Hyperledger Foundation Hyperledger Sweden, 4 Dec 2020

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From YouTube: Enterprise Blockchain Technologies course and CLI based config generator

Description

A session of the Tech Study Circle hosted by Hyperledger Sweden on December 4, 2020 were the group reviewed a new open source Enterprise Blockchain Technologies course and looked at a CLI based config generator for Hyperledger Fabric.

More about the event is at: https://www.meetup.com/Hyperledger-Sweden/events/273763934/

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Hyperledger – Open Source Blockchain Technologies

Hyperledger is an open source community focused on developing a suite of stable frameworks, tools and libraries for enterprise-grade blockchain deployments.
It serves as a neutral home for various distributed ledger frameworks including Hyperledger Besu, Fabric, Sawtooth, Indy, as well as tools like Hyperledger Avalon, Cactus and libraries like Hyperledger Aries, Ursa. Learn more about Hyperledger projects: https://www.hyperledger.org/use

Case Studies: https://www.hyperledger.org/learn/case-studies
Training & Certification: https://www.hyperledger.org/learn/training
Tutorials: https://www.hyperledger.org/use/tutorials
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Events: https://www.hyperledger.org/events
Vendor Directory: https://www.hyperledger.org/use/vendor-directory

Subscribe to the Hyperledger Newsletter: https://www.hyperledger.org/newsletter

Follow-us on Twitter @Hyperledger

Learn about Hyperledger Membership: https://www.hyperledger.org/about/join

#Hyperledger #HyperledgerMeetups #Blockchain

A

B

So, okay, so yes, okay, once again hello and welcome to this hyperledger, sweden, meetup and my name is roland and I am happy to be your guest for today's session and today I think it's a really awesome one, because we have two guest speakers here and the first one will be raphael.

B

He would like to introduce us his blockchain course.

B

He has developed a blockchain course on education level and he would like to present it to us and we will see how this goes and how we can contribute and how we can use this to improve our learning process and the second one will be robbie or really, and he is going also to present us a side project he has developed and he has developed a so-called command line interface tool and with this with this tool, we can this tool can help to generate the configuration material for hyperledger projects and especially for fabric, but I think also for other projects and yeah.

B

So this is a very short introduction from my site and now I think the first one is rafael and when you're ready, rafael, you can take over the session and can present us your screen and you can start if.

C

B

C

Thank you ron. Thank you for that introduction.

A

B

A

B

C

Stop your screen share, so I can start mine so so good afternoon. Everyone. It is a pleasure to be here.

C

I would like to talk very briefly about a project that I've been developing in the last few months and this project is a blockchain university level course that has been done in the context of the hyperledger summary internship project.

C

So my name is rafael: balshir, I'm from lisbon, I'm a phd student and I'm currently exploring watching interoperability. So how could we leverage several blockchains for uh new use case scenarios? How can we make blockchains talk to each other, and I think this is a very interesting area of research which also combines with the course I've I've been doing.

C

You have my personal website there. If you would like to check some of those I've been working with dave husby from the hyperledger foundation and this course focus focuses on fabric and hyperledger number.

C

So the outcome of the internship was the course we called it enterprise blockchain technology, because the the idea is to direct the course more to enterprise blockchains, namely hyperledger projects, in a way that they can be taught at universities.

C

So the idea is that we have a course that is extendable, extensible and standalone, so universities can pick cherry pick the modules that they want to use and easily adapt them to their audience. Currently we have two modules: the first one introduces watching and the second one focuses on fabric and a little bit on umbra the goals of the project.

C

Firstly, it's to teach students the theory on blockchain, so what is blockchain? What which are the technologies that support blockchain? Which problems can it solve for that we divided we associated several labs to uh to fulfill this goal. The first laboratory talks about distributed systems. So what is state machine replication? What is a distributed system?

C

um How do they? How do separate nodes talk to each other? And how do they decide on the common truth, which is essentially done via consensus and to solidify this concept, to introduce the raft algorithm which is used on fabric?

C

After that some basic information on cryptography and security, so symmetric asymmetric cryptography? What is digital signature? How can we guarantee strong authentication authorization, accountability and to solidify these concepts? We present rsa rsa is not used on fabric it for digital signatures. It uses ecdsa, but rsa is quite an easy algorithm to understand, and it's typically used in universities to introduce these this area.

