Crypto security: how to protect your crypto, step by step
Crypto security is everything you do to protect your crypto from theft and loss: securing your exchange account, keeping your private keys away from anyone else, protecting your devices, and choosing a platform you can trust. It matters more than in banking because crypto transactions cannot be reversed, so stolen crypto is rarely returned. The good news is that a few habits stop most attacks and protect digital assets of any size.
What is crypto security, in plain words?
Crypto security means making sure that only you can move your crypto. Because there is no bank to call to undo a transfer, the job falls largely on you and on the platform you choose.
It helps to separate three layers:
- Blockchain security: the network itself. Large public blockchains are very hard to attack, because thousands of computers on a distributed network validate transactions and record them on a decentralized ledger.
- Platform security: the exchange or app that holds your crypto. This is where large hacks happen.
- Personal security: your passwords, devices, private keys and habits. This is where most individual losses happen.
Attackers rarely break the maths. Cyber criminals go for the easier targets: people, passwords and phones. That applies to any digital currency, from the most popular cryptocurrency to a small token: unlike most financial assets, whoever controls the keys controls the money.
Blockchain security: can the network be hacked?
Blockchain technology itself is the strongest layer. On a large blockchain network such as the bitcoin network, thousands of nodes record transactions and check every signature made with public and private keys. A double spend attack would need control of most of the network’s computing power or stake, which is extremely expensive on the biggest chains. Smaller networks are easier targets, and apps and smart contracts built on top add additional risks. Your public key and address are visible to everyone by design; they cannot be used to gain access to your funds.
The main threats: crypto cybersecurity basics
The main threats to your crypto are well known, which makes them easier to defend against. Security experts see the same pattern again and again: potential threats change, but most attacks target people.
| Threat | How it works | Main defence |
|---|---|---|
| Phishing scams | Fake websites, apps or emails steal your login or seed phrase | Type addresses yourself; never enter a seed phrase online |
| SIM swap | A criminal moves your phone number to their SIM and receives your SMS codes | App-based 2FA or a security key, not SMS |
| Malware | Software on your computer or mobile devices steals keys or swaps addresses | Updated devices, official apps only |
| Exchange hacks | Attackers break into a platform’s wallets | Do not keep everything on one exchange |
| Fake support | ”Support staff” ask for codes or remote access | Real support never asks for passwords or seed phrases |
| Physical theft | Someone takes your device or backup, or forces you to unlock it | Keep holdings private; protect backups |
For ordinary users, phishing and other cryptocurrency scams are a bigger risk than technical attacks on the blockchain itself. If someone contacts you first, treat it as a warning sign. Cyber criminals also use security breaches at companies, such as leaked customer lists, to make their messages look genuine.
Crypto wallets: hot wallets vs cold wallets
The biggest security decision is where your private keys live. Crypto wallets come in two main types, and most people need both.
Hot wallets are connected to the internet: an exchange account, a mobile wallet or a browser extension. They are convenient for buying, selling and paying, but every online wallet is reachable by attackers.
Cold wallets keep your private keys, and so your assets, offline. The most common type is a hardware wallet, a small physical device that signs transactions inside itself, so your keys never touch the internet and you keep physical possession of them. Paper wallets, where a key is printed on paper, also count as cold storage, but they are easy to damage, lose or copy, and are a poor choice for most people today. If you still have old paper wallets, move the funds to a newer wallet.
A sensible split for many investors: keep a small amount for trading in a hot wallet or on a licensed exchange, and the rest in cold storage. For example, if you hold €3,000 in crypto, you might keep €300 on the exchange and move the rest to a hardware wallet. Using multiple wallets, one for daily use and one for savings, limits the damage if one is compromised.
Custodial vs self-custody cryptocurrency wallets
With a custodial wallet, such as an exchange account, the platform holds the keys and you depend on its security measures. A custodial wallet is easier to recover if you forget your password, because the platform can verify you and restore access. With self-custody, you hold the keys and you are responsible for the backup. Neither option removes all risk, so match the choice to the amount and to how often you trade.
