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A1 noun #2,275 よく出る 12分で読める

blockchain

練習する 例文 メモとヒント blockchain 30秒で
解説 blockchain in your Level:
At the A1 level, we keep the explanation of 'blockchain' very simple. Imagine you have a special digital notebook. You write something in this notebook, like 'I gave my friend five dollars.' Now, imagine that thousands of other people have the exact same notebook. When you write in your notebook, the words magically appear in everyone else's notebook at the same time. Because everyone has a copy of the notebook, nobody can erase or change what you wrote without everyone else noticing. If someone tries to cheat and change the number to 'fifty dollars', the other notebooks will say, 'No, that is wrong!' and stop them. This special, shared digital notebook is called a blockchain. It is a way for computers to share information safely. People use it mostly for digital money on the internet. It helps keep the money safe because no single person is in charge of the notebook. Everyone works together to keep it correct. It is like a big team of computers protecting the information. You cannot touch it because it is inside the computer. It is very new, but many people are talking about it. When you hear this word, just think of a safe, shared digital list.
At the A2 level, we can add a little more detail. A blockchain is a type of digital record or list that is shared among many computers on the internet. The word has two parts: 'block' and 'chain'. Think of a 'block' as a digital box that holds information, like a list of people who sent money to each other. When the box is full of information, it is closed and locked. Then, it is attached to the previous box, making a 'chain' of boxes. This is why it is called a blockchain. The most important thing about it is that it is very safe. Because the chain is shared across many computers, it is almost impossible for a hacker to change the information inside a locked box. If they try to change one box, they would have to change all the boxes on all the computers at the same time, which is too hard. People use this technology for cryptocurrencies like Bitcoin. It allows people to send money directly to each other without needing a bank in the middle. The computers in the network check the transactions to make sure they are real. It is a new and exciting way to store data safely.
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At the B1 level, learners can understand the practical applications and basic mechanics. A blockchain is a decentralized digital ledger. 'Decentralized' means that there is no central boss or company controlling it, like a bank or a government. Instead, the ledger is maintained by a large network of independent computers around the world. Every time a new transaction happens, these computers communicate with each other to verify that the transaction is legitimate. Once they agree, the transaction is grouped with others into a 'block'. This block is then cryptographically sealed and added to the existing 'chain' of previous blocks. This creates a permanent and unchangeable history of all transactions. Because the ledger is distributed and secured by complex math, it provides a very high level of security and transparency. Anyone on a public network can view the history of transactions, but no one can alter past records. While it is most famous for powering digital currencies, businesses are now exploring how to use blockchain for other things, such as tracking products in a supply chain, securing medical records, or creating digital contracts that execute automatically when conditions are met.
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At the B2 level, we introduce more technical vocabulary and abstract concepts. Blockchain technology is essentially a distributed database that maintains a continuously growing list of ordered records, called blocks. These blocks are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data. By design, a blockchain is inherently resistant to modification of the data. It is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for inter-node communication and validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without alteration of all subsequent blocks, which requires consensus of the network majority. This immutability is what makes the technology so revolutionary. It solves the 'double-spending' problem without the need for a trusted central authority or central server. Beyond finance, industries are leveraging blockchain to enhance transparency, improve traceability, and reduce costs by eliminating middlemen in complex processes.
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At the C1 level, the focus shifts to the systemic impact and nuanced technical aspects. A blockchain is a foundational technology that enables the creation of decentralized, immutable, and transparent digital ledgers. It operates on a peer-to-peer network architecture where nodes utilize consensus algorithms—such as Proof of Work or Proof of Stake—to validate and append new transactions to the ledger. The cryptographic linking of blocks ensures that the historical record is tamper-evident; any attempt to alter a past block invalidates the cryptographic hash, immediately alerting the network to the malicious activity. This paradigm shift from centralized trust to cryptographic proof has profound implications for various sectors. It facilitates the deployment of 'smart contracts'—self-executing code residing on the blockchain that automates agreements without intermediaries. Furthermore, blockchain technology underpins the burgeoning Web3 ecosystem, promising a more decentralized internet where users retain control over their data and digital assets. However, the technology is not without its challenges, including significant scalability issues, high energy consumption in certain consensus models, and complex regulatory hurdles as governments grapple with how to classify and govern decentralized networks.
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At the C2 level, the explanation encompasses the profound socio-economic and architectural disruptions caused by the technology. Blockchain represents a paradigm-shifting architecture in distributed systems, fundamentally redefining the mechanics of digital trust and value transfer. At its core, it is a Byzantine fault-tolerant distributed ledger that utilizes cryptographic primitives to achieve consensus in a trustless environment. By abstracting the necessity of a centralized intermediary, blockchain mitigates counterparty risk and eliminates single points of failure. The immutability of the ledger, secured via cryptographic hashing and consensus protocols, provides an unprecedented level of auditability and provenance. This architectural innovation extends far beyond the realm of decentralized finance (DeFi) and cryptocurrencies. It is catalyzing the development of decentralized autonomous organizations (DAOs), revolutionizing supply chain provenance, and enabling self-sovereign identity frameworks. The discourse surrounding blockchain at this level also critically examines the 'blockchain trilemma'—the inherent trade-offs between decentralization, security, and scalability. As the technology matures, the integration of layer-2 scaling solutions and interoperability protocols is crucial for its transition from a novel cryptographic experiment to a ubiquitous, enterprise-grade infrastructure underpinning the next generation of digital interaction.
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練習する 例文 メモとヒント

