Cristian Șerb cserb

Urkel Trees: An optimized and cryptographically provable key-value store for decentralized naming

Boyma Fahnbulleh (Handshake)

Merkle Trees are great, but can we do better?
Ethereum's Wish List on better Merkle Trees:
- Wanted a key-value store for the state
- Allow updates without having to reconstruct the entire tree
- Has bounded depth
- History independent: root hash doesn't depend on ordering among updates (i.e., commutative updates)

Merkle Patricia Tree is basically a fancy radix hash tree

Disclaimer: Please follow this guide being aware of the fact that I'm not an expert regarding the things outlined below, however I made my best attempt. A few people in IRC confirmed it worked for them and the results looked acceptable.

Attention: After following all the steps run gdk-pixbuf-query-loaders --update-cache as root, this prevents various gdk-related bugs that have been reported in the last few hours. Symptoms are varied, and for Cinnamon the DE fails to start entirely while for XFCE the icon theme seemingly can't be changed anymore etc.

Check the gist's comments for any further tips and instructions, especially if you are running into problems!

Screenshots

Results after following the guide as of 11.01.2017 13:08:

Learning FP the hard way: Experiences on the Elm language

by Ossi Hanhinen, @ohanhi

with the support of Futurice 💚.

Licensed under CC BY 4.0.

Editorial note

a simple git branching model

This is a very simple git workflow. It (and variants) is in use by many people. I settled on it after using it very effectively at Athena. GitHub does something similar; Zach Holman mentioned it in this talk.

	MARKDOWN = pandoc --standalone --from markdown+smart --to html --css theme.css

	all: $(patsubst %.md,%.html,$(wildcard *.md)) Makefile

	clean:
	rm -fv $(patsubst %.md,%.html,$(wildcard *.md))

	publish:
	aws-3.7 s3 sync . s3:/<BUCKET> --exclude "" --include ".html" --include

	! -----------------------------------------------------------------------------
	! File: gruvbox-dark.xresources
	! Description: Retro groove colorscheme generalized
	! Author: morhetz <[email protected]>
	! Source: https://github.com/morhetz/gruvbox-generalized
	! Last Modified: 6 Sep 2014
	! -----------------------------------------------------------------------------

	! hard contrast: *background: #1d2021
	!*background: #1d2021

	Xft.dpi: 120
	Xft.antialias: true
	Xft.hinting: true
	Xft.rgba: rgb
	Xft.hintstyle: hintslight

	! hightlight - #268BD2
	! normal - #ffffff
	rofi.color-enabled: true
	rofi.color-window: #282a36, #282a36, #6272a4

	" Ctrl-p behaviour {{{
	nnoremap <Leader><Leader> :Unite -start-insert file_rec/async<CR>

	call unite#filters#matcher_default#use(['matcher_fuzzy'])
	call unite#filters#sorter_default#use(['sorter_reverse'])
	call unite#custom#source('file_mru,file_rec,file_rec/async,grep,locate',
	\ 'ignore_pattern', join(['\.git/', 'tmp/', 'bundle/'], '\\|'))

	let g:unite_prompt = '>>> '
	let g:unite_winheight = 15