[33c3 prelude music]
Okay, then let's continue with the next talk.
It's from vimja. He is from Bern.
He studies computer science and deals with Bitcoin and Ethereum.
He wrote his bachelor thesis
on Bitcoin. So he will present us
an introduction to Blockchain.
A big applause for vimja!
[applause] The stage is yours!
[applause]
vimja: Gret, that just broke down.
[laughter]
Now that's better.
[applause] Thank you!
Okay, of course that doesn't work, too.
Then I'll do it by hand.
It's probably because you consume all the wi-fi.
So the herald told you everything already.
While studying blockchain,
I could learn many interesting things,
and I want to share a part of this knowledge
with you this evening.
This is of course a very complex topic.
So let's start with somethig easy, something we all know.
To be specific: conventional systems of ownership.
They express who owns something.
These systems of ownership can be displayed as systems of transitions.
That's true for financial systems
and for real estate systems
expressing ownership of land.
The mapping consists of the collection of owners and their possesions.
And every shift of ownership
is a transition, that leads to a new steady state.
Concerning the financial system, the state is
the collection of all the bank accounts.
And the transitions are between accounts,
for example transfering money.
That leads to a new state. We see this here
with real estate as an example. This state contains the information
of ownership for every piece of land.
Then Bob sells Alice piece of land Nr. 42, that leads to a new state.
I marked the difference to make it clear.
It is important in all these systems that all participants
agree on who owns what.
Because, if they can't, there could be attacks at the system.