CBDH subjects - BTA Certified Blockchain Developer Hyperledger Updated: 2023
CBDH BTA Certified Blockchain Developer Hyperledger
This test is a 70 question multiple-choice test that lasts 1.5 hours and is a performance-based evaluation of Hyperledger development skills and knowledge. Internet access is not provided during the exam, nor is any course material or study guides.
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Official scores for exams come immediately following the test from Pearson VUE. A passing score is 70%. test results are reported PASS/FAIL and you will be provided your percentage. Blockchain Training Alliance does not report scores on individual items, nor will it provide additional information upon request.
The BTA Certified Blockchain Developer Hyperledger Fabric (CBDH) test is an elite way to demonstrate your knowledge and skills in this emerging space. Additionally, you will become a member of a community of Blockchain leaders. With certification comes monthly industry updates via email and video.
The CBDH test is a 70 question multiple-choice test that lasts 1.5 hours and is a performance-based evaluation of Hyperledger Fabric development skills and knowledge. Internet access is not provided during the exam, nor is any course material or study guides.
A person who holds this certification demonstrates their ability to:
Plan and prepare production-ready applications for the Hyperledger blockchain
Write, test, and deploy secure chain code
Understand how to use Hyperledger Composer to rapidly build Hyperledger applications
Write chain code using either Go or NodeJS
This test will prove that a student completely understands how to:
Create a Hyperledger model
Build proper access controls for blockchain assets via .acl
Implement a Hyperledger ".bna" banana
Write and compile smart contracts as chain code
Deploy smart contracts on channels in the private network
BlockChain Hyperledger Topics
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BTA Certified Blockchain Developer Hyperledger
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Question: 119
What Hyperledger sponsored tool is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain
applications, thus reducing the time and complexity of development.
The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming)
details involved in blockchain networks?
A. Hyperledger Quilt
B. Hyperledger Composer
C. Hyperledger Explorer
D. Hyperledger Cello
Answer: B
Explanation:
There is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing
the time and complexity of development. The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to
know the low-level (Go Programming) details involved in blockchain networks.
Question: 119
What Hyperledger sponsored tool is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain
applications, thus reducing the time and complexity of development.
The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to know the low-level (Go Programming)
details involved in blockchain networks?
A. Hyperledger Quilt
B. Hyperledger Composer
C. Hyperledger Explorer
D. Hyperledger Cello
Answer: B
Explanation:
There is a new open-source application development framework, which simplifies the creation of Hyperledger Fabric blockchain applications, thus reducing
the time and complexity of development. The tool aims at helping users to create blockchain applications based on Hyperledger Fabric without needing to
know the low-level (Go Programming) details involved in blockchain networks.
Question: 120
The CA (Certificate Authority) in Hyperledger Fabric issues the certificates. These certificates are used for identity validation and for transmission of
encrypted data that only the owner (person, organization or software) of a specific certificate is able to decrypt and read.
What types of certificates are issued by the CA?
A. tcert
B. ecert
C. rootcert
Answer: ABC
Explanation:
Rootcert, tcert and ecert. As The CA (Fabric CA by default) issues a root certificate (rootCert) to each member (organization or individual) that is authorized
to join the network. The CA also issues an enrollment certificate (eCert) to each member component, server-side applications and occasionally end users.
Each enrolled user is granted an allocation of transaction certificates (tCerts). Each tCert authorizes one network transaction.
Question: 120
The CA (Certificate Authority) in Hyperledger Fabric issues the certificates. These certificates are used for identity validation and for transmission of
encrypted data that only the owner (person, organization or software) of a specific certificate is able to decrypt and read.
What types of certificates are issued by the CA?
A. tcert
B. ecert
C. rootcert
Answer: ABC
Explanation:
Rootcert, tcert and ecert. As The CA (Fabric CA by default) issues a root certificate (rootCert) to each member (organization or individual) that is authorized
to join the network. The CA also issues an enrollment certificate (eCert) to each member component, server-side applications and occasionally end users.
Each enrolled user is granted an allocation of transaction certificates (tCerts). Each tCert authorizes one network transaction.
Question: 121
The gossip data dissemination protocol performs which three functions? (Choose three.)
A. Manages peer discovery and channel membership
B. Disseminates ledger data across all peers on the channel
C. Manages channel membership only
D. Sync ledger state across all peers on any channel
E. Sync ledger state across all peers on the channel
F. Manages peer discovery only
Answer: ABE
Explanation:
Gossip Protocol The gossip data dissemination protocol performs three functions Manages peer discovery and channel membership Disseminates ledger data
across all peers on the channel Syncs ledger state across all peers on the channel.
Reference: https://hyperledger-fabric.readthedocs.io/en/v1.1.0-alpha/gossip.html
Question: 121
The gossip data dissemination protocol performs which three functions? (Choose three.)
A. Manages peer discovery and channel membership
B. Disseminates ledger data across all peers on the channel
C. Manages channel membership only
D. Sync ledger state across all peers on any channel
E. Sync ledger state across all peers on the channel
F. Manages peer discovery only
Answer: ABE
Explanation:
Gossip Protocol The gossip data dissemination protocol performs three functions Manages peer discovery and channel membership Disseminates ledger data
across all peers on the channel Syncs ledger state across all peers on the channel.
Reference: https://hyperledger-fabric.readthedocs.io/en/v1.1.0-alpha/gossip.html
Question: 122
The Hyperledger Fabric framework is implemented on what programming environment?
A. C++
B. Node.js
C. Go
D. PHP
E. Javascript
F. Python
Answer: C
Reference: https://hyperledger-fabric.readthedocs.io/en/release-1.3/prereqs.html
Question: 122
The Hyperledger Fabric framework is implemented on what programming environment?
A. C++
B. Node.js
C. Go
D. PHP
E. Javascript
F. Python
Answer: C
Reference: https://hyperledger-fabric.readthedocs.io/en/release-1.3/prereqs.html
Question: 123
When creating a network according to an organizations structure and also bootstrap a channel what are the following artifacts we would need to generate?