How to secure your cryptocurrency account
Your exchange account is a common target. These security practices take ten minutes to set up:
- Use strong passwords that are unique to the account, stored in a password manager.
- Turn on two-factor authentication with an authenticator app or a hardware security key. Avoid SMS codes, which can be stolen through a SIM swap. See our 2FA guide.
- Set a withdrawal whitelist, so crypto can only go to addresses you approved in advance.
- Turn on the anti-phishing code if your exchange offers one: a word that appears in every genuine email.
- Check your active sessions and devices regularly and log out of any you do not recognise.
How to protect your private keys
Your private keys are your crypto. If you use self-custody, these rules protect them:
- Write your seed phrase on paper or steel and keep copies in multiple secure locations, such as your home and a family member’s safe. Never photograph it or store it in the cloud, an email or on USB drives connected to your computer.
- Never type your seed phrase into a website or app. Only a hardware device you are setting up or restoring should ever ask for it.
- Buy hardware wallets from the maker or an official reseller, so nobody has tampered with the device.
- Consider multi sig wallets for large amounts. They need two or more keys to approve a transaction, so one stolen key is not enough.
- Plan for your family. Write down where your backups are and how to use them.
How secure are crypto exchanges?
Crypto exchanges hold huge amounts of cryptocurrency assets, which makes them prime targets. A hack can hit you even if your own security is perfect, because your coins sit alongside those of other users, and you rely on the security protocols of the exchange. Even large platforms get hacked: on 21 February 2025, about $1.5bn in ETH was stolen from Bybit, and the FBI attributed the theft to North Korea.
In the EU, MiCA raises the bar. Licensed exchanges must keep client crypto separate from their own assets, follow custody rules and, under the EU’s Digital Operational Resilience Act, meet standards for information security and IT resilience. That does not make hacks impossible, and crypto is not covered by any investor compensation or deposit guarantee scheme. Use a reputable exchange with a MiCA licence, check it in ESMA’s register, and avoid keeping all your holdings on one platform.
Use crypto safely: devices and habits
Good crypto cybersecurity is mostly ordinary digital security done consistently:
- Update your phone, computer, browser and wallet apps promptly.
- Download apps only from the official website or app store link, and check the publisher.
- Do not talk about your holdings in public or on social media. Visible wealth attracts threat actors, online and offline.
- Double-check addresses before every transfer, and send a small test amount first when the sum is large.
What to do if your crypto is stolen
If you have had crypto stolen, act within minutes, not days:
- Move any remaining funds to a new wallet created on a clean device.
- Change passwords and 2FA on your exchange and email accounts.
- Contact your exchange at once; it may be able to freeze funds that reach it.
- Report it to the police, with transaction hashes and addresses, and check whether the scam is on the AFM or BaFin warning list.
- Ignore recovery offers. People promising to get stolen crypto back for a fee are almost always scammers too.
Our guide to security best practices covers each step in more depth.
The bottom line
Whatever the cryptocurrency market does, protecting your cryptocurrency investments is in your hands. Crypto security comes down to layers: a licensed exchange, a strong account, keys kept offline and careful habits. No single step removes every risk, but together they make you a much harder target than the next person.
Related terms
Questions people ask
What is the best way to secure your crypto?
Combine a few layers: use a licensed exchange with app-based 2FA and a withdrawal whitelist, keep larger amounts on a hardware wallet, and store your seed phrase offline in a secure location. Most thefts beat only one layer.
Can someone steal my crypto if they have my wallet address?
No. A wallet address only lets people send you crypto and see the balance. To move your funds, someone needs your private keys or seed phrase, or access to your exchange account.
Where should I keep my crypto?
There is no place without risk. For long-term holdings, a hardware wallet that keeps your private keys offline removes exchange risk; for smaller amounts you trade often, a MiCA-licensed exchange with strong account security is more practical.
Which crypto has never been hacked?
Large blockchains such as Bitcoin are very hard to attack directly, but that is rarely where people lose money. Most crypto is stolen from people, apps and exchanges, through phishing, malware or weak account security.