Metadata

Key points

• Metadata is data that describes other data, providing information about its characteristics and context.
• In a transaction, metadata can include details such as timing, participants, and other associated properties.
• In tokens and digital items, metadata describes what the asset represents, such as name, image, and attributes.

What is metadata?

Metadata is information about information. Rather than being the content itself, it describes that content: its characteristics, its origin, its format, or its context. A common example outside the crypto world is a digital photo, which carries, in addition to the image, data about when and with which device it was taken. This additional data, which speaks about the photo, is metadata.

How it works

The core idea is layered description. There is the main data, which is the content of interest, and there is metadata, which says something about it. This separation is useful because it allows information to be organized, searched, and interpreted without having to examine the entire content. Knowing the metadata of an item makes it possible to quickly understand what it is and how it relates to others.

In the context of blockchains, metadata appears at various points. A transaction, for example, in addition to moving value, carries information that describes it, such as when it occurred and details of its properties. This data helps interpret and verify what happened, and analytics tools rely on it to organize and present the network's history in an understandable way.

Metadata is especially important for tokens and unique digital items. A digital collectible, for example, usually has metadata that defines its name, its image, and its attributes, that is, what it effectively represents. Often, this metadata and the associated files are not stored on the blockchain itself, for cost reasons, but in external storage systems, with the blockchain keeping only a reference to them. This makes the integrity and permanence of metadata a relevant point.

Understanding metadata helps in understanding how assets and transactions are described and where these descriptions actually reside.

Why it matters

Understanding metadata helps in understanding how transactions, tokens, and digital items are described and why the integrity of these descriptions matters, especially when they are stored off-chain. For a company dealing with these assets, this is useful technical context. It is a technical concept, and none of this represents any operational recommendation.

Risks and limitations

When an item's metadata is stored off-chain, its permanence and integrity depend on where it is kept, and it can be lost or altered if that storage fails. Metadata can also be incomplete or incorrect. Because of this, it is important to know where it resides and how reliable that source is. None of this represents an operational recommendation.