blockchain 30秒で

  • A shared digital notebook.
  • Stored on many computers.
  • Very hard to hack or change.
  • Used for digital money and data.
A blockchain is essentially a shared digital record or ledger that many different computers keep at the exact same time. Imagine a notebook that is duplicated thousands of times across a massive network of computers. Whenever someone wants to add a new line or a new page to this notebook, every single computer in the network must check the new information, agree that it is correct, and then update their own copy of the notebook simultaneously. This means that no single person or organization controls the entire notebook, making it incredibly difficult for anyone to cheat, hack, or change the information secretly. The word itself gives you a clue about how it works: 'block' and 'chain'. Information is stored in chunks, which are called blocks. Once a block is completely full of data, it is locked and securely attached to the block that came immediately before it, creating a continuous chain of information.
Block
A digital container that holds a specific amount of data or transactions.

Every transaction is recorded on the blockchain.

Because these blocks are linked together using complex mathematics and cryptography, altering any single piece of information in an older block would require changing every subsequent block across every computer in the network. This is practically impossible, which is why blockchain is celebrated for its high level of security and transparency.
Decentralization
The concept of spreading control and power away from a central authority.

The new software uses a blockchain to keep data safe.

In traditional systems, we usually rely on a central authority, like a bank or a government, to keep our records safe and accurate. We trust them to manage the ledger. However, a blockchain removes the need for this central middleman. Instead, trust is placed in the technology, the mathematics, and the collective agreement of the network. This revolutionary way of storing and sharing data was originally invented to support the digital currency Bitcoin, but people quickly realized that the underlying technology could be used for much more than just money. Today, people are exploring ways to use it for voting systems, tracking the supply chain of food and goods, securing medical records, and managing digital identities.
Ledger
A book or digital file where financial or other important records are kept.

They built a secure blockchain for the hospital.

It is important to remember that while it is highly secure, it is not entirely perfect. The computers that run the network consume a lot of electricity, and the system can sometimes be slower than traditional databases because every computer has to process every transaction.

Learning about blockchain can help you understand the future of finance.

Despite these challenges, many experts believe that this technology will fundamentally change how we interact, trade, and trust each other on the internet in the coming decades.

The company invested millions in blockchain research.

By distributing the data, we create a system that is robust, transparent, and highly resistant to tampering or censorship.
Using the word 'blockchain' correctly in English involves understanding its grammatical role and the common verbs and prepositions that accompany it. First and foremost, it is a noun. It can be used as a countable noun when referring to a specific network, such as 'the Ethereum blockchain' or 'a private blockchain'. It can also be used as an uncountable noun when referring to the technology in a general sense, such as 'Blockchain is changing the world'.
Countable Noun
A noun that can be counted and has a plural form, like 'two blockchains'.

We are building an application on the blockchain.

