[Applause]
now see some to doodle says good boy he
wants to try to do some programming work
with you together in the begin to my
adversity I'm Jeff Brooks from
sloppiness science Roget and today we
want to talk with you about into our
injured protocol and steer with a will
perfect a to try to shoot which is the
small smallest clients for determine
other projects business in this type
available and today I will give you a
short introduction how the system grows
and then we will have time to do some we
are programming together assignment he
will show something then you can also
practice it on your own do to learn and
try out assistant
to be pretty helpful there or traveling
if you want to participate live it's
good to have some software available the
easy thing would be to use a double
match you know the internet is not stats
create here so I have some sticks so if
you want to install a double each time a
computer you can just take one of these
sticks
there's the cooking image or you can
download it directly okay
[Music]
but what we are doing today so in the
first I want to talk about what it is
how it works what are the benefits are
the boundaries and then we reduce on
from training different platforms power
to integrate into the client and our
second topic we will go a bit more in
detail how to push we are using to
understand of the sake and programming
work how we can how these proofs are
cooking how they can do it myself and in
the end we will show how to install into
the nodes that means node which connects
to which provides services for them okay
first I will I want to introduce your
how does it work
so this when you see this is the vision
everyone heads in the beginning teacher
water fortunes were constructed we have
a decent decent price network with nodes
which are connected directly in their
apps which interact with these clients
and accessed information of the table
Jenny who thinks that this is the
configuration which is growing at the
moment in the moment it looks mostly
like this
we have this nice decent Westnet program
but most of the depths by accessing the
information of the Trojan War II sent by
suppose these sentences are very
important for the time now to put these
apps but when you think to the future we
need decentralized way to access the
division for option so when we talk
about clients then if different types of
time so dinners for example the term for
other opportunities almost the same we
have these full notes or even archive
notes which are very big in a lot of
resources and then even if we have a
food per note its way to pick to run it
in a browser or on an int device and
even though times are way too big to run
but I achieve the rifle sense so the
minimum configuration for a right time
is a computer in the size of Grass
Valley but most of IT devices are way
smaller
so when we designed the system we had
something like this you cannot see it
much because this is a small microphone
this is my total which is written in the
dual devices and of course such
magnitude is not able to run and I tried
that and what are doing the most tell
you something more clients meaning they
have asked the roads money in the
internet and they have a remote of
expertise but with this approach the
owners disinterested want to be rely
upon said last note and we are seeing a
point of failure you don't know if he
asked maybe attack
so our solution our approach is the
imputed client richness so he wants to
have the abilities by plant the security
by plant but this one's the easiness of
remote management
I will now explain how this system works
before I thought this now impute we are
able to hear the complete decentralized
system it means we have deaf speech run
such a tribute time and these clients
are connecting through decentralized
network of such even thoughts which are
awesome goods of the decent life circle
of the blockchain so I want I will use
the term minimum magnification kind
several times decide I want to give you
a short definition what we mean with I
said so this is the client which is able
to and gratified information it receives
and to validate that this vision video
belong to project and then it's very
small client means only a small amount
of sources as only obviously publication
ends which is all the interesting part
of the concern it does not depend on a
special project of course we did is for
children because we are coming from the
third world but it can grow the same
and the very important thing is that
this client is a stateless client that
means to no time it needs to synchronize
with the information of the object only
but we need information we can connect
to this network and then it gets
information and if you don't need
innovation you don't either pure life
for the center of their in tube system
is the future registry that means we
have someone's this all footnotes maybe
archive notes with additional piece of
software the include notes of them and
these notes register to a smart contract
I guess the contract they give the
deficit security person I will explain
later by Benitez and give some
information
so then Dix lines they can get this list
and with this list they know which notes
belong to the network and then they can
interact
so and how does it work let's start with
one client and this client has this list
of positive notes so in this list is the
newest outward XS this node it knows the
securely deficit and this head has kind
of the rotation system so for instance
if the throws of a this road is not
answering
then it will be blacklisted or in some
way so then now the client needs
information it can excesses list when
selects one of these nodes in this case
it's an ex-world beam and since
obviously request for I want to know for
