My personal website
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=============<br>
== <a href="http://jorisgutjahr.eu/">CSDUMMI</a> ==<br>
=============
<div style="float: right;">I&#39;m CSDUMMI (a.k.a. Joris Gutjahr). A software developer.</div><br>
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<a href="/"><b>Start</b></a>.
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<h1><a href="http://jorisgutjahr.eu/en/posts/hi/">Hi</a></h1>
<b><time>2022-11-27 00:00:00</time></b>
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Hi, I thought I might want to service this blog a bit.
During the last two months I&rsquo;ve been doing improvised work-and-travel across Europe. I got myself an Interrail pass for 2 months with 15 travel days and I got, through accident or random encounter, a remote job working with Serge on Babka.
By now my journey is coming to an end and I&rsquo;m returning home for the festivities. I don&rsquo;t know what I&rsquo;m doing next month, Babka will probably still have a lot of work to do.
<a href="http://jorisgutjahr.eu/en/posts/hi/">Read more...</a>
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<h1><a href="http://jorisgutjahr.eu/en/posts/experience/">My Experience</a></h1>
<b><time>2022-11-25 00:00:00</time></b>
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I&rsquo;ve been working on computing since 2015. While the first language I tried was Python, the first language I understood was Java.
I&rsquo;ve since learned quite a few other procedural, object oriented and functional languages, such as C, JavaScript, Python, Haskell and Elm.
I&rsquo;ve consistently published my projects, small and large, on GitHub, GitLab and most recently also on Codeberg. On all of these platforms I use the alias CSDUMMI consistently.
<a href="http://jorisgutjahr.eu/en/posts/experience/">Read more...</a>
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<h1><a href="http://jorisgutjahr.eu/en/posts/time/">Mutating Secrets: A double spend resistent implementation with a trusted timestamping authority</a></h1>
<b><time>2022-01-04 00:00:00</time></b>
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I have to thank the Fediverse before writing up another post on this subject. The kind of discussions I took part in during the last few days, were fascinating and I cannot imagine that they would have happened so constructively and with similar civility on another network.1.
During these discussions I was able to detail my idea for a mutating secrets based currency more clearly, while being raised to an issue I&rsquo;ll go in to soon and being alerted to the existence of other (quite similar proposals) like Jessica Tallon&rsquo;s idea for a pebble bank2.
<a href="http://jorisgutjahr.eu/en/posts/time/">Read more...</a>
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<h1><a href="http://jorisgutjahr.eu/en/posts/cash/">Mutating Secrets digital Currency</a></h1>
<b><time>2022-01-01 00:00:00</time></b>
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More Environmental, Accessible and Private Digital Cash Imagine I wanted to develop a secrets based digital currency. A naive implementation of such a currency would represent a coin by some secret and to own a coin somebody&rsquo;d have to know that secret.
Transfering a coin would be done by sending the secret to another person through a secure channel.
But this system has an obvious problem: the previous owner of a coin never forgets the secret and they can always transfer the coin again to other people thus spending the coin twice.
<a href="http://jorisgutjahr.eu/en/posts/cash/">Read more...</a>
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<h1><a href="http://jorisgutjahr.eu/en/posts/ownership/">Ownership - an evolving and restricting term</a></h1>
<b><time>2022-01-01 00:00:00</time></b>
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I&rsquo;m writing this document on a device that I own. I own this device in the sense, that I have exclusive control to do with this device as I see fit - as long as I do not violate an existing law.
This is a very old but not the oldest definition of the word &ldquo;own&rdquo;. And the term &ldquo;own&rdquo; and &ldquo;ownership&rdquo; have undewent some quite enormous mutations that I&rsquo;ll go over to some degree in this article.
<a href="http://jorisgutjahr.eu/en/posts/ownership/">Read more...</a>
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<a href="https://social.jorisgutjahr.eu/@csdummi"><b>Mastodon</b></a>.
<a href="https://codeberg.org/CSDUMMI"><b>Codeberg</b></a>.
<a href="https://gitlab.com/CSDUMMI"><b>GitLab</b></a>.
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