C

So we thought it was a good fit and, finally, to finish the introduction on blockchain, we implement a very simple python based blockchain, which we call blockchain for students, perhaps for the lack of a better name, and in this blockchain we it's a proof of workplace blockchain. We explain some of the concepts underlying watching.

C

So what is proof of work? How is the information structured? You know into blocks each block containing a hash to the previous block, and this way students can put their hands on the code and understand how how all those concepts are linked and how they can be leveraged to build a real watching. Let's say so. That was the first goal. The second goal is to introduce hyperledger fabric, talk a bit about the chain code, the infrastructure and finally, how to leverage all of this to build a full stack, decentralized application on fabric.

C

I should mention that, while we have lots of information on public blockchains, so how to structure smart contracts and the infrastructure and the decentralized applications on permission and blockchains, uh there are no, not so many examples.

C

So for these we have three labs. The first one introduces a use case that we implement with approacher fabric, which is essentially a system for students to provide feedback about professors and about courses.

C

Secondly, we elaborate on on that system and we implement smart contracts. We explain what are smart contracts and how can they fulfill the needs? The requirements for the use case that we propose we set up a simple version of the network of the infrastructure.

C

After that we leverage what we've learned before and we build a full stack, decentralized application. So the on-chain component, comprising the watching itself, the partition, the participants, the smart contracts and then the off-chain components which are basically web applications that contact with the blockchain.

C

Finally, we we had the last call for this internship, which, with which was to introduce ambra, hyperledger umbra hyperledger umbra, is another hyperledger lab project, which goal whose goal is to provide an emulation platform for several blockchains based on the mininet platform. So with umbra, you could set up in an easy way, a fabric network and study how each component reacts as a function of environmental environment variable. So, for instance, what happens if we drama dramatically reduce the the memory that is associated to the order appear?

C

What are what are the implications on transaction throughput on latency, for example, and these uh this platform allows to to make conclusions on how robust is our network and how we how we can leverage a stronger network?

C

Only two labs have been done. Actually, the second one was not finalized, because there were some dependencies that we were out of our reach to fulfill, but wipe seven introduces ampa. So it explains what it is. What are the simple commands that you can leverage to create a network with umbra and also a simple experiment.

C

So, regarding the structure, the project is hosted on github. We have guides instructor guides and support code. The guides are documents that can be used by the teaching staff, so professors people at companies etc for teach for teaching the students the contents of of the laboratory- that's that's the guy. The instructor's guide contains instructions on how to do it.

C

So while the guide is aimed for students to to to solve the instructor's guide, provides, hints and and the solutions to for the teaching staff and finally, the support folder contains all the support code that it's used on each of the labs.

C

This is web one. We we can see a guide in an instructor's guide, folder like at every lab and in the guide folder. You can see the content of of the lab. Currently we use latex to to define the contents.

C

Latex is a processing text, processing tool which is widely used for technical reports, academic papers etc, and we use this format because academics at universities are very used to this to this tool. While this is quite convenient, quite easy to use by academics, maybe perhaps it's not the most appropriate format to to expose on github. So one of the feature work directions is to migrate.

C

These latex documents into markdown, for example, so it's easier to access and then the support code here in lab6. In this example, we can see that this is a typical structure for a fabric application. We have the chain code folder, we have the test network, which was fought from the the samples repo we have the binaries, and then we have configurations and the specific.

C

Files for from our project, so every every lab is available. It was pre-tested by some of the contributors um and it's uh it's on good shape to be tested by a broader audience.

C

So this was great uh because we work in a in a small team. There are, there are already some contributors to the course which I I thank them once again um and, of course, this is an open source project. It's it's free, it's available that it is documented, so anyone who would like to leverage these these courses to contribute is greatly uh welcome.

C

There are some ways that you can uh leverage this course for for your on goals, which is consolidate the concepts on blockchain. If you want to learn a bit more, if you want to teach or to disseminate technology, and also it provides a good boilerplate for implementing hyperledger fabric-based apps, so it contains pretty much everything that you need for a solid proof of concept, at least so it contains the chain code. It contains a simple network. It contains a web application which is the basis for future work, uh as this course is very modular.

C

We can introduce other high project technology courses or even non-hyperledger technology courses modules- I I mean so for hyperledger cactus, which is the most recent hyperledger project dedicated to interoperability bezel in the area as well uh lots of technology that we could use here and add some theory. There are other ways to contribute and other, let's say, work categories for the course, but those are the main ones, uh and this is my presentation. Thank you, everyone for your attention and all will be glad to answer questions.