instance if I have access to this able
to disprove and it receives the answer
yes what about the answers so this is
the same thing like a word client would
receive but additional to this we
proceed with broker food for this
information and we receive to Proctor so
in 50s information declined but itself
can validate okay this information I
received belongs to this partner but so
at this point we don't know if would be
maybe did send us a manipulated from you
know this block and this information
just belongs together but if this
committee belongs in prop chain we don't
know that's why we also sent for
additional requests to visit visit like
other words from the list so this whole
time my clients
no Desmond transmitters so and then we
asked North beam the disk is a spoon a
and also the note seen that the polity
is that this block really belongs in
culture and began this validation by
getting a science job - so I introduced
a branch because the progress is the
only information we can validate in the
past or the proper shape so it means
remember this smart contract the
registry all these nodes are registered
in this registry and now within which we
can't go to this registry and can check
if this is that notice really the
correct profession and if we find that
one of these nodes is not this one in
right thing meaning that he is science
of all projects we can convict a project
turned out after this gets his deficit
so it is a stun we call it virtual box
trucks
it means if one of these nodes sense
from nation he loses his deficit that's
why this deficit is important hence is
thrown out of the list
so an images behave there will be no
exactly with security we can trust
them so it now is all of these
deformations we get into the program per
entity side perhaps we can validate that
information really belongs to this block
and this that this block is part of the
rupture
so additional to disruption constructs
of course you could also run active hot
stocks which is the additional security
property so they can run in client which
act as he would be only client but he
has connections reduction and then if he
finds one Road which answers gives him
the front end zone he can direct him
convict him an indirect sale
so why is this third Horton so he wants
to have a security so that when I as
client asked for information then I can
rely on the information so when I get
information before of this proves then I
can be sure that this information is
secure
of course including secure in the amount
of debt were often in the deficit which
these nodes this in registry so instance
if these nodes made the deficit of one
each other then I can be secure
they will not wins to lose his sister
Emma said and give me a firm hands of
world for for infest
hello Ruth princess divine send it to
attention to pay for energy businesses
the role of
mong-joon and I know the system in here
is a role of tenure or more or more can
be secured if I would hope that much
work a very expensive apartment of
course I need a higher deficit to be
secured that these notes are not trying
to betrayed
[Music]
so it the disappointments we see that
the only thing North's can do our Enzo
incorrectly for if the ends went from
then they lose the deficit so this is
not a good like how can someone else
check and see if they don't see what so
you just if these new to make sure the
client will never know whether they are
answer is right because it kind of check
out so to be able to check the watch
that needs to see what the client is
progressing so the poor children this
example of course you cannot check
directly but if I have a tool or if a
complete hotel there's a lot of products
in that endless construct which asks the
same question as the normal rule of quiz
tool and it randomly picks north network
in Austin so that these nodes they are
do not know if this the state line which
is the door locked I thought this is too
strong
yes of course it's not free it would
cost me something to make this request
and can I just ask the same question of
the lifetime of it which is kinda past
again after this with another no that is
if I could do this
I think the important part here is also
that again what would it comes down to
it's just a location because everything
is we can verify locations to only
information we can't verify
intrinsically meaning we have to rely on
signatures from the other side and
that's exactly what what Chuck is doing
is just checking for Rockets because
notate and see how all these signing the
rocket you don't even know to be crest
they have no idea what it they have this
loop is simply asking please sign the
block number X and what shocking make
sure that he will never sign something
publish these signatures interactively
to because they send in transactions on
track in connect them or they do that
yeah so it because that's why you use
the deficit because we can convict them
directly on chain so when I ask you time
ask me to ask
AMC and what they actually do is they
will sign that bar cash on chain rent
because obviously note B cannot take the
seepage from a the cement that to my
idea for what the box like that work at
yeah it's a doesn't have to pay it
they are signing of the deposit on
change that you know not the key that
you know the statistic EMSA sights on
system can recover and recover their
property and you know that it is for
them to know it because it gives us
company should get back from know right
like you just take a signal that you get
back because it's about us of marketers
you know if you get from the be the top
hitter you can use it
I mean we will do this we can look at
the proof but you give the menu look
through that and see exactly are we
doing this against its it all caps out
that blockage because they actually
