CASP z siedzibą w Danii4,8/5Guide · Crypto basics · Updated 19 August 2026 · 4 min read
What is cryptocurrency?
Cryptocurrency is a class of digital assets that live on a blockchain — a shared, decentralised ledger that no single bank or government controls. This guide explains the basics: what crypto is, how it works, what it’s used for, and how to get started safely. It is educational, not investment advice.
The short version
- Crypto is a digital asset on a blockchain — ownership is controlled with cryptographic keys, not a bank account.
- Different assets do different jobs: store of value, smart contracts, price-stable stablecoins.
- Crypto is volatile and covered by no deposit guarantee — invest only what you can afford to lose.
- Start on a regulated platform you can verify yourself, and keep records of your trades from day one.
What is cryptocurrency?
A cryptocurrency is a digital asset recorded and transferred on a blockchain. Unlike kroner or euro, it is not issued by a central bank and is not legal tender. Ownership is tied to cryptographic keys, not to an account at a bank.
Bitcoin was the first cryptocurrency (2009). Today there are thousands — from large assets like Bitcoin and Ethereum to stablecoins that track a currency such as the dollar or euro.
How does it work? (blockchain in brief)
A blockchain is a shared ledger maintained by many computers across a network. When a transaction is made, it is verified by the network and added to a "block" that is chained to the previous ones — hence "blockchain".
Because the ledger is distributed and hard to alter retroactively, parties can transfer value directly without a central intermediary. That is the core idea behind crypto.
What is crypto used for?
Different crypto assets do different jobs. The three most common roles:
- Store of value — Assets like Bitcoin are used by many as a long-term, scarce digital store of value.
- Programmable platforms — Networks like Ethereum run "smart contracts" — programmable agreements that apps and tokens build on.
- Stablecoins — Price-stable units pegged to, say, the dollar or euro — used for trading, settlement and moving value quickly.
Cryptocurrency vs. ordinary money
The quickest way to understand cryptocurrency is to compare it with the money you already know:
| Kroner (fiat) | Cryptocurrency | |
|---|---|---|
| Issuer | Danmarks Nationalbank | No central issuer — governed by code |
| Legal tender | Yes | No — no one is obliged to accept it |
| Storage | Bank account with deposit guarantee | Wallet or platform — no deposit guarantee |
| Supply | Managed by monetary policy | Fixed in the protocol (e.g. Bitcoin’s 21 million) |
| Price swings | Low — the krone is pegged to the euro | Can be very large |
Is cryptocurrency legal in Denmark — and what about tax?
Yes. Buying, holding and selling cryptocurrency is legal in Denmark, and the area is regulated through the EU’s MiCA regulation — providers must be authorised as a CASP and supervised (in Denmark by Finanstilsynet).
Gains on sales are generally taxable as personal income, and the rules for losses differ from those for gains. Keep records of your trades from the first purchase, and see the Danish Tax Agency’s (skat.dk) guidance for your own filing.
How to get started safely
- Choose a regulated platform — Use a supervised CASP you can verify yourself in Finanstilsynet’s or ESMA’s register.
- Start small — The price can swing sharply. Begin with an amount you can afford to lose, and learn the market first.
- Keep records from day one — Gains are taxable in Denmark, and good documentation makes filing easy.
- Protect your access — A unique password and two-factor authentication — and if you move to your own wallet, guard your keys carefully.
Crypto carries a risk of loss, and no return is guaranteed. Treat it as a risky asset.
Frequently asked questions
This guide is educational and not investment advice. Crypto assets are volatile and carry a risk of losing your entire investment. Invest only what you can afford to lose.
Ready for a first, careful step?
Open a free account on a regulated Danish platform. Buy from 190+ assets with one flat 2% fee — delivered to your own wallet.