A. Genesis Block, License File and Anchor Peer Configs for each organization.
B. Genesis Block, ledger Configuration and Anchor Peer Configs for each organization.
C. Genesis Block, Channel Configuration and Anchor Peer Configs for each organization.
D. Genesis Block, Channel Configuration and Anchor MSP Configs for each organization.
Answer: C
Explanation:
To create a network according to an organizations structure, and to bootstrap a channel, we will need to generate the following artifacts: A genesis block,
containing organization-specific certificates that serve to initialize the Fabric blockchain. Channel configuration information. Anchor peer configurations for
each organization. An anchor peer serves as a fulcrum within an organization, for cross-organization ledger syncing using the Fabric gossip protocol.
Question: 123
When creating a network according to an organizations structure and also bootstrap a channel what are the following artifacts we would need to generate?
A. Genesis Block, License File and Anchor Peer Configs for each organization.
B. Genesis Block, ledger Configuration and Anchor Peer Configs for each organization.
C. Genesis Block, Channel Configuration and Anchor Peer Configs for each organization.
D. Genesis Block, Channel Configuration and Anchor MSP Configs for each organization.
Answer: C
Explanation:
To create a network according to an organizations structure, and to bootstrap a channel, we will need to generate the following artifacts: A genesis block,
containing organization-specific certificates that serve to initialize the Fabric blockchain. Channel configuration information. Anchor peer configurations for
each organization. An anchor peer serves as a fulcrum within an organization, for cross-organization ledger syncing using the Fabric gossip protocol.
Question: 124
Which Hyperledger tool would you select to invoke, deploy or query blocks, transactions and associated data, network information (name, status, list of
nodes), chain codes and transaction families, as well as other relevant information stored in the ledger?
A. Hyperledger Quilt
B. Hyperledger Cello
C. Hyperledger Caliper
D. Hyperledger Explorer
Answer: D
Explanation:
Hyperledger explorer: Hyperledger explorer, which was originally contributed by IBM, Intel, and DTCC, can view, invoke, deploy or query blocks,
transactions and associated data, network information (name, status, list of nodes), chain codes and transaction families, as well as other relevant information
stored in the ledger.
Question: 124
Which Hyperledger tool would you select to invoke, deploy or query blocks, transactions and associated data, network information (name, status, list of
nodes), chain codes and transaction families, as well as other relevant information stored in the ledger?
A. Hyperledger Quilt
B. Hyperledger Cello
C. Hyperledger Caliper
D. Hyperledger Explorer
Answer: D
Explanation:
Hyperledger explorer: Hyperledger explorer, which was originally contributed by IBM, Intel, and DTCC, can view, invoke, deploy or query blocks,
transactions and associated data, network information (name, status, list of nodes), chain codes and transaction families, as well as other relevant information
stored in the ledger.
Question: 125
Blockchain services consists of three major components.
What are they? (Select three.)
A. Consensus Manager
B. Distributed Ledger
C. Peer to Peer Protocol
D. Reputation Manager
E. Membership Services
Answer: ABC
Explanation:
1. P2P Protocol is implemented over HTTP/2 standards and uses Google RPC.. P2P components define messages used by peer nodes, from point to point to
multicast. 2. Distributed Ledger manages the world state and the transaction log in the blockchain. 3. Consensus Manager defines the interface between the
consensus algorithm and the other Hyperledger components.
Question: 125
Blockchain services consists of three major components.
What are they? (Select three.)
A. Consensus Manager
B. Distributed Ledger
C. Peer to Peer Protocol
D. Reputation Manager
E. Membership Services
Answer: ABC
Explanation:
1. P2P Protocol is implemented over HTTP/2 standards and uses Google RPC.. P2P components define messages used by peer nodes, from point to point to
multicast. 2. Distributed Ledger manages the world state and the transaction log in the blockchain. 3. Consensus Manager defines the interface between the
consensus algorithm and the other Hyperledger components.
Question: 126
Level DB is the default database for Hyperledger Fabric and is particularly appropriate when ledger states comprise what type of data?
A. Complex key-value pairs
B. Rich Queries
C. JSON data pairs
D. Simple key-value pairs
Answer: D
Explanation:
Simple key-value pairs LevelDB is the default and is particularly appropriate when ledger states are simple key-value pairs. A LevelDB database is closely
co-located with a network node it is embedded within the same operating system process. CouchDB is a particularly appropriate choice when ledger states
are structured as JSON documents because CouchDB supports the rich queries and update of richer data types often found in business transactions.
Implementationwise, CouchDB runs in a separate operating system process, but there is still a 1:1 relation between a network node and a CouchDB instance.
All of this is invisible to chaincode.
Reference: https://hyperledger-fabric.readthedocs.io/en/release-1.3/ledger/ledger.html
Question: 126
Level DB is the default database for Hyperledger Fabric and is particularly appropriate when ledger states comprise what type of data?
A. Complex key-value pairs
B. Rich Queries
C. JSON data pairs
D. Simple key-value pairs
Answer: D
Explanation:
Simple key-value pairs LevelDB is the default and is particularly appropriate when ledger states are simple key-value pairs. A LevelDB database is closely
co-located with a network node it is embedded within the same operating system process. CouchDB is a particularly appropriate choice when ledger states
are structured as JSON documents because CouchDB supports the rich queries and update of richer data types often found in business transactions.
Implementationwise, CouchDB runs in a separate operating system process, but there is still a 1:1 relation between a network node and a CouchDB instance.
All of this is invisible to chaincode.
Reference: https://hyperledger-fabric.readthedocs.io/en/release-1.3/ledger/ledger.html
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What Is Hyperledger?
Hyperledger is a global enterprise blockchain project that offers the necessary framework, standards, guidelines, and tools to build open-source blockchains and related applications for use across various industries. Hyperledger's projects include a variety of enterprise-ready permissioned blockchain platforms, where network participants are known to one another and therefore have an intrinsic interest in participating in the consensus-making process.
Using the available components under the Hyperledger umbrella, a business can apply various modular blockchain solutions and services to significantly Strengthen the performance of their operations and the efficiency of their business processes.
Key Takeaways
- Hyperledger is an open-source community focused on developing a suite of stable frameworks, tools, and libraries for permissioned, enterprise-grade blockchain deployments.
- It is a global collaboration, hosted by The Linux Foundation, and includes member organizations that are leaders in finance, banking, Internet of Things, supply chains, manufacturing, and technology.
- Several sub-projects exist, including Hyperledger Fabric, Sawtooth, Composer, and Cello.
- Hyperledger varies from Bitcoin as it is not a cryptocurrency but instead used to develop frameworks and tools.
- Hyperledger uses a consensus layer, smart contract layer, communication layer, and API.