When talking about where data is stored, we typically use the preposition 'on'. You store data 'on the blockchain', record transactions 'on a blockchain', or build applications 'on the blockchain'. You do not usually say 'in the blockchain', although it is sometimes used informally. The most common verbs used with this word relate to creation, utilization, and security. Companies 'develop', 'build', 'implement', or 'adopt' blockchain technology. Data is 'secured by', 'recorded on', or 'verified through' a blockchain.
Preposition 'On'
Used to indicate that something is attached to or supported by a surface or network.

The contract is stored safely on the blockchain.

You will also frequently see it used as an adjective or a modifier in compound nouns. For example, people talk about 'blockchain technology', 'blockchain developers', 'blockchain networks', or 'blockchain projects'. In these cases, the word describes the type of technology, developer, network, or project. It is also important to note the context in which you are speaking. In casual conversation, you might simply say 'They use blockchain for that', treating it as a broad, uncountable concept. In a technical or business meeting, you might need to be more specific, saying 'We are deploying a permissioned blockchain for our supply chain'.
Modifier
A word that describes or limits another word, often a noun acting like an adjective.

She works as a blockchain engineer.

Another common usage pattern involves discussing the benefits or features of the technology. You might hear phrases like 'the transparency of the blockchain', 'the immutability of the blockchain', or 'blockchain-based solutions'. These phrases highlight the specific advantages that the technology provides over traditional databases.

Our new system is a blockchain-based platform.

Finally, when discussing the future, it is often paired with verbs of transformation. People say that it will 'revolutionize', 'disrupt', or 'transform' various industries.

Many believe blockchain will disrupt the banking industry.

Understanding these grammatical patterns and common collocations will help you sound much more natural and confident when discussing this modern technological advancement in English.
You will hear the word 'blockchain' in a wide variety of contexts today, as it has moved from a niche technical term to a mainstream buzzword. The most common place you will encounter it is in discussions about finance, money, and economics. Because it is the underlying technology for cryptocurrencies like Bitcoin and Ethereum, financial news networks, investment blogs, and banking conferences constantly discuss its impact.
Cryptocurrency
A digital or virtual currency that uses cryptography for security.

The news anchor talked about blockchain and Bitcoin.

You will hear financial analysts debating whether traditional banks will adopt blockchain to speed up international money transfers or if it will eventually replace traditional banking altogether. Another major area where this word is prevalent is in the technology sector. Software developers, IT professionals, and tech entrepreneurs use it daily. If you listen to tech podcasts, read tech blogs, or attend technology conferences, you will hear presentations on how to build decentralized applications (dApps) or how to improve the scalability of different networks.
Tech Sector
The part of the economy made up of companies focused on electronics, software, and internet services.

The tech startup uses blockchain to protect user data.

Beyond finance and tech, the word is increasingly heard in supply chain management and logistics. Companies that ship goods around the world are exploring how to use this shared digital record to track products from the factory to the store shelf. For example, you might hear a coffee company explain how they use a blockchain to prove that their coffee beans were ethically sourced, allowing customers to scan a QR code and see the entire journey of the beans.
Supply Chain
The sequence of processes involved in the production and distribution of a commodity.

We track our shipments using a secure blockchain.

The art and gaming worlds have also embraced the term recently, largely due to the rise of NFTs (Non-Fungible Tokens). Artists, gamers, and collectors talk about 'minting' digital art on the blockchain to prove ownership and authenticity.

He sold his digital artwork on the blockchain.

Finally, you might even hear it in government and legal contexts. Politicians and lawyers are beginning to discuss how blockchain could be used to create secure digital voting systems, manage property deeds, or automate legal contracts through 'smart contracts'.

The government is testing a blockchain voting system.

As the technology matures, the contexts in which you hear this word will only continue to expand, making it a crucial vocabulary word for understanding the modern world.
When learning and using the word 'blockchain', there are several common mistakes that English learners and even native speakers frequently make. The most prevalent mistake is confusing 'blockchain' with 'Bitcoin' or 'cryptocurrency'. While they are closely related, they are not the same thing. Bitcoin is a specific digital currency, whereas blockchain is the underlying technology or the digital ledger that allows Bitcoin to exist and function.
Bitcoin
The first and most well-known cryptocurrency.

Bitcoin is a currency, but blockchain is the technology behind it.

