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== CSDUMMI ==
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I'm CSDUMMI (a.k.a. Joris Gutjahr). A software developer.

Hi

Hi, I thought I might want to service this blog a bit. During the last two months I’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’m returning home for the festivities. I don’t know what I’m doing next month, Babka will probably still have a lot of work to do. Read more...

My Experience

I’ve been working on computing since 2015. While the first language I tried was Python, the first language I understood was Java. I’ve since learned quite a few other procedural, object oriented and functional languages, such as C, JavaScript, Python, Haskell and Elm. I’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. Read more...

Mutating Secrets: A double spend resistent implementation with a trusted timestamping authority

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’ll go in to soon and being alerted to the existence of other (quite similar proposals) like Jessica Tallon’s idea for a pebble bank2. Read more...

Mutating Secrets digital Currency

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’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. Read more...

Ownership - an evolving and restricting term

I’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 “own”. And the term “own” and “ownership” have undewent some quite enormous mutations that I’ll go over to some degree in this article. Read more...
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