Shawn Tabrizi, Lead Developer at Parity Technologies, shared his keynote presentation and introduced JAM in front of blockchain developers using Polkadot, a layer 0 protocol launched by Gavin Wood, one of the founders of the Ethereum blockchain.
- Tabrizi gave his keynote presentation on JAM during sub0, a three-day conference for Polkadot developers held November 9-11, 2024 in Bangkok, Thailand.
In focus: Join-Accumulate Machine (JAM) represents a possible design to succeed a relay chain on Polkadot. Its name comes from CoreJAM, or Collect Refine Join Accumulate, which describes the computing model that represents the machine as first described by Wood.
- According to Polkadot, JAM will be a domain-specific chain that handles a particular problem domain, which in this case is rollups. Technically, JAM makes Polkadot, a highly domain-specific rollup chain, less opinionated and more generic.
- worth reading: Learn more about Polkadot, its history, how it works, and its $DOT token in this BitPinas article.
The following extract Tabrizi’s keynote focuses on his presentation about JAM, how it relates to Polkadot, and how it helps Polkadot offer a better platform for decentralized application developers.
- Also, The recap of the November 11, 2024 sub0 event covered by BitPinas is on the final page of the article.
Keynote speech by Polkadot’s Shawn Tabrizi

Shawn Tabrizi, Lead Developer, Polkadot: So, this is what my presentation will be about. This will be how JAM changes that future for web3 application development.
In fact, there are a lot of really interesting narratives surrounding JAM. There are so many interesting things to talk about with JAM that are super technical. But I think there’s actually an even cooler narrative than all of this that I would like everyone to have imprinted in their head and that is, I think, the most important narrative is that JAM evolves Polkadot from hosting just blockchains to a Platform to host any application or web service3.
Tabriz: JAM is no longer just about blockchains. Polkadot is no longer just about blockchains. These are web applications and services3. So let’s take a look at that idea. Do you know what JAM and Polkadot is? I think a lot of people have confusion about, like you know, is JAM something new or different or a change? What is the relationship? For that? We need to start with the basics.
How is JAM related to Polkadot?
Tabriz: I want to argue that Polkadot is not just a blockchain. Now, Polkadot has a blockchain, it has a token. But I really think that when you say Polkadot, when we talk about the people in this room, the meaning, that logo, we’re actually talking about a vision, a vision towards a world with less trust and more truth. That’s really what we’re trying to do here.
I mean, we obviously recognize the fact that you can’t change the world just with technology. That alone is not going to do anything. You need many other factors here. But I think we really believe that the first primitive element that really allows us to start this path is through technology.
And that’s why there’s so much excitement around the blockchain space, and this is really the starting point of how you would like to build and get into this world. But remember, it’s not the end. There is a lot of work to be done over and over again, which is why Polkadot is not just about blockchains. It’s a vision. There are many more steps after we have solved this blockchain scaling problem to achieve this new world.
So what is Polkadot’s mission right now? Well, our current mission is to build that technology, that is, to provide a scalable, secure and resilient platform for web3 applications and services. Okay, and that’s really it. We have been building the relay chain, all the work so far, JAM, is already done, building this first technological primitive.

JAM as a solution
Tabriz: But taking all this into account, there are still limitations. You could scale a blockchain as much as you want, but there is a fundamental limit to the fact that a blockchain is a blockchain, that a block itself can only run so much in one type of time window, TRUE?
So whenever you’re building an application, whenever you’re designing something, you have a fundamental limitation, even if your blockchain can scale to millions of transactions, that it can only run within the scope of one block, and this is a big limitation. for application developers. Blockchain development has always been a specialized practice, right? This achieves yet another barrier to achieving this world with less trust and more truth. If we could make building applications for blockchains much simpler, we would actually open and accelerate our path to this future world. That’s why I want to argue that JAM solves this problem, and specifically with this PVM, the new virtual machine environment within JAM. Okay, let’s get into it.
Presenting the PVM is very exciting. You’ve been hearing a little about that. It is based on RISC-V, it is easy to transpile to all common hardware. It runs very very fast, almost at native speeds, has all the tools you would expect from a good developer environment, cheap gas, metering, fast compilation and much more. There’s a whole presentation we could do just on the PVM and there are videos. You should actually search the internet if they have it.

How JAM helps build the Polkadot cloud
Tabriz: So the old paradigm of blockchain application development is that you have to split the application. You should be aware that you are building on a blockchain. Break everything up, shove it into individual blocks in a nasty way. The way it should be, and has been, is that you simply build an application, deploy it to some kind of cloud server, and just run it.
And the JAM way is exactly that we can abstract from you the fact that you just create an application, deploy it to our cloud, and we’ll break it down using continuations, using PVM, and this multi-step state transition function. flow. Really, you can see how Polkadot is just a web3 cloud and always has been.

Tabriz: We’ve been moving towards this vision, so I really want to introduce you now, with JAM, the Polkadot cloud. Polkadot cloud is the mission. It is the secure, scalable and resilient platform for web3 applications and services. It has all the different web3 services you would expect from a cloud provider. It has decentralized execution, settlement and finality, data availability, object storage, blockchain hosting services, smart contract hosting services.
These are all things you would expect from a cloud provider. These are the things that we’ve been providing all along, but we’ve been putting them together and talking about parachains, a little talk about blockchains, but JAM takes us to a new state where it’s not just about blockchains anymore. It is about any type of application accessing and using these services in the web3 cloud.
The Polkadot cloud has crazy specs: it will have over a thousand validators, 341 cores, a Nakamoto coefficient of over 300, 85 times a single CPU load, 852 megabytes of input and output bandwidth, two petabytes of data availability. data, more than a million transactions per second. . This sounds like the kind of platform you’d like to deploy your web3 application on, one that really suits your needs.

Final thoughts
Tabriz: Actually, what I want to say is that Polkadot with Jam is the web3 Internet that you were promised. How many blockchains are there out there that tell you oh, we are going to change the Internet, we are going to make a web3 Internet, but they are all just for blockchains, but for any type of application that wants to absorb the resilience, the strength, the decentralization of a web service3.
So yes, JAM, in a sentence, JAM evolves into Polkadot. So that’s the beginning from a hosting, just blockchains to a platform to host any type of web3 application or service, and really the even simpler sentences Jam is the beginning of the Polkadot cloud, so what I wanted to do I want to take this opportunity to really start a discussion.
I’m sure there are a lot of app developers out there, right, and people who are building a combination of services or apps directly in the cloud, who are thinking about the future of their peer chain and answering any questions about how and how they could change the way you think about the Polkadot cloud and its applications.

Continue following BitPinas for interviews and speeches from people advancing the crypto industry in the Philippines.
Event summary: sub0 Day 3
[November 11, 2024, 3:16 p.m., PH Time] Now ongoing: Polkadot sub0 developer conference in Bangkok, Thailand.
This is a three-day immersion and summit of like-minded developers, builders and visionaries, united to build the future on Substrate & Polkadot SDK.

Kian Paimani offered a basic explanation of Polkadot 1.0, Polkadot 2.0, and how everything will evolve through JAM.

Brian Chen discusses how, by leveraging the capabilities of JAM, Acala Network will aim to simplify DeFi interactions and drive widespread adoption in the decentralized space.

Shawn Tabrizi discusses and interacts with the audience on how JAM changes the paradigm of not needing to build blockchain-based applications in web3.

This article is published on BitPinas: Top clip: Polkadot’s Shawn Tabrizi presents Web3 Cloud JAM
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