Saying 'I bought some blockchain' is incorrect; you buy cryptocurrency, which is recorded on a blockchain. Another common grammatical mistake is using it as a verb. People sometimes try to say 'I will blockchain that data' or 'We need to blockchain this process'. This is incorrect in standard English. It is strictly a noun. Instead, you should use verbs like 'store', 'record', or 'secure' along with the noun. For example, 'I will store that data on the blockchain' or 'We need to secure this process using blockchain technology'.
Noun vs Verb
A noun is a thing, while a verb is an action. This word is always a thing.

We will record the transaction on the blockchain.

Learners also frequently make mistakes with prepositions. As mentioned earlier, the correct preposition for placing data is 'on'. Saying 'The information is in the blockchain' is less natural and often considered incorrect by tech professionals. It should be 'The information is on the blockchain'. Pluralization can also be tricky. When referring to the general concept or the technology as a whole, it is uncountable and does not take an 's'. You say 'Blockchain is the future', not 'Blockchains are the future'. However, when referring to specific, separate networks (like the Bitcoin network and the Ethereum network), it becomes countable, and you can say 'There are many different blockchains'.
Pluralization
Adding an 's' to make a word plural. Only do this for specific networks.

Different blockchains have different rules.

Finally, a conceptual mistake is assuming that all blockchains are public and visible to everyone. While the most famous ones are public, many companies build 'private' or 'permissioned' blockchains where only authorized users can see or add to the digital record.

The bank uses a private blockchain for security.

Understanding these distinctions will prevent confusion and ensure you use the term accurately in both casual and professional settings.

She explained the blockchain concept perfectly.

Avoiding these common pitfalls will make your English sound much more natural and technologically literate.
When discussing 'blockchain', there are several related terms and similar words that often come up in conversation. Understanding these related words can help you grasp the broader context of the technology. The most common synonym or descriptive phrase is 'distributed ledger'. A ledger is a record book, and 'distributed' means it is shared across many locations.
Distributed Ledger
A database that is consensually shared and synchronized across multiple sites.

A blockchain is a type of distributed ledger.

Therefore, every blockchain is a distributed ledger, but not every distributed ledger is necessarily a blockchain (though in everyday conversation, people often use them interchangeably). Another related word is 'database'. A database is simply an organized collection of data stored on a computer. A blockchain is essentially a very specific, highly secure type of database. However, a traditional database is usually controlled by one person or company (centralized), while a blockchain is controlled by many (decentralized).
Database
A structured set of data held in a computer, especially one that is accessible in various ways.

The blockchain acts as a secure database for the network.

You will also frequently hear the word 'network'. A network is a group of interconnected computers. Because this technology relies on many computers working together to verify the data, the term 'blockchain network' is very common. The word 'cryptocurrency' is constantly associated with it. As mentioned before, cryptocurrency is the digital money (like Bitcoin) that uses this technology to record who owns what.
Network
A group or system of interconnected people or things.

Thousands of computers support the blockchain network.

Another modern term you might encounter is 'Web3'. Web3 refers to a new vision for the internet that is decentralized and built on blockchain technologies. It represents a shift away from the current internet (Web2), which is dominated by large, centralized tech companies.

Web3 relies heavily on blockchain technology.

Finally, words like 'smart contract' and 'node' are important related vocabulary. A smart contract is a self-executing computer program stored on the ledger, and a node is simply one of the individual computers participating in the network.

Each node keeps a copy of the blockchain.

By learning these similar and related words, you will be able to navigate conversations about modern technology, finance, and the future of the internet with much greater ease and comprehension.

How Formal Is It?

難易度

知っておくべき文法

Compound Nouns (noun + noun = new noun)

Prepositions of Place (on vs in for digital spaces)

Countable vs Uncountable Nouns

Noun Adjuncts (using a noun as an adjective)

Passive Voice (data is stored on the blockchain)

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レベル別の例文

1

A blockchain is like a digital notebook.

digital notebook

Noun used with 'a' to introduce the concept.

2

Many computers share the blockchain.

share the

Direct object of the verb 'share'.

3

The blockchain keeps the money safe.

keeps safe

Subject of the sentence performing an action.

4

I read about blockchain on the internet.

read about

Object of the preposition 'about'.

5

Bitcoin uses a blockchain.

uses a

Direct object of 'uses'.

6

The blockchain is very new.

is very new

Subject with the 'be' verb and an adjective.

