ArcBlock Technical Learning Series Presents Understanding HD Wallets. This talk will look at the building blocks to creating a virtual currency wallet including some of the basic design ideas, and implementation methods.
The Blockchain - The Technology behind Bitcoin Jérôme Kehrli
The blockchain and blockchain related topics are becoming increasingly discussed and studied nowadays. There is not one single day where I don't hear about it, that being on linkedin or elsewhere.
I interested myself deeply in the blockchain topic recently and this is the first article of a coming whole serie around the blockchain.
This presentation is an introduction to the blockchain, presents what it is in the light of its initial deployment in the Bitcoin project as well as all technical details and architecture concerns behind it.
We won't focus here on business applications aside from what is required to present the blockchain purpose, more concrete business applications and evolutions will be the topic of another presentation I'll post in a few weeks
Understanding Proof of Work (PoW) and Proof of Stake (PoS) AlgorithmsGautam Anand
We will focus on understanding "Proof of Stake (PoS)" Algorithm, how it different from "Proof of Work" algorithm, the performance benefits and security overview. We will also discuss the upcoming blockchain protocols that are planning to move to PoS.
This presentation shows the evolution of blockchain implementations from simple financial transactions to complex computer programs (i.e. Smart Contracts)
Ethereum at its simplest, is an open software platform based on blockchain technology
Ethereum allows developers to build and deploy decentralized applications.
The Blockchain - The Technology behind Bitcoin Jérôme Kehrli
The blockchain and blockchain related topics are becoming increasingly discussed and studied nowadays. There is not one single day where I don't hear about it, that being on linkedin or elsewhere.
I interested myself deeply in the blockchain topic recently and this is the first article of a coming whole serie around the blockchain.
This presentation is an introduction to the blockchain, presents what it is in the light of its initial deployment in the Bitcoin project as well as all technical details and architecture concerns behind it.
We won't focus here on business applications aside from what is required to present the blockchain purpose, more concrete business applications and evolutions will be the topic of another presentation I'll post in a few weeks
Understanding Proof of Work (PoW) and Proof of Stake (PoS) AlgorithmsGautam Anand
We will focus on understanding "Proof of Stake (PoS)" Algorithm, how it different from "Proof of Work" algorithm, the performance benefits and security overview. We will also discuss the upcoming blockchain protocols that are planning to move to PoS.
This presentation shows the evolution of blockchain implementations from simple financial transactions to complex computer programs (i.e. Smart Contracts)
Ethereum at its simplest, is an open software platform based on blockchain technology
Ethereum allows developers to build and deploy decentralized applications.
Blockchain Interview Questions And Answers | Blockchain Technology Interview ...Simplilearn
This presentation on "Blockchain Interview Questions And Answers" will help you prepare for Blockchain engineer interviews. This video is ideal for both beginners as well as professionals who are appearing for Blockchain interviews. Once you’ve lined up a job interview with a potential employer, you’ll have an opportunity to study that particular organization and their use of Blockchain technology. That can help you to prepare for specific Blockchain interview questions relevant to that employer. Until then, you can prepare for more general Blockchain interview questions by knowing how to demonstrate your broader knowledge of the implications and applications of Blockchain Technology. Learn what are the most important Blockchain interview questions and answers and know what will set you apart in the interview process.
Simplilearn’s Blockchain Certification Training has been designed for developers who want to decipher the global craze surrounding Blockchain, Bitcoin and cryptocurrencies. You’ll learn the core structure and technical mechanisms of Bitcoin, Ethereum, Hyperledger and Multichain Blockchain platforms, use the latest tools to build Blockchain applications, set up your own private Blockchain, deploy smart contracts on Ethereum and gain practical experience with real-world projects.
Why learn Blockchain?
Blockchain technology is the brainchild of Satoshi Nakamoto, which enables digital information to be distributed. A network of computing nodes makes up the Blockchain. Durability, robustness, success rate, transparency, incorruptibility are some of the enticing characteristics of Blockchain. By design, Blockchain is a decentralized technology which is used by a global network of the computer to manage Bitcoin transactions easily. Many new business applications will result in the usage of Blockchain such as Crowdfunding, smart contracts, supply chain auditing, etc.
This Blockchain Certification course offers a hands-on training covering relevant topics in cryptocurrency and the wider Blockchain space. From a technological standpoint, you will develop a strong grasp of core Blockchain platforms, understand what Bitcoin is and how it works, learn key vocabulary and concepts commonly used when discussing Blockchain and understand why engineers are motivated to create an app with Ethereum.