don't even provide the clock and by the
does mean anything if you
even the truth is right this light in
see me to silence so the exact result
having a fix for again old so in the
beginning yes it was in this line after
industry today in the first instance
constant is dead polymers and then he
asked his apostles from the list if he
can yeah I think that's why a good as a
people notes is even if you started
peridot guess today there are some
people to appear so you start with but
if you don't trust them you can
configure ok so now so we discuss that
we have these notes they give us the
sign information if they are from if the
from information they can use the
deficit so there's not a good incentive
for people to run such notes right if I
if only thing is to do some broke and do
some money if I do something wrong it's
not the best decision to run such a
service that's when we also build an
incentive system which means if the
client asked for validators information
then it pays a very small amount of
money to these nodes for getting this
information this edge is not really my
cocaine is an appearance very very small
amount of money so if some waters so I
did not
detail in this session here so but it
originally began if you live so we can
do some different incentive a shimada's
could be a infrastructure ins and
division being given reputation for as
many hood or it can be monitoring this
innovation that we give such a viable
payment and it's this system we can
build a resistor so the notes they run
they give good information a list signed
information and receive some money in
the exchange for this put information so
as I said the beginning it's this
clients doesn't meet is not only in
between talk to it can of course talk
with several options in time because
this kind of never stores some stages
not supervised so we have to say ten
reasons to talk to publicly to talk to
any other human face for even out of
jail and not only this also all data
services which can give us a proof that
the information sprites can be concluded
that this profile is this idea of us so
as I said we have different
implementations the types of limitation
which is good to be included in websites
or mobile applications and we have was a
see implementation which is small enough
to run it on such money and instead we
have several implementations
and who only the validation of that
explosives is the smallest addition and
to fully to find its own EBM and can do
even interactions with smart contracts
so they can write the code in our own
ppm okay they disappoint under some
additional questions
so this RPC request you can ask all the
opportunities you could also send to a
warrant so basically it's like yes it is
the same option additional booster
information we need for a new protocol
means today by a professor but otherwise
you can use the complete obviously this
is the RPC request specific to your
implementation no it's exactly the same
additional parameter is just one it is
the property anything else is just same
as a municipality a property is in this
request it defines exactly what kind of
food but if the signatures we have knows
who responds contains the truth but
everything else exactly the same
we go into the later part of secession
over the Occupy us give me the head we
th call I want to say it's upstate from
country that this response actually
corresponds to the real estate so that
does have about the exactly these
details how we do the proof because it's
an very interesting thing to figure out
to verify each detail okay otherwise
[Music]
necessity being a factor in network
really how many of the actual Hardware
comedians like a big process is not
wrong you mean how big is already be a
more direct the actual deployments was
like piece of hardware like how many I
do not wanna hear so it depends what you
want to do with this type of course so
if you only need some information on
approaching you don't need them the only
meet when you want to interact with
small contracts but you want to read any
storage they are distortion you can read
without
TVM there's no API for that
and Paul to be anything and they have
quite how I know it's true I have been
in the enemy right exactly that's what
if we have to EBM implemented but of
course you can call east get storage
rent if you know what yeah but in for
it's called that was the reason why we
started implementing the whole EBN
because the only way to verify and this
is correct is if you first of all have
all the storage values and then verify
Hollywood hotel and then and execute the
code directly inside England right oh
yeah that seems very happy to me but I
don't know this might ask you it's not
happy and that is heavy as you think
because at least this chip can do it and
if this chip can do it your computer can
do it is so and this has this this chip
here it has 256 kilobytes are you that's
an F and not accept similar diagram and
this means we're one thing my flash and
this is usually the biggest limit
tomorrow and you know that's why the
biggest issue is getting the code inside
the revenues because we need it down as
a code from the small country before you
execute it so if you have a huge
contract you might have issue
okay okay no no sighs see what time it
can take over okay okay okay this is
myself and Simon and the c2 from the
socket and especially for the into
protract and then also delete that so a
lot of code of the code was written back
and it's white on a piece of magnet so
in order to get prepared for that I
wanted one in actual code somethig
because they only wanted to re-enter
this is the token image this is a
similar image has all the food chain
that you need through two mains to
compile some C code to each other but no
java code if you want you can already or