Understanding Hyperledger
The Hyperledger project was created in December 2015 by the San Francisco, Californiaâbased Linux Foundation. It started with 30 member firms and has grown to about 140 member companies today.
Hyperledger was set up with the aim of accelerating industry-wide collaboration for developing high-performance and reliable blockchain and distributed ledger-based technology framework that could be used across the various industry sectors to enhance the efficiency, performance, and transactions of the various business processes.
Hyperledger is a global collaboration that includes leading businesses from the fields of finance, banking, Internet of Things (IoT), supply chain management, manufacturing and production, and technology. They include big names like Bosch, IBM, Microsoft, Oracle, Deloitte, Hitachi, American Express, JP Morgan, and Visa, in addition to a host of blockchain-based startups like ConsenSys.
The Linux Foundation has launched over 70 open sourced organizations with Hyperledger being among the fastest growing.
Hyperledger's Organizational Structure
Essentially, Hyperledger is not an organization, a cryptocurrency network, or a blockchain system. It does not support a cryptocurrency like bitcoin, but it works by providing the necessary infrastructure and standards for developing various blockchain-based systems and applications for industrial use. Think of Hyperledger as a hub, where various individual blockchain-based projects and tools that adhere to its defined design philosophy operate under its umbrella.
The various projects include the following:
- Hyperledger Fabric is a platform for building various blockchain-based products, solutions, and applications for business use. A now-defunct layer called Hyperledger Composer has since been replaced with Fabric as well.
- Hyperledger Cello allows blockchain to be used through an on-demand âas-a-serviceâ deployment model (Blockchain-as-a-Service).
- Hyperledger Explorer is a dashboard utility that allows for the monitoring, searching, and maintenance of blockchain developments and related data.
- Hyperledger Burrow is a permissioned Ethereum smart-contract blockchain node that handles transactions and executes smart contract code on the Ethereum Virtual Machine (EVM). It was discontinued in 2022.
- Hyperledger Sawtooth is an enterprise-level, permissioned, modular blockchain platform that uses an innovative Proof of Elapsed Time consensus algorithm.
- Hyperledger Caliper is a blockchain benchmark tool that is used to evaluate the performance of a specific blockchain implementation.
All such projects under the Hyperledger umbrella follow the design methodology that supports a modular and extensible approach, interoperability, and security features. The projects remain agnostic to a particular token or cryptocurrency, though a user can create one as required.
Hyperledger was founded in 2016 with 30 founding corporate members.
Hyperledger Technology Layers
In terms of the architecture, Hyperledger uses the following key business components:
- The consensus layer takes care of creating an agreement on the order and confirming the correctness of the set of transactions that constitute a block.
- The smart contract layer is responsible for processing transaction requests and authorizing only valid transactions.
- The communication layer takes care of peer-to-peer message transport.
- The identity management services are the necessary function for maintaining and validating the identities of users and systems and establishing trust on the blockchain.
- The API, or application programming interface, enables external applications and clients to interface with the blockchain.
Hyperledger vs. Bitcoin
As mentioned earlier, Hyperledger is vastly different from Bitcoin in that it is not a cryptocurrency. The fundamental purpose and nature of the technology is to develop enterprise-grade blockchain frameworks and tools. While Bitcoin enables peer-to-peer transactions without the need for intermediaries, Hyperledger is more geared towards facilitating business processes.
Hyperledger frameworks are often private, permissioned blockchains meaning permission to the network is limited to a small number of trusted users. On the other hand, Bitcoin is a public blockchain meaning anyone can participate in the network. Each uses a different form of consensus mechanism as well, as Bitcoin transactions are substantiated using a proof-of-work consensus mechanism while Hyperledger supports Byzantine fault tolerance or other algorithms.
As hinted to in the previous paragraph, Bitcoin is decentralized. This means no single entity owns it, and the system relies on the collection of the network's participants. Alternatively, Hyperledger is governed by the Linux Foundation.
Last, Bitcoin is not known for its smart contracts. It's primary use is to store value, not support complex programmability to facilitate agreements. Alternatively, Hyperledger offers greater smart contract capabilities. This allows businesses to engage in complex agreements relying heavily on logic to distribute assets on a blockchain network.
Is Hyperledger Better Than Ethereum?
Hyperledger provides a scalable, customizable, and permissioned blockchain solution for enterprise use cases with a focus on privacy and confidentiality. Should companies feel they need greater support with open development and innovation, Ethereum may be the more suitable option that offers a more robust platform with a larger developer community.
Is Hyperledger a Cryptocurrency?
Hyperledger isn't a cryptocurrency, though. The Linux Foundation is hosting a collaborative open-source project with the goal of creating enterprise-grade blockchain frameworks and tools. Hyperledger does not entail the development or use of a cryptocurrency and instead focuses on creating private, permissioned blockchain networks for corporate purposes.
What Coin Does Hyperledger Use?
There is no native coin for Hyperledger. It is a blockchain framework that puts the emphasis on creating enterprise-grade solutions rather than using or creating a particular coin or cryptocurrency.
The Bottom Line
The Linux Foundation is home to the Hyperledger open-source collaborative project which aims to provide business-grade blockchain frameworks and technologies. Businesses may build private, permissioned blockchain networks for a variety of use cases. Hyperledger uses include supply chain management and smart contracts, and Hyperledger is known for its modular and adaptable solutions.
This yearâs Hyperledger Global Forum, the annual gathering for big companies seeking the benefits of distributed ledger technology (DLT), opened in Phoenix, Ariz., with a film of a woman walking through a bamboo forest gathering up crimson thread.
The metaphor of traceability was hammered home in the Accenture flick, asserting that blockchain empowers people to buy from companies that share their values, giving consumers the info needed "to contribute to an inclusive green economy."
ESG (the new shorthand for environmentally minded corporate do-gooding) and how it overlaps with digital identity appeared to take center stage at this year's event, with perhaps less of an emphasis on banking consortia and trade finance blockchains.
Hyperledger Executive Director Brian Behlendorf said the ideal scenario is combining positive social impact with positive financial implications for the different participants, or a double bottom-line approach.
He gave the example of diamond-tracking blockchain Everledger, where there are real commercial reasons to want to verify a diamond didnât come out of a factory, but also it didn't come via slave labor.
âA blockchain purely for social impact might be challenging to get enough critical mass,â said Behlendorf.