The Blockchain Certification Training Course is recommended for:
1. Developers
2. Technologists interested in learning Ethereum, Hyperledger and Blockchain
3. Technology architects wanting to expand their skills to Blockchain technology
4. Professionals curious to learn how Blockchain technology can change the way we do business
5. Entrepreneurs with technology background interested in realizing their business ideas on the Blockchain
Learn more at: https://www.simplilearn.com/
This Edureka Blockchain 101 Training will give you a complete fundamental understanding regrading Blockchain and Bitcoin. You will learn following topics:
1. What is Blockchain?
2. Blockchain concepts
3. Hyperledger
4. Blockchain Use Case
5. Blockchain in the Industry
6. Solidity programming
7. Demo: Smart Contracts
Apart from Proof of Work there are many other Consensus Mechanisms being discussed. What are they and what are their pros and cons. (Proof of Stake, Proof of Elapsed Time, Proof of Authority, Proof of Burn, Proof of Authority, Byzantine Fault Tolerance, Proof of Importance)
Ethereum is an open-source blockchain platform that offers smart contract facilities. Solidity was first introduced as a new type of programing language for the Ethereum platform. Developers use the Solidity programming language to develop smart contracts. Using Solidity, you can program the contracts to do any type of task.
Solidity is a type of object-oriented programming language. This programing language is developed specifically for smart contracts. This type of language is widely used in creating smart contracts features in blockchain platforms.
To understand Solidity better developers, need to dive into the key elements of this language, such as the compiler, pragma, reserved keywords, value types, variables, etc. There are already many use cases of using Solidity as the foundation for smart contracts. However, this language also has its fair share of issues.
Here, at 101 blockchains, we are offering courses that will help you comprehend this topic in a simple manner. Using our courses, you will understand the concepts behind Solidity and Smart contracts in no time.
Learn more about Solidity and smart contracts from here ->
Ethereum Development Fundamentals course
https://academy.101blockchains.com/courses/ethereum-development-fundamentals
The Complete Ethereum Technology Course
https://academy.101blockchains.com/courses/ethereum-technology-course
Learn more about the certification courses from here ->
Certified Enterprise Blockchain Professional (CEBP) course
https://academy.101blockchains.com/courses/blockchain-expert-certification
Certified Enterprise Blockchain Architect (CEBA) course
https://academy.101blockchains.com/courses/certified-enterprise-blockchain-architect
Certified Blockchain Security Expert (CBSE) course
https://academy.101blockchains.com/courses/certified-blockchain-security-expert
Learn more from our guide ->
https://101blockchains.com/solidity-tutorial/
https://101blockchains.com/solidity-vs-move-vs-clarity/
https://101blockchains.com/smart-contract-best-practices/
https://101blockchains.com/solidity-issues/
https://101blockchains.com/smart-contracts/
https://101blockchains.com/ethereum-smart-contracts/
https://101blockchains.com/blockchain-smart-contract-examples/
Introduction to Bitcoin's Scripting LanguageJeff Flowers
An introduction to Bitcoin's scripting language. Beginning with a historical perspective all the way to seeing an actual transaction's scripts being run in a stack environment. Further resources are provided in order to learn more about this incredible technology. http://youtu.be/4qz7XehSBCc
Ethereum is an open software platform based on blockchain technology that enables developers to
build and deploy decentralized applications.
Ethereum is a distributed public blockchain network.
While the Bitcoin blockchain is used to track ownership of digital currency (bitcoins), the Ethereum
blockchain focuses on running the programming code of any decentralized application.
Ether is a cryptocurrency whose blockchain is generated by the Ethereum platform. Ether can be
transferred between accounts and used to compensate participant mining nodes for computations
performed.
This course covers in detail the technical principles & concepts behind blockchain. In addition, it seeks to provide you with the insights and deep understanding of the various components of blockchain technology, and enables you to determine for yourself how to best leverage and exploit blockchain for your project, organisation or start-up.
Link - https://www.experfy.com/training/courses/blockchain-technology-fundamentals
An introductory presentation discussing the basics of technology behind blockchain, cryptocurrency mining, and an attempt to value a cryptocurrency. Further discussion on altcoins, and a preview on ICOs.
Ethereum Tutorial - Ethereum Explained | What is Ethereum? | Ethereum Explain...Simplilearn
This presentation on Ethereum will help you understand what is Ethereum, Ethereum features which includes cryptocurrency, smart contracts, Ethereum virtual machine, decentralized application, decentralized autonomous organization, applications of Ethereum and at the end you will see a demo on smart contract. Ethereum is a blockchain based distributed computing platform that enables developers to build and deploy their decentralized applications. Ether(ETH) is a cryptocurrency that runs on Ethereum network. It is used to pay for the computational resources and transaction fees on the Ethereum network. Ether can be utilized for building decentralized applications, smart contracts and making standard peer to peer payments. Now, lets deep dive into these slides and understand what is Ethereum and how does it work.
Below topics are explained in this Ethereum presentation:
1. What is Ethereum?
2. Ethereum features
- Cryptocurrency
- Smart contract
- Ethereum virtual machine
- Decentralized application
- Decentralized autonomous organization
3. Applications of Ethereum
4. Demo - Smart contract
Simplilearn’s Blockchain Certification Training has been designed for developers who want to decipher the global craze surrounding Blockchain, Bitcoin and cryptocurrencies. You’ll learn the core structure and technical mechanisms of Bitcoin, Ethereum, Hyperledger and Multichain Blockchain platforms, use the latest tools to build Blockchain applications, set up your own private Blockchain, deploy smart contracts on Ethereum and gain practical experience with real-world projects.
