This document discusses blockchain, smart contracts, and cryptocurrencies. It begins with defining blockchain as a distributed digital ledger of transactions that provides a secure record. It then explains how cryptocurrencies derive economic value from principles of scarcity, difficulty to reproduce, and demand. Smart contracts are described as computer programs that automatically execute transactions according to predefined terms. The document demonstrates developing smart contracts on the Ethereum blockchain using the Solidity programming language. It discusses security considerations and provides code examples of simple smart contracts.
Intro to cryptography was part of a presentation showing problems that cryptography solves.
How to Communicate With Secret Messages?
How to Hide Message Existence?
How to Send Secure Emails?
and more...
Programming smart contracts in solidityEmanuel Mota
Ethereum Overview and what are Smart Contracts and what are their limitations. A Solidity programming language Crash Course. How to create an ERC20 token. What is an ICO on Ethereum.
Stefano Maestri - Blockchain and smart contracts, what they are and why you s...Codemotion
After a brief introduction on what is blockchain technology and how it works under the wood, focusing on Ethereum the next generation blockchain implementation. We will focus on the concept of smart contract introducing it through a simple case study and its standard implementation in ethereum. We will code it using Solidity language deploying and testing it in a live demo on Ethereum test network.
Intro to cryptography was part of a presentation showing problems that cryptography solves.
How to Communicate With Secret Messages?
How to Hide Message Existence?
How to Send Secure Emails?
and more...
Programming smart contracts in solidityEmanuel Mota
Ethereum Overview and what are Smart Contracts and what are their limitations. A Solidity programming language Crash Course. How to create an ERC20 token. What is an ICO on Ethereum.
Stefano Maestri - Blockchain and smart contracts, what they are and why you s...Codemotion
After a brief introduction on what is blockchain technology and how it works under the wood, focusing on Ethereum the next generation blockchain implementation. We will focus on the concept of smart contract introducing it through a simple case study and its standard implementation in ethereum. We will code it using Solidity language deploying and testing it in a live demo on Ethereum test network.
What is cryptography,its types,two algorithms i.e RSA and DES.
explained well and referenced the slide share too to give more precise presentation. Thank you.
Presentation slides for Introduction to bitcoin, blockchain and smart contracts for the workshop on Islamic Finance and Fintech in IIUM organized by KICT and IIiBF.
There are many cryptocurrencies out there; in fact, as of April 2021, there were over 9,500 cryptocurrencies in circulation listed on the Coinmarketcap. This number is expected to increase in the future as people’s interest in cryptocurrencies keeps rising. Although you might have heard about cryptocurrencies and known how it works, it’s possible you still don’t know what cryptocurrency actually is, or what means. The fields of cryptocurrency and the blockchain technology that drives cryptocurrencies can be a bit confusing. So, what is cryptocurrency? This article uses relatable terminology to explain in detail what cryptocurrency is, and the science of cryptography that decentralizes and drives cryptocurrencies, and makes them secure.
Decentralized: Blockchain & Cryptocurrency Laws in CanadaAlexander Davis
Blockchain technologies and cryptocurrencies are becoming more commonplace in Canada. This presentation presents an informational-purposes only overview of some of the laws governing them.
Daniel Connelly Ethereum Smart Contract Master's ThesisDaniel Connelly
Ethereum is a unique offshoot of blockchain technologies that incorporates the use of what are called smart contracts or Dapps – small-sized programs that orchestrate financial transactions on the Ethereum blockchain. With this fairly new paradigm in blockchain, however, comes a host of security concerns and a track record that reveals a history of losses in the range of millions of dollars. Since Ethereum is a decentralized entity, these concerns are not allayed as they are in typical financial institutions. For example, there is no Federal Deposit Insurance Corporation (FDIC) to back the investors of these contracts from financial loss as there is with bank depositors. Furthermore, there is also no Better Business Bureau (BBB) or Consumer Reports organization to offer any sort of ratings on these contracts.
However, there exists a well-known method for verifying a program’s integrity; a method called symbolic execution. Such an examination promises to give not only a perspective on the security of Ethereum, but also highlight areas where security experts may need to target to more quickly improve upon the security of this blockchain.
This paper proposes a solution to ensuring security and increasing end user confidence -- a digital registry of smart contracts that have security flaws in them. A rating system for contracts is proposed and the capabilities one has with knowledge of these vulnerabilities is examined. This research attempts to give a picture of the current state of security of Ethereum Smart Contracts by employing symbolic analysis on a portion of the Smart Contracts up until approximately the 8.4 millionth block.