7

We cannot change the blockchain.

cannot change

Object of the negative verb phrase.

8

A blockchain has many blocks.

has many

Subject showing possession.

1

They use blockchain to send money quickly.

use to send

Used with an infinitive of purpose.

2

Information on the blockchain is very secure.

on the

Prepositional phrase modifying 'Information'.

3

A hacker cannot break the blockchain.

cannot break

Direct object of the verb 'break'.

4

Every block in the blockchain is full of data.

in the

Prepositional phrase showing location.

5

She wants to learn how blockchain works.

how works

Subject of the dependent clause.

6

The bank is testing a new blockchain.

testing a new

Direct object with an adjective.

7

Blockchain technology is growing very fast.

technology is growing

Used as a noun adjunct (modifier).

8

You need a computer to connect to the blockchain.

connect to

Object of the preposition 'to'.

1

The company decided to build their app on the blockchain.

build on the

Preposition 'on' used for platforms.

2

Because it is decentralized, the blockchain is hard to control.

hard to control

Subject of the main clause after a dependent clause.

3

Transactions are recorded permanently on the blockchain.

recorded permanently

Passive voice construction.

4

He invested in a startup that focuses on blockchain solutions.

focuses on

Noun adjunct modifying 'solutions'.

5

The transparency of the blockchain prevents fraud.

transparency of

Object of the preposition 'of'.

6

Many people believe blockchain will change the future of finance.

will change

Subject of a noun clause.

7

Each node in the network keeps a copy of the blockchain.

copy of the

Object of the preposition 'of'.

8

They created a private blockchain for their internal records.

private

Modified by the adjective 'private'.

1

Blockchain technology eliminates the need for a central authority.

eliminates the need

Noun adjunct acting as the subject.

2

The immutability of the blockchain ensures data integrity.

immutability ensures

Object of the preposition 'of'.

3

Smart contracts execute automatically on the blockchain.

execute automatically on

Prepositional phrase indicating location/platform.

4

Supply chain logistics can be vastly improved by implementing blockchain.

implementing

Object of the gerund 'implementing'.

5

Developers are working to solve the scalability issues of the blockchain.

scalability issues of

Object of the preposition 'of'.

6

The protocol relies on consensus to add new blocks to the blockchain.

add to the

Object of the preposition 'to'.

7

Cryptographic hashing secures the data stored within the blockchain.

stored within

Object of the preposition 'within'.

8

They are exploring permissioned blockchains for enterprise use.

permissioned

Plural countable noun modified by 'permissioned'.

1

The decentralized architecture of the blockchain mitigates single points of failure.

mitigates single points

Object of the preposition 'of'.

2

Blockchain enables trustless transactions between anonymous counterparties.

enables trustless

Subject of the active verb 'enables'.

3

The transition to Proof of Stake significantly reduced the blockchain's energy consumption.

energy consumption

Possessive form using an apostrophe 's'.

4

Interoperability between different blockchains remains a significant technical hurdle.

between different

Plural noun as the object of 'between'.

5

The immutable ledger provided by the blockchain is ideal for auditing purposes.

provided by the

Object of the preposition 'by' in a passive phrase.

6

Regulatory frameworks are struggling to keep pace with blockchain innovation.

keep pace with

Noun adjunct modifying 'innovation'.

7

Deploying a decentralized application on the blockchain requires specialized coding skills.

Deploying on the

Prepositional phrase modifying the gerund phrase.

8

The cryptographic primitives underlying the blockchain ensure robust security.

underlying the

Direct object of the participle 'underlying'.

1

Blockchain's distributed ledger technology fundamentally disrupts traditional centralized paradigms.

fundamentally disrupts

Possessive form acting as a determiner.

2

The Byzantine fault tolerance inherent in the blockchain protocol ensures consensus despite malicious actors.

inherent in the

Object of the preposition 'in'.

3

Tokenomics design is critical for incentivizing participation in a public blockchain ecosystem.

public blockchain ecosystem

Noun adjunct modifying 'ecosystem'.

4

Zero-knowledge proofs are being integrated into the blockchain to enhance privacy without sacrificing verifiability.

integrated into the

Object of the preposition 'into'.

