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Cryptocurrency, or crypto asset, is digital value that relies on cryptographic security and is often recorded on a distributed ledger, a shared record kept by many computers rather than one institution. Bitcoin, Ethereum, and stablecoins are all described as crypto assets, but they work differently, serve different purposes, and carry different risks. This guide explains each concept in plain language, shows where the risks come from, and notes where the rules differ between the United Kingdom and the United States.
What cryptocurrency is
A cryptocurrency is a digital asset whose ownership and transfer are secured using cryptography. The UK Financial Conduct Authority (FCA) uses the term crypto asset for this category, and many crypto assets are recorded on a distributed ledger. Some are used as a means of payment, some give holders rights within a particular network, and some are primarily traded as speculative assets. The category is broad, so it is a mistake to assume that every token has the same design, backing, purpose, or level of decentralisation.
The number of crypto assets is also larger than most beginners expect. In early 2023 the FCA said there were over 20,000 cryptocurrencies, many of which were no longer traded. That is a dated count from 2023, not a current total, but it illustrates why a name on an exchange list says little on its own about what sits behind it.
What a blockchain is
A blockchain is one type of distributed ledger. Records are grouped into blocks, and each block is linked to the one before it using cryptographic techniques, so that changing an earlier record would require altering every later block as well. In a public, decentralised network, many participants can hold and check the same record, and no single central authority controls who can read it or add to it.
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That description applies to the design of the network, not to every product sold with the word “crypto” attached. Some crypto assets are recorded on ledgers that are private, permissioned, or run by a company, and the properties above may not apply to them. When you see a claim that something is “on the blockchain”, the useful follow-up question is who runs the network and who can change the record.
How cryptocurrency works in practice
Each crypto asset has its own network of computers, called nodes, that keep copies of the ledger and agree on which transactions are valid. When someone sends an asset, the transfer is broadcast to the network, checked against the existing record, and added to a new block. Once enough of the network accepts that block, the transfer is treated as settled. The exact rules for checking and agreeing on blocks differ between networks, which is one reason the same word can describe very different systems.
Ownership is usually controlled through a pair of cryptographic keys. The private key is the secret that authorises a transfer; whoever holds it can move the asset. The public key, or the address derived from it, is what others use to send value to you. Losing the private key, or having it copied, generally means losing control of the asset, and a blockchain cannot tell whether the person sending a transfer is its rightful owner.
Holdings are stored in a wallet. A wallet does not contain the coins themselves, which exist only as entries on the ledger. It holds the keys needed to sign transfers. Wallets can be hosted by an exchange or platform, which keeps the keys on your behalf, or be controlled by you directly. That distinction, called custody, matters a great deal in the risk section below.
Bitcoin, Ethereum, and stablecoins compared
These three names are often used together, but they describe different things. Bitcoin (BTC) is a crypto asset and the FCA describes it as the longest-running cryptocurrency, created in 2009 after a white paper describing it appeared in 2008. Ethereum is a network, and Ether (ETH) is the crypto asset associated with it. Stablecoins are a category of crypto asset designed to keep their value linked to a reference asset, such as a fiat currency, but individual designs differ.
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Bitcoin
Bitcoin is best understood as a decentralised digital asset and the network that records its transfers. It is the reference point for most discussion of crypto, and its history is the longest of any crypto asset. Bitcoin’s design focuses on recording transfers of its own asset; it is not usually described as a platform for building general-purpose applications.
Ethereum and Ether
Ethereum is a network that supports smart contracts, which are programs stored on the ledger that run automatically when specified conditions are met. Ether is the crypto asset used within that network. The distinction matters: Ethereum is the system that runs programs, while Ether is the token that the system uses. A smart contract can be useful, but it can also contain errors or be written to behave in ways its users do not expect, so the existence of a programmable network is not a safety guarantee.
Stablecoins
A stablecoin is designed to hold a steady value relative to a reference asset, most often a fiat currency such as the pound or the US dollar. The way it tries to do this varies. Some are backed by reserves held by the issuer, others use different mechanisms, and the quality and disclosure of reserves differ from one issuer to another. A peg is an intention, not a promise. A stablecoin can trade below its reference value, and the people who hold it may depend on the issuer’s reserves and operations in ways that are not obvious from the name.
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| Feature | Bitcoin (BTC) | Ethereum network and Ether (ETH) | Stablecoins |
|---|---|---|---|
| What it is | A crypto asset and its network | A network supporting smart contracts; ETH is its associated crypto asset | A category of crypto asset designed to track a reference asset |
| Role of the token | Recorded transfers of the BTC asset | Used within the Ethereum network, including to run smart contracts | Intended to hold a stable value against a reference |
| Programmable applications | Not its defining feature | Yes; smart contracts run when specified conditions are met | Depends on the individual stablecoin’s design |
| Intended reference | None; value is market-determined | None; value is market-determined | A reference asset, such as a fiat currency; the peg is not guaranteed |
| Main risks to understand | Price volatility, custody, platform failure | Price volatility, smart-contract errors, custody, platform failure | Reserve quality, peg failure, issuer risk, custody, platform failure |
The table is a conceptual comparison only. It does not rank these assets as investments, and each row can vary across individual products within the same category.