Vulnerabilities in Smart Contracts may be prevalent and, if they are, a registry for enumerating which ones are can be built and potentially used to easily enumerate them.
With the recent crypto bubble engulfing the world, you would have come across two prominent words: Blockchain and Cryptocurrency. Well, when it comes to origin and development then cryptocurrency marks the growth of Blockchain technology.
What is a Cryptocurrency?
What is the Blockchain?
Why the Blockchain now?
Lets Sum this Blockchain!
Why the “Blockchain” is next IT revolution you have not heard of..
Lets talk about Careers in the Blockchain!
Simone Bronzini - Weaknesses of blockchain applications - Codemotion Milan 2018Codemotion
Due to the immutability of the ledger and the difficulty to update their consensus rules, Blockchain applications have many critical layers where a bug can cause huge, irreversible fund losses. This talk will shed some light on why and how Blockchain applications are so critical and will discuss past events that led to fund loss or consensus failures due to bugs in critical parts of the code of Bitcoin and Ethereum applications.
This is a set of lectures for the 7Gate academy boot camp. This covers a number of important topics in Cryptography that include secret key cryptography, public key cryptography, zero knowledge proofs, privacy, and anonymity. This is followed with a number of exercises in node.js.
CORRECTIONS
In page 14, replace "The public key can be announced with compromising security." with "The public key can be announced without compromising security."
BigDecimal: Avoid rounding errors on decimals in JavaScript (Node.TLV 2020)Igalia
By Daniel Ehrenberg.
Have you ever found yourself with a disappointing rounding error due to how Numb
ers work, or using awkward workarounds to avoid thinking about decimals? It's a
shame that JavaScript chose binary floating point as its basic numeric type when
it causes all of these problems. What can we do about it?
(c) Node.TLV 2020
https://www.nodetlv.com/
https://www.youtube.com/watch?v=G3Q4vWf8Peo
Blockchain technology is a distributed ledger platform that provides open and transparent transaction information with integrity and non-repudiation based on modern cryptography. It is also the technology behind many cryptocurrencies. This presentation will give fundamental knowledge on how blockchain works, its cryptography implementation, cryptocurrency definition and related terms and also blockchain use cases.
[Workshop] Getting Started with Cryptos, NFTs & Web 3.0 for Absolute BeginnersHessan Adnani
We are experiencing massive trends in Cryptos, NFTs, and Web 3.0 everywhere, and sooner or later, we all need to adapt to these new technologies. The DotCom Boom is repeating itself. We have two choices: to wait and be forced to learn about the Cryptos/NFTs when it's too late or to know it now and ride the current waves of opportunities.
In this workshop, we will get you started with Cryptos and NFTs, even if you're an absolute beginner with no technical background. We will be discussing:
The fundamentals of blockchain technology and how Cryptocurrencies, NFTs, and Web 3.0 work
Setting up your digital wallet
Understanding the Cryptos and NFTs markets
How to keep your assets safe and spot scams
How to buy and store cryptocurrency
How to buy your first NFT
How to spot opportunities
Essential investment mindset when it comes to the Crypto world
Crypto communities
And many more...
A blockchain is a decentralized and distributed digital ledger that is used to record transactions across many computers so that the record cannot be altered retroactively without the alteration of all subsequent blocks and the collusion of the network.
Best practices to build secure smart contractsGautam Anand
- Quick update in blockchain tech space
- Comparision between tech
- Security in Blockchain (Focusing on ETH Solidity attack vectors)
- Design patterns
- 2 Popular hacks (Case study)
In the middle of the blockchain hype it's easy to forget what the big words used to describe it really mean. It seems like a good idea to take a step back and consider the reasons behind using it. Perhaps in the vast selection of tools and ideas out there you can find something more suitable for your use case.
What is cryptography,its types,two algorithms i.e RSA and DES.
explained well and referenced the slide share too to give more precise presentation. Thank you.
Presentation slides for Introduction to bitcoin, blockchain and smart contracts for the workshop on Islamic Finance and Fintech in IIUM organized by KICT and IIiBF.
There are many cryptocurrencies out there; in fact, as of April 2021, there were over 9,500 cryptocurrencies in circulation listed on the Coinmarketcap. This number is expected to increase in the future as people’s interest in cryptocurrencies keeps rising. Although you might have heard about cryptocurrencies and known how it works, it’s possible you still don’t know what cryptocurrency actually is, or what means. The fields of cryptocurrency and the blockchain technology that drives cryptocurrencies can be a bit confusing. So, what is cryptocurrency? This article uses relatable terminology to explain in detail what cryptocurrency is, and the science of cryptography that decentralizes and drives cryptocurrencies, and makes them secure.
