solidity, sooner or later, s/he will hit a very annoying obstacle. The…

In the last post, I made an introduction to the concept of Zero Knowledge Proofs, and talked a bit…

Since I started looking at the blockchain world, I saw the term ZK-SNARKs pop up here and there, but…

When one decides to start developing smart contracts, one of the things at the top of the list is…

In my previous post about Token-Bonding Curves, I showed that Bancor only allows 4 different types of curves. But…

There is a relatively new concept doing the rounds around the blockchain community, that of Token Bonding Curves. Although…

There are many occasions when we want to pass to a function a group of similar data that may,…

Following several days dedicated to probability distributions, the statistics tutorial then changes tack, and turns to correlation coefficients. A…

It feels like a long time since I started this blog, and until now it has been dedicated to…

Days 4 and 5 of the Statistics 10-day challenge (HackerRank) were dedicated to specific probability distributions. Day 6 builds…

In my last post about HackerRank, I left you with a cliffhanger: I covered the approach strategy, showing how…

When I started this blog, I purposely set myself two goals, with the expectation I would eventually decide between…

It has been more or less four weeks since I last wrote on this blog. One moon it is,…

This post focuses on days 4 and 5 of the “10 Days of Statistics” path in HackerRank, because they…

On this post, I go on with my trail through the HackerRank series “10 Days of Statistics”. After two…

Day 3 of the Statistics Tutorial in HackerRank was again devoted to  Statistics. In general, I felt the exercises…

There is a class of probability problems that I often see students struggling with. I think of them as…

In this post I solved three probability questions using the basic principle of discrete probability: find the ratio of…

Hello all, I’m back after a longer hiatus than I intended. After Easter, some things happened that took a…