A token in blockchain is a digital representation created and managed according to the rules of a blockchain network or smart contract, typically representing value, an asset, a right, an entitlement, an identity-related attribute or another programmable unit. The word token has a broad meaning, so it should not be assumed to mean cryptocurrency in every context. A token can be fungible, meaning units are interchangeable, or non-fungible, meaning individual units are distinguishable.
Tokens can also represent access rights, governance rights, claims on assets, voting power, game objects, collectibles or other application-specific functions. The blockchain records token-related state and transactions, while the relevant protocol or smart contract defines how tokens are created, transferred, destroyed and used. A token therefore combines a digital representation with a set of technical rules that determine how that representation behaves.
There is an important distinction between a blockchain's native asset and a token created on top of that blockchain. Bitcoin's BTC and Ethereum's ETH are native assets of their respective networks and play roles in network operation, including transaction payment and, depending on the system, economic incentives for participants. By contrast, an ERC-20 token on Ethereum is created through a smart contract running on the Ethereum network rather than being a native asset of Ethereum itself.
The distinction can affect transaction fees, security dependencies and technical implementation. A token issued through a smart contract generally relies on the underlying blockchain to record and validate its state, while the native asset is part of the blockchain's own protocol architecture. Some blockchains use the word coin for native assets and token for assets issued through additional protocols, although terminology is not perfectly consistent across the industry.
Fungible tokens are designed so that individual units of the same token type are normally interchangeable. ERC-20 is a widely recognised Ethereum standard for fungible tokens, defining common functions such as transferring balances, approving spending allowances and querying balances. Stablecoins are one important category of fungible token and are generally designed to maintain a value relationship with a reference asset such as a fiat currency, although their mechanisms and risks differ.
Governance tokens can give holders specified voting rights in a protocol. Utility tokens can provide access to features or services. Wrapped tokens can represent an asset or claim associated with another blockchain or system, although the exact mechanism depends on the implementation. These categories describe intended functions rather than guaranteeing that the token will retain a particular value or utility.
Non-fungible tokens differ because individual token identifiers are distinguishable. NFT standards such as ERC-721 and broader multi-token standards such as ERC-1155 allow smart contracts to manage individually identified assets or mixtures of token types. A token can also have semi-fungible characteristics, where multiple units share certain properties but become individually distinguishable under particular conditions.
The distinction between fungible and non-fungible concerns how the token is represented and treated within the relevant system, not whether the underlying real-world object is physically unique. A token representing a unique ticket seat may be non-fungible, while a token representing 100 units of a commodity claim may be fungible. The blockchain architecture determines how these distinctions are technically encoded and enforced.
Tokens are created through processes commonly called minting or issuance. A smart contract can define a maximum supply, rules for creating additional units, allocation mechanisms, transfer restrictions and other behaviours. Token burning can reduce the supply by removing tokens from active circulation according to the contract's rules. Some tokens have a fixed maximum supply, while others have inflationary or dynamically controlled issuance. The actual supply can depend on contract logic and administrative privileges.
A contract owner or privileged account may be able to mint, freeze, blacklist, pause or otherwise modify token behaviour in some implementations. Consequently, simply reading a token's name or ticker symbol does not reveal its actual properties; users need to examine the underlying contract, permissions and implementation.
Tokens can serve as interfaces between blockchain systems and applications. A decentralised finance protocol may use tokens to represent deposits, debt positions, liquidity shares or governance rights. A game can use tokens to represent characters, equipment or currencies. A membership system can issue tokens that applications recognise as access credentials. A tokenised real-world asset system can attempt to represent claims associated with property, securities, commodities or other assets.
Such representations introduce an important dependency: the blockchain can enforce who controls the token, but it cannot automatically enforce facts about the external world. An oracle, custodian, legal agreement or other trusted mechanism may be required when a token represents something that exists outside the blockchain.
Tokens have several risks and limitations. Smart-contract errors can create vulnerabilities or cause tokens to behave unexpectedly. Centralised administrative permissions can give an issuer substantial control despite the token being blockchain-based. Liquidity may be limited, making a token difficult to trade. Token balances can be stolen when private keys or approvals are compromised. A token can also be technically valid while being economically worthless or legally unrelated to the claim that a user assumes it represents.
Blockchain transactions are often difficult to reverse, and interacting with malicious contracts can result in permanent losses. Regulatory classification can vary according to the token's characteristics and jurisdiction. A token should therefore be evaluated by its contract code, issuance model, rights, governance, dependencies and actual use rather than by its marketing description alone.
The essential idea is that a blockchain token is a programmable digital representation whose rules are maintained by a blockchain protocol, smart contract or related token system. Tokens can be fungible or non-fungible and can represent many different forms of value, access or rights. Their behaviour is determined by technical standards and contract logic, while their legal and economic meaning depends on the surrounding application and arrangements. The term token is therefore broader than cryptocurrency: cryptocurrency is one category of blockchain-based value, whereas tokens can perform many additional functions.