Decentralized: Blockchain & Cryptocurrency Laws in CanadaAlexander Davis
Blockchain technologies and cryptocurrencies are becoming more commonplace in Canada. This presentation presents an informational-purposes only overview of some of the laws governing them.
Daniel Connelly Ethereum Smart Contract Master's ThesisDaniel Connelly
Ethereum is a unique offshoot of blockchain technologies that incorporates the use of what are called smart contracts or Dapps – small-sized programs that orchestrate financial transactions on the Ethereum blockchain. With this fairly new paradigm in blockchain, however, comes a host of security concerns and a track record that reveals a history of losses in the range of millions of dollars. Since Ethereum is a decentralized entity, these concerns are not allayed as they are in typical financial institutions. For example, there is no Federal Deposit Insurance Corporation (FDIC) to back the investors of these contracts from financial loss as there is with bank depositors. Furthermore, there is also no Better Business Bureau (BBB) or Consumer Reports organization to offer any sort of ratings on these contracts.
However, there exists a well-known method for verifying a program’s integrity; a method called symbolic execution. Such an examination promises to give not only a perspective on the security of Ethereum, but also highlight areas where security experts may need to target to more quickly improve upon the security of this blockchain.
This paper proposes a solution to ensuring security and increasing end user confidence -- a digital registry of smart contracts that have security flaws in them. A rating system for contracts is proposed and the capabilities one has with knowledge of these vulnerabilities is examined. This research attempts to give a picture of the current state of security of Ethereum Smart Contracts by employing symbolic analysis on a portion of the Smart Contracts up until approximately the 8.4 millionth block.
Vulnerabilities in Smart Contracts may be prevalent and, if they are, a registry for enumerating which ones are can be built and potentially used to easily enumerate them.
With the recent crypto bubble engulfing the world, you would have come across two prominent words: Blockchain and Cryptocurrency. Well, when it comes to origin and development then cryptocurrency marks the growth of Blockchain technology.
What is a Cryptocurrency?
What is the Blockchain?
Why the Blockchain now?
Lets Sum this Blockchain!
Why the “Blockchain” is next IT revolution you have not heard of..
Lets talk about Careers in the Blockchain!
Simone Bronzini - Weaknesses of blockchain applications - Codemotion Milan 2018Codemotion
Due to the immutability of the ledger and the difficulty to update their consensus rules, Blockchain applications have many critical layers where a bug can cause huge, irreversible fund losses. This talk will shed some light on why and how Blockchain applications are so critical and will discuss past events that led to fund loss or consensus failures due to bugs in critical parts of the code of Bitcoin and Ethereum applications.
This is a set of lectures for the 7Gate academy boot camp. This covers a number of important topics in Cryptography that include secret key cryptography, public key cryptography, zero knowledge proofs, privacy, and anonymity. This is followed with a number of exercises in node.js.
CORRECTIONS
In page 14, replace "The public key can be announced with compromising security." with "The public key can be announced without compromising security."
BigDecimal: Avoid rounding errors on decimals in JavaScript (Node.TLV 2020)Igalia
By Daniel Ehrenberg.
Have you ever found yourself with a disappointing rounding error due to how Numb
ers work, or using awkward workarounds to avoid thinking about decimals? It's a
shame that JavaScript chose binary floating point as its basic numeric type when
it causes all of these problems. What can we do about it?
(c) Node.TLV 2020
https://www.nodetlv.com/
https://www.youtube.com/watch?v=G3Q4vWf8Peo
Blockchain technology is a distributed ledger platform that provides open and transparent transaction information with integrity and non-repudiation based on modern cryptography. It is also the technology behind many cryptocurrencies. This presentation will give fundamental knowledge on how blockchain works, its cryptography implementation, cryptocurrency definition and related terms and also blockchain use cases.
[Workshop] Getting Started with Cryptos, NFTs & Web 3.0 for Absolute BeginnersHessan Adnani
We are experiencing massive trends in Cryptos, NFTs, and Web 3.0 everywhere, and sooner or later, we all need to adapt to these new technologies. The DotCom Boom is repeating itself. We have two choices: to wait and be forced to learn about the Cryptos/NFTs when it's too late or to know it now and ride the current waves of opportunities.