Important new projects, including blockchain-enabled climate accounting to meet the goals of the Paris Agreement, are figuring out the right framework and incentives.Â
âThis will depend upon a regulatory environment and a trustworthy set of auditors, but also commercial motivation for companies to reduce their emissions â using the blockchain as a way to keep track of who is emitting what and getting credit for cutting your emissions,â said Behlendorf.
The Tesla example
Social-impact tracking platform Circulor, built in conjunction with Oracle using Hyperledger Fabric, began its life tracking cobalt from mines in the Congo. The startup is now attributing carbon footprints to the dynamic flow of materials (natural rubber and leather as well as electric car battery components) across the supply chains of Daimler and Volvo.
âThe reason this is important is that electric cars are worse for the planet than normal cars,â said Circulor CEO Doug Johnson-Poensgen. âWhy? Because the carbon footprint in the supply chain is bloody enormous.â
In other words, a Tesla Model 3 and a BMW 7 Series would both have to drive about 50,000 miles before their total carbon footprint was exactly the same. In the case of the gas-powered 7 Series, this is based on tailpipe emissions; but for the all-electric Model 3, itâs about the supply chain that built it â and half of that is the battery.
Politicians such as U.K. Prime Minister Boris Johnson who enthusiastically tout an all-electric-car future either choose to ignore this fact or simply donât understand it, said Johnson-Poensgen.Â
âBuilding that battery involves the carbon footprint of large-scale mining, multiple stages of chemical refining and itâs all geographically dispersed â mined in Africa, refined in China, turned into cathode in South Korea and then back to China to be turned into a battery,â he said. âAnd of course, China uses a lot of coal-fired electricity and are therefore a significant carbon consumer.â
Blockchain is an essential first step in accounting for this complexity.Â
Car manufacturers are interested because they all have carbon neutrality targets. Buying a slightly more expensive electric battery component from a manufacturer that uses hydropower could potentially knock five years off their carbon neutrality footprint.
âYou canât reduce something you canât measure,â said Johnson-Poensgen. âSo if this is the flow of my material and I understand the carbon footprint of each segment of transport or manufacture along that way, I can engage my tier-one suppliers, my battery manufacturer, for example, in a conversation about balancing sustainability with price. At the moment itâs all about price.â
Accountability
The carbon accounting problem was framed at a dizzying scale by Hyperledgerâs Climate Action and Accounting Special Interest Group.
The goal of the project, which also grew out of work done at Yale Open Innovation Lab, is to create a global climate accounting mechanism that can be compatible with the Paris Agreement.Â
There are certain climate accounting efforts that happened at the United Nations level that are essentially accountability of countries and their pledges, but big companies are also making these pledges.
Thatâs why an enterprise blockchain conference is a good place to build collaborations, said Martin Wainstein, the founder of the Yale Open Innovation Lab who co-chairs Hyperledgerâs climate action group.Â
âWe know the biggest climate actors today are the companies. But their type of pledges have very little accountability,â said Wainstein. âWhen big companies make these pledges itâs also because they know the next generation is angry, and those are their customers of the future.â
Exploring the role of digital transformation for a trusted climate accounting system has involved looking at blockchain and IoT and also things like the blockchain-based Spatial Web initiative, said Wainstein.
âYou have to think about a climate internet or a planetary internet that can talk about jurisdiction, spatial contracts, volumetrics and clear expression levels. Hyperledger has become a very interesting center of gravity around this.â
© Lidiia Moor/Getty Images Artificial general intelligence, or AGI, is closer than we think, though experts are torn on what it could actually look like. Lidiia Moor/Getty Images
- Blockchain technology could be a safeguard that prevents artificial intelligence from running amok, Coinbase said.Â
- Few crypto projects are currently working in AI, but there's a wide range of problems blockchain can address.Â
- Blockchain could help combat the spread of misinformation and shed light on AI decision-making.Â
The pace of development of artificial intelligence has been breathtaking, but with those strides in generative AI arise a myriad of problems experts say might only get worse as the technology becomes more sophisticated.
But there might be a guardrail that can be easily erected to prevent AI from running wild and turning our nightmares of robot overlords into reality. That necessary protective layer might be the blockchain.Â
That's according to Coinbase's head of research, David Duong, who writes in a new report that blockchain technology could address problems already cropping up in the booming AI space, while dealing with these issues could be a new frontier for crypto entrepreneurs.Â
"As applications within AI and blockchain mature, the disruptions these technologies represent may lead to areas of collaboration and the emergence of new use cases for crypto to help address specific societal challenges posed by AI," Duong wrote.Â
He lists five problems that have emerged with the advent of large language models that power chatbots like ChatGPT, along with solutions for each that blockchain and crypto might be able to address:Â
1. Demand for data resources - as generative AI relies on huge general databases to power its large language models, "A system of token incentives and penalties could ensure that the data meets the sufficient standards of quality needed by these models."
2. Demand for computational resources - Generative AI requires a lot of computing power, and blockchain could help by creating a system where resources are shared. "Decentralized networks of computing power can reward users who volunteer their idle GPUs to help relieve some of this computational burden."
3. Misinformation and disinformation - Fears of AI-driven misinformation campaigns have risen as large language models have the potential to digest false claims and spit them out as fact to users. "Blockchain and non-fungible token (NFT) technology can help combat this by establishing the provenance of images, video, music and other media."
4. Auditability - AI decision-making can be opaque to the normal user, and its algorithms inscrutable. "Integrating blockchain technology into AI models can help make those processes more transparent and allow users to scrutinize the logic and reliability of AI-produced outcomes."
5. Democratizing AI development and use - Finally, Duong wrote that crypto can make AI more accessible by allowing people to partake in its use and development on a larger scale. "Crypto platforms can help source a more diverse set of contributions, as well as redistribute access so more users can take advantage of its benefits (e.g. healthcare advice or e-commerce)."
Solidity programming has gained immense popularity in the world of blockchain development. As the language used for creating smart contracts on the Ethereum platform, it has become an essential skill for developers looking to build decentralized applications (DApps) and contribute to the blockchain ecosystem. practicing the top 20 books about Solidity programming that we have featured in this article can enhance your understanding and proficiency in this field.
