Notices and Warnings

Results for some tokens display additional notices and warnings. In this page we provide more information on the details of these notices and what they mean.

Notices

Standard token metadata is served from an off-chain location

NFTs have a standardised way of returning per token metadata. In ERC-721 tokens this interface is tokenURI, whereas in ERC-1155 it isuri. Standard token metadata is a generalised term we used to refer to the metadata returned by these standard interfaces.

In some cases, standard token metadata returns off-chain URL, whereas a supplemental method has been provided for retriving corresponding data from on-chain. In some case this design choice has been for historical reasons: in early days of NFTs, marketplaces did not support on-chain metadata, so having a regular URL was only way for collections to be compatible.

This notice is displayed to indicate that it is not possible to guarantee that standard token metadata returns identical information to on-chain data. This could be either due to alterations to off-chain metadata or due to off-chain metadata becoming inaccessible. In either case, on-chain metadata would still remain accessible.

Standard token metadata is missing

As providing metadata is optional to NFTs, some NFTs have decided to opt-in. If no metadata at all is accessible, NFTs are not considered to be on-chain. However in same cases, NFTs provide supplemental method for accessing equivalent metadata information.

This notice is displayed to indicate that while metadata can be resolved from the chain, the standard token metadata is missing.

Image resolves to an off-chain location

Image information for this token refers to a resource that is stored in an off-chain location, such as a centralized server or a content delivery network. In NFT standards, image attribute is the canonical way to attach art to NFTs. Even in NFTs that contain multimedia or runnable art (HTML), image is often used as a thumbnail or static representation.

This notice is displayed to indicate that any thumbnails seen in marketplaces or applications is based on off-chain, if it originates from image attribute.

No image can be resolved

Sometimes NFTs that contain multimedia or runnable art (HTML), do not have have any image or equivalent defined. Most marketplaces and applications require image as a thumbnail to represent the NFT especially on browsing views where multiple NFTs are displayed at once.

This notice serves indicates that the token does not contain any reference to an image, neither on-chain or off-chain. As such, any thumbnails seen, are likely based on data that has been either uploaded off-chain to the marketplaces, or otherwise generated using off-chain tooling.