In this workshop, we will get you started with Cryptos and NFTs, even if you're an absolute beginner with no technical background. We will be discussing:
The fundamentals of blockchain technology and how Cryptocurrencies, NFTs, and Web 3.0 work
Setting up your digital wallet
Understanding the Cryptos and NFTs markets
How to keep your assets safe and spot scams
How to buy and store cryptocurrency
How to buy your first NFT
How to spot opportunities
Essential investment mindset when it comes to the Crypto world
Crypto communities
And many more...
A blockchain is a decentralized and distributed digital ledger that is used to record transactions across many computers so that the record cannot be altered retroactively without the alteration of all subsequent blocks and the collusion of the network.
Best practices to build secure smart contractsGautam Anand
- Quick update in blockchain tech space
- Comparision between tech
- Security in Blockchain (Focusing on ETH Solidity attack vectors)
- Design patterns
- 2 Popular hacks (Case study)
In the middle of the blockchain hype it's easy to forget what the big words used to describe it really mean. It seems like a good idea to take a step back and consider the reasons behind using it. Perhaps in the vast selection of tools and ideas out there you can find something more suitable for your use case.
Stefano Maestri - Why Ethereum and other blockchains are going to Proof of St...Codemotion
Why do they want to leave Proof of Work? Which problems do they want to solve? Is PoS more or less democratic than PoW? Why is introducing PoS hard and risky? After a clear explanation of Pow and poS as general solution to bizantina problem in distributed trust less p2p systems, we will try to explore these themes giving something to reflect and hints to answer these question yourself.
By the end of this webinar you should be able to understand
The concepts, use cases and basics of smart contracts
How Blockchain and smart contracts work and developer success
How smart contracts work on both the Ethereum and Hyperledger platforms from a practical level
The constructs of smart contract, common coding requirements and demos
What are the most in demand Blockchain Certifications?
How do these certification meet the needs of todays Enterprises?
What about Blockchain Career Demand?
More info: https://blockchainhub.net/
Ethereum for Beginners: History of the Blockchain & Ethereum, Components, Outlook, Web 3.0, Serverless, Decetralized Universal World Computer
NFT & Blockchain seems to be hype to many; many are flipping and making crazy money, and some are buying monkey pics for millions of $! Why are notable brands(Nike, Gucci, JP Morgan, Snoop Dog, Nothing etc.) getting into this? Even Indian brands/celebs like Flipkart, Musicians are taking NFT and Metaverse route aggressively. What is going on? This session will cover the basics of NFT, web3, the types of NFT, some industry observations Abhinav had in the past ten months, the future of industry integrations, and how the enterprise can integrate better with them.
Web3’s red pill: Smashing Web3 transaction simulations for fun and profitTal Be'ery
The introduction of Web3 smart contracts has opened unlimited opportunities for decentralized apps (dApps) and users. With smart contracts, anything that can be coded can be deployed by anyone on the blockchain. As a result, in a Web3 environment, the users’ blockchain transactions, previously merely used for sending coins to peers, are now, in fact, Remote Procedure Calls (RPCs) for smart contracts.
The flip side of this expressiveness is that it’s almost impossible to know analytically in advance what would be the outcome of such RPC to an arbitrary smart contract. Attackers abuse this observability gap to trick users into signing transactions that are harmful in reality. This situation bears a close resemblance to the desktop environment: users need to evaluate in advance if a particular program behavior will be benign.
To solve this gap, Web3 security has taken a page out of the desktop’s security book by using a sandbox-style emulation to evaluate the transaction's outcome before it gets sent to the blockchain. In Web3 lingo, such sandbox emulation is referred to as transaction simulation.
In this talk, we will present our newly discovered attack methods against Web3 simulations, including the first-ever Web3 red pill exploits that allow smart contracts to know that they are running in a simulation and as a result, need to behave differently.
We have tested our findings against numerous leading simulation providers in the Ethereum Virtual Machine (EVM) domain and found that they are indeed vulnerable to such attacks. As a result of our responsible disclosure, multiple (currently three) issues were fixed, and we were awarded bug bounties. We will explain these exploits in detail, including the research methodology allowing us to inspect simulators’ inaccessible inner workings.
We will conclude with new and enlightening insights we gained through this research regarding the true capabilities and limitations of Web3 simulations.
From Crypto Kitties to non fungible token to ERC721 standardmaeste
A bright future for non-fungible tokens in blockchain world. Last January we have seen a new phenomenon in cryptocurrency world: crypto kitties. Everyone in blockchain world would like to buy one, but Kitties was important not only for their popularity but even more for their technology, which started a new kind of token. We will see what a non-fungible token is, its standard ERC721 and its bright future and infinite applications they could have in blockchain world.