Mastering Solidity: How to write production-ready smart contracts for Ethereum blockchainÂ
This book can assist you in improving your Solidity skills to create professional-level smart contracts. It begins with an in-depth introduction to blockchain, smart contracts, and Ethereum. It provides valuable insights into the Solidity programming language. The book also covers the various Ethereum Request for Comments (ERC) standards, such as ERC-20, ERC-223, and ERC-721, and shows you how to choose the appropriate standard for your smart contracts. In the later chapters, the book will cover various smart contracts that can be used with libraries like OpenZeppelin. You will also learn to use open source tools to test, review, and Strengthen your code to make it ready for production.Â
Solidity Smart Contracts: Build DApps In Ethereum Blockchain
This book aims to teach you simple and effective methods for becoming a blockchain developer. It will mainly focus on developing smart contracts using Solidity in the Ethereum ecosystem. You will learn to create your first smart contract in the Ethereum blockchain. The book also covers the features of Solidity programming language and how to use online IDE Remix to create smart contracts.
Mastering Blockchain: A technical reference guide to the inner workings of blockchain, from cryptography to DeFi and NFTs
This book is great for business executives seeking to use new platforms, students studying the technology, and blockchain development professionals looking to create secure transactional applications quickly. Prior knowledge of any programming language would be beneficial. It covers various subjects of blockchain, including technical aspects such as cryptography and consensus protocols, as well as practical applications like developing decentralized applications using smart contracts. It also delves into blockchain solutions beyond cryptocurrencies, such as IoT and enterprise blockchain, as well as tokenization. By practicing this book, you can gain insight into the future potential of this disruptive technology.
Hands-On Smart Contract Development with Solidity and Ethereum: From Fundamentals to Deployment
This guide will teach both experienced engineers and beginners how to build smart contracts for Ethereum. The guide covers the entire process from the fundamentals to builder mode. You will develop and test smart contracts, build a user interface for interaction, and explore further in the field with Kevin Solorio, Randall Kanna, and Dave Hoover. This resource is ideal for individuals who wish to enter the smart contract industry but lack guidance on how to begin.
Truffle Quick Start Guide: Learn the fundamentals of Ethereum development
This book is helpful for web developers who want to develop Dapps with Truffle. It will teach you how to write smart contracts and build Dapps using Truffle. The book covers the basics of Truffle, including how it integrates Solidity and Web3, and guides you through building a mini decentralized application. You will also learn about migration, testing, and integrating Truffle with popular JavaScript frameworks. Finally, you will finalize your decentralized application and turn it into a product. It will also teach you Truffleâs best practices to enhance your skills in building Dapps with Truffle.
Ethereum Smart Contract Development in Solidity
Many people believe that Blockchain is the next game-changing technology, with Ethereum as the leading product in Blockchain 2.0. However, developers are facing a significant challenge in coding and implementing business logic within a decentralized and transparent environment, which is different from traditional programming.
This book is a beginnerâs guide to Solidity, a programming language. It includes case studies, examples, and advanced topics, as well as an in-depth explanation of how smart contracts work. The book also features new examples to help readers better understand Solidity programming. Overall, the book aims to provide practical skills for readers to quickly begin programming with Solidity.
Readers should have prior knowledge of at least one object-oriented programming language in order to fully benefit from the book.
Ethereum Blockchain Developer â The Bootcamp
This book covers the basics of Solidity development workflows and best practices. Rather than focusing on in-depth technical theory, the book will guide you through completing a project to teach you these skills. The chapters are organized in an easy-to-understand format and cover all the important bits about the Ethereum blockchain and Smart Contract Development to help you get started on the right foot. It will show you how to create, test, and troubleshoot Smart Contracts. Furthermore, youâll gain expertise in using Smart Contracts in various situations and settings.
Beginning Ethereum and Solidity with React
This book teaches you how to develop decentralized applications (DApps) on the Ethereum blockchain using Solidity programming language. It is a fun and practical guide that will help you build your first Ethereum smart contract quickly. The content in this book is delivered in easy to understand sections without unnecessary information.
Solidity Programming Language 101: Beginner Guide
This book covers the basics of Solidity programming language and ERC-20 ICO Smart contract. It includes syntax and usage options, examples of program statements, functions, and contracts. The book also explains smart contracts, their functions, advantages, and potential uses. It also provides you with the entire source code for the ICO ERC-20 smart contract and provides instructions on how to deploy it. This should supply you a solid foundation in the Solidity programming language, allowing you to participate in and develop smart contracts on your own in the future.
Ethereum Cookbook: Over 100 recipes covering Ethereum-based tokens, games, wallets, smart contracts, protocols, and Dapps
The Ethereum Cookbook is a guide that covers a range of solutions for working with Ethereum, including setting it up, writing smart contracts, and creating tokens. You will gain insights on security vulnerabilities and other Ethereum protocols. Once you have a solid understanding of the basics, you will also learn about design tips to make your application more scalable and secure. The book also covers popular Ethereum packages, including Truffle, Web3, and Ganache.
Ethereum for Architects and Developers: With Case Studies and Code Samples in Solidity
This book provides a comprehensive guide to the Ethereum ecosystem, including theoretical explanations, practical labs, and examples of live use cases. subjects covered include Blockchain concepts, decentralized applications, Ethereumâs architecture, Solidity smart contract programming, as well as testing, debugging, and deploying smart contracts on both local and cloud-based machines. The book also includes best practices for writing high-quality contracts with optimized fuel usage, supported by numerous examples.Â
It discusses various use cases in later chapters. These use cases come from different business areas including finance, travel, supply-chain, insurance, and land registry. You can refer to flowcharts, diagrams, and trial code provided in the book to further Strengthen and use them in live projects. Â
After practicing the book, you will possess sufficient knowledge to apply Ethereum in creating value for your business processes and establishing secure data storage for more efficient business management.
Blockchain Quick Start Guide: A beginnerâs guide to developing enterprise-grade decentralized applications
This book provides a comprehensive introduction to blockchain and covers its workings in detail. The content includes exploring different consensus mechanisms and cryptographic hash functions used in blockchain technology. It also teaches the basics of programming in Solidity, which is the most commonly used language for creating decentralized applications on the Ethereum platform. The book will guide you through setting up a development environment for Ethereum and creating decentralized applications for campaigns. It will also explain how to install Hyperledger composer tools, analyze business situations, create business models, and write chain code.
By the end, it will help you gain a comfortable level of proficiency in working with basic blockchain frameworks. You will be able to develop secure, decentralized applications with ease by the end of it.
