Engineering and technology notes

Nick Szabo

Nick Szabo is a computer scientist, legal scholar and cryptographer known for his research in digital contracts and digital currency. He graduated from the University of Washington in 1989 with a degree in computer science.[1]

The phrase and concept of “smart contracts” was developed by Szabo with the goal of bringing what he calls the “highly evolved” practices of contract law and practice to the design of electronic commerce protocols between strangers on the Internet.[2][3] Smart contracts are a major feature of cryptocurrency[4] and the programming language E.[5]

Szabo influentially[6] argued that a minimum granularity of micropayments is set by mental transaction costs.[7][8]

Source: Nick Szabo – Wikipedia

system installation – How to replace my disk without having to rebuild my Ubuntu install? – Ask Ubuntu

I’d like to buy a new 1TB disk to replace my old 150GB disk.
Is there an easy way to copy my Ubuntu installation with

  • my home folder content,
  • system settings,
  • applications,
  • and so on…

so at the end I can just unplug my old disk and plug the new one without having to re-install everything?

Source: system installation – How to replace my disk without having to rebuild my Ubuntu install? – Ask Ubuntu

virtualbox.org • View topic – [SOLVED] Duplicate UUID issue with vhd images

Firstly VirtualBox is simply fantastic. I’ve been using Parallels on OSX and it beats it hands down, even with less RAM.

I have a small issue. I’m using VirtualBox on Ubuntu and virtualising the VPC images made available by Microsoft here for browser testing purposes. http://www.microsoft.com/Downloads/details.aspx?FamilyID=21eabb90-958f-4b64-b5f1-73d0a413c8ef&displaylang=en

Everything works really well but if I try to add more than one of the XP images to the virtual media manager I get the following error.

Source: virtualbox.org • View topic – [SOLVED] Duplicate UUID issue with vhd images

Raspberry Pi • View topic – Multiple streaming mp3 radio stations

Hi –

I am looking for a way to generate multiple mp3 streams to icecast.

From my research, it seems that the most common way to generate one stream is mpd/icecast2 and that can support either mp3 or ogg format. It also seems that the most common way to generate multiple streams is ices2/icecast2 but that only supports ogg format.

I have a lot of mp3s – and I still intend to use them as mp3s. So at least for me personally, re-encoding all of them as ogg files is not an option. Storage space is cheap these days but the replication effort to keep things in sync would be a nightmare for me.

I’ve seen reference to the fact that ices streams mp3s but I’ve not been able to get it to compile – it seems likely that ices is so old that the package dependencies no longer align. Has anyone successfully compiled ices on Raspian or a Debian distro lately? Or does anyone have a suggestion of a different program to feed multiple streams to icecast2?

Source: Raspberry Pi • View topic – Multiple streaming mp3 radio stations

virtualbox.org • View topic – Minimalist OS to run VirtualBox and Launch VM

Hi Folks,
I browsed the forums topics, but can’t manage to find a simple answer to this question :

Does anyone know if there’s a pre-built package (ISO form), which includes VBox ?
I’d like to have a minimal core (let say a Linux kernel, with all necessary stacks (Network, USB, …), but without all unnecessary crap like heavy GDM). This minimal(ist) core, should be able to launch a fully functionnal VBox instance and let me choose which Virtual appliance I’d like to run.

I can build one from a basic Linux distro (for example, Dam small, LInux), but I fear to miss some important package to run VBox.

Any ideas someone ?

Source: virtualbox.org • View topic – Minimalist OS to run VirtualBox and Launch VM

How to implement Nat loopback/reflection? – Server Fault

I’m trying to access a server on my LAN via its public IP address. External clients can connect just fine, but I’m unable to do so from within the LAN. There is a separate rule in the NAT settings of my gateway (which translates subnet addresses to the public interface IP, but is otherwise identical), but it doesn’t appear to be working properly.How would I correctly set things up to access a local resource via a public IP address?

Source: How to implement Nat loopback/reflection? – Server Fault

Cannot access external IP address from LAN – ScreenConnect Online Help

Occasionally users cannot log into web based applications using a URL that contains their external IP address inside their network. This is typically a result of security measures put in place by routers/modems, and referred to as a NAT (Network Address Translation) Loopback issue or constraint. This article will discuss what this means for ScreenConnect users and available configuration options.

Source: Cannot access external IP address from LAN – ScreenConnect Online Help