not you can also take this beast exclude
too much to download because all the
things I will show I will just call talk
a run and use the same type of
containers away as the same environment
we don't have to figure out why
something does it's done
okay
[Music]
attached anymore-- put a capital buddy
[Music]
anybody else
okay
[Music]
ky you're downloading some imagery and I
would like to give a short overview also
nice because we need to give you where
are we standing today just a few weeks
ago what we did this VM prepare the
googlies candidate one set of final
release yet because we went to a
security audit and this video is not
finished yet I mean that's why we cannot
have been productive release the
students finish but we already published
everything so it's ready to be used to
be tested and we also would like to
invite you to do this to test it out try
it out to see how it works for you what
we have here is if you want to go and
get hot you will see a lot of
repositories I just want to show they
explain them with what you can expect
when you can see that the first thing is
as the step mentioned we have two
fermentation the typescript
implementation is was the first one we
did actually empowered a little bit over
a year ago this time of the tax code
first and more like a feasibility study
can we really verify everything and we
can that's why that okay looks great the
times good but of course statute itself
and around the bike controllers that's
why we said we need a special
implementation for the microcontrollers
and of course we thought about how what
what kind of language are we gonna use
it would I would have loved to use brass
for something but if you look at the
industry today all the people that are
building stuff on my an IOT device
control of all the two trains and all
the merriment is written for see if you
write something in C it will light them
about that's why as well so we did some
tests you can get very very small binary
service so so that's how we did it after
implementing the whole thing in C as
well that's alright that's one
repository it's just a three it should
have been called iDream minus TS because
actually that's good but first we will
be set up in his name and we have this
item minus C which is the same
limitation that's why between
repositories and of course that's what
we postulate that this that will
represent this node then we talked about
these notes it will provide clues this
time three months story this is what we
connector and then we have two other
repositories the common is more like
youth utils and default configurations
of the default lowest who don't are
configure there and I think contracts
this is just on the closet or rather
than all this mother comment it's not
they are just actually two small
contracts we do all the work but of
course they are very crucial with all
the tests so this is the common github
we have to toughen images published this
one is into client itself so if you
don't want to install it you can run the
into plan directly as a toggle run
command and this is sometimes very
helpful if you want to replace a light
client for example you can
run commander Zhou Popovich and this
will open up the chest obviously ports
in every weakness that comes into it if
you will then you communicate with all
the words so it can replace that running
client and of course the other one is
there and we load which list and one
point is not this is also what you can
talk about later how you say you know
you should run
and then of course was presented for the
typescript JavaScript we have something
epic address we have the most important
ones in the plan itself the target for
the C version we also compiled to Bosman
this what we are the second
and the moment it's experimental at the
system book very nicely and they keep
cool to see if you come at them I mean
even will bring the same result but this
one the tax conversion has only took the
dependencies that you all know and well
then tha has libraries and all this
stuff and usually gave a lot of
different modules so if you package it
comes down to the size but two megabyte
you can look at it Boston the Boston
planet is about 170 kilo byte and
everything in them completely VM and all
the stuff in his no dependency at all so
which is pretty cool aspect was from a
security point of view if you think
about it and having an module with no
penances where I cannot mess around with
brother-type so all the stuff really
despite that in this quite fast yeah
seen this year we've covered it's just a
few tips how to centralize
so this is the most important thing and
if you want you can also put it up in
video Doc's we have documentation here
we try to put in as much as we can and
this information so hopefully in and you
will be able to find almost any answer
in there if not let us know that we if
this is something to document that's
what I'm out there when you look for
information it's usually a good starting
point to start with redox salts also
explain the content of chestnuts then
explain the background and all the
details references okay good so I don't
I
are you ready so far to start the topic
image
oh you're still downloading or
installing maybe we can switch cables
now because especially
that's on this okay
what
maybe just you know with you what we
want to do some you know better things
okay maybe to give you okay what we
wanted to is I will first sure a small
example how to use to Tashkent because I
think the touchdown is targeted for a
study most def developers because
javascript today's the most used
language when it comes to the use of the
face there's almost no alternative right
now it's fine if you putting it there
and do not want to rely on their brakes
ever an extra bucket or night or
