achow101

Using Bitcoin Core with Hardware Wallets

This approach is fairly manual, requires the command line, and requires a patched version of Bitcoin Core.

Note: For this guide, code lines prefixed with $ means that the command is typed in the terminal. Lines without $ are output of the commands.

Disclaimer

I am not liable for any coins that may be lost through this method. The software mentioned may have bugs. Use at your own risk.

fernandonm

Trust-minimized derivatives

Options contracts can be implemented as trust-minimized smart contracts using Bitcoin script. These contracts don't require oracles feeding the price into the blockchain or any other trusted third party. Recipients will only trust miners to mine (and not reverse) transactions paying a reasonable feerate, securing their payouts.

The underlier of these derivatives can be any digital asset available on a blockchain that can do HLTCs.

Call options

The buyer of an American-style call binary option pays a premium (eg: 0.1 BTC) for <seller secret> wich gives the right to buy Q units (quantity) of the underlying asset (100 LTC) at a specified strike price (0.016 BTC per LTC) at any time until the expiration date.

maxivak

Sending emails with ActionMailer and Sidekiq

Send email asynchroniously using Sidekiq.

ActionMailer

Create your mailer us usual:

spoike

var PostsApi = require('webapi/posts'), 
        // assuming the api object from the jsbin snippet
    Reflux = require('reflux');

var PostActions = createActions(["load", "loadError"]);
        // load action is invoked either from:
        // * top most component's componentDidMount 
        //   function in your application, or
        // * window.onLoad
        // I prefer the first strategy because that'll

gavinandresen

O(1) Block Propagation

The problem

Bitcoin miners want their newly-found blocks to propagate across the network as quickly as possible, because every millisecond of delay increases the chances that another block, found at about the same time, wins the "block race."

dionyziz

A pseudonymous trust system for a decentralized anonymous marketplace

Dionysis Zindros, National Technical University of Athens [email protected]

Keywords

pseudonymous anonymous web-of-trust identity trust bitcoin namecoin proof-of-burn timelock decentralized anonymous marketplace openbazaar

Abstract

rthbound

require "usno/imagery"

require "open-uri"
require "RMagick"
include Magick

def animate(n,f)
  i=0
  time = Time.now

julionc

How to install PhantomJS on Ubuntu

Version: 1.9.8

Platform: x86_64

First, install or update to the latest system software.

sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev

hmans

doctype html
html
  head
    title My App
    meta name="viewport" content="width=device-width, initial-scale=1.0"
    = stylesheet_link_tag    "application", media: 'all', 'data-turbolinks-track' => true
    = javascript_include_tag "application", 'data-turbolinks-track' => true
    = csrf_meta_tags

  body

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048