B

Okay, thank you ravi. ah Thank you, rafael for your presentation.

B

Yes, so I think one of my questions would be the conversion from latex to markdown, so I'm really used to to to latex for my university time, but I tried your course a little bit and and in your description it is uh descriptive that you have to use. We can use overleaf so and this works very well. I think, but uh I can't work it locally with my local setup from text studio this this. This doesn't works for me, but so it would be.

B

I think it would be great that if there is a conversion to markdown so that we can use it in a little bit easier way and uh yeah so, but you name you, you said it that you you work for in future. You will convert this course also to markdown, and I think it's a good good way to do this and okay are there any other questions.

C

Yeah, just to elaborate a bit on that, thank you roland for bringing that up. Definitely using overleaf. It's quite easy, but we shouldn't rely on, let's say external tools, to use the course right, and sometimes it's a bit cumbersome to.

B

C

Set up a local uh latex instantiation that can compile the the course because it has some dependencies on on external packages. So definitely markdown would be a much easier way for the the broad community to access the content.

C

However, there is also they are compiled, uh pdfs from the from each laboratory on the release, but this is not very scalable, so definitely it needs to be converted to markdown, eventually.

B

And maybe another question: do you know how many students use your course or how many universities use your cost.

C

Thank you at the moment. The the course was just finished a couple weeks ago and it's not 100 finished. Of course I've been talking to the hyperledger uh education materials working group and we are in the process of contacting universities to see if they're interested, but I would say definitely yes. Most of the blockchain courses. I've seen from universities are aimed for ethereum bitcoin public blockchains, and that is not so much material on enterprise blockchains and with the interest of watching raising up.

C

I think that eventually, courses like this one would be very useful for universities and for enterprises that need to teach enterprise blockchain.

B

Yeah, I think I think that's a good idea so and and it's true that there are not so many courses out there.

B

When you look at the linux foundation, there are some courses and but I didn't found any other courses in on the internet, for example, so, and I think most people want to start with the blockchain uh where I want to want to go into this blockchain world and they start with favorite and what I like on your course, I think is that it's a little bit more about the traditional blockchain or blockchain in general.

B

So when you start with fabric, then you learn a lot of how fabric how you can configure favorite in the script way- and maybe you don't know so much behind the technology.

B

You don't know how proof of work works, the content agreement works or the uh cryptographic, materials works and fabric ca or certified authority works. So um in this in this blockchain world there are a lot of technologies uh surround this uh blockchain and most courses only cover their specific items.

B

So also, when you look at the official hyperledger foundation, preparation course for the utm certification there, you have only specific items which are covered and there are not some surrounding technologies covered, and that makes some people which are new to this technology uh very difficult to introduce and or to start with this technology.

B

So, and I think it's a good idea to bring the people uh not from zero, but from a certain level uh a little bit closer to the specific elements of fabric for examples, or maybe also other blockchain types public.

C

B

C

I totally agree, I will just add a small comment. We try to make this course a bit wider, perhaps try to eliminate a bit the biased of balconies crypto.

C

So we try to cover a bit consensus proof of work raft which are quite different in our implementation of blockchain for students and then more the more enterprise vision like blockchains, and this allows to have a better foundation, I believe, to to learn new blockchains and when I started learning watching about three years ago, so not that long. I found it very very difficult to get into the space, um especially because fabric is evolving so so fast that it's pretty difficult to catch up and also there are not so many courses on fabric version.

C

Two, uh these one of the reasons that we decided to to use version. Two on this course.

B

Yes, yes, so, um okay! So um there's one question in the in the chat um why the dollar one fee. So what does this question mean.

A

uh No sorry, um the the one there is. The question was for jair joseph jones, who sent a link to a meetup group, but there is one I'm sorry I have. A question, though, um is the course available on coursera or the mooc platform, or are you going to build one of your own.

C

uh Hey omar, um no, currently, no currently we're, let's say the testing phase.

C

If, if it's to be on coursera, this version of the course it should be totally open, I'm not sure if, if that's possible, I think so, but currently it's only on on github. um Probably it would benefit from having some more modules and classes before it is scaled in that direction.

A

Okay, so you are building it still.

C

Yeah, well, it's very extensible, uh as in universities that teach in semesters can just pick two modules and even the labs from those modules. So there is really no limitation on how much content can be added and there is no strict, uh let's say flow for the labs. So the recommended is you to make to to go for a module one and then module two, but you can only do module one only module two! You can also do module two without doing module one.