Why learn Blockchain?
Blockchain technology is the brainchild of Satoshi Nakamoto, which enables digital information to be distributed. A network of computing nodes makes up the Blockchain. Durability, robustness, success rate, transparency, incorruptibility are some of the enticing characteristics of Blockchain. By design, Blockchain is a decentralized technology which is used by a global network of the computer to manage Bitcoin transactions easily. Many new business applications will result in the usage of Blockchain such as Crowdfunding, smart contracts, supply chain auditing, Internet of Things(IoT), etc.
The Blockchain Certification Training Course is recommended for:
1. Developers
2. Technologists interested in learning Ethereum, Hyperledger and Blockchain
3. Technology architects wanting to expand their skills to Blockchain technology
4. Professionals curious to learn how Blockchain technology can change the way we do business
5. Entrepreneurs with technology background interested in realizing their business ideas on the Blockchain
Learn more at: https://www.simplilearn.com/
Blockchain Interview Questions And Answers | Blockchain Technology Interview ...Simplilearn
This presentation on "Blockchain Interview Questions And Answers" will help you prepare for Blockchain engineer interviews. This video is ideal for both beginners as well as professionals who are appearing for Blockchain interviews. Once you’ve lined up a job interview with a potential employer, you’ll have an opportunity to study that particular organization and their use of Blockchain technology. That can help you to prepare for specific Blockchain interview questions relevant to that employer. Until then, you can prepare for more general Blockchain interview questions by knowing how to demonstrate your broader knowledge of the implications and applications of Blockchain Technology. Learn what are the most important Blockchain interview questions and answers and know what will set you apart in the interview process.
Simplilearn’s Blockchain Certification Training has been designed for developers who want to decipher the global craze surrounding Blockchain, Bitcoin and cryptocurrencies. You’ll learn the core structure and technical mechanisms of Bitcoin, Ethereum, Hyperledger and Multichain Blockchain platforms, use the latest tools to build Blockchain applications, set up your own private Blockchain, deploy smart contracts on Ethereum and gain practical experience with real-world projects.
Why learn Blockchain?
Blockchain technology is the brainchild of Satoshi Nakamoto, which enables digital information to be distributed. A network of computing nodes makes up the Blockchain. Durability, robustness, success rate, transparency, incorruptibility are some of the enticing characteristics of Blockchain. By design, Blockchain is a decentralized technology which is used by a global network of the computer to manage Bitcoin transactions easily. Many new business applications will result in the usage of Blockchain such as Crowdfunding, smart contracts, supply chain auditing, etc.
This Blockchain Certification course offers a hands-on training covering relevant topics in cryptocurrency and the wider Blockchain space. From a technological standpoint, you will develop a strong grasp of core Blockchain platforms, understand what Bitcoin is and how it works, learn key vocabulary and concepts commonly used when discussing Blockchain and understand why engineers are motivated to create an app with Ethereum.
The Blockchain Certification Training Course is recommended for:
1. Developers
2. Technologists interested in learning Ethereum, Hyperledger and Blockchain
3. Technology architects wanting to expand their skills to Blockchain technology
4. Professionals curious to learn how Blockchain technology can change the way we do business
5. Entrepreneurs with technology background interested in realizing their business ideas on the Blockchain
Learn more at: https://www.simplilearn.com/
This Edureka Blockchain 101 Training will give you a complete fundamental understanding regrading Blockchain and Bitcoin. You will learn following topics:
1. What is Blockchain?
2. Blockchain concepts
3. Hyperledger
4. Blockchain Use Case
5. Blockchain in the Industry
6. Solidity programming
7. Demo: Smart Contracts
Apart from Proof of Work there are many other Consensus Mechanisms being discussed. What are they and what are their pros and cons. (Proof of Stake, Proof of Elapsed Time, Proof of Authority, Proof of Burn, Proof of Authority, Byzantine Fault Tolerance, Proof of Importance)
Ethereum is an open-source blockchain platform that offers smart contract facilities. Solidity was first introduced as a new type of programing language for the Ethereum platform. Developers use the Solidity programming language to develop smart contracts. Using Solidity, you can program the contracts to do any type of task.
Solidity is a type of object-oriented programming language. This programing language is developed specifically for smart contracts. This type of language is widely used in creating smart contracts features in blockchain platforms.
To understand Solidity better developers, need to dive into the key elements of this language, such as the compiler, pragma, reserved keywords, value types, variables, etc. There are already many use cases of using Solidity as the foundation for smart contracts. However, this language also has its fair share of issues.
Here, at 101 blockchains, we are offering courses that will help you comprehend this topic in a simple manner. Using our courses, you will understand the concepts behind Solidity and Smart contracts in no time.