Recent price movements as a reminder of volatility
The FCA’s crypto guidance, last updated on January 29, 2026, gives historical figures that show how sharply prices can move. The data were sourced from CoinGecko, as stated on the FCA page. These are past examples, not current prices, and they do not predict future performance.
- Bitcoin reached £93,947 on October 6, 2025. On December 1, 2025 it was £65,350, a 30.44% decrease from that peak.
- Ether reached £3,685.98 on August 24, 2025. On December 1, 2025 it was £2,119.90, a 42.49% decrease from that peak.
Prices after the dates above may be materially different. Check a current, reliable price source before relying on any figure.
Is cryptocurrency safe?
The honest answer is that it depends on which risk you mean. Crypto does not carry a single level of safety. Price risk, platform risk, wallet risk, and your own behaviour are separate sources of loss, and protection against one does not automatically protect you from the others.
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Crypto prices can be highly volatile. The FCA says that crypto investments are high-risk and speculative, and that investors should be prepared to lose all of the money they put in. The CFTC’s consumer advisories make the same point about volatility. A holding that looks secure in one month can lose a large share of its value in another, even without any fraud or technical failure.
Platform risk
Many people buy and hold crypto through an online platform. The CFTC warns that some cash-market platforms may not be supervised in the way readers might expect, and that customer safeguards can be deficient. If a platform fails, is hacked, or misuses customer funds, recovering assets may be difficult or impossible. In the UK, the FCA says that Financial Services Compensation Scheme coverage is highly unlikely for crypto-related losses, so you should not assume that a loss will be compensated.
Wallet and custody risk
Who holds the keys determines who controls the asset. If a platform holds your keys, you depend on its security and solvency. If you hold your own keys, you become responsible for keeping them safe, and a lost or stolen private key cannot be reversed by a bank or regulator. The CFTC advises readers to research digital wallets before choosing one, and warns about hacking and phishing aimed at getting access to keys or login details. A wallet does not remove the risks of fraud or theft; it changes where those risks sit.
Scams and manipulation
The CFTC identifies manipulation, hacking, phishing, and scams as recurring concerns. Common warning signs include promises of guaranteed returns, pressure to act quickly, and offers that cannot clearly explain what the token does or how the money raised will be used. The CFTC’s advisory, titled “Use Caution When Buying Digital Coins or Tokens” and prepared by its Office of Customer Education and Outreach and LabCFTC, states: “There is no such thing as a guaranteed investment or trading strategy.” The advisory does not name an individual author.
Rules and protections depend on where you live
The legal status of crypto is not the same across countries, and it is not the same across products within a country. This guide cites UK and US official sources, and the descriptions below apply only to those jurisdictions. They should not be read as a global rule.
United Kingdom
The FCA’s “Crypto: The basics” page, first published on February 17, 2023 and last updated on January 29, 2026, is the main UK source used here. It warns that crypto investments are high-risk and speculative and that compensation coverage is highly unlikely for crypto-related losses. The FCA page is a consumer guide and does not decide whether any particular token is regulated or what protections apply to a specific product. You can read it at https://www.fca.org.uk/investsmart/crypto-basics.
United States
In the US, two federal agencies provide the most relevant official guidance. The Securities and Exchange Commission (SEC) published “Crypto Assets and the Federal Securities Laws” on April 22, 2026, with a later review or update recorded on May 15, 2026. That page covers crypto assets, digital commodities, collectibles, tools, stablecoins, and tokenized securities within the scope of its federal securities discussion. The Commodity Futures Trading Commission (CFTC) advisories cover its commodity and derivatives remit and note limits on its oversight of cash markets. Whether a particular asset or transaction falls under a given law depends on its specific features and applicable law. The SEC page is at https://www.sec.gov/resources-small-businesses/capital-raising-building-blocks/crypto-assets-federal-securities-laws.
The CFTC’s consumer advisories are also worth reading directly. “Use Caution When Buying Digital Coins or Tokens” is at https://www.cftc.gov/LearnAndProtect/AdvisoriesAndArticles/caution_of_digital_currencies.html, and “Understand the Risks of Virtual Currency Trading” is at https://www.cftc.gov/LearnAndProtect/AdvisoriesAndArticles/understand_risks_of_virtual_currency.html. Neither advisory shows a publication date in the copy reviewed for this guide, so check the page for its current wording.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteQuestions to answer before you buy any crypto asset
These questions follow from the risks above. They are a checklist for understanding a product, not a recommendation to buy or sell anything.
- What rights does the token give its holder, if any?
- How will the money raised from selling the token be used?
- Who holds the keys, and what happens to my assets if that party fails?
- Which regulator oversees the platform I would use, and in which country?
- Am I being offered a guaranteed return, or pressured to act quickly?
- Can I afford to lose the full amount I put in?
Tax treatment varies by jurisdiction and by transaction, and this guide does not cover it. For personal decisions about tax, investment, or legal matters, use current guidance from your local official sources or a qualified professional.
What to do next
If you want to go further, read the FCA page and the CFTC advisories linked above, and compare any product you are considering against the checklist. Treat every price figure in this guide as a historical example, and confirm current prices, regulatory status, and platform terms before making a decision.
This guide is general information and is not investment, legal, or tax advice.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
