Crypto — Honest Pros and Cons
No hype, no dismissal — just a clear-eyed look at what crypto is and is not
What Blockchain Actually Is
A blockchain is a distributed database — a ledger of transactions — that is maintained simultaneously across thousands of computers rather than a single central server. When a transaction is recorded, it is verified by multiple nodes in the network and added as a "block" to a chain of previous transactions. Because the record is distributed and cryptographically linked, altering a past transaction would require changing every subsequent block on every copy of the ledger simultaneously — computationally prohibitive. The result is a tamper-resistant record of transactions without a central authority.
This is genuinely useful in some contexts: cross-border payments without intermediary banks, supply chain verification, digital ownership records, and smart contracts (self-executing code on a blockchain). The technology has legitimate applications. Whether any specific cryptocurrency captures the value of those applications is a separate question.
Bitcoin vs Altcoins
Bitcoin (BTC) is the original cryptocurrency (launched 2009), with a hard-capped supply of 21 million coins, the largest network effect, and the clearest narrative: digital gold, a hedge against currency debasement, a store of value. It is the most liquid, most regulated, and most institutionally held cryptocurrency. It is also extremely volatile — it has lost 50–80% of its value multiple times.
Altcoins (everything else) range from projects with genuine utility (Ethereum's smart contract platform, for example) to outright scams. The crypto market is largely unregulated and contains thousands of tokens, the majority of which will eventually be worthless. The signal-to-noise ratio is very low. Any altcoin promising guaranteed returns, revolutionary technology with no working product, or celebrity endorsement is a red flag.
Volatility, Regulatory Risk, and Scams
Bitcoin's standard deviation of annual returns is approximately 80–100% — meaning a ±80% year is within normal historical parameters. This is roughly five to ten times the volatility of equities. The potential for large gains is real and documented; so is the potential for losses that would be career-ending for a professional fund manager.
Regulatory risk is ongoing and underappreciated. Crypto markets are subject to policy decisions — exchange bans, wallet requirements, tax treatment changes, CBDC competition — that can move prices significantly and are difficult to predict. The UK's FCA has required crypto firms to register and has banned certain retail derivatives; the EU's MiCA regulation introduces a broader framework from 2024.
The scam landscape is extensive. Common scams include: fake exchanges, rug pulls (developers abandoning a project after raising funds), phishing attacks targeting wallet credentials, romance scams using crypto as the payment mechanism, and fake investment platforms promising unrealistic returns. If something promises guaranteed crypto returns above 10–20% annually, it is a scam.
UK tax treatment: Crypto is subject to Capital Gains Tax in the UK. Gains above the CGT allowance (£3,000 in 2024/25) are taxed at 18% (basic rate) or 24% (higher rate). Crypto-to-crypto trades, spending crypto, and gifting crypto (other than to a spouse) are all taxable disposal events, not just selling to pounds. HMRC requires you to track your cost basis for every disposal.
Position Sizing If You Choose to Invest
If you choose to invest in crypto after understanding the risks, the standard risk management principle applies: invest only what you can genuinely afford to lose entirely, without it affecting your financial plan. Many experienced investors who include crypto apply a ceiling of 1–5% of their total portfolio.
Stick to the most liquid assets (Bitcoin, and possibly Ethereum) unless you have deep technical knowledge of specific projects. Do not keep significant crypto on exchanges — use a hardware wallet for long-term holdings. Keep records of every transaction for tax purposes from day one.
FAQs
Is crypto a good inflation hedge?
Bitcoin was marketed as a digital gold inflation hedge, but its correlation with risk assets (particularly US tech stocks) during the 2022 inflation period undermined this narrative. It fell sharply as interest rates rose — the opposite of what a pure inflation hedge should do. The narrative is contested.
Should I put crypto in a pension or ISA?
Crypto cannot be held in a standard UK ISA. SIPPs (Self-Invested Personal Pensions) can technically hold some crypto-linked assets (ETFs tracking Bitcoin futures, for example) but the FCA has restricted direct crypto in pensions for most providers.
What happened to people who bought at the 2021 peak?
Bitcoin peaked at approximately $69,000 in November 2021 and fell to approximately $16,000 by November 2022 — a 77% decline. Most altcoins fell more. Many retail investors who bought near the peak lost 70–90% of their investment. This is not a worst-case scenario; it is recent history.
Is crypto legal in the UK?
Yes. Crypto ownership and trading are legal in the UK. Firms offering crypto services to UK retail customers must register with the FCA. Gains are taxable under CGT. The UK does not ban crypto but has restricted certain high-risk products (CFDs on crypto) for retail investors.
Key takeaways
- Blockchain is genuinely useful technology; whether any specific cryptocurrency captures that value is a separate, contested question.
- Bitcoin has a documented record; most altcoins will eventually be worthless — the signal-to-noise ratio in crypto markets is very low.
- Standard annual volatility of Bitcoin is 80–100% — multiple times equity market volatility — making position sizing critical.
- UK CGT applies to every disposal event (including crypto-to-crypto swaps), not just converting to pounds.
- If you invest, limit exposure to 1–5% of total portfolio, stick to the most liquid assets, and keep records of every transaction from day one.