Webinar: From Crypto Kitties to non fungible token to ERC721 standard - Stefa...Codemotion
A bright future for non fungible token in blockchain world. Last January we have seen a new phenomenon in cryptocurrency world: crypto kitties. Everyone in blockchain world would like to buy one, but most important also people who don't know what is an ether was talking about (Radio DJ for example). But Kitties was important not only for their popularity but even more for their technology, which started a new kind of token.
We will talk about what is a non fungible token, its standard ERC721 and its bright future and infinite applications they could have in blockchain world.
Custom Healthcare Software for Managing Chronic Conditions and Remote Patient...Mind IT Systems
Healthcare providers often struggle with the complexities of chronic conditions and remote patient monitoring, as each patient requires personalized care and ongoing monitoring. Off-the-shelf solutions may not meet these diverse needs, leading to inefficiencies and gaps in care. It’s here, custom healthcare software offers a tailored solution, ensuring improved care and effectiveness.
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
Launch Your Streaming Platforms in MinutesRoshan Dwivedi
The claim of launching a streaming platform in minutes might be a bit of an exaggeration, but there are services that can significantly streamline the process. Here's a breakdown:
Pros of Speedy Streaming Platform Launch Services:
No coding required: These services often use drag-and-drop interfaces or pre-built templates, eliminating the need for programming knowledge.
Faster setup: Compared to building from scratch, these platforms can get you up and running much quicker.
All-in-one solutions: Many services offer features like content management systems (CMS), video players, and monetization tools, reducing the need for multiple integrations.
Things to Consider:
Limited customization: These platforms may offer less flexibility in design and functionality compared to custom-built solutions.
Scalability: As your audience grows, you might need to upgrade to a more robust platform or encounter limitations with the "quick launch" option.
Features: Carefully evaluate which features are included and if they meet your specific needs (e.g., live streaming, subscription options).
Examples of Services for Launching Streaming Platforms:
Muvi [muvi com]
Uscreen [usencreen tv]
Alternatives to Consider:
Existing Streaming platforms: Platforms like YouTube or Twitch might be suitable for basic streaming needs, though monetization options might be limited.
Custom Development: While more time-consuming, custom development offers the most control and flexibility for your platform.
Overall, launching a streaming platform in minutes might not be entirely realistic, but these services can significantly speed up the process compared to building from scratch. Carefully consider your needs and budget when choosing the best option for you.
Prosigns: Transforming Business with Tailored Technology SolutionsProsigns
Unlocking Business Potential: Tailored Technology Solutions by Prosigns
Discover how Prosigns, a leading technology solutions provider, partners with businesses to drive innovation and success. Our presentation showcases our comprehensive range of services, including custom software development, web and mobile app development, AI & ML solutions, blockchain integration, DevOps services, and Microsoft Dynamics 365 support.
Custom Software Development: Prosigns specializes in creating bespoke software solutions that cater to your unique business needs. Our team of experts works closely with you to understand your requirements and deliver tailor-made software that enhances efficiency and drives growth.
Web and Mobile App Development: From responsive websites to intuitive mobile applications, Prosigns develops cutting-edge solutions that engage users and deliver seamless experiences across devices.
AI & ML Solutions: Harnessing the power of Artificial Intelligence and Machine Learning, Prosigns provides smart solutions that automate processes, provide valuable insights, and drive informed decision-making.
Blockchain Integration: Prosigns offers comprehensive blockchain solutions, including development, integration, and consulting services, enabling businesses to leverage blockchain technology for enhanced security, transparency, and efficiency.
DevOps Services: Prosigns' DevOps services streamline development and operations processes, ensuring faster and more reliable software delivery through automation and continuous integration.
Microsoft Dynamics 365 Support: Prosigns provides comprehensive support and maintenance services for Microsoft Dynamics 365, ensuring your system is always up-to-date, secure, and running smoothly.
Learn how our collaborative approach and dedication to excellence help businesses achieve their goals and stay ahead in today's digital landscape. From concept to deployment, Prosigns is your trusted partner for transforming ideas into reality and unlocking the full potential of your business.
Join us on a journey of innovation and growth. Let's partner for success with Prosigns.
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
👉👉 Click Here To Get More Info 👇👇
https://sumonreview.com/ai-pilot-review/
AI Pilot Review: Key Features
✅Deploy AI expert bots in Any Niche With Just A Click
✅With one keyword, generate complete funnels, websites, landing pages, and more.
