Menu

Show posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Show posts Menu

Topics - koeppelmann

#1
Outside Work / Master thesis on truthcoin?
September 15, 2014, 06:07:35 PM
I am currently looking for a topic for my master thesis. I finished the taught part of the Master of "IT Systems Engineering" at the Hasso Plattner Institute at the University of Potsdam two years ago. I subsequently worked on startups and founded Fairlay (Bitcoin prediction market). At our institute we do not have a research group that would lend itself to a thesis on truthcoin. However, if I were to find a co-advisor I could submit it at my university, and spend a lot time on the engineering and development of truthcoin. I have done a lot of work with python (e.g. programmed a poker bot and Fairlay) I could step in and work on zacks implementation. Do any of you know of a suitable advisor (must have PhD and work at a university).
#2
As far as I understood: the valid blockchain is the blockchain where the most POW AND the most votes are put in.

from the paper: there is the timeline
5) Market Matures – votes are encrypted in the blockchain
6) Votes Decrypted – private keys are revealed

What an miner attacker with 51% could do: after the private keys are revealed: build up a new blockchain. Start in the latest block of phase 5) update all votes with the revealed private keys, (change votes to whatever he want - but more important transfer votecoins to own addresses)
Now he can build up a higher blockchain since it could have ALL VOTES and MORE HASHRATE

Did I overlook something?
#3
I question your assumption that it is not possible for voters to make provable public what they have voted for without loosing control of the coins.

You argue that users encrypt their votes and release the private key only when all votes are placed - since otherwise someone else could control the vote (the TRU?)

However, as far as I understood the timeframe for placing a vote is in the range of days while the timeframe for a block creation is more like 10 minutes (??). Now - when my vote is in the blockchain (together with a (not encrypted) transaction to a different address, right?) what prevents me from publishing the private key?

#4
Outside Work / Fairlay
August 21, 2014, 08:25:06 PM
Hi,

I am the co-Founder of Fairlay.com a yet still centralized prediction market.
However, we started working on the site (little bit more then a year ago) because we are obsessed by PMs and blockchain tech. Our approach has been to set something up running and we will decentralize the underlying mechanics (money storage, order book, resolution) step by step.

Thus we follow everything what is happening in this space and will use services as soon they could replace a part of our site. (like realitykeys, multi-sigsolutions,...)

A presentation about the current state (from our view) of decentralized PMs is given here:
https://www.youtube.com/watch?v=hZO1JQtMang
I don't think that it contains really new stuff for member of this board...

If truthcoin would exist we would not hesitate to build on it.


Our general status - we have around 1700 registered users (even if it is not necessary to register). We had the most prediction volume during the last 2 weeks of the FIFA World Cup even if we build our site with mainly predictions on politics and Bitcoin related events in mind. We all know that a betting exchange like betfair or a PM like intrade have the same underlying mechanism but they still attract different user. In the end user used to sport betting still found it easier.

That been said - from our experience so far our main obstacle is user not understanding the site and not being not decentralized.