Learn more about Solidity and smart contracts from here ->
Ethereum Development Fundamentals course
https://academy.101blockchains.com/courses/ethereum-development-fundamentals
The Complete Ethereum Technology Course
https://academy.101blockchains.com/courses/ethereum-technology-course
Learn more about the certification courses from here ->
Certified Enterprise Blockchain Professional (CEBP) course
https://academy.101blockchains.com/courses/blockchain-expert-certification
Certified Enterprise Blockchain Architect (CEBA) course
https://academy.101blockchains.com/courses/certified-enterprise-blockchain-architect
Certified Blockchain Security Expert (CBSE) course
https://academy.101blockchains.com/courses/certified-blockchain-security-expert
Learn more from our guide ->
https://101blockchains.com/solidity-tutorial/
https://101blockchains.com/solidity-vs-move-vs-clarity/
https://101blockchains.com/smart-contract-best-practices/
https://101blockchains.com/solidity-issues/
https://101blockchains.com/smart-contracts/
https://101blockchains.com/ethereum-smart-contracts/
https://101blockchains.com/blockchain-smart-contract-examples/
Introduction to Bitcoin's Scripting LanguageJeff Flowers
An introduction to Bitcoin's scripting language. Beginning with a historical perspective all the way to seeing an actual transaction's scripts being run in a stack environment. Further resources are provided in order to learn more about this incredible technology. http://youtu.be/4qz7XehSBCc
Ethereum is an open software platform based on blockchain technology that enables developers to
build and deploy decentralized applications.
Ethereum is a distributed public blockchain network.
While the Bitcoin blockchain is used to track ownership of digital currency (bitcoins), the Ethereum
blockchain focuses on running the programming code of any decentralized application.
Ether is a cryptocurrency whose blockchain is generated by the Ethereum platform. Ether can be
transferred between accounts and used to compensate participant mining nodes for computations
performed.
This course covers in detail the technical principles & concepts behind blockchain. In addition, it seeks to provide you with the insights and deep understanding of the various components of blockchain technology, and enables you to determine for yourself how to best leverage and exploit blockchain for your project, organisation or start-up.
Link - https://www.experfy.com/training/courses/blockchain-technology-fundamentals
An introductory presentation discussing the basics of technology behind blockchain, cryptocurrency mining, and an attempt to value a cryptocurrency. Further discussion on altcoins, and a preview on ICOs.
Ethereum Tutorial - Ethereum Explained | What is Ethereum? | Ethereum Explain...Simplilearn
This presentation on Ethereum will help you understand what is Ethereum, Ethereum features which includes cryptocurrency, smart contracts, Ethereum virtual machine, decentralized application, decentralized autonomous organization, applications of Ethereum and at the end you will see a demo on smart contract. Ethereum is a blockchain based distributed computing platform that enables developers to build and deploy their decentralized applications. Ether(ETH) is a cryptocurrency that runs on Ethereum network. It is used to pay for the computational resources and transaction fees on the Ethereum network. Ether can be utilized for building decentralized applications, smart contracts and making standard peer to peer payments. Now, lets deep dive into these slides and understand what is Ethereum and how does it work.
Below topics are explained in this Ethereum presentation:
1. What is Ethereum?
2. Ethereum features
- Cryptocurrency
- Smart contract
- Ethereum virtual machine
- Decentralized application
- Decentralized autonomous organization
3. Applications of Ethereum
4. Demo - Smart contract
Simplilearn’s Blockchain Certification Training has been designed for developers who want to decipher the global craze surrounding Blockchain, Bitcoin and cryptocurrencies. You’ll learn the core structure and technical mechanisms of Bitcoin, Ethereum, Hyperledger and Multichain Blockchain platforms, use the latest tools to build Blockchain applications, set up your own private Blockchain, deploy smart contracts on Ethereum and gain practical experience with real-world projects.
Why learn Blockchain?
Blockchain technology is the brainchild of Satoshi Nakamoto, which enables digital information to be distributed. A network of computing nodes makes up the Blockchain. Durability, robustness, success rate, transparency, incorruptibility are some of the enticing characteristics of Blockchain. By design, Blockchain is a decentralized technology which is used by a global network of the computer to manage Bitcoin transactions easily. Many new business applications will result in the usage of Blockchain such as Crowdfunding, smart contracts, supply chain auditing, Internet of Things(IoT), etc.
The Blockchain Certification Training Course is recommended for:
1. Developers
2. Technologists interested in learning Ethereum, Hyperledger and Blockchain
3. Technology architects wanting to expand their skills to Blockchain technology
4. Professionals curious to learn how Blockchain technology can change the way we do business
5. Entrepreneurs with technology background interested in realizing their business ideas on the Blockchain
Learn more at: https://www.simplilearn.com/
An introduction to the basic working mechanism of bitcoin and blockchain: how bitcoin works, bitcoin network, nodes, miners, hashing, difficulty and nonce, etc, why bitcoin mining consumes so much energy. Variations of blockchain, MDL.
Talk slide at Blockchain&DAPPs technologies meetup held on 11th April 2018 @ Microsoft - Singapore.
The slides cover the basic concept of bitcoin wallet functionalities.
Prof Willy Susilo presented a seminar titled "Blockchain and its Applications" as part of the SMART Seminar Series on 20th September 2018.