environment where somebody checks that
we object for you then you would be very
interested in favor is that's why the
first thing we've just to the JavaScript
coding party types of time and then we
work and used its C client and because
you proceed like there's different
targets you comparator what is it like
it just a similar executable that you
can even use a man in the best foot we
will play around with that bit
to do with it it's actually quite a lot
but you could just use command line you
tell and then we look at the seat
directly by this small sample
application and see how to use the ink
you climb there and then maybe we'll
look in the choppa because we all have
binding to each other into the Chava fly
itself will only use the C client in
every night interface but binds world
and the natural feeling for child
develop why drama because especially
when you were appointed develop native
Android apps
and then in the end also time and what
we almost wanted to do is them to a deep
dive and may actually think about
switching that if you in more interested
in fact when university-type about how
the verification work what you want to
do it the practical things first right
okay
maybe a nice to think that now because
they're already a few question about
that and I think that will help to
understand a little bit more how exactly
very few works we have X ok
so well as mentioned before what we said
what we do is we said obviously we trust
first of all this is a design decision
because something's mm why do wrapped up
used to delight time to do well there
are reasons why we don't one of them is
in these clients if they're not only
stateless some of them don't even have
internet connection being made using
like temporal power means you have to be
part of the peer to peer network and
this is a requirement we do not have we
don't have because the industry does not
have internet connection
but we can still use it because we can
use the and he is supposed to tools for
itself so it's used internet connection
out of your phone that's what we have
subtracted this transport layer
completely it tastes obviously exactly
perfect for that this is also one reason
why we cannot rely on the p2p network
where you have to require men to have an
active internet connection so that books
also for offline devices that's yeah
thing is of course usually what you want
to do is most these mice will sleep all
the time
I'll go along and once you want to poke
the door he needs an instant answer and
if you want to let me like time for the
call
you will start finding ups for us so
that's why you get instance
[Music]
but in order to do this that's all we
have these note this so you will know
your peers deployment that's important
and you know exactly when centers you
randomly choose one and say okay I want
this prove this and for you but that's
really how it looks like you see this is
Petra extra seat chest obviously and
here you have this entry property where
we define okay
what kind of education do we want and
the signatures from which above notes so
then okay the response looks the same
way you see it gets a result as usual to
us now you see the truth out there so
that intrusion I'll talk about it in an
event
what kind of who exactly are but we
won't approve you two signatures where
requested last time temperatures other
lights last notice this is the Bruckner
home where the last event have the
registry meaning whenever a new note was
edit this last note list will change and
that's why the client will figure out oh
it's time to act in my own system so
that's why it because it I need to
always be sure that these notes are
still male
positive yes it also Victor is the exact
if they ever convicted get kicked out of
course you've won make sure they don't
ask what you can't withdraw it if there
is a timeout actually before you can be
tried because the one of the attack
vectors would be you can do the wrong
enzyme and then with a 42 yeah
so when you register you even came to
finance a maybe it does exploration time
for maybe one day or maybe one hour need
to find that this is also something that
inclined it's considered because even if
I'm getting the signature from this guy
I have only maybe one hour to convicted
if this is wrong
well this guy have little more time so
this means I would probably choose what
somebody who has more time does come as
a hurricane as - it's hot the impetus
for contract information so he knows
exactly how long he could
but okay now whatever we explain that
this is a good poem on how this deal
works internally because this is how
these booths actually work trooping the
information we get heads of what kind of
initially asked so if you can ask for
example for plug that would be the
easiest use kids if you call ISKCON up a
number you get is the data of the block
head of an example the block cannon
itself can be easily verified all you
have to do is you take this data and
sterilize them as block that's the way
we do it here so you just need to make
sure you bring it except in the right
all the end and there are some small
things you have to consider but if you
do it right you can create the data I'll
be encoded and this byte array if you if
you like
get a location so this means we can just
take the data rate the pro cache then
compare the design projects and if this
is correct
you know the $20 right this is probably
the easiest step to verify your data now
the next thing is transactions if we
want to make sure they would render from
the poison let's say we call this get
transaction perhentian where the
transaction data we wanted now verify
that this thing about correct what we
need to do is we already have to block
anyway also will always need to verify
the project first and as one film the