C

So that's the idea that you, you learn what you need to learn. It's on a demand basis.

A

Okay, thank you.

B

Thank you, okay, so um thank you, rafael for your presentation and your contribution and.

D

B

I would like to switch over to ravi to his uh presentation and uh you're ready. Are we.

D

Yeah thanks roland I'm already one.

B

Yes, you're audible. You can start.

D

Yeah, that's a nice presentation. uh So probably definitely I'm going to be a part of your student in your university course so yeah! Well, uh okay, let me share my.

D

D

Is that my screen was viewable for all?

D

D

uh Good morning, good afternoon, good evening, all um thanks for giving this chance to present this my side project, so the story of the side project I would call out here is: I was learning a hyperledger, um so, while especially starting from fabric, I faced a lot of problems in configuring, the tools uh confirming the files so letters apart. Every time when I want to modify some parameters uh environment variables, I face a lot of issues lot of errors, so that puts me long a journey to learn.

D

But, yes, that is very good to learn, but uh that is what I thought of it: let's have a configurator tool, uh a simple way of configuration tool that uh you know just that: the simple modifications where we do a general uh minor uh as a human error. So that is what I created this tool as a side project.

D

Okay, uh especially this is going to be known.

A

For the um for the learners who, especially.

D

Wants to learn a hyperledger platform, so currently it is tested in hyperledger fabric, specifically in its three environments, uh with the different versions from 1.4.3 to 2.2.0 and the environment is single host environment and kubernetes and the docker of swamp.

D

So that's for the environments, it has been tested and it is that's why we tested it on this, for uh so it's all based developed using the cell scripting and python and ansible for the configuration modifications and we use the doppler compose templates as usual, that from the b by f1 and eif ones, there's other one that I have explained some time ago about this, how the byfl and uf, when I was working, it's also available in the gita proposition.

D

So it is a upgrade version of that and what you can do with this tool. uh Of course. Yes, you can change their domain name. However, you want to organization number of organizations, you can change organization name, you can change, you can define the orders, you can define order, names, peers and ces.

D

It is unlimited for all the numbers currently and unlimited channel names, and also you have a toggle between the versions between the raft and the solo versions and, as I said, uh it is tested, configuration in three environments, um single hosting and that performance communities- and I plan to do expand this in further. Under going forward on this tool.

D

uh So I think that's all about this from presentation point. So if you're all good, you can move to demo.

D

So I am going to log in this tool. I hope you all see my screen.

A

D

Okay, so so, once you log into this to this tool, uh it is a web enabled tool are using vide, so the username passwords are listed in the website here. If you go down, it is there, you can use this login name and the passwords.

D

Once you have this tool, uh you can log in and you can choose the frame. Currently it is available for the fabric, so you can generate the configurations.

D

So since uh you can choose any of these seven choices so currently, I am choosing um seven.

D

And I can say some domain names here: I'm going to use for coefficient is so I say kubernetes and I would say, default arcs. I it's a default. Everything comes with a by fn. That's why it took as a staging area and if you want to increase the numbers, definitely you can increase the numbers.

D

So I'm going to give a default here and a name you can again. You can give a name here.

D

Default peer count is.

D

And the kubernetes, I have have a template with a three node cluster for the demo purpose, so I am going to choose a three node uh order.

D

The order names are order: zero, one two and uh number of cs again: a template for two templates as I've created now because of in kubernetes. uh We have a two organization, so I each one will go to one cs: go to each organization.

D

A chain code for demo: it's a single chain code, a single, uh my channel.

D

So once you provided this configuration, uh it generates a configuration tool updates the two files config tx file- and you know crypto config file, along with your uh docker compose files.

D

So again, um for now it's again wrapped here we have a choice: to select the environment single host office for kubernetes. um You can again I'm going to do a kubernetes here, uh the name space for kubernetes, uh I use klr channel fabric and once you're done it will ask you a email. So you have. You can have to provide an email here so that the config will send in a zip format and or.

D

D

So it's it's a so now it will, uh it will generate and it will send the email. So if you look at the email, uh definitely it will be, uh you will be receiving it. So for this for the purpose I already saved the same configuration I already downloaded into my lab machine.

D

So you're able to see my screen.

A

D

So I hope that you able to see the fonts right. You are able to readable.

