An extended version of our drivers paper has been accepted at Concurrency and Computation: Practice and Experience, Wiley, 2020.
In this extended version we evaluate three more use cases. These analysis suggests that, similar to our previous paper, blockchain may not be the best technological choice. As such, choosing blockchain as a technology in these use cases seems like an irrational choice.
Our drivers may explain the rationality behind this seemingly irrational choice.
recent study that I did on blockchain use cases, I found that most use cases
focus on addressing a particular use case problem with blockchain. However,
what consistently was lacking was a discussion of potential threats that are
introduced when applying blockchain. From an empirical perspective, I also find
that in practice blockchain advocates tend to focus on addressing the use case
problem with blockchain, and the threats of blockchain are usually not
I’m a huge fan of blockchain and distributed ledger technology. However, I
believe these technologies should be applied where necessary; these technologies
should not be applied where possible. Applying these technologies where it
could be applied may introduce unnecessary threats.
Although several good surveys exist on the security and privacy threats of blockchain, see for example the work by Li et al. and Conti et al. , there is no survey of organizational risks.
In this white paper we survey potential organizational threats for use cases that adopt blockchain. We grouped the 22 threats in two categories, 1. Threats caused by human behavior, and 2. Threats caused by blockchain. Our survey complements the existing work on security and privacy threats of blockchain. These surveys can be used for the identification of blockchain risks in use case that (plan to) adopt blockchain.
Here’s a game I played with the black pieces (online) which show the importance of activity of one’s pieces, or, the consequences when there is a major lack of piece activity. In short, I sacrificed material to severely limit the activity of my opponent’s knight, bishop and rook. In the end, it all payed off, as almost all of his pieces were immobilized.
Bb3 the idea of trapping the bishop came to mind. But first finishing
we go. Sacrificing a pawn to immobilize the white squared bishop.
now white’s entire Queen side becomes passive. Look at the knight
on b1, it literally can’t go anywhere. The dark-squared bishop on
c1 and the rook on a1 are not active either. Ideally, I want a black
knight on a4, a black pawn on e4, and a black knight on d3, and those
white pieces will be burried alive.
immediately may have been better as a4 is white’s freeing move.
that’s black rook for a white knight. However, that knight (and
white’s Queen) are its only active pieces.
See my comment at move 13. Mission accomplished. I’m down in material (2 points), but white simply can’t use his Queen-side forces (11 points).
White resigned. None of his pieces (except for the king) can move.
Today (21-10-2019) I was challenged to a game of chess with the black pieces. Nothing special, as it happens 50% of the time. However, in this case I was blindfolded (literally) and the game was timed (9 minutes per person for the whole game).
My opponent told me his moves, and I told him mine. He moved both the white and black pieces, and handled the clock for both sides (pretty fair ;-)).
Here is how the game went:
Rad1 Qb4 – The Silicon Monster even likes white position. White has a lead in development, and the black king will be stuck in the center.
Rb1 too passive. 0-0
f3 -trying to complicate matters, but now the position is lost. exf3
Rh3 Bc5+ (I missed Qxf4, winning the bishop.)
Rxf6 Qxf6 – 1 minute on the clock!
Qh5 Qg6 – Missed a mated in one 🙂 Qf1++ Time pressure and being blindfolded don’t mix well.
Qd1 A final trick Rxd1++ Black sees it, it’s just mate.
Yes! Two more goals achieved. Single digit body fat (8%) and finished a photo-shoot.
After months of following a strict diet, cardio at 05:30 in the morning, and fitness training 5 times a week I was ready for the gruesome last week of photo-shoot prepping. Dropping caloric intake to max 1700 kcal (which used to be 5500 kcal max at some point last year) and very low in carbohydrates, this became a mental challenge due to the complete lack of energy.
The cheat meal the evening before the shoot was divine.
Thanks to Kenneth Nwosu who is an awesome photographer. He is able to make you feel more relaxed during the shoot, provides great advice, and the results are incredible. Follow Kenneth or have a look at his collection on instagram, twitter, or his website.
Thanks to everyone else who supported me during these last few weeks. Photos are available upon request.
Prepping for the shoot was a great experience, one I wouldn’t recommend to anyone 🙂
I’m happy because a third paper has been accepted for my PhD. A fourth is under review and two more are currently being written.
The accepted paper (my own version can be found here which is an improved version of this paper) is on Assessing Interoperability Solutions for Distributed Ledgers and will be published in Elsevier’s Journal Pervasive and Mobile Computing.
Now and then I play a quick game of chess against on my mobile phone. We all know that computers are much better at the game nowadays. I’m impressed by the way modern chess computers play, and here’s another example. However, now and then I manage to beat the computer (AI Factory), which has an estimated elo rating of around 2000. Here’s a nice example of me winning a chess game against a computer at max level, within 20 moves: