Crypto: the 5 costliest beginner mistakes (and how to avoid them)
Published on 24/10/2026
When you start out in crypto, the most expensive mistakes almost never come from the choice of crypto itself. They come from everything around it: the platform you pick, the price you actually pay, a promise that sounds too good, a poorly protected recovery phrase or a badly copied address. The good news: each one can be avoided with a simple habit.
This guide goes through the five costliest beginner mistakes, and the habit that avoids each one. It applies in every country of the European Union and is not investment advice.
- Buying on a platform without checking its authorisation.
- Looking only at the advertised fees.
- Believing a promise of returns, or an “adviser” who contacts you unprompted.
- Failing to protect your recovery phrase.
- Sending your crypto to the wrong address or the wrong network.
01Mistake 1: buying without checking the platform's authorisation
An ad on social media, a well-rated app, a friend who recommends it: many beginners pick their platform without checking that it is allowed to serve them.
Why it costs so much. Since 1 July 2026, a platform serving customers in the European Union must be authorised under the MiCA Regulation. An unauthorised platform gives you none of the Regulation's protections: segregation of your assets, conduct rules, complaint handling. And even with an authorised provider, there is no deposit guarantee comparable to that of bank accounts.
The habit. Find the name of the legal entity in the legal notice, then check that it appears in the MiCA register published by ESMA.
02Mistake 2: looking only at the advertised fees
“0% commission”, “reduced fees”: the percentage put forward is rarely what you really pay.
Why it costs so much. The real cost of a purchase adds up several items: the commission, the spread (the gap between the price you are charged and the market price), deposit fees depending on whether you pay by bank transfer or by card, and withdrawal fees. A platform with no commission can earn its revenue entirely from the spread, and cost more than a platform that displays its fees. On regular purchases, the gap adds up.
The habit. Compare the amount of crypto you actually receive for the same sum invested, not the advertised percentage.
03Mistake 3: believing a promise of returns or an “adviser” who contacts you unprompted
A message on a messaging app, a call from an “adviser”, an influencer promising to multiply your stake, a platform displaying guaranteed regular gains: these are the most frequent scam scenarios in crypto.
Why it costs so much. Once your crypto has been sent to a scammer, the transaction is irreversible: there is no chargeback as with a bank card. The European Supervisory Authorities (EBA, EIOPA and ESMA) renewed their warning to consumers in October 2025, pointing to misleading advertising, aggressive promotion on social media and scams. Beware of a second wave too: fake services that promise to recover lost money, for a fee.
The habit. No high return is guaranteed in crypto: a promise of this kind is a warning sign in itself. Never respond to unsolicited contact, never transfer anything to someone you did not look up yourself, and always check the entity with Uncrypt Check before sending a single euro.
04Mistake 4: failing to protect your recovery phrase
If you keep your crypto in your own wallet, your recovery phrase (seed phrase), 12 or 24 words, gives full access to your funds. Photographing it, storing it in your notes or in an email, or typing it into a site that asks for it, is like leaving the key to the safe on the door.
Why it costs so much. Anyone who knows this phrase can empty your wallet, from anywhere. Conversely, if you lose it and your device fails, nobody can reset it for you: access to your crypto is lost.
The habit. Write it down on paper or on a metal plate, offline, and store it somewhere safe. Never type it into a site or a form, and never share it with anyone: no legitimate service will ask for it. To choose where to keep your crypto, read our guide to hot and cold wallets.
05Mistake 5: sending your crypto to the wrong address or the wrong network
A crypto address is a long string of characters, and the same crypto can travel on several different networks (blockchains). A badly copied address, or a transfer on a network the recipient does not support, is enough to lose the funds.
Why it costs so much. On a blockchain there is no bank and no customer service to cancel a transfer. A destination error is generally final. Some malware even replaces the copied address with a hacker's at the moment you paste it.
The habit. Copy and paste the address rather than retyping it, then check the first and last characters before confirming. Check that the network chosen is the same on both sides. For a first transfer to a new address, start with a small test transfer.
06The 5 beginner crypto mistakes: summary
| Mistake | What it can cost | The habit |
|---|---|---|
| Unchecked platform | No MiCA protection | Check the authorisation in the ESMA register or with Uncrypt Check |
| Advertised fees only | A real cost higher than expected | Compare the amount received, spread included, with the Simulator |
| Promise of returns, unsolicited contact | Funds sent to a scammer, with no recourse | Never respond, check the entity before any transfer |
| Recovery phrase exposed or lost | Access to your crypto | Write it down offline, never type it or share it |
| Wrong address or wrong network | Funds lost for good | Copy and paste, check, send a test transfer |
07Frequently asked questions
Which mistake should a crypto beginner avoid first?
Choosing a platform without checking that it is authorised. It is also one of the easiest to avoid: all it takes is looking up its legal entity in ESMA's MiCA register, or going through Uncrypt Check.
How do you spot a crypto scam?
The most common signs: a promised or guaranteed return, unsolicited contact, pressure to act fast, a request for your recovery phrase, or an entity that cannot be found in the official registers. A single one of these signs is enough to stop.
Can you recover crypto sent by mistake?
Generally, no. A transaction confirmed on a blockchain cannot be cancelled. If the error concerns a transfer between two platforms, their customer service can sometimes help, with no guarantee. Beware of services that promise to recover your funds in return for payment.
Is my crypto guaranteed if my platform goes bankrupt?
There is no deposit guarantee for crypto comparable to that of bank accounts. However, a platform authorised under MiCA for custody must keep your assets separate from its own: they are not part of its estate in the event of insolvency.
08Avoid two of these mistakes with Uncrypt
Two of these mistakes play out before your first purchase: the choice of platform and the price you will actually pay. Uncrypt has a tool for each.
- Uncrypt Check verifies a platform's MiCA authorisation status, with a link to the official register.
- The Uncrypt Simulator estimates the real cost of a purchase, spread included, so you can compare what you actually receive.
Further reading:
- Buying your first bitcoin in Europe: the step-by-step guide.
- Exchange, broker or custodian: who sets the price, who holds your crypto-assets.
- Where to store your crypto: platform, third party, hot wallet or cold wallet.
Sources: EBA, EIOPA and ESMA, joint warning to consumers on crypto-assets, 6 October 2025: ESMA press release ↗, Regulation (EU) 2023/1114 (MiCA): text on EUR-Lex ↗, ESMA, MiCA page and register of authorised providers ↗. Last verified: 24/10/2026.