Building Ethereum DApps: Decentralized Applications on the Ethereum Blockchain
The book âBuilding Ethereum Dappsâ covers the development of Dapps using the Ethereum blockchain platform. It first provides an overview of how Dapps work before delving into creating smart contracts in Ethereumâs Solidity language. The book also covers development tools like Truffle and Web3, and offers guidance on design and security best practices. Included are practical exercises to gain hands-on experience.
Mastering Blockchain: Concepts, Code & Cryptocurrency: Ethereum, Solidity Smart Contract, Mining, Consensus, Security & Cryptocurrency Essentials
Itâs important for companies and managers to understand the potential of Blockchain technology and how it can be used to transform their business operations. This book covers all aspects of Blockchain technology including concepts, code, and cryptocurrencies, and is suitable for both business and technical managers. It consists of various subjects related to Blockchain such as its features, Smart Contracts, Mining, Consensus, Public and Enterprise Blockchains, Security, Data Storage, and Cryptocurrency essentials. The last two chapters are practical and involve exploring live Ethereum Blockchain and learning to develop, deploy, and test Smart Contracts using Solidity and Remix IDE.
Advanced Blockchain Development: Build highly secure, decentralized applications and conduct secure transactions
This book will teach you how to create blockchain networks with Ethereum, JavaScript, and Solidity. It begins by explaining the technical basics of blockchain technology, such as distributed systems and cryptography, and how this digital ledger protects information. As you progress through the chapters, youâll learn about building applications with Ethereum and Hyperledger. As you expand your understanding of Ethereum security, mining, smart contracts, and Solidity, youâll be able to create strong and secure applications that execute programmed instructions without being impacted by fraud, censorship, or third-party intervention.
Beginning Ethereum Smart Contracts Programming: With Examples in Python, Solidity, and JavaScript
If youâre uncertain about how to connect to the Ethereum Blockchain and where to start, the book âBeginning Ethereum Smart Contracts Programmingâ is the quickest and most effective way to get started. It provides a foundational discussion of blockchain and its purpose, followed by a detailed explanation of how to use an Ethereum client (geth) to connect to the Ethereum Blockchain and perform transactions like sending Ethers to another account.
This book will offer a practical approach to learning about smart contracts, saving you from the hassle of practicing complex documentation. Leeâs âlearn-by-doingâ method helps you develop productivity and confidence in smart contracts quickly. The final part of the book focuses on tokens, a popular Topic in the cryptocurrency market. The book includes trial code in Python, Solidity, and JavaScript.
Smart Contracts Creation and Deployment On Ethereum Blockchain
âSmart Contracts Creation and Deployment On Ethereum Blockchainâ is a comprehensive guide, perfect for those interested in diving into the dynamic world of blockchain technology. This book is designed to familiarize you with the fundamental concepts of blockchain, explain how to set up Ethereum on a Windows system, and enlighten you on the usage and nuances of Solidity variables and types. You will also learn to compile and deploy smart contracts on JavaScriptVM and on test networks, using hands-on, practical examples such as deploying an ERC20 token smart contract. Beyond just coding, the book also provides a unique perspective on creating ERC-20 smart contracts and executing crowd sales (ICO) without requiring extensive coding knowledge. By leveraging tools like Token Wizard, you can create and deploy Ethereum ERC-20 Tokens and conduct Crowd Sales (ICO) on both test and main networks. The book balances theoretical concepts with engaging tutorials, making it an indispensable resource for both beginners and experienced blockchain enthusiasts.
Rendezvous with Practical Solidity: A COMPLETE HANDS ON BOOK
This book provides practical knowledge for learning the Solidity language, which is revolutionary. It offers deep practical depth through code recipes and step-by-step environment setup instructions, along with the output of each recipe. Readers can verify the output instantly on Remix or a local environment. As a result, developers and architects will find this book to be a unique offering. It includes trial code and is suitable for beginners, advanced programmers, and enterprise architects. You can explore and enhance your knowledge with detailed examples on every aspect of Solidity in this book.
Building on Ethereum: With Solidity and React
Learning how to develop Ethereum smart contracts raises several questions, such as which language to use, what blockchain technology is necessary, which frameworks are best for building the UI, and how the project structure should be organized. The book covers most of these subjects and also addresses issues that may arise as your project grows. The author of this book doesnât try to provide a complete definition of every term or make it a definitive reference for Ethereum development, as the field is changing rapidly. Instead, the book guides you through the different choices youâll face when starting a project and expanding it beyond basic levels.
Smart Contract Development with Solidity and Ethereum: Building Smart Contracts with the Azure Blockchain
This book provides a detailed explanation of the fundamental concepts of Blockchain and guides readers in creating a Smart Contract easily. It is suitable for both beginners and advanced readers who wish to revisit the process of developing Smart Contracts. The book covers the basics of Blockchain, including its terminology, workflow, and cryptographic principles. Readers will also gain familiarity with Ethereum and some of the distributed Apps available on the platform. You will learn how to set up Ethereum Blockchain on Azure.
Conclusion
As the demand for blockchain developers continues to grow, understanding Solidity programming becomes increasingly valuable. By delving into the top 20 books about Solidity programming, you can acquire the knowledge and skills necessary to develop secure and efficient smart contracts, enabling you to participate in the exciting world of decentralized applications and blockchain technology.
One name that consistently stands out in Blockchain technology is Solidity. This high-level programming language has become a key player in the blockchain arena, enabling developers to build sophisticated decentralized applications (dApps) on the Ethereum platform. But what exactly is Solidity? Who should learn it, and what prerequisites are required to master this language? In this article, weâll delve into these questions, exploring the foundations of Solidity, its varied use cases in the blockchain ecosystem, and why it has become a must-learn language for aspiring blockchain developers.
What is Solidity?
Solidity is a statically typed, high-level programming language specifically designed for developing smart contracts on the Ethereum blockchain platform. Launched in 2014, it allows developers to write smart contracts, creating agreements that carry out actions without requiring a middleman.
The language was developed by the Ethereum Foundation to enable developers to build a wide range of decentralized applications (dApps) that run on the Ethereum blockchain. Solidity has syntax similar to JavaScript and C++, making it easier for developers with backgrounds in these languages to learn and adapt.
One of Solidityâs defining features is its focus on security. It allows for complex authorization procedures for contracts, ensuring that a program on Ethereum will only perform actions that have been explicitly authorized by the user.