More information: https://news.eis.uow.edu.au/event/blockchain-and-its-applications/
Keep updated with future events: http://www.uoweis.co/events/category/smart-infrastructure-facility/
Crypto Wallets: A Technical Perspective (Nakov at OpenFest 2018)Svetlin Nakov
Crypto-Wallets: A Technical Perspective
Svetlin Nakov @ OpenFest 2018 - https://www.openfest.org/2018/en/
Sofia, 4 November 2018
In this talk the speaker explains the concepts of crypto-wallets used by the blockchain developers to securely keep the private keys controlling the blockchain addresses and crypto-assets. The different wallet types (brain, paper, desktop, mobile, online, hardware) will be introduced and how to build and interact with wallets, sign and send blockchain transactions are demonstrated. The speaker explains the basic concepts and will give examples how to use and interact with keystores (holding a single ECC-based private key) and hierarchical deterministic wallets (HD wallets), which use mnemonic phrases with key-derivation based on the BIP39 and the BIP44 standards to keep multiple private keys.
All attendees are invited to create their own crypto-wallet and to get some testing crypto-coins (Ethereum Ropsten Testnet ethers – ETHt) and to send a few payment transactions on the Testnet.
All concepts are demonstrated with live examples in JavaScript: creating a simple wallet, encrypting and saving it; creating a new random HD wallet and creating an HD wallet from mnemonic phrase, along with deriving private keys.
Learn more at: http://www.nakov.com/blog/2018/11/04/crypto-wallets-a-technical-perspective-nakov-at-openfest-2018/
Deploy a blockchain web-app with Hyperledger Fabric 1.4 - Concepts & CodeHorea Porutiu
This video will talk through the concepts needed to understand a Hyperledger Fabric solution - it will talk about smart contracts, the client application, the connection profile, the hyperledger fabric SDK, and how to use a UI to update the ledger.
A Quick Start To Blockchain by Seval CaprazSeval Çapraz
Blockchain is one of the most innovative discoveries of the past century.
The first cryptocurrency, Bitcoin, was proposed in 2008 by Satoshi Nakamoto with a white paper.
A introduction to core concepts and ideas behind blockchain helping everyone understanding what it is, how to use it and how it can deliver benefits in a range of use cases.
https://www.arcblock.io
Learn how to use Forge Framework to easily deploy your own blockchains in the real world. This introduction includes instructions on how to build a deployment script, reference architecture and looks at some of the most common issues app developers run into when building apps.
https://www.arcblock.io
Part 4 of ArcBlock's Designing DApps learning series focuses on the concept of Programmable Tokens and looks at why tokens are required to have a successful DApp.
https://www.arcblock.io/en/learning
Build a Decentralized, public verifiable Database with ex_abci and TendermintArcBlock
ArcBlock's VP of Engineering, Tyr Chen, led a session at CodeBEAM SF and presented a talk called Build Decentralized, Pubically Verifiable DB with ex_abci and Tendermint. The session included an in-depth look at why decentralization and having services that are publically verifiable matter. Tyr Chen also looked at different use cases that ArcBlock is exploring including ownership of digital assets and how those can be verified publicly.
https://www.arcblock.io
The talk also gave developers a preview of ArcBlock's Forge Framework. A new chain building service that includes everything needed to create, build and deploy a user created blockchain.
https://www.arcblock.io/en/forge-framework
ArcBlock Presents 5 Winning Factors to Building a Successful DAppArcBlock
ArcBlock's Technical Learning Series presents part 2 of our Designing DApps series. This session is focused on the 5 winning factors for designing, building and launching a successful DApp.
https://www.arcblock.io
QRCodes are Fun, Easy, and Useful for Links, Payments and Identity VerificationArcBlock
ArcBlock Technical Learning Series Presents an introduction to QRCodes.
We scan QRCode for payment, links and basically everything. How do QRcodes work? Are QRcodes secure? Why can I put a logo in the middle of QRCode and it still works? In this talk, we will show you how the QRCode is being drawn. Also, we will talk about Reed-Solomon error correction inside QRCode that makes it fault tolerant.
二维码源于日本,如今世界各国都在使用。一张简单的二维码蕴藏了不简单的信息。二维码究竟是如何画出来的?二维码安全吗?为何在二维码中加个图标还能被扫出来?卫星通讯中用到的Reed-Solomon纠错码如何被用在了二维码中?本次讲座为您揭晓二维码的生成原理,听完保证可以get手绘二维码技能。
https://www.arcblock.io
ArcBlock Technical Learning Series presents Designing Decentralized Applications (DApps) Part 1. This is the first of a 5-part series to help developers, Venture Capitalists, Fund Analysts and product managers prepare, plan and design real-world decentralized applications.
https://www.arcblock.io
The goal of this series is to create a new product mindset focused on decentralization. This includes examining the role of decentralization in the past, problems related to the centralized internet including user account and data controlled by a few companies, security and privacy and more.
We will also look at some of the first decentralized applications like Napster, Popcorn Time, Mastadon, ZeroNet, and OpenBazaar.
