pissang

const echarts = require("echarts");
const Canvas = require('canvas');
const {JSDOM} = require('jsdom');
const fs = require('fs');
echarts.setCanvasCreator(() => {
    return new Canvas(100, 100);
});

const {window} = new JSDOM();
global.window = window;

chris-belcher

The Problem

JoinMarket has a problem where it assumes different nicknames have different bitcoin wallets. This can be exploited by people running multiple yield generator bots from the same wallet, so they get a higher rate of profit at the expense of de-legitimizing the system for privacy.

Crypto primitive 1: Merkle Tree

A merkle tree is a way of producing a commitment to a set, which can later can prove that elements are contained within the set using only O(logN) data, and only revealing one other element in the set.

For example here is a merkle tree commiting to a set of numbers {6, 3, 9, 0, 8, 4, 7, 2}

Icelandjack

Reddit discussion.

Disclaimer 1: Type classes are great but they are not the right tool for every job. Enjoy some balance and balance to your balance.

Disclaimer 2: I should tidy this up but probably won’t.

Disclaimer 3: Yeah called it, better to be realistic.

Type classes are a language of their own, this is an attempt to document features and give a name to them.

robmazan

function docker-compose() {
    if ($pwd.Path.StartsWith('C:\Users')) {
        $projectName = Split-Path "$pwd" -leaf
        $dockerPath = "/c" + $($($pwd -replace "^[a-z]:(.*)$",'$1') -replace "\\","/")
        $dockerCmd = "docker run -v $dockerPath" + ":/$dockerPath -w $dockerPath -v /var/run/docker.sock:/var/run/docker.sock -e COMPOSE_PROJECT_NAME=$projectName -ti --rm dduportal/docker-compose:latest $args"
        Write-Host $dockerCmd
        Invoke-Expression $dockerCmd
    } else {
        Write-Error 'You must be under C:\Users, otherwise fileshare to boot2docker will not work!'
    }

nkpart

{-# LANGUAGE NoMonomorphismRestriction #-}
{-# LANGUAGE TemplateHaskell           #-}
{-# OPTIONS_GHC -fwarn-missing-methods #-}
module Err where

import Control.Lens
import Control.Monad.Error
import Control.Monad.Error.Lens

-- Here is a fairly typical situation, where we have low level errors in certain

folone

Scalaz
Symbol	Code	Ascii	Example
η	951	pure	1.η[List]
μ	03BC	join	List(List(1,2,3), nil, List(5,6,7)) μ
∅	2205	zero	∅[Int]
<∅>		empty	<∅>[Option, Int]
∙	2219	contramap	((_:String).length ∙ (_:Int).toString ∙ ((_:Int) + 6))(5)
∘	2218	map	(((_:Int) + 6) ∘ (_:Int).toString ∘ (_:String).length)(5)
∘∘

"map2":https://github.com/scalaz/scalaz/blob/master/core/src/main/scala/scalaz/MA.scala#L326

sebastiaanvisser

{-# LANGUAGE GADTs, TypeOperators, TupleSections #-}
module Generics.Algebra where

import Control.Category
import Control.Arrow
import Control.Applicative
import Prelude hiding ((.), id)

import Generics.Combinator