Technologie & IA
NFTs: a unique identifier, practical uses and limitations
An NFT connects a distinct identifier to an address on a blockchain. Images, access, game items and credentials depend on the services and conditions associated with the token.
Ryan MitchellEditorial pen name
Identify the token and its metadata
An NFT is a non-fungible token with a distinct identifier in a contract. Units of a fungible token generally perform the same role, while separate NFTs can represent different items. This distinction enables individual tracking of a digital object or use. The identifier establishes a technical identity, rather than automatically explaining the value, usefulness or rights associated with the object being represented.
02How it works+
On Ethereum, the ERC-721 standard defines functions for tracking and transferring these tokens. The identifier must be read alongside the contract address and network. A number alone does not identify an NFT everywhere, and an imitation collection can reuse familiar images. Visual similarity is therefore different from technical identity. The contract and the relevant network provide information that an image or collection name cannot establish alone.
The token and its associated content are separate. Images, descriptions and characteristics can be recorded in metadata. This information can reside on the blockchain, in distributed storage or on a conventional server. Its location and the ability to modify it affect how reliably the content remains displayed. A record of ownership does not automatically guarantee permanent access to every file shown by an application.
03Key points to remember+
Uses and permissions
Uses extend beyond image collections. An NFT can act as a participation credential, badge, ticket, game item or support for a digital name. The relevant application must recognise the token and maintain the promised service. Holding a game item does not guarantee that it works in another game. The existence of a transferable identifier and the continued availability of a particular use are different conditions.
Control of the token does not automatically establish every permission concerning the represented content. Collection terms, licences and service commitments explain what is granted. A technical standard cannot replace that description. Programmed scarcity also does not automatically create demand or a resale opportunity. Network fees, key custody, transfer permissions and phishing remain relevant parts of the user's interaction with the token.
Imagine an event ticket represented by an NFT. The contract tracks who controls the token, while a service decides whether it admits the holder. The image displayed in a wallet may be stored elsewhere. Token identity, access to the file and recognition by the organiser are consequently separate questions. A visible illustration does not establish that the associated service remains available under the same conditions.
Separate the record from the service
This distinction matters when a collection changes its website or metadata. Depending on the design, information may evolve, move or depend on external hosting. The register can retain transfer history without guaranteeing continued access to every displayed element. A description needs to explain what is on the blockchain and what comes from additional systems. The word decentralised does not answer all of those questions uniformly.
Owning a token does not automatically transfer intellectual property in its image. Permitted uses depend on the content and service conditions. Transferring the NFT and changing those conditions are not necessarily the same event. A complete reading therefore brings together technical identity, storage, described rights and service operation. That account explains more than the sale price or advertised rarity of the object alone.