Next, we will review the role of identity and how today's companies are pushing people back towards decentralized applications to get control of their own identities. This includes new digital wallets and self-sovereign identity and how future applications will leverage these new decentralized identity models.
https://hack.arcblock.io/learning
ArcBlock's Technical Learning Series presents: Cryptography for everyone.
Cryptography is a foundational piece in BlockChain technology. The reason BlockChain is secured is based on the promise of the underlying cryptographic primitives. In this talk, we will give an introduction to cryptography, from symmetric encryption to public key encryption. We will see how it makes blockchain technology possible. Also, we will talk about the crypto primitives behind cryptocurrency wallet. So you will know how important is your private key.
区块链是集多种高大上技术为大成的应用,密码学占其中最重要的一环。事实上,平日我们在互联网上做的任何事情都有密码学的身影在里面。区块链所用到的的sha256, secp256k1, ed25519都是些什么鬼?本次讲座将从一个最简单的问题开始——如何隐藏不能说的秘密——一直讲到现代密码学在区块链以及钱包中的应用,为您揭开密码学娇羞的面纱。 听完您会明白,为什么我不该在云上备份钱包里的私钥。
https://www.arcblock.io
ArcBlock's Technical Learning Series Presents: Intro to HTTP/2.
You may not know that your browser supports HTTP/2 long times ago. What exactly is HTTP/2? What's the difference between HTTP/2 and HTTP? Why do we even need HTTP2/? What can we do with HTTP/2's new feature? This talk is all about HTTP/2, also we will demonstrate how to write a simple HTTP/2 client in 33 lines of code.
HTTP/2早在2015年就被互联网工程任务小组制定为标准,我们用的浏览器其实早就悄悄支持HTTP/2了。HTTP/2到底比HTTP/1.1好在哪里?关于HTTP/2我需要知道什么?听说HTTP/3快要出了现在才讲HTTP/2是不是有点晚?这篇讲座将解答您的这些问题。另外我们也会现场演示如何用33行代码写一个最简单的HTTP/2客户端。"
ArcBlock Technical Learning Series Presents IPFS.
If there's a missing piece in current blockchain stack, that'll be a decentralized, public verifiable file system. Ideally before decentralizing computing, we shall decentralize the data. IPFS filled in this area, and it has a great potential to push web to the true web3 - decentralized web. This talk will talk about what problem IPFS is trying to solve, how it solves the problem, and how to use IPFS in our applications.
https://www.arcblock.io
https://hack.arcblock.io/learning
Ethereum virtual machine for Developers Part 1ArcBlock
Learn all about Ethereum Virtual Machines and how they work including basic concepts, smart contracts, best practices for developers and next steps to support various uses cases.
https://www.arcblock.io
ArcBlock presents Elixir ExUnit. Learn how to write a unit test for Elixir code? This talk will give an introduction to ExUnit in Elixir, what components are included in it and how to use them.
ArcBlock's Technical Learning Series presents Tendermint: Consensus made easy.
Tendermint is an opensource software aimed to securely and consistently replicating an application on many machines. It acts as a consensus engine and provides a generic application interface called ABCI which makes it pretty easy to integrate itself into other blockchain technology, like Ethereum.
This talk will give a high-level introduction to Tendermint, its architecture, how consensus works and how application data are replicated. We will also give some scenario about how Tendermint could be used to solve various problems.
https://www.arcblock.io
This session of ArcBlock's Technical Learning Series will introduce CQRS and commanded.
CQRS stands for Command Query Responsibility Segregation. At its heart is the notion that you can use a different model to update information than the model you use to read information.
We will have a look into what CQRS and commanded (a framework for elixir) are and how they fit together, followed by a introduction on how to implement an application using CQRS concepts with commanded in our service. "
Decipher Multi-Factor Authentication - A Developers IntroductionArcBlock
ArcBlock's Technical Learning Series presents Deciphering MFA.
Multi-Factor Authentication or MFA is used widely for enhanced account security. This talks will describe and outline the underlying technology used for MFA. For example, TOTP - Time-Based One-Time Password. This is an IETF standard - RFC 6238.
Learn how to develop and build MFA into your DApp, application or platform.
https://www.arcblock.io
https://hack.arcblock.io/learning
Introduction to aws data pipeline servicesArcBlock
This session of the ArcBlock Learning Series will teach you how to access, transform, and process stored data at scale with AWS's Data Pipeline Service. ArcBlock will also demonstrate several use case examples by looking at how ArcBlock is using AWS Data Pipeline today.
AWS Pipeline Service is a web service that helps users reliable process and moves data between different compute and storage services. It is a powerful tool that allows users to easily create complex data processing workloads without being an expert in fault tolerance, resource availability or being worried about retrying transient failures or timeouts for your individual tasks.
ArcBlock Technical Learning Series introduces Smart Contracts.
