Cat McGee

@catmcgee

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i write about blockchain dev, zk, and other things

IrelandJoined September 2021

About

I'm Cat! I'm a software developer and advocate for the decentralized web

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Cat McGee's blogs

Cat McGee - Web3, blockchain, and controversial takesblog.mcgee.cat7 posts

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Recently published

CMCat McGeeblog.mcgee.catAug 12, 2025 · 15 min read

How to use Passkeys in Next.js using WebAuthn

In this tutorial, we will learn how to use SimpleWebAuthn to allow users to register and login with passkeys in a Next.js app. It assumes you have basic knowledge of Typescript and Next.js. We’ll be building this (live demo). If you’d rather dive hea...

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CMCat McGeeblog.mcgee.catNov 5, 2021 · 6 min read

Blockchain's biggest technical challenge

Blockchain is awesome. The perfect immutable peer-to-peer network leading the way into web3. But, as with any technological breakthrough, it has its issues. There is one big problem with blockchain, often called the 'trilemma.' According to my spell-...

3

URT

CMCat McGeeblog.mcgee.catOct 1, 2021 · 9 min read

How to make your very own cryptocurrency (deploy your first smart contract!)

Ever thought about making your own crypto? Now you can, and it's way easier than you think. This tutorial is going to teach you how to write and deploy a smart contract on Ethereum, and that smart contract will contain all the rules of your token. By...

5

CJD

CMCat McGeeblog.mcgee.catSep 28, 2021 · 8 min read

Why web3 matters

Recently, a Twitter thread entitled Why web3 matters went viral. And as much as I love this sentiment, I couldn't help but roll my eyes when reading through Chris Dixon's buzzword-filled tweets. That kind of blockchain lingo is loved by crypto salesp...

17

RATWA

CMCat McGeeblog.mcgee.catJul 28, 2020 · 4 min read

Code anything in JavaScript, with only 8 characters

You can convert any Javascript code into these characters: ()[]{}!+ and only these characters. Here's how: Numbers We can get 0 by casting an empty array using +[]. The + is the unary plus, which converts the right side into a numeric value, i.e. 0, ...

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Cat McGee

About

Available for

Cat McGee's blogs

Recently published

How to use Passkeys in Next.js using WebAuthn

Blockchain's biggest technical challenge

How to make your very own cryptocurrency (deploy your first smart contract!)

Why web3 matters

Code anything in JavaScript, with only 8 characters

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Cat McGee

About

Available for

Cat McGee's blogs

Recently published

How to use Passkeys in Next.js using WebAuthn

Blockchain's biggest technical challenge

How to make your very own cryptocurrency (deploy your first smart contract!)

Why web3 matters

Code anything in JavaScript, with only 8 characters