D

So I received that email and I already received this one generated- and I already downloaded that into my this lab machine. So this is a file that I receive over the email and to run this. uh There are two things currently, so you should your environment, linux, environment should uh double of prerequisites. um This tool also generates that so you have these.

A

D

So I downloaded I executed. The request is to install the docker.

D

So I'm going to create a directory here, k8 is demo and I'm going to pull this file.

A

D

Hey, can you can you go on mute? I think.

C

It's a background noise. We are receiving yeah. Thank you. I'm sorry.

D

Thank you. Thank you.

D

So I'm going to extract.

D

So you have these files, you have this screen, so you have all these files config for config and explorer creators configuration pod files. Okay- and this is the readme file. So if you do this source, uh read me so you it will give you it will give some instructions uh how to mount the volumes for the persistent data in the kubernetes environment.

D

So I'm going to give this as an environment.

D

And this will update my current folder structure and I also want to.

D

D

So I put that into the back hand uh one, so it will be mounted in that back end. So now you have all the files here now, if you look at here, uh it says that uh you have to start executing these commands, so initially it will click to clean up anything if it is there um and create a crypto uh artifacts right. So it's all. It's uh again look at here the readme file for the purpose. uh I just put all the environments here, all the scripts. Are there.

D

So for us I'm going to call the commander first, one is a clear and create.

D

So it executed that effects and the next is I'm going to do a replacement of keys, because um uh in two version it is uh the private key files are in the private key earlier it was a random numbers. So, of course you try to replace if you are running the different versions.

D

So the nexus I have to go and do a deployment. So, if you are, I mean, if you want to remove the commands, you always go tab and then the next one. So first I have done this and I have created replace the keys here and now I'm going to deploy the fonts.

D

So it will start uh generating the names namespace that we created and it will generate create a parts.

D

Now so uh this is currently, it is running and others are probably if you go and look um the logs probably may trying to download the images.

D

It's all executed now so so far.

D

Yeah very good, so all parts are, I would means, are downloaded and uh and was able to run now. So we are good in this now, so I am going to join the channel now.

D

So join this command call in this particular service, so it is going to join the channels.

D

Right so all the years I joined the channel, including order and also the ps0, was become anchored here now.

D

So next I'm going to so now what this template is going to be. Do it is going to execute the external uh chain code? That is what I have did this the kubernetes, so it the chain code will be a uh what is an exclusive. I mean exclusive of you know, docker container, which is uh I mean, the feature of version 2.

D

So before I uh start installing it I'm going to build the chain code container, so I'm going to build the chain core for.

D

Which is the chain code is currently some marbles. I got.

D

D

Okay, so the train code was built and its available images are available right and now I am going to install the chain.

D

D

Now the script is switching to uh r2 cli here, uh so once it's switching towards 2cla, it is again installing in the r2 as well I'm getting approved.

D

Yeah so now you can see uh the two organizations will get approved in this chain code.

D

So now I'm going to start sorry.

D

Yeah, I'm going to start the chain code. So now it's the chain code albums was getting deployed for my organization.

D

So here, if you look out here the message r2cc id, this is very important because once you install this cc id, this will be updated into the chain code containers for each container. So then, then that's where it is getting.

D

I mean the communication happens with the here and the chain code respectively.

D

Well, that's good! So, let's get executed.

D

So initially it was invoking the transactions and I was doing query from the organization one and the same thing. Now it is executing from the uh querying from the r2 so that you can see here um it was executing from the r2 and then it also executed uh the the another one was executed from the r2 here. This was executed and also querying it from the arc two.

D

So this is was done from the family point of view. Now, if you would like to start explorer as part of a package, you can also start.

D

D

Because the the motto of this, uh this part is completely the person who comes up from the beginning to learn hyperledger, so she should have complete package of it uh because he should be easily to understand. uh You know what are the things that you have to give it. The the changes versions commands everything. So if you go from the menu based uh from there, you can able to understand, from the fabric point of view to explorer and the caliber.

D

So that's a package that you can currently building out to understand the fabric, um one of the umbrella of hypocrites right.

D

D

D

Okay, so it's running now, so I'm just going to check it out so that it is able to connect to the network or not.

D

So yeah it's connected and started grabbing the blocks here you can see uh you can get that logs. So let's browse it uh before browsing. uh We come to note what is the services uh competence so currently I configured with the 31313 uh so for that uh I have this one. So if you look for just for it, we do the mini cube service explorer. um So you will get the service watch and users which was getting exported. I'm so sorry.