During this technical learning session, ArcBlock Engineers take a deep drive into Smart Contracts and introduce critical concepts and functionality to make smart contracts work.
https://www.arcblock.io
During this training, ArcBlock also looks key processes and best practices for developers on how to create, maintain and work with Smart Contracts. Finally, ArcBlock looks at its own use cases and provides several examples demonstrating the concepts and features shown during the training
ArcBlock Presents An Introduction to BlockchainArcBlock
A walk through on the history of blockchain including the history and transition between blockchain 1.0, blockchain 2.0 and today's latest iteration Blockchain 3.0. The presentation looks at how blockchain got started with Bitcoin and evolved with Ethereum and the smart based contract. It also looks at how today, decentralized applications and platforms are driving change in the blockchain industry by making blockchain more available to end-users and companies.
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
Check out the webinar slides to learn more about how XfilesPro transforms Salesforce document management by leveraging its world-class applications. For more details, please connect with sales@xfilespro.com
If you want to watch the on-demand webinar, please click here: https://www.xfilespro.com/webinars/salesforce-document-management-2-0-smarter-faster-better/
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4. What is Wallet?
• Wallets contain keys, not coins, each user has a wallet containing keys
• Users sign transactions with the keys, all transactions stored on blockchain
4
7. What is Non-Deterministic Wallet?
Random Wallet
• Private/public key pairs are generated randomly, not related to each other
• Backup/restore/migration must be done with each key pair
• Satoshi Client : JBOK (just a bunch of keys)
7
9. What is Deterministic Wallet?
Seeded Wallet
• Derive large amounts of private/public key pairs from same single seed phrase
• Backup/restore/migration can be done with the seed phrase at creation time
• Derive algorithm = one way hash function
• Deterministic wallets can be sequential or hierarchical
9
13. What is Hierarchical Deterministic Wallet? (ctnd.)
• Generated private/public key pairs are organized into a tree, derived using a path
• Tree structure can be used to express additional organizational meaning
• Each node has private and public key, any node can derive any number of children
• Can be shared partially or entirely with different systems, each with or without the ability to
spend coins
• Industry standard for generating multiple network wallets with same seed phrase,
supported by most wallet apps
13
15. What is BIP then?
BIP = Bitcoin Improvement Proposal
Design document providing information to the Bitcoin community, or describing a new
feature for Bitcoin or its processes or environment. Each BIP is assigned a number.
• Meta BIP
• BIP Workflow
• Complete BIP list
15
16. HD Wallet related BIPs
• BIP32: Hierarchical Deterministic Wallets
• BIP43: Purpose Field for Deterministic Wallets
• BIP44: Multi-Account Hierarchy for Deterministic Wallets
16
17. What is BIP32?
Core BIP related to HD Wallet
• Spec for key pair derivation from a master seed
• Spec for wallet construction on top of such key pair tree
17
18. BIP32: Child Key Derivation Algorithm?
Child Key Derivation function
• CKD is one-way hash function that make uses of following 3 inputs
• A parent private or public key
• A seed called a chain code
• An index number (32 bits means 2^32 child)
• Important property of derived keys
• Child private keys are indistinguishable from non-deterministic (random) keys
• Can be used to make a public key and a address
• Can be used to sign transactions to spend anything paid to that address
• The fact that they are part of a sequence is not visible outside of the HD wallet
18
21. BIP32: How to Derive Child Key: Javascript
HDKey.prototype.deriveChild = function(index) {
var indexBuffer = Buffer.allocUnsafe(4);
indexBuffer.writeUInt32BE(index, 0);
var data = Buffer.concat([this.publicKey, indexBuffer]);
var I = crypto.createHmac('sha512', this.chainCode).update(data).digest();
var IL = I.slice(0, 32);
var IR = I.slice(32);
var child = new HDKey();
if (this.privateKey) {
child.privateKey = secp256k1.privateKeyTweakAdd(this.privateKey, IL);
} else {
child.publicKey = secp256k1.publicKeyTweakAdd(this.publicKey, IL, true);
}
child.chainCode = IR;
child.depth = this.depth + 1;
child.index = index;
return child;
};
21
22. BIP32: Child Key Derive Function Notation
• Child private key derivation:
• Child public key derivation:
22
23. BIP32: Why Chain Code in CKD?
• Introduce deterministic random data to the process
• Initial chain code seed (at the root of the tree) is generated from the seed
• Subsequent child chain codes are derived from each parent chain code
• Add another layer to HD wallet privacy
• Public key can be easily found, if chain code not present, all child keys are revealed
23
24. BIP32: What is Extended Key?
Child key derivation requires both parent key and parent chain code.
• Extensible keys, keys that can derive children
• Extended Private Key = Private Key + Chain Code , xpriv
• Extended Public Key = Public Key + Chain Code , xpub
• Can be root of a branch in the tree structure of the HD wallet
• Knowing xpriv allows reconstruction of all descendant private keys and public keys
• Knowing xpub allows reconstruction of all descendant public keys
• Should be treated with more care than random generated public key
24
25. BIP32: Where Should We Start? Master Key!
Now we have CKD functions, where should we start to generate a tree?
• Generate random extended keys directly?
