[Applause]
opening probably you have heard about it
and simply because of the security
audits we perform last year we audited
this community compiler we all saw what
I did a lot of profits for coinbase we
audited but in the days the serpent
language and we broke it by the way and
most recently we are today the
well-known compound and instead of you
probably also known know us because of
the open sampling contractor was it
really one of the most used libraries in
the civil system that has more than 20
to gain of 10 days per week and that
probably everyone that has developed
under ERC 20 or ERC 721 probably used
discovery so gender for today we're
gonna go through how we can develop
smart contracts using the open 17 SDK
afterwards we are gonna see how we can
build jobs super super easy using the
opens of these charter kids and
afterwards we're gonna talk about sound
DX
uxn main problems we faced while you
know developing doubts for for users and
we're gonna talk about the open ceiling
GSM groups so the first part of this
talk is gonna be about DX and the second
one about us developer experience their
user experience so let's start with DX
it's super important for us to know what
problem we have here
I think that if used a software
developers for developers and have
worked in other ecosystems proud of you
no doubt our tools are still super
super-great
compared to those other resistance and
us in opens up then basically love to
really stop for you to make your life
easier and that's why we built two super
ace the tools of our Java SDK NGO in 7
easy targets let's begin with the opens
up in SDK G opens up the SDK is a
software developer gears or a software
development tool basically a CLI that
will let you develop your own contracts
compile them with any version of
solidity want deploy them with this only
with one command upgrade them and we can
talk later about that interact with them
in a super easy way and also start your
jobs like in five minutes how you can
use well its name package open Zebulon
CLI so just running MVA and PM install
add-ons eminence
like whether the tree you will probably
first want to initialize from project
you can do is that you can do that using
the open Zeppelin in the Koran it
basically will run a lot of stuff that
will trade your contracts folder it will
set up your network configuration file
and a couple of other things for you to
track your different contracts within
your so basically we want to
develop our conference we have a my
contract contract which has do something
function that receives something brother
Sonny super easy to understand we only
have to run open setting create
specifying the contract name on the
network name and that's all you will
have your contractor your contract
deploys for block you to the maintenance
Network in this case but if you forgot
all the pointer name or the network name
it's fine all the open sibling contracts
are interactive all the organs of the
commands carry the map - and you will be
able to just run open setting create and
the CLI will guide you in the process of
deploying your contract so for example
here we have a contract my contract in
maintenance at the address one area the
one the strands with one Ian and we
probably want to talk with our contracts
right because we have already deployed
them and we want
for example functions see the value of
variables or maybe just two transactions
G opens investigate has two super handy
commands which are called and central
section call for calling pure view
functions and central sections to any
other public function of our contract
that will actually create a transaction
they use usage is super super easy
interactive comments if you just run
open second column or central section it
will ask you to pick a network of your
network configuration file it then will
list all the instances you can create
afterwards in will I mean not create but
to call afterwards it will list all the
functions that that contract has for
example here that there's something and
I already show on a community function
and just by selecting the seventh-inning
will ask you for each parameter the
function s and that's it that's it you
will see the transaction cache which you
will be probably able to copy and paste
in ether scan and see how it did well we
know that software development contract
development r is done by developers and
universe are persons people people make
mistakes every timings we know this we
know what's happening right now in this
modular system we can just push our
broken code and a lot of jars
millions of tourists can be lost and
it's important to have like tools for
getting rid of these problems so
probably upgrading our contract is a
solution if we have a my contract
solution my contract contract with our
do something function which might be
broken with her
witties just modify the code we can also
add new functionality and just run the
open setting up great command which will
reload the new code in the exactly same
address I'm not gonna go super super
deep in this topic you can afterwards
after the talk asking questions but if
you want to just see how it works you
can look to assembly in such a great son
that dresser is a mutation per unit
anything else well yeah we have seen all
