Lewin Kelly Heliodex

Ford Fusion

Overview and Rationale

Ford Fusion was an overhaul of Urbit's over-the-air upgrade process and a rewrite of its build system. The new update system corrects a few long-standing bugs with the previous one, and the new build system is simpler, smaller (by around 5,000 lines), and easier to manage.

Since deployment of Ford Fusion to the livenet in late June, over-the-air updates (OTAs) have been much smoother. Before Ford Fusion, it was common for an OTA to take several hours, use too much memory, and leave ships in inconsistent states. After Ford Fusion, multiple OTAs have been pushed out, including kernelspace changes, and most users didn't even notice.

Urbit has always been able to update itself OTA, but this process has often been rocky. Updating an operating system kernel on-the-fly is a difficult problem in general, like performing heart replacement surgery on yourself while running a marathon. Code that allows Linux to update its kernel in this way became a startup called Ksplice, won

Boolean() or !! (double bang, double negation)?

What's the best way to answer the question "true or false?" in JavaScript

JavaScript does not bother you too much with types (at first), which is both a blessing and a cure. But we all know the Boolean type. Boolean variables can either be true or false. Yes or no.

Every value in JavaScript can be translated into a boolean, true or false. Values that translate to true are truthy, values that translate to false are falsy. Simple.

This is about two ways to make that translation.

Introduction

I'm Ruben Somsen, Bitcoin Sorcerer. I do protocol design in order to enhance Bitcoin.

I'm sponsored by Spiral, Superlunar/Gemini, HRF, and am currently working on Silent Payments with Josie and assisting Davidson with the implementation of Proof-of-Work fraud proofs into Floresta.

I also help maintain the bitcoin-dev mailing list, am a BIP editor, co-hosted the Unhashed Podcast, founded the Seoul Bitcoin Meetup in 2014, actively co-organizing BitDevs Amsterdam, and on the layer two funding sub-committee of OpenSats.

You can find me on Twitter, Mastodon, and Telegram. You can also join [this Te

Blind Merged Mining with covenants ( sighash_anyprevout / op_ctv )

Update: the content of this gist is also explained in this Spacechains video.

This write-up was also published on bitcoin-dev.

Blind Merged Mining (BMM) is the idea of committing the hash of another blockchain into a unique location on the Bitcoin blockchain, and paying a Bitcoin fee to miners for the privilege of deciding this hash and capturing the fees inside the other blockchain. Since miners don’t have to know what the hash represents and are simply incentivized to choose the highest bidder, it requires no extra validation on their part (“blind”). This idea was originally conceived of by Paul Sztorc, but required a specific soft fork. [0]

In essence, BMM is a mechanism that allows external blockchains (altcoins, tokens) to outsource their mining to the Bitcoin blockchain. Instead of burning electricity with ASICs, th

Compress

tar cf - <files> -P | pv -s $(du -sb <files> | awk '{print $1}') | gzip > <some .tar.gz file>

where:

`` is the root-mounted (i.e. starts with /) path to the files

Mastodon Docker Setup

Setting up

Clone Mastodon's repository.

# Clone mastodon to ~/live directory
git clone https://github.com/tootsuite/mastodon.git live
# Change directory to ~/live

cd ~/live

How to write an awesome-wm config with Fennel

Awesome-WM is a X11 window manager, that is configured via Lua. Fennel is a Lisp for Lua. This shows a general setup of how to write your awesome-wm config using fennel directly without the compilation step (which would also work, but is not needed).

General setup

Fetch a recent Fennel version (the


	const fs = require('fs')
	const Arweave = require('arweave/node')
	const argv = require('yargs').argv

	const arweave = Arweave.init({
	host: argv.arweaveHost ? argv.arweaveHost : 'arweave.net',
	port: argv.arweavePort ? argv.arweavePort : 443,
	protocol: argv.arweaveProtocol ? argv.arweaveProtocol : 'https'
	})

	const toBoolean = (context: any, flags: string[]) => {
	for (const flag of flags) {

	const propValue = context[flag];
	const propType = typeof propValue;

	if ('boolean' === propType) {
	context[flag] = propValue;
	}

	#!/bin/bash

	# Just a simple wrapper to start bitcoind.
	#
	# If using systemd, simply create a file (e.g. /etc/systemd/system/bitcoind.service)
	# from example file below and add this script in ExecStart.
	# https://raw.521000.best-/bitcoin/bitcoin/76deb30550b2492f9c8d9f0302da32025166e0c5/contrib/init/bitcoind.service
	#
	# Then run following to always start:
	# systemctl enable bitcoind