✅More than 85 AI features are included in the AI pilot.
✅No setup or configuration; use your voice (like Siri) to do whatever you want.
✅You Can Use AI Pilot To Create your version of AI Pilot And Charge People For It…
✅ZERO Manual Work With AI Pilot. Never write, Design, Or Code Again.
✅ZERO Limits On Features Or Usages
✅Use Our AI-powered Traffic To Get Hundreds Of Customers
✅No Complicated Setup: Get Up And Running In 2 Minutes
✅99.99% Up-Time Guaranteed
✅30 Days Money-Back Guarantee
✅ZERO Upfront Cost
See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
Gamify Your Mind; The Secret Sauce to Delivering Success, Continuously Improv...Shahin Sheidaei
Games are powerful teaching tools, fostering hands-on engagement and fun. But they require careful consideration to succeed. Join me to explore factors in running and selecting games, ensuring they serve as effective teaching tools. Learn to maintain focus on learning objectives while playing, and how to measure the ROI of gaming in education. Discover strategies for pitching gaming to leadership. This session offers insights, tips, and examples for coaches, team leads, and enterprise leaders seeking to teach from simple to complex concepts.
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
Event sourcing, which records state changes as immutable events, provided robust auditing and "time travel" debugging for Wix Stores' microservices. Despite its benefits, the complexity it introduced in state management slowed development. Wix responded by adopting a simpler, unified CRUD model. This talk will explore the challenges of event sourcing and the advantages of Wix's new "CRUD on steroids" approach, which streamlines API integration and domain event management while preserving data integrity and system resilience.
Participants will gain valuable insights into Wix's strategies for ensuring atomicity in database updates and event production, as well as caching, materialization, and performance optimization techniques within a distributed system.
Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
GraphSummit Paris - The art of the possible with Graph TechnologyNeo4j
Sudhir Hasbe, Chief Product Officer, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Enhancing Research Orchestration Capabilities at ORNL.pdfGlobus
Cross-facility research orchestration comes with ever-changing constraints regarding the availability and suitability of various compute and data resources. In short, a flexible data and processing fabric is needed to enable the dynamic redirection of data and compute tasks throughout the lifecycle of an experiment. In this talk, we illustrate how we easily leveraged Globus services to instrument the ACE research testbed at the Oak Ridge Leadership Computing Facility with flexible data and task orchestration capabilities.
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Understanding Globus Data Transfers with NetSageGlobus
NetSage is an open privacy-aware network measurement, analysis, and visualization service designed to help end-users visualize and reason about large data transfers. NetSage traditionally has used a combination of passive measurements, including SNMP and flow data, as well as active measurements, mainly perfSONAR, to provide longitudinal network performance data visualization. It has been deployed by dozens of networks world wide, and is supported domestically by the Engagement and Performance Operations Center (EPOC), NSF #2328479. We have recently expanded the NetSage data sources to include logs for Globus data transfers, following the same privacy-preserving approach as for Flow data. Using the logs for the Texas Advanced Computing Center (TACC) as an example, this talk will walk through several different example use cases that NetSage can answer, including: Who is using Globus to share data with my institution, and what kind of performance are they able to achieve? How many transfers has Globus supported for us? Which sites are we sharing the most data with, and how is that changing over time? How is my site using Globus to move data internally, and what kind of performance do we see for those transfers? What percentage of data transfers at my institution used Globus, and how did the overall data transfer performance compare to the Globus users?
In the ever-evolving landscape of technology, enterprise software development is undergoing a significant transformation. Traditional coding methods are being challenged by innovative no-code solutions, which promise to streamline and democratize the software development process.
This shift is particularly impactful for enterprises, which require robust, scalable, and efficient software to manage their operations. In this article, we will explore the various facets of enterprise software development with no-code solutions, examining their benefits, challenges, and the future potential they hold.
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
Listen to the keynote address and hear about the latest developments from Rachana Ananthakrishnan and Ian Foster who review the updates to the Globus Platform and Service, and the relevance of Globus to the scientific community as an automation platform to accelerate scientific discovery.