• We have a total of 2^512 extended keys, because it’s 512 bits long
• But can only produced 2^256 possible public/private keys, because they are 256 bits long
• Generate master key from potential random value ( better )
• Generate seed of a chosen length from RNG
• Calculate HMAC-SHA512 hash from the seed
• Split hash into 2 256-bits sequences
• Left as master secret key, right as master chain code
25
32. Why BIP44?
• BIP32 specification offers implementors too many degrees of freedom, infinite depth
• BIP32 compatible wallets can produce wallets with different logical structures
32
33. What is BIP44?
• BIP43: Purpose Field for Deterministic Wallets
• BIP44: Multi-Account Hierarchy for Deterministic Wallets
• Defined a specific logical hierarchy for deterministic wallets based on the
algorithm described in BIP-32
• Provided a network agnostic method of generating secure keys in an incredibly
flexible manner
33
34. BIP44: Derive Path Notation
Notation
Example
• CKD: m : CKDpriv is used, M for CKDPub
• Purpose: 44' , hardened , which spec is used, 44 means BIP44
• Coin: 60' , hardened , 60 means Ethereum, coin types
• Account: 0' , hardened , enable multiple accounts under single network
• Change: 0 , 0 means external in Bitcoin, always 0 in Ethereum
• Index: 0 , the first public/private key pair leaf node
m / purpose' / coin_type' / account' / chain / address_index
m/44'/60'/0'/0/0
34
37. What is Mnemonic Code?
Mnemonic Code = Word sequences that represent a random number
used as a seed to derive HD wallets
• Easy to transcribe, record on paper
• Easy to export and import into another wallet
• More secure than brain wallet ,
37
38. What is BIP39?
Mnemonic code for generating deterministic keys
• Describes how to generate mnemonic code from random number
• Describes how to convert mnemonic code to master seed
38
40. BIP39: Entropy and Mnemonic code
Different length of random number( entropy ) leads to different Mnemonic length
Entropy Checksum Entropy + Checksum Mnemonic Length
128 4 132 12
160 5 165 15
192 6 198 18
224 7 231 21
256 8 264 24
Mnemonic word duplicate is possible
40
41. BIP39: Mnemonic Code Wordlist
Multilingual support (2048 words in each language):
• English
• Japanese
• Korean
• Spanish
• Chinese (Simplified)
• Chinese (Traditional)
• French
• Italian
41
42. BIP39: Mnemonic Generating Code: Javascript
function generateMnemonic(strength, rng, wordlist) {
strength = strength || 128;
if (strength % 32 !== 0) throw new TypeError(INVALID_ENTROPY);
rng = rng || randomBytes;
return entropyToMnemonic(rng(strength / 8), wordlist);
}
function entropyToMnemonic(entropy, wordlist) {
if (!Buffer.isBuffer(entropy)) entropy = Buffer.from(entropy, 'hex');
wordlist = wordlist || DEFAULT_WORDLIST;
var entropyBits = bytesToBinary([].slice.call(entropy));
var checksumBits = deriveChecksumBits(entropy);
var bits = entropyBits + checksumBits;
var chunks = bits.match(/(.{1,11})/g);
var words = chunks.map(function(binary) {
var index = binaryToByte(binary);
return wordlist[index];
});
return wordlist === JAPANESE_WORDLIST ? words.join('u3000') : words.join(' ');
}
42
43. BIP39: Possible to Brute Force Attack Mnemonic?
Take 12 words mnemonic, 2048 word list as example:
• Possible permutation = 2048!/(2048 - 12)! = 5.27e+39
• 10000 guess/second = 10000 * 60 * 60 * 24 * 364 = 3.15*e+11 guess/year
• Years take to check all = 1.67e+28 year
Longer Mnemonic = Better Randomness = Better Security
43
45. BIP39: From Mnemonic to Master Seed (code)
function mnemonicToSeed(mnemonic, password) {
var mnemonicBuffer = Buffer.from(unorm.nfkd(mnemonic), 'utf8');
var saltBuffer = Buffer.from(salt(unorm.nfkd(password)), 'utf8');
return pbkdf2(mnemonicBuffer, saltBuffer, 2048, 64, 'sha512');
}
45
46. BIP39: Mnemonic + Passphrase = Better Security
• Mnemonic
• Checksum makes randomly generated word sequences invalid mnemonic
• Possible set of 2^512 wallets, no practical possibility of brute-forcing or accidentally guessing
one that is in use
• Passphrase
• Given a single mnemonic, every possible passphrase leads to a different seed
• Passphrase as second factor, makes it hard to compromise the wallet when mnemonic leaked
46
51. Where to Learn More?
• BIP32: Hierarchical Deterministic Wallets
• BIP39: Mnemonic code for generating deterministic keys
• BIP43: Purpose Field for Deterministic Wallets
• BIP44: Multi-Account Hierarchy for Deterministic Wallets
• Master Bitcoin 2nd Edition: Wallets and Address
• Bitcoin Developer Guide
• HD Wallet Playground: Support Many Chains
• HD Wallet Playground: Only Ethereum Support
51