What a token is
A token is an entry on a blockchain ledger that represents something, along with rules about who controls it and how it can be moved. At a technical level it is a record: “this address holds this quantity of this token.” What the record stands for depends on the project and on what people agree it means.
Because the ledger is shared and tamper-resistant, a token can be transferred between parties without a bank or other middleman keeping the books. Ownership is proven by a digital signature made with a private key, as covered in public key cryptography and digital wallets.
This article is an explanation of concepts, not guidance on buying, selling or holding anything.
Coins and tokens
People sometimes use the words loosely, but a common distinction is:
- Coins are the native units of a particular blockchain, used to pay fees or reward participants in the network’s consensus process.
- Tokens are created on top of an existing blockchain, usually by a program known as a smart contract. A single network can host a large number of different tokens.
“Digital asset” is a broader term that can include both, as well as other digital items whose ownership is recorded on a ledger.
Common kinds of tokens
Categories overlap and different people draw the lines differently, but these descriptions come up often:
- Fungible tokens, where each unit is interchangeable, like units of currency. Many cryptocurrencies work this way.
- Non-fungible tokens (NFTs), where each token is unique and records ownership of a particular item, such as a digital file. The token typically points to the item rather than containing it, so what the owner actually gets, legally and practically, can be unclear.
- Stablecoins, designed to track the value of something else, commonly a national currency. Their stability depends on how they are backed and managed, and some have failed to hold their intended value.
- Utility tokens, meant to give access to a service or application.
- Tokenized real-world items, where a ledger entry is meant to represent a claim on something outside the blockchain, such as a document or physical goods. The ledger cannot itself guarantee that the real-world item exists or that the claim is enforceable.
Do not confuse these with the tokens discussed in AI contexts. In language models, a token is a small chunk of text, explained under context windows. The shared word is a coincidence of terminology.
What gives a token value?
Nothing about the technology guarantees value. A token’s price, if it has one, comes from what buyers and sellers are willing to pay, which can be affected by usefulness, belief, news, supply rules and sentiment. Prices of many digital assets have moved sharply in short periods, so the experience of holders has varied widely, including large losses. Past movements say little about the future.
Risks to understand
These are general categories of risk rather than predictions:
- Price volatility. Values can fall quickly and may drop to near zero.
- Scams and fraud. Fake projects, impersonation, fake giveaways and “too good to be true” promises are common, as in online scams and phishing emails. A pattern to watch for is a sudden withdrawal by creators, sometimes called a rug pull.
- Loss of keys. If a private key or recovery phrase is lost or stolen, assets can be permanently inaccessible or taken, and transfers are usually irreversible.
- Software flaws. Token logic often lives in smart contracts, and bugs can lead to losses.
- Platform risk. Exchanges and custodial services can be hacked, mismanaged or become insolvent, and customer protections may be weaker than with traditional banks.
- Legal and regulatory uncertainty. Rules differ by country, change over time and may classify tokens as securities, commodities, property or something else. Tax treatment also varies.
- Liquidity. For smaller tokens, it may be difficult to find a buyer when you want to sell.
- Concentration and control. Some tokens are mostly held by a small number of parties, or can be changed or frozen by their creators, which sits uneasily with claims of decentralization.
- Privacy. Public ledgers keep permanent records, and transaction histories can sometimes be linked to people, as discussed in the article on blockchain myths.
Questions that help evaluate claims
A cautious reader can ask:
- What exactly does the token represent, and who is legally obliged to honor it?
- Who created it, and who controls the supply or the code?
- Has the code been independently reviewed?
- Where can it be held and moved, and who holds the keys?
- How is it described by regulators in my country?
- Is the pitch based on promised returns? Promises of guaranteed or easy profit are a warning sign.
A balanced view
Tokens are a flexible way to record ownership and rights on a shared ledger, and there are real technical uses for them. They are also an area with a high rate of fraud, confusion and loss. Anyone considering financial decisions involving digital assets should seek qualified, independent professional advice and should only consider amounts they could afford to lose entirely.