Blockchain and smart contracts, what they are and why you should really care about as a developer
1. Title: Blockchain and smart contractsWhat they are and why you should really care about ad developer
Author: @maeste, Stefano Maestri
CODEMOTION MILAN - SPECIAL EDITION
10 – 11 NOVEMBER 2017
2. Who is Stefano?
● A young enthusiast open source developer
● Red Hat Principal software engineer
● https://www.linkedin.com/in/maeste/
● https://twitter.com/maeste
● https://github.com/maeste/
● http://www.onchain.it/
My matching pairs game: Java & JBoss, Open Source & Red Hat,
Blockchain & Ethereum
3. Who is Stefano?
● A young enthusiast open source developer
● Red Hat Principal software engineer
● https://www.linkedin.com/in/maeste/
● https://twitter.com/maeste
● https://github.com/maeste/
● http://www.onchain.it/
My matching pairs game: Java & JBoss, Open Source & Red Hat,
Blockchain & Ethereum
4. Today’s Agenda
● Brief introduction to blockchain concepts
● Cryptocurrencies and why they have monetary value
● Smart contracts and why you should care about
● Developing smart contracts on ethereum blockchain
5. What is the block chain?
The Guardian: Blockchain is a digital ledger that provides a
secure way of making and recording transactions,
agreements and contracts – anything that needs to be
recorded and verified as having taken place.
Wikipedia: A blockchain is a continuously growing list of records,
called blocks, which are linked and secured using cryptography.
Each block typically contains a hash pointer as a link to a previous
block, a timestamp and transaction data. By design, blockchains
are inherently resistant to modification of the data. A blockchain
can serve as "an open, distributed ledger that can record
transactions between two parties efficiently and in a verifiable and
permanent way."
6. What is a blockchain...a nice bullet list
● It’s a ledger of transactions and datas
● It’s persistent, secure and unmodifiable
● It’s based on computational trust
● It’s distributed and unstoppable
● Transaction parties are anonymous, but tx are public and verifiable
● It’s transactions could be about values (cryptocurrency)
● It’s trustless about nodes and users
7. What is a blockchain...a nice bullet list
● It’s a ledger of transactions and datas
● It’s persistent, secure and unmodifiable
● It’s based on computational trust
● It’s distributed and unstoppable
● Transaction parties are anonymous, but tx are public and verifiable
● It’s transactions could be about values (cryptocurrency)
● It’s trustless about nodes and users
Live Demo
11. Has those cryptocurrencies a real economic
value? And why?
In economy “intrinsic value” concept doesn’t exist at all. We give value to money
by convention, and more general anything gain value almost for 3 reasons (not
strictly needed, but true in almost cases at least)
● It’s rare
● It’s hard to reproduce
● It could be exchanged
● Someone want to buy it (law of supply and demand)
12. Has those cryptocurrencies a real economic
value? And why?
In economy “intrinsic value” concept doesn’t exist at all. We give value to money
by convention, and more general anything gain value almost for 3 reasons (not
strictly needed, but true in almost cases at least)
● It’s rare
● It’s hard to reproduce
● It could be exchanged
● Someone want to buy it (law of supply and demand)
1 Euro
Fontana’s paint ~ 8M Euro
~ 7K Euro Manzoni’s artist's shit: ~275K Euro
17. So...what is the solution?
Grandmum solution?
Could be at least unpractical...
18. The solution is the blockchain
● It’s a ledger of transactions and datas
● It’s persistent and secure
● It’s based on computational trust
● It’s distributed and unstoppable
● Transaction parties are anonymous, but transactions are public
● It’s transactions could be about values (cryptocurrency)
● It’s trustless about nodes and users
19. The solution is the blockchain
● It’s a ledger of transactions and datas
● It’s persistent and secure
● It’s based on computational trust
● It’s distributed and unstoppable
● Transaction parties are anonymous, but transactions are public
● It’s transactions could be about values (cryptocurrency)
● It’s trustless about nodes and users
Am I going to transfer my money without trusting anyone?
20. What does trustless mean?
You are not trusting in peers of transaction or even in nodes of the network, you
are trusting in the protocol itself. In other words you are trusting blockchain and
cryptocurrency itself and not people owning them….moreover they are
anonymous…
Does it recall anything you well known and use everyday?
21. What does trustless mean?
You are not trusting in peers of transaction or even in nodes of the network, you
are trusting in the protocol itself. In other words you are trusting blockchain and
cryptocurrency itself and not people owning them….moreover they are
anonymous…
Does it recall anything you well known and use everyday?
22. What does trustless mean?
You are not trusting in peers of transaction or even in nodes of the network, you
are trusting in the protocol itself. In other words you are trusting blockchain and
cryptocurrency itself and not people owning them….moreover they are
anonymous…
Does it recall anything you well known and use everyday?
24. What is a smart contract?
A contract is a voluntary arrangement between two or more
parties that is enforceable by law as a binding legal
agreement
A smart contract is a computer protocol intended to facilitate,
verify, or enforce the negotiation or performance of a
contract.