pocket has called the transaction would
the transaction would is just a hash 32
PI and this traditional
to be specific with an attrition of the
tree and each transaction in the clock
is part of this poetry and if you want
want to verified you need to know the
path inside remember tree and business
are included protection you take the pen
actually index call all the encode and
then you have to pass inside a
transaction tree like this now the truth
they don't deserve a we'll give you is
just about the truth of this protection
would sterilize each node on the way to
the protection self we will have a look
how this think he looks like but this
way you can then create a hash of all
these noise if this hash and executed
protection would you know what to do
that's correct but in what is of here
again the transaction bill I need to be
sterilized in the current way that's the
way you do it it's estate on these
values the nonce the gas price to put it
India whose Albion code and get the bar
transaction this one transaction can
then verify the movie if this is correct
the transaction was c-notes exactly the
same way so if I ask for transaction
receipt we does a different field in the
block and escorted to the seafood and
then we can verify it exactly only
difference here is the way we sterilize
it DBC desert that two different fields
have events for example are all part of
this protection c2 need to sterilize
them as well
this code will give you the raw bytes
for the transaction receipt which is 10
poverty's look at the tree
then the next thing is with you call
each get balanced myself or you get
storage that or get friends actually
count these information they come from
the account object and then account
object are verified as all apart from
the retreat by the different one this is
a statement so if we're in statehood as
part of them the prop Hanna and then you
have this mode tree where Ali's accounts
upon stolen so it's him then she count
it has four fields we have to dance of
the transaction count we have their
balance after account the storage nation
which is again in the mutant for another
country and left cortex in case that is
code doesn't is that more code and we
get always this fixed value for rotation
the h4 empty cold
so if you so you can help verify they
counted out correct
it wasn't long about this is for example
than the stomach cash that we need to
verify that did not and his last year
and was not really part of any how
physically you were not able to get this
information to RBC so that was one
reason why we need
another function for that and
dysfunction that's why we created this
VIP from East get proof and I
implemented full crest for gas it was a
cavity and then they were up
so it's in there's at least for almost a
year now and you can truth is exactly
the spectrum it will he developed rules
if you need for that the other things
for the transaction and traffic Lucy is
something you can build up from the
existing data you can just collect all
the transactions each stratum oh good
free and and get through but here you
need the special function this is now in
there and I guess which has been put a
little more now to make it official
because it's still trapped it should go
through a lot of people already using it
yeah once it's why we here like two
steps actually for a count of ten first
we verify the account object and then
all the storage values did you meet this
one contract are also stored in the tree
and this tree is that particle so you go
two steps yeah yeah this is how you
paralyze the account object
go and ask that's some small things to
have to watch out for example events and
then if this doesn't exist that that
doesn't mean you get zero out of it
usually because you get the nth temp
that's why it's checks if it's in that
existing want you to a different kind of
proof because this was more than a
challenge there we are the tools are
great but the challenge is how to verify
something does not exist for example
device called East get balanced and get
zero how do you have verified with the
whirlpool then this is correct and it
works you can do it but you can with a
Patricia movie three either to a little
bit tricky to figure out the
correlations where you can't be sure
that this cannot exist because there's
remove branches and some French nodes is
dimensional for example lead 2-0 mehendi
branch can you know a can it sister
[Music]
yeah then the hardest one was actually
there the truth for youth coal because
if you calling a function you need to
execute it locally there is no way you
can simply run the proof on the door
time to verify the truth so what we did
here is the first thing is to know
itself it's collect all the proofs
how does it work for cavity we used
actually a trace calls which is quite
nice
meaning we are asperity it give us a
trace of this call and we went to each
of court and look at whenever we found
something that they realize that some
kind of storage value then we know we
need to verify this we need to create a
proof of this torture or even if there's
a balance of cold as a so Apple s load
or I will call some other contracts we
collect them and then continue through
the process so then we have a and just
the proof all the storage is class we
needed of course the code itself
this can be cached at least so the
client has that we tell her to education
the code every time the code can be
easily verified because we have to call
attention as part of their account truth
so after we collected all of this then
the client needs to go through and
execute the code itself this means
that's what is called kind of Cho Seon
what we did here is VM credit and above
the tree we created in new EVM to verify
that we went through all the comp
objects in quantities data in this