What are the use cases of Solidity?
Solidity is primarily used for creating smart contracts for applications that are run on the Ethereum blockchain, the second-largest blockchain platform in the world. Here are a few prominent use cases:
Decentralized Finance (DeFi): DeFi platforms are the most popular use case of Solidity. These platforms offer financial services like loans, insurance, and exchanges, but in a decentralized and transparent manner. They are built on smart contracts coded in Solidity.
Non-Fungible Tokens (NFTs): NFTs are unique tokens that represent ownership or proof of authenticity of a particular asset. Artists and creators across the globe are increasingly using NFTs to monetize their digital work. The smart contracts for creating and managing NFTs are primarily written in Solidity.
Decentralized Autonomous Organizations (DAOs): DAOs are organizations that are run by code and a set of rules enforced on a blockchain, eliminating the need for centralized control. DAOs use smart contracts to handle their internal mechanics, including voting and fund distribution, which are typically written in Solidity.
Who should learn Solidity?
Anyone interested in the field of blockchain and decentralized application development should consider learning Solidity. Here are a few specific groups who may find it particularly beneficial:
Web Developers: If youâre a web developer looking to expand your skills into a burgeoning field, Solidity is a fantastic place to start. With syntax similarities to JavaScript and C++, itâs easier for developers to grasp.
Blockchain Enthusiasts: If youâre passionate about the potential of blockchain technology to revolutionize various industries and want to be part of that change, learning Solidity is almost a necessity. Itâs the primary language for creating smart contracts on Ethereum, the platform at the forefront of the blockchain revolution.
Career Changers: With the rise of DeFi, NFTs, and blockchain technology, thereâs a high demand for Solidity developers. If youâre looking for a new, lucrative career path, this could be a good option. Even basic knowledge of Solidity could be a valuable addition to your CV.
Entrepreneurs: If you have a startup idea that could benefit from the transparency, security, and decentralization offered by blockchain technology, learning Solidity could help you understand the technical feasibility and implementation of your idea.
Learning Solidity opens up a world of opportunities in the exciting and innovative field of blockchain and decentralized applications. Itâs an investment in a future where blockchain is increasingly becoming an integral part of our digital lives.
Best sources to learn solidity from
Solidity, Blockchain, and Smart Contract Course by FreeCodeCamp.org
This blockchain developer course is the most viewed of all time because it covers everything you need to know about blockchain development, making it an ideal way to start your career.
The resource covers basic concepts initially and progresses towards advanced subjects such as upgradeability, efficient testing, and full-stack development. It follows a project-based learning approach where each lesson culminates in a complete project that you can showcase on your GitHub.
This resource is intended for engineers who have some knowledge of Python. However, if you donât have any prior experience, freecodecamp can help you get started.
To avoid being overwhelmed, please take breaks while going through the course material as there is a lot of information to cover. Feel free to ask any questions you have either on the GitHub discussions or on Stack Overflow.Â
What will you learn?
- Introduction to Blockchain, Solidity, and Smart Contracts
- Understanding DeFi, NFTs, and other famous blockchain platforms
- Getting complete knowledge of blockchain development
If you want to have more comprehensive knowledge with detailed videos, you should consider taking this YouTube course to Strengthen your skills.
Cryptozombies
Cryptozombies is a widely used course for learning about blockchain and solidity programming. It features a gamified platform that teaches you how to build a zombie army using step-by-step instructions. The user interface is engaging and suitable for all ages, making it one of the most accessible resources available. The course covers essential subjects such as NFTs, inheritance, and basic solidity programming, with clear explanations provided by the Cryptozombies team.
Learn Solidity: Main Concepts and Principles Explained by BitDegree
If you prefer a systematic approach to learning, you may find this article on BitDegree helpful for understanding Solidity. It covers the fundamentals and introduces key concepts of the language, outlining a path for mastering Solidity and becoming an Ethereum Developer.
What will you learn?
- Purpose and uses of Solidity programming language
- Major concepts and principles to take care of in Solidity
Ethereum Blockchain Developer Bootcamp With Solidity on Udemy
If youâre not familiar with programming, you can still start your career as an Ethereum Developer by enrolling in the Ethereum Blockchain Developer Bootcamp. This program covers everything from basic to advanced Solidity concepts and offers step-by-step video tutorials to help you grasp the material effectively.
What will you learn?
- Solidity Programming through projects and applications
- Gaining theoretical and practical knowledge of smart contracts
- Using Ethereumâs Major Core Development Tools
- Using Web3 along with course projects
This course is designed to teach you everything you need to know to become an Ethereum Developer. By the end of the course, you will have gained proficiency in Solidity, Web3, Remix, Metamask, Truffle, and several other concepts.
Blockchain Certification Training Course by Edureka
Edureka offers a Blockchain Certification Training Course designed by top industry experts, which covers all the necessary knowledge in one place. The course covers fundamental concepts of Blockchain along with platforms, such as Ethereum, MultiChain, Bitcoin, and Hyperledger. Hands-on demonstrations are also included to facilitate the understanding of the Ethereum ecosystem.
What will you learn?
- Working on Blockchain platforms and Cryptocurrency basics
- Ethereum and Solidity programming basics and advanced learning
- Developing Private Blockchain on MultiChain
- Complete setup of development environment using Hyperledger
If you have a technical background and are considering improving your skills and advancing your career, you should check out the Blockchain Certification Training Course on Edureka. Itâs an ideal course for you.
Learn Solidity: Programming Language for Ethereum Smart Contracts by Blockchain Council
The Certified Solidity Developer Certification is an exam-based certification that offers comprehensive knowledge of smart contract development through Solidity. Industry experts have put together the curriculum, and earning this certification can qualify you as a smart contract developer. This is a highly sought-after skill in the global job market. Obtaining the Certified Solidity Developer certification can enhance your career in the Blockchain field.
What will you learn?
- Basics of Ethereum, Smart Contracts, and other blockchain platforms
- Installing and setting up Solidity Development Environment
- Building live applications and deploying smart contracts in Solidity
This course will equip you with the skills to build various blockchain applications on the Ethereum network using Solidity. It can serve as a launching point for your career as a Blockchain Developer.
Are there any prerequisites to learning Solidity?