D

Sorry, it's not! It's all updates it's enough, so this is the port that we have to run um since uh this open to machine was running on the virtual machine on my windows laptop. So I'm not able to browse this from my laptop. So what I am going to do is uh I have already installed a headless firefox app in this uh ubuntu machine.

D

So for that I am going to use my uh x launch from the windows environment.

D

So if I'm going to use firefox.

A

Okay, let me put this at this.

A

A

A

D

uh Yes, fine, okay, why? This is not happening uh because uh I didn't export this booty session, so I'm going to open the new footy session. So this is I'm doing regularly. I'm doing these mistakes.

D

A

A

D

D

I'm going to run firefox.

D

D

Able to see my firefox screen.

A

D

Okay, so let me put because always this happens here, I'm going to private window, because some catchy is always there in the thing.

D

So if you look at this, so you will get the explorer you over here, so you can completely that's a package so the next time I was working out on the uh caliper that I'm going to integrate this and also working out on the multiple uh templates. That available are custom templates that you can mix around with your cookbooks.

D

It's all about uh this tool. uh Any questions.

B

Yeah, thank you ravi for this cool presentation, so I'm very express impressed and that's really cool work. I think so. I have tried your your your system in one week ago, but it it doesn't work for me and uh but I did I I did a mistake. I think so, but I think that's a really impressive project. You did so thank you for sharing this, and you know it's really really cool stuff. I think so.

B

Okay, so are there any question out there maybe to the kubernetes? So because this is this is new. I think so in our series here in the in this hyperledger study circle. We have always seen the docker or darker swarm, but we have no not kubernetes seen in action. So that's also cool that we have that you did this with the demonstration with kubernetes.

B

So it's maybe any question to this from the community.

A

Yes, um first, I would like to join everybody here. I think by and congratulate for all this impressive work. um I'm sure it will be of many uses if if it is publicly available, so the question is regarding the kubernetes or your invitation, is it production ready and the second question is in which language do you? uh Did you develop the this simplistic tool and is it open source, and how can we contribute?

A

So thank you again.

C

D

uh So the first question uh the kubernetes- it is- runs on the mini cube um so but the configuration that the the template that we have- yes, you can get it into your deployment to the production environment. Of course you have to do some uh changes according to your local environment, but it's a template. uh It is going to send you.

D

The tool is going to send you over the email and you can deploy whether you want to be uh applied on your local mini cube system or you can deploy it on any aws or you know, in your environment, in production, really environment. That's the one uh number two uh to the question. uh This tool is developed completely based on the shell, scripting, uh bashful, scripting and ansible and python.

D

uh These two three major components have been used for developing this tool. Third, uh for the contribution, of course, yes, uh I'm going to put that into these two uh open source uh into legit. I mean open sources this one. uh Before that I was optimizing this I was doing the optimization uh to answer the other question to uh uh land.

D

uh I was optimizing this tool, so there are some errors. What came in the last week? So that's where you may also end up something, but definitely it is I'm just fine tuning it and optimizing the script for the better performance and uh and also you're looking for the test cases and the contribution point of view and development point of view soon. This is this point. This tool is going to be available in the open source, dojita.

D

Is that answered your question.

A

um Yes, I, yes, it is.

A

D

You have that link over there for the github um it will going to be available in that same location. uh That's what I, uh whereas I waiting for uh people can do test and if they have any errors or issues or probably, if they open up some pr requests or something issues. uh So probably I can go and fix it and put that update. So that is what I was working out before uh before I update to open source. I want to.

A

D

Minor issues or major issues now, once that is done, uh definitely this tool is going to be available, open source.

A

But I'm sorry I didn't um heard from the is it bitton or python or is it go or something.

D

A

Understand he is a combination of bash scripting and other things, but mainly what's the orientation yeah.

D

So I also working out with hyperledger labs for this, so to put that, because of other frameworks that I'm planning out. um So yes, you can um it's that that tool and there's a question from um chat. I just posted that link.

D

Any other questions.

B

Okay, so if there are no questions anymore, then I have to say thank you to all uh contributors to rafael and ravi for this really really impressive session today and uh yeah. So I think we are good in time for for today and if no questions, then we can close this session today and we will see us again um on the next session.

B

Thank you for all and stay safe and stay at home.

A

Stay safe, see you thank you.

B

B