5

The proliferation of layer-2 solutions aims to resolve the blockchain trilemma.

resolve the

Noun adjunct modifying 'trilemma'.

6

Self-sovereign identity frameworks leverage blockchain to return data ownership to the individual.

leverage

Direct object of the verb 'leverage'.

7

The immutability of the blockchain renders retroactive alteration of the historical record computationally infeasible.

renders retroactive alteration

Object of the preposition 'of'.

8

Enterprise adoption of blockchain hinges on the development of robust interoperability standards.

hinges on the development

Object of the preposition 'of'.

類義語

distributed ledger digital ledger shared ledger decentralized database DLT

反対語

centralized database traditional ledger

よく使う組み合わせ

on the blockchain
blockchain technology
blockchain network
public blockchain
private blockchain
build on blockchain
secure with blockchain
blockchain developer
blockchain platform
blockchain-based

よく使うフレーズ

stored on the blockchain
recorded on the blockchain
powered by blockchain
the future of blockchain
blockchain use cases
blockchain ecosystem
implementing blockchain
blockchain adoption
blockchain innovation
blockchain startup

よく混同される語

blockchain vs Bitcoin

blockchain vs Cryptocurrency

blockchain vs Database

慣用句と表現

"set in stone (conceptually similar to immutability)"
"a chain is only as strong as its weakest link"
"cut out the middleman"
"source of truth"
"single version of the truth"
"trust but verify"
"level the playing field"
"break the mold"
"paradigm shift"
"the writing is on the wall"

間違えやすい

blockchain vs

blockchain vs

blockchain vs

blockchain vs

blockchain vs

文型パターン

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使い方

formal

Use 'blockchain technology' or 'distributed ledger technology'.

informal

Just 'blockchain' or sometimes 'crypto' (though technically inaccurate).

technical

Specify 'public', 'private', or 'permissioned' blockchain.

よくある間違い
  • Saying 'I bought a blockchain' instead of 'I bought cryptocurrency'.
  • Writing 'block chain' as two words.
  • Saying 'in the blockchain' instead of 'on the blockchain'.
  • Using it as a verb: 'We will blockchain it.'
  • Confusing it entirely with Bitcoin.

ヒント

Preposition Use

Always use the preposition 'on' when talking about where data is located. Say 'on the blockchain', not 'in the blockchain'. This is similar to saying 'on the internet'.

Noun, Not Verb

Remember that 'blockchain' is a noun. You cannot 'blockchain' something. You must use a verb like 'store' or 'record' before it.

Not Bitcoin

Do not use 'blockchain' and 'Bitcoin' as synonyms. Bitcoin is the money; blockchain is the technology. Keeping this clear shows you understand the topic.

One Word

It is always spelled as one single word: 'blockchain'. Do not write it as two words ('block chain') or with a hyphen ('block-chain').

Stress the First Syllable

When speaking, put the emphasis on the first part of the word: BLOCK-chain. This makes you sound more natural and fluent.

Professional Context

In a business setting, it is often better to say 'blockchain technology' rather than just 'blockchain'. It sounds more formal and precise.

Distributed Ledger

Learn the phrase 'distributed ledger'. Using this phrase shows a high level of vocabulary and a deep understanding of what the technology actually is.

When to add 's'

Only add an 's' (blockchains) when you are talking about multiple, different networks (like Ethereum and Solana). If you are talking about the idea, keep it singular.

Using as an Adjective

You can use it to describe other nouns, like 'blockchain developer' or 'blockchain project'. When used this way, it never takes an 's'.

Web3 Connection

If you see the term 'Web3', know that it relies heavily on blockchain. Understanding one will help you understand the other.

暗記しよう

語源

Coined by Satoshi Nakamoto in 2008.

文化的な背景

Often associated with crypto slang like 'HODL', 'To the moon', and 'WAGMI'.

Viewed with both excitement and skepticism by traditional Wall Street.

Highly valued in Silicon Valley and tech hubs worldwide.

実生活で練習する

実際の使用場面

会話のきっかけ

"Do you think blockchain will replace traditional banks?"

"Have you ever bought anything using blockchain technology?"

"What is the difference between Bitcoin and blockchain?"

"How can blockchain improve online security?"

"Is blockchain just a trend, or is it the future?"