and after this we create a transaction
and ran it in this together and then
afterwards we just pick up the result
but it's a little bit simplified but
it's basic what we do and it's what the
tax plan is to keep in the time scale
and we used a steam she has a limitation
we don't want to be able to be a
platform for the C client we have
implement house ups because this is not
the same way so example first of all
verify everything and then won the Court
itself in what running it also needs to
check for example if all the values
needed apology it cannot be anything
that's terrifying
because we need about codes we didn't
know which of course will be executed
when you do this is goal to because we
need to find it as load and balance of
great self and then is called at least
makes it easy because you get it all in
one week rest and then we absolutely
need to find the ones and people collect
the food a bit if again it's a
little bit more difficult because these
trace functions that gets us currently
supporting only for existing transaction
but there are already mind it doesn't
help with it it's gone that's why what
we do at the moment it's a little bit
slow and because we get to the code
execute code whenever we hit something
out of court make simpler then we ask it
give us the storage value and then we
collect this in this way but this means
it is way slower because you need more
than one request for getting
Norwich storage unit ascendant Integra
yeah so that's why the canola collectors
it has all information but the stateless
client needs to receive all information
needed to toe area fries within the
response that's why that's how he's cold
[Music]
okay let's do some practical things I
don't know how many of you actually
but what I'd like to do is I would like
to go through to manually verify just
look for the transaction I think it's
very interesting this to it at least
once I mean I I hate to do it a lot of
times when I was debugging all this
stuff really something says okay the
hash doesn't match nice why so it's why
when you go to the mill the trees and to
all these things but when you do this
you really try to understand how this
one fits together I think it's very
interesting do it at least once here to
go through that to actually manually go
to a real good proof and see how this
works
okay
okay so if you for example can start to
talk to them you can also do it
[Music]
a decision you see one screen
good is it hope it gets his Camaro I get
hospitalized just the very top the
plenty the right home for the right to
the net Delta team site probably miss
your presentation
escape the presentation one
tuck it so so what existed here thought
the same time container that we
mentioned here beginning and as part of
decency China was a small beautiful that
this is Allah P utility I can simply
given any data and it will automatically
not like ok pika
even though pickup will be hot because
you see will see a lot of numbers ok
let's see if it fits in there
[Music]
let's pick something that also to show
you all the stills nation from all test
data
so
this is a request a transaction by hench
as you can see here and the result is
the transaction data itself and this is
the truth and now let let's just go
through this process in detail what it
is the first thing that we see here is
this proof contains the Kolkata this is
the complete we have here and if you
were to take this if I do this I just
did alveta code this bucket up and you
will see here a parent ash - improve
detection with all these data and pulse
it will calculate the hash of the deal
itself if we look in here the response
head of this project if we compare them
it matches so maybe we know at least
this is the bucket up
and of course if we have the signature
for this block engine we can also
confirm with this with so now that we
know that the project was correct
we can now come and look at the
transaction data itself this is the Moga
truth for the transaction the first
thing we need to know is if you want to
verify the truth
transaction index we noted transaction
X's 171 or it is also the same now we're
here
it's actually a B so now we have to
actually fix what we can do with this go
exactly the same things and through what
I explained we stopped with dead
transsexual which is this one and go now
this path the path itself I mean we can
simply calculate the transaction index
[Music]
so this is what you see here this is the
path inside the military now and now
what we can do is we take the first note
of them
and these surveillance in what the
cesium is that's how we didn't know the
new military looks like this is a French
note and these are in each member has 16
spots can say and these are the six is
not in this especially the henna the
first node must be at the root H it's
also broken up to the v8 b5 suddenly
very small screen we with here at age 45
this is the one Ventress so that's why
we know okay that's one now we looked at
our path eight 118 so the first part
will be here 8 which is this distant
attention of the next node and then if
we go in we can now take the next
thought
this is next month
this is fish
and eight is yellow matches so this
would I can do this now all the way it
will look bad at the last note
the last one is at least a leaf node
meaning this this is the actual value
what governments were just a bastard and
this week note had developed is known is
here
this this is a bra transaction so I can
take now these data from the spot
transactions and in compared to the one
we have here to solve so we have to
guess for example which is this value
matches we have to address which is this
one matches and that exactly in to tie
this to it very fast to know the truth
just as we've been mainly here now and
then compare each data so response make