Before diving into Solidity, itâs beneficial to have some prior knowledge in specific areas. This foundation will make your journey smoother, and hereâs why these prerequisites are crucial:
Understanding of Ethereum Blockchain: Since Solidity is used to write smart contracts on the Ethereum blockchain, a fundamental understanding of Ethereum and how its blockchain works is essential. You should know about Ethereum accounts, gas, Ether, transactions, and how they are validated on the network. Itâs also good to understand how smart contracts work on a conceptual level before trying to write one yourself.
Basic Programming Knowledge: Solidityâs syntax is similar to that of JavaScript and C++, so familiarity with either of these languages (or another similar language) can be very helpful. Understanding variables, functions, data types, control structures (like loops and conditionals), and object-oriented principles will provide a solid foundation for learning Solidity.
JavaScript and Node.js: While itâs not required, understanding JavaScript and Node.js can be highly beneficial. Many tools used for Solidity development, like Truffle and Hardhat, use Node.js, and front-end interactions with smart contracts often require JavaScript.
Understanding of Cryptography: Blockchain technology and, by extension, Solidity, heavily rely on cryptographic principles. Understanding concepts like public-private key encryption, hash functions, and digital signatures can provide useful context for why certain features of Solidity and Ethereum are designed the way they are.
Patience and Perseverance: Like any other programming language, learning Solidity will involve moments of frustration and confusion. Debugging smart contracts can be challenging, especially since once theyâre deployed on the blockchain, they canât be modified. Therefore, being patient, diligent, and maintaining a problem-solving attitude is critical for your learning journey.
Conclusion
Solidity serves as the backbone for developing decentralized applications and smart contracts on the Ethereum blockchain. Its versatility and applicability in various fields such as DeFi, NFTs, DAOs, and blockchain gaming makes it an attractive skill set for web developers, blockchain enthusiasts, entrepreneurs, and those looking to transition into an exciting, innovative career field.Â
Having some prerequisites like a basic understanding of Ethereum blockchain, familiarity with JavaScript and C++, some insight into cryptography, and a patient, problem-solving mindset can smoothen your Solidity learning journey. Overall, learning Solidity is a strategic move towards being part of the ongoing blockchain revolution, offering plentiful opportunities for those ready to seize them.
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Archipels, a French digital identity consortium and project based on blockchain technology, has raised an unknown amount of capital from IN Groupe to fuel its expansion.
The French ID solutions firm was founded in the 1500s as the French national printer, and specializes in the production of secure documents and personal IDs. These products include French national electronic identity cards, as well as passports for nations all over the world including Lebanon and France itself. They also include a project in Africa which is expanding in partnership with Entrust.
IN Groupe, which now takes a spot on the board of Archipels, will have an equal ownership stake to its other founding shareholders, French public sector investor Caisse des DĂ©pĂŽts and Franceâs largest postal firm La Poste.
The Paris-based project says it plans to increase its footprint in international markets, primarily Europe and North Africa, as well as speed up commercial development and expand its decentralized identity services.
Archipels says it aims to double its headcount by the end of 2024, in departments such as sales, partnerships, product development, and technical functions, and also plans to double its customer base by the end of 2023.
Archipels is part of two consortia made up of several European Union member states and industrialists, set up to manage the pilotâs deployment of the European digital identity wallet (EUDI Wallet) commissioned by the European Commission. It is also an Associate Member of the Secure Identity Alliance.
The EUDI wallet is an upcoming mobile phone app that promises citizens of the EUâs 27 constitutional countries a way to store and share digital identity data.
HervĂ© Bonazzi, CEO of Archipels, says that by working with companies such as IN Groupe and Docapost, the consortium will be âable to benefit from synergies and accelerate the adoption of our technologies by a greater number of companies and organizations.â
Didier Trutt, chairman and CEO of IN Groupe, adds: âOur entry into Archipelsâ capital is part of the execution of IN Groupeâs 2025 Digital Odyssey strategy around identities and digital services of the future, in physical and digital environments.â
This investment is a key step in the development and deployment of decentralized identity solutions that can guarantee sovereignty for governments and data security for users.â
The news comes the European digital identity (EUDI) wallet which Archipels is involved in is attracting significant amounts of funding for its own expansion.
Earlier this month, The European Commission announced it is set to invest âŹ46 million (roughly US$49 million) into the European digital identity (EUDI) wallet, in the form of four pan-European pilot programs.
Archipels, founded in 2020 and with a current headcount of roughly 18, has already won some important domestic projects. In December 2022, The Banque de France appointed Archipels to work on the issue of authentication and digital identity for credit institutions.
IN Groupe and Entrust expand partnership for African governmentâs identity program
IN Groupe has also expanded its partnership with Entrust to modernize an unnamed African governmentâs identity program.
The companies said this will Strengthen security and scalability to help address identity challenges in the present and future.
The expansion will see IN Groupe utilize the Entrust Datacard MX Series Card Issuance System, a hardware solution which allows users to print their own electronic cards, alongside its âDrop on Demandâ printing technology.
This system will allow for a durable and modern card format according to companies, while also providing new security features.
In addition, the companies say the MX Seriesâ technology will allow the African government to implement electronic identity credentials as part of their ID issuance program in the future.
The news follows Entrust winning a contract with the UK government in April 2023, which will see it use its technology to aid the digitization of the UK immigration system.
âOur customers need technology that can help them find a balance between strong security and the ability to scale from a capacity and feature perspective,â says Yann Haguet, vice president of Identity Strategic Business Unit at IN Groupe. âBecause weâve had a long-standing partnership with Entrust, we have a deep knowledge of their solutions and are confident that together we can bring to our customers the peace of mind that their identities will be more secure now and into the future.â
The implementation of digital identity programs in Africa has some significant proponents.
Last month, The Tony Blair Institute for Global Change found South African residents could save $620 million annually from the introduction of such a program for opening of bank and electronic money accounts, with the greatest economic benefits flowing to the elderly and rural women.
Similar programs in Rwanda and CĂŽte dâIvoire were predicted to save $9.7 million annually and $43.7 million respectively.
Many African countries are already working with Western firms on the development of their national digital identity systems.
Togo recently brought on board Atos and Idemia for the implementation of its planned national ID program. The West African countryâs MOSIP (Modular Open-Source Identification Platform) based system is set to include data from finger, face and iris scans.
Article Topics
Africa  | Archipels  | biometrics  | blockchain  | digital identity  | Entrust  | Europe  | IN Groupe  | investment
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