My personal website
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<div class="page__content page__content--notitle"><p>Hi, I&rsquo;m CSDUMMI (a.k.a. Joris Gutjahr). I&rsquo;m a software developer.</p>
<p><a href="">Mastodon</a> <a href="">Email</a></p>
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<h1 class="entry__title title-excerpt"><a class="entry__title-link" href="/posts/time/">Mutating Secrets: A double spend resistent implementation with a trusted timestamping authority</a></h1>
<div class="entry__content">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.</div>
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<h1 class="entry__title title-excerpt"><a class="entry__title-link" href="/posts/cash/">Mutating Secrets digital Currency</a></h1>
<div class="entry__content">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.</div>
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<h1 class="entry__title title-excerpt"><a class="entry__title-link" href="/posts/ownership/">Ownership - an evolving and restricting term</a></h1>
<div class="entry__content">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.</div>
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