the left commands yeah at least this one
that they actually did create a great
fall in central section but we also
developed a lot of superintending events
for example moment something compiled
for competitor contracts with pennies
for the diversion horns open 17 verified
for verifying them in ether scan or a
third chain of insomnia comes for
listing all your accounts within the
network open sudden transfer for
transparent not only Navarro also ERC 20
tokens open separately matters for
wearing a valence of an account again
teen ether and in the RC 20 tokens and
opens at the impact that is volatile
I don't know when okay okay
so really pilot who made this
presentation for me because I'm super
lazy for making my own presentations
wanted to save me something right well
basically the open setting unpack is the
command that will they test let us link
the open something SDK with the open 17
stories
open semanas targets are basically
tab scaffoldings that will let us charge
our jobs super super easy take blue team
well-known open something contracts the
opens of the SDK
and talking about inferior for
connecting to any blockchain very low
chain a one-liner that will allow us to
configure super super easy for three we
have to remove for our front-end
components and also G opens up the
loader which is basically a tool we
developed for you to modify your
contract and see the changes of that
contract in your web app just saving
fire so you had a new function for
example that you are reading the API of
top contract you will be able to find
75c value function ID within your
website so super e seconds you use with
the SDK we just have to run over
something on that starter which is
basically at an empty version of the
starter kit so you can start your
project from from scratch or open simply
unpack tutorial just a super fancy very
we're gonna see later or open something
about GSM and I am going to hear a split
earlier because we're going to go deeper
every GSM in a couple of minutes but
just running MV around start with the
trick you will be able to see the demo
there are two samples for you to learn
how to use the open second instigator
Pantera and even budgies super easy to
understand if you want to go and see
what is this police go to assembling
slash targets or settling slash SDK to
see was a 20d SDKs and I think that we
may have solved the GX problems here
mean we have a lot of these problems
that maybe you know now you can start a
project to play them with only one
command
interact with things your equity your
fault I don't know man upgrade with
other command verify them with other
command but this doesn't solve I mean
this is solving our problems as
developers but what about the product
usage like real people tasks by the
people that everyday exceeds in their
desktops or laptops for example my
father which by the way loves to buy
stuff in the internet I'm from when
Cyrus Argentina we don't have Amazon
there but we have a person our website
that is calm and probably wouldn't that
basically is acceptance and you can buy
whatever you want or I don't know food
stuff and just by adding your credit
card using your credit card you can
picture stuff in your home life two days
later but what about by the way my that
is 73 years old so what would happen to
him if he's in his computer and he sees
Jesus pops like what the what the
is minimized what the are my
monies Woody's private keys with our
private keys spur counters have for him
not for us because we're developers but
for a real user it will be super
Congress on so my dad will be sad
because he won't be able to like his tab
and the post will troll him and that's
not good so it's a pact and it's well
known fact by the way that we lose the
ninety percent of our users in the
install America's image clearly what we
are missing is user experience that's
why I'm super happy to introduce you to
the gas station Network which is the
ultimate on word resolution 43
obligations basically the GSM is a great
contract architecture in the blockchain
that was first developed right
developer by an alliance of companies to
compensate the employees Peter for
solving the user awarding problem I'm
gonna give you a brief everything
protection about this basically the GSM
is composed by a centralized group of
three layers who are paid for millions
on sections we're gonna go deeper into
this later but believe me they are like
you know frilliness a single unaudited
by open 17 contract or coordinated
everything that is called the relay hub
your jobs will pay for their own
transactions I mean if I made an app I
attack I will pay for the transactions
not to you sir
so my dad doesn't have to or any user
doesn't happy that doesn't have to
struggle with the pulse which is crazy
so let's go and see how does it work
these however players are used to my dad
every day urge every day hat and they're
receiving a contract which is our
smartphone direct at least linked it to
a hotel we don't know how a regular
transection works and that choice to
minimize mana must help him help scheme
to talk with the contracting with your
look change we also know how manage from
sanctions pretty dramatic from sections
work
I got will talked with re layer under a
layer we talked with the blockchain