日記のテーマ

Write about a time you had to trust a company with your data. How would a blockchain change that?

Imagine a world where all voting is done on a blockchain. What are the pros and cons?

Explain the concept of a blockchain to a child.

Research a non-financial use of blockchain and describe it.

Do you trust decentralized systems more or less than centralized ones? Why?

よくある質問

10 問

No, they are not the same. Bitcoin is a digital currency. Blockchain is the technology that makes Bitcoin possible. Think of blockchain as the operating system and Bitcoin as an app running on it. You can have blockchain without Bitcoin.

It is extremely difficult to hack a well-established blockchain. Because the data is copied across thousands of computers, a hacker would need to control more than half of all the computers at the exact same time. This is called a 51% attack. For large networks, this is practically impossible due to the cost and computing power required. However, the apps built on top of it can sometimes be hacked.

No single person or company owns a public blockchain like Ethereum or Bitcoin. It is owned and maintained by the people who use it and the computers that run the software. This is what 'decentralized' means. However, a private company can create and own a private blockchain for their own internal use.

It is called a blockchain because of how it stores data. Information is collected together in groups, which are called 'blocks'. When a block is full, it is locked and mathematically connected to the block that came before it. This creates a continuous 'chain' of blocks.

No, you cannot 'buy' blockchain. It is a technology, like the internet. You can buy cryptocurrencies that run on a blockchain, or you can buy shares in companies that build blockchain technology. But the technology itself is just a system of rules and software.

No, while it started with digital money, it can be used for much more. It can store any kind of digital information securely. People use it for tracking supply chains, storing medical records, and creating digital art (NFTs). Any system that needs a secure, shared record can use it.

A node is simply a computer that is connected to the blockchain network. Every node keeps a copy of the entire blockchain. When new information is added, all the nodes talk to each other to make sure the information is correct. They work together to keep the network safe.

Some blockchains, like Bitcoin, use a system called 'Proof of Work' which requires a massive amount of electricity. This has raised environmental concerns. However, many newer blockchains use different systems, like 'Proof of Stake', which use 99% less energy. The technology is evolving to become more green.

To put data on a public blockchain, you usually have to pay a small fee using cryptocurrency. You use a digital wallet or a special application to send a transaction. The network of computers then verifies your transaction and adds it to the next block. Once it is there, it cannot be removed.

It is unlikely to replace all databases. Traditional databases are much faster and cheaper to run if you only need one company to control the data. Blockchain is only useful when you need multiple people who don't trust each other to share a secure record. They serve different purposes.

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自分をテスト 180 問

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Perfect score!

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関連コンテンツ

Technologyの関連語

abautoal

C1

さまざまなデータ構造または言語単位の自動的な整合と統合のための体系的な方法論または技術フレームワークであり、手動介入なしで同期を保証します。

abautoence

C1

自己管理メカニズムまたは自律ルーチンを通じてプロセスを体系的に自動化または合理化すること。効率を最大化し、認知負荷を軽減するために、手動タスクをバックグラウンドの技術的または習慣的なシステムに委任する行為を指します。

ablogtion

C1

ablogtionとは、オンライン上の評判を管理するために、プラットフォームからデジタル記録や時系列のログエントリを体系的に削除、消去、またはスクラブすることを意味します。

abmanless

C1

完全な自動化を通じて、システムから手動の人間による介入の必要性を取り除くこと。

activation

B2

アクティベーション（有効化）とは、装置やソフトウェアを使える状態にすることです。例えば、新しいスマホの初期設定などです。

actuator

B2

アクチュエータは、電気や空気のエネルギーを物理的な動きに変える機械部品です。

adpaterable

C1

システムやデバイスをアダプターに対応できるように改造または設定すること。

adpaterward

C1

アダプターワード（adapterward）とは、初期組み立て後に技術システムに統合される二次的な調整または補足コンポーネントであり、新しい規格との互換性を確保します。これは、レガシー部分と最新部分との間の後期同期を容易にする物理的またはデジタルの「ブリッジ」を具体的に指します。

aerospace

B2

地球の大気圏内または宇宙空間を飛行する航空機や宇宙船の設計、製造、運用に関連するもの。

algorithms

B2

アルゴリズムとは、ある特定の問題を解くための、段階的な手順や計算方法のことです。

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