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[Music]
so now we have Sebastian welcome um
Sebastian is telling us about online
selling without internet
connection thank you hello and how many
of
you now yes how many of you have uh use
a payment System addal payment system
raise your
hand how many of you like free software
it your hand how many of you know the
software that the payment system is
running okay
nobody so
uh how many of you know know new new new
Tyler already okay couple couple of
hands so uh I was this is not about
talking about new Tyler you must already
know it but we are this is an update of
what we are working on so we are working
on um local currency and lastly
um this is how it works so from the
wallet you first uh for the one who
doesn't haven't used yet G Tyler you
first withdraw the the coins you spend
it uh you get the ticket from the
merchant you spend it in the merchant in
um with coins that are blind the
signature so you cannot link the
withdrawal from the payment so no one
can trace you uh what are what are you
buying and then the merchant make the
deposit and get the the cash back uh
from the merchant bank account right so
this is I I already know but we were
thinking about if a merchant going to be
like for example here uh selling stuff
and doesn't have internet connection how
do how do you trust that the wallet did
the payment if you cannot check online
so we found a
solution uh basically without too much
too much saying we we are using a a top
code generator that the merchant H with
a shared key with with the merchant
device so in the point of sales you can
check that uh the wallets transaction
has codes uh that that are valid for the
purchase so when the merchant when when
the wallet uh pays you get information
for the merchant back office right and
it has some verification code that can
be validated with the with the merch and
Point of Sales so as you can see here um
the point of sales um talks with with
the buyer set the amount and uh it
creates a contract that is going to be
paid and generates the the the key that
will generate the code that is going to
be transferred to the point of sales if
the point of sales um validates that the
codes is the correct one it checks that
the the purchase is real so you can do
that without uh the point of sale being
online with the
merchant so this is an example creating
um uh a QR code the merchant can create
a QR code code that is going to be put
in the point of
sales you set uh the description the
summary and a fixed price and then this
is what you can can be printed in the
point of sales so you can scan it when
you roll it and pay it when you pay with
the wallet you're going to see the the
confirmation of of the transaction with
this with these codes and this code is
what you can tell to the merchant to say
I made a purchase this is this is my
code okay and the merchant can verify
that because there is an OTP validator
in in the merchant
device so there is no demo because uh
there's too much thing happening right
now and I we are going to be
implementing this this feature in the
batch and I think the sooko village is
running a merchant and tile exchange and
we are trying to to implement that so it
can be
tested um we also will be in the house
of te every day at 3 pm. we are going to
be there just for talking about Tyler
and also maybe a workshop to set up a
local
currencies and that's it and there is a
lot of Hell wanted testing translations
also testing the
deployments
and that's it thank
[Applause]
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you