sandfox

No, your cryptocurrency cannot work

Whenever the topic of Bitcoin's energy usage comes up, there's always a flood of hastily-constructed comments by people claiming that their favourite cryptocurrency isn't like Bitcoin, that their favourite cryptocurrency is energy-efficient and scalable and whatnot.

They're wrong, and are quite possibly trying to scam you. Let's look at why.

What is a cryptocurrency anyway?

There are plenty of intricate and complex articles trying to convince you that cryptocurrencies are the future. They usually heavily use jargon and vague terms, make vague promises, and generally give you a sense that there must be something there, but you always come away from them more confused than you were before.

parts requests

3 raspberry pi zeros
k3s - lightweight k8s for IoT/ARM
~~wireguard~~ tailscale mesh vpn

Back To The Basics

Chapter 1: Using Flow

Introduction

Why does it make sense to use FlowType or TypeScript when working with JavaScript? A good approach in answering this question is to build a small game or application to make the benefits clear.

AWS Lambda@Edge Experiment

Requirements

AWS Lambda@Edge (enabled Preview)
One Amazon CloudFront Distribution (origin doesn't matter)
IAM role (basic execution is enough)
npm to install Node.js dependencies

Why we dropped Lerna from PouchDB

We dropped Lerna from our monorepo architecture in PouchDB 6.0.0. I got a question about this from @reconbot, so I thought I'd explain our reasoning.

First off, I don't want this post to be read as "Lerna sucks, don't use Lerna." We started out using Lerna, but eventually outgrew it because we wrote our own custom thing. Lerna is still a great idea if you're getting started with monorepos (monorepi?).

Backstory:

https://pouchdb.com/2016/01/13/pouchdb-5.2.0-a-better-build-system-with-rollup.html

This document has moved!

It's now here, in The Programmer's Compendium. The content is the same as before, but being part of the compendium means that it's actively maintained.

	#!/bin/sh
	#
	# Script that will use the provided Android App Bundle (.aab) and change its version code and version name to the provided values, avoiding re-building the whole .aab.
	# Run this script with: sh rollback.sh your_project.aab android_signing_key.key key_alias key_pwd version_code version_name
	#
	# Necessary setup:
	#
	# jarsigner - This binary should exist in the path
	#
	# Configuration.proto and Resources.proto can be found in aapt2's github

	export class MyEcsConstructStack extends cdk.Stack {
	constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
	super(scope, id, props);

	const vpc = new ec2.VpcNetwork(this, 'MyVpc', {
	maxAZs: 3 // Default is all AZs in region
	});

	const cluster = new ecs.Cluster(this, 'MyCluster', {
	vpc: vpc

	# Put in your ~/.ssh/config

	### Problem
	#
	# You are on a public WiFi network that blocks SSH ports but you don't want to switch
	# to pushing your Github changes to GH remotes via HTTPS nor do you want to change the
	# remote hostname in all your repos.

	Host github.com
	Hostname ssh.github.com