25. Real world smart contracts
With the present implementations]
"smart contract" is
general purpose computation that takes place on a
blockchain
27. Ethereum: a blockchain for smart contracts
● Every node run a built in Virtual Machine (EVM)
● It provide a compiler from high level languages to EVM
● 2 different kind of accounts:
○ Externally owned account (EOAs), controlled by
private keys
○ Contract accounts, controlled by code
28. Ethereum Virtual Machine
Internals
● TURING COMPLETE VM
● Stack based byte code (push,
jump)
● Memory
● Storage
● Environment variables
● Logs
● Sub-calling
High level languages
● Solidity (c-like)
● Viper (python like)
● LLL (lisp inspired)
● Bamboo (experimental
morphing language influenced
by Erlang)
Everyone compiling to EVM code
29. EVM code execution
● Transaction sent to a contract address
● Every full node of ethereum run the code at this address
and store the state
● Smart contract code can:
○ Could run any program (turing complete machine)
○ Read/write state
○ Call another contract
○ Send ETH to other address (both EOA and contract)
30. Ethereum GAS
Halting problem: determine if the program will finish running or continue to run
forever. Classic NP-hard problem
Ethereum solution: GAS, a fee per computational step
GAS is not a currency is just a unit of measurement of computational step
In Tx you have “maximum GAS” you would give to the miner and “GAS price” to
determine how much you will actually pay.
If Tx complete successfully you pay just for effective GAS used.
It the Tx would consume all GAS the TX will be revert, but you still pay for GAS
Ethereum hasn’t block size limit, but Gas Limit (6.7M currently, but voted by miners)
31. Solidity
● C/Java-like syntax
● Statically typed
● Support inheritance (multiple)
● Complex user defined types (struct)
● Polymorphism
● Overriding
● …..
http://solidity.readthedocs.io/en/develop/index.html#
32. Our development environment
● testRPC (local in memory ethereum blockchain)
● Truffle (maven-like tool to compile and deploy contract)
● A bit of javascript (npm) for some raw Dapp interface
● Metamask to inject ethereum protocol in our
html/javascript Dapp
● Intellij to edit solidity and javascript
More info: http://truffleframework.com/
33. SmartNotary
● The easiest contract notarizing a document
● Receiving document hash and owner name It will write them in the
blockchain state
● Giving the hash it will return the owner name
● It’s a pet project just to play with code
Talk is cheap….show me the f****ing code (Linus Torvalds)
https://github.com/onchainit/SmartNotary/tree/baseExample
34. SmartNotary 1.1: using EOA
We are using current EOA (from metamask) as owner.
It will give us the opportunity to play a bit with metamask
https://github.com/onchainit/SmartNotary/tree/baseExample
35. SmartNotary 2.0: paying for notarization
We are adding money transfer.
Basically the user will pay in ether the service of
notarization.
The ethers are stored in contract balance, and only contract
creator could withdraw them in his EOA
https://github.com/onchainit/SmartNotary/tree/pay4Notarization
36. Contract security - reentrancy attack
// INSECURE
mapping (address => uint) private userBalances;
function withdrawBalance() public {
uint amountToWithdraw = userBalances[msg.sender];
require(msg.sender.call.value(amountToWithdraw)());
// At this point, the caller's code is executed, and can call withdrawBalance again
userBalances[msg.sender] = 0;
}
https://consensys.github.io/smart-contract-best-practices/
37. Contract security - reentrancy attack
// VERY SIMPLIFIED MALICIOUS CODE (WOULD NEED CONSIDERATION ON BLOCK MAXIMUM GAS)
function() payable {
vulnerable.withDraw();
}
38. Contract security -reentrancy attack solution
mapping (address => uint) private userBalances;
function withdrawBalance() public {
uint amountToWithdraw = userBalances[msg.sender];
userBalances[msg.sender] = 0;
require(msg.sender.call.value(amountToWithdraw)());
// The user's balance is already 0, so future invocations won't withdraw anything
}
Or just using primitive send() instead of .call.value which limit gas to 2300 (pure
transfer)
https://consensys.github.io/smart-contract-best-practices/
39. SmartNotary 3.0: paying for notarization and
notarized document market
A bit more complex example
More money transfer
Blind auction
https://github.com/onchainit/SmartNotary/tree/marketplace
40. Who is behind ethereum?
A Very young….extremely focused guy
41. Who is behind ethereum?
A Very young….extremely focused guy
Don’t you recall another very young
extremely focused guy?