sure it's product and they should we
have a lot of chase and test that if I
promise try to fuss around manipulate
and make sure that it will detect each
change okay because of the are any
questions for that how how this works
all this I mean we did not invent this
move this is publish the same protocol
but we are using exactly this to marry
five
it's our choice of those accomplishments
those nation LP because we had to
implement some being cooking for the
season anyways into it that was its mark
events and due to that that just
released a part of yours
it's part of you about I didn't see
client down but it was quite helpful
I mean I know guess also has an alky
code I think goes up like this the only
thing he entered will be easier I put a
lot of tea pockets after that because
you it kind of guests what it is looking
at now appears looks like a blockhead
out of this look like a transaction and
so it used to be names of it makes it
easier to read but this is more like in
total 12 to play around it but really
helps understand a bit what's going on
inside okay if you want you can try I
mean in the target
[Music]
okay maybe
what about whatever back to do next is
just to show you that execution action
would after if you can do it for
yourself if you first attach the client
and then maybe you can also use the seat
line how to use it how to install
attending theme it's not very hard
because of all these things that we have
seen here are going on directly inside
the client from a developer's
perspective you trustfully use it you
don't even have to care about them the
verification is just taking place
meaning you just use it and when you do
this this
[Music]
then screen of every single and chance
cook I do in terms community so it's
even easier than taps good to go sittin
after except a pastor but the
implementation is completely done
typescript zone in the image itself I
hope we've also done it all the node
modules is all install to don't have to
call Indian install but if you will
start what you usually return we'd call
NPM install nine three more positive
you'll save it like this I guess that's
where everybody goes home but in the
solid include by modules it's already
done here that's why I don't have to do
it that's why you see that's right
simple theme on the first thing you have
you do is you just require
this
[Music]
because we just did default meaning this
is the class that into class and now we
can create a client so this is pretty
easy and straightforward if you do it
like this it will create a client with
the defaults but if you want to can of
course pass there's a lot of
configuration meaning even you can
define your notes that you want to use
became a time like there because count
how many mystery of all descent on the
signatures you want to have one
important parameters explain the chain
ID which scene you want to use in the
moment we have to provide on a girly on
comment on the main net but we will
probably head into wrong change that
how do you establish these proofs are
going through their roots and the
treatment is part of the head to the
chamber such a mood recently belongs to
the chain this block the block belongs
to the tail okay yeah
and then the way we do this is by
getting a signature from gather notes
they need to sign but this location is
correct and the reason why this is this
works is because the signature can can
then be passed to the smart contract
itself they can call you a couple to
make sure that's right not and they can
also verify system that at this location
is correct because there's opcode ok
popcorn at least for the last 150 six
blocks you can directing the spot
contract find out if this is correct so
then we can compare and we know even the
if this was correct
I decide it was not and it was not then
Cuba two systems and even for all the
clocks because this was in the beginning
we had only this 256 box
these are the likely low-hanging food is
the easy one but also if you
further back that we created a second
contract it's a professional interest
rate where you can then construct you
know Lovelock's
you need to deliver the proof set to
work on the truck headers and out of
these block letters you can then prove
that certain locations - one for this
bubble
exactly that we've put a lot of thoughts
in it as well because you're right this
is something again that too many
vegetables don't think that much but
fidelity then at the moment there is a
configuration and I get middle box
height that is how many stalks do I need
away before I actually signing location
because the quality's not we'll just can
we trust please sign up number X and
then what it will to say is this really
final because if it's not final I would
risk losing that deficit chest because I
know they're on the wrong foot I mean at
the moment if you eat ur skin packs and
what the f this is nice that there were
max greenbox some Reeboks
this kind of um but it moment as a
people we use for six blocks so it
usually the note will not sign any drop
that is younger than six box so that's
why if you ask for something that's
under this you will not get any
signature the latest book is not fine
whose RTC qualify us for latest kind of
support right you would probably have
the latest but tomorrow for latest life
checking the decision for the thing so
nobody thinks about it asking for us or
four days ago but it is also not the
security vision because so Sergio puree
is the only little pain if you asked for
today's product you will never get the
signature because no note will sign it I
mean s exactly what happened we can test
it body what's happening is that if you
climb more than simply say you will be
tracked them to respond to us to set I
want to have two signatures
[Applause]
you