maybe or probably using an identity
contract assigned for my dad did you
send militant section solution works
slightly different basically my dad will
talk to her later this relator will
check whether or not the recipient
contract has funds for payment
transaction fees and to pay Gerry later
fee because here we have very little if
you're later if you want to start up
every day or just to go easy treatment
to me like I never five-minute thing you
will be able to actually get paid for
those
you relate so if you have 100 real acres
and there are a lot of transactions on
pure relating you will be winning
earning money so as I was saying earlier
will check whether or not the recipient
contract has funds to pay for these
transaction fee and earlier fee and it
does generally not every day have this
contract release
by the way deployed by us in every
single motion and its unique there's
only one for each ball chain will do the
several checks for example if the relay
called is legitimate and afterwards it
will ask the recipient contract whether
or not it wants to accept a relay call
if it does well it will actually send
the relay call to the contract to the
recipient contract and the receive under
a hub will be able to pay earlier for
that transaction so basically it's the
meta transactions on roids because you
don't have you and when I say you is
basically the smart contract developer
deduct developer you don't have to like
think about you know assigning identity
pond'rous to users and maybe afterwards
ask the user to please his credit card
or you know doing a simple transaction
by pressing the botany in your website
that's why I told you hear that jobs
paid for their own transactions which is
great at least for the onboarding
program and how can we use this stuff
because I'm talking a lot of technical
stuff and maybe you just want to use it
well we developed as a team the GSM
provider you can install it using
the gsm provider is basically yet
another web through provider that you
will be able to use to transform your
regular transactions into management
sections into relay have read a GSM
transaction so just by changing your
typical HTTP provider to the gsm
provider you will be able to do a call
as in the third line my contracted
methods that do something the condor we
were seeing before dots em and that's
all instead of you instead of doing a
regular transaction it will do a
management session which is great right
so you only have two connections we
change one online also you have to make
your contract gsm cable and for that G
open Zeppelin contracts or open settings
solidity team created a couple of
contracts for example the GSM recipient
that you will find you the best miss
Pauline obviously open something
contracts which just inheriting yes if
you have your country are you enter it
and it from it you will be able to
access to the accept relay call this
function I told you that I checks
whether or not the recipient contract
wants to receive their the transaction
or not well you can code that in that
separate home
and what else do you open Zeppelin GSN
helper so maybe could be for you to you
know set up everything to develop your
own gsm cable capable of ups and we
basically developed this GSN helpers for
you to make it like in only one two
minutes just by after installing the GSM
helpers running if you run us GSN
regulator this will basically create a
relay have in your look
if it's not created it will download the
binary of the relator
it will then start the relator it will
associate that we later to terminate
have and will fund it so it's capable of
receiving from assumptions really really
close and if you don't like she likes
you also can use a chromatic way which
will be basically important ever issues
to really function and upon recipient
function from the same library and just
with a one-liner
you will be able to order a layer of
other recipients or whatever you want
and we have been talking only about
Eli's code we also develop some web
tools you can go to sibling / GSN tool
which will let you see I mean if you
develop your own contracts and you
upload them and you link them to the gas
station network there are GSN capable
you will be able to see all the
information at the top - with the doctor
and also see information about their
relatives okay I know I got like talked
a lot about a lot of life you know to
sue sue sue so spoiler alert ended you
can use the starter kit the GSN starter
kit just by running with the CLI open
something aambat GSM and you will Gerry
have the open something contracts on CLI
as you having to previous starter kits
inferior gonna react Greenville again
and you will also have it within this
target the open something GSN provider
and the GSM helper so basically by
running of mdx if this point
opens up like advantages and you will be
able to just start your gsm
capable job and well that's all this is
all this are all the researchers we have
been working on for the last year the
contracts the CLI the GSM provider the
GSM helpers the open something network
and opens up into scalper for you to
test your contracts you can at least go
to 17/8 part to see all of this and also
to simply in / dose to see the
documentation and thank you
[Applause]