Transient Labs structures metadata in accordance with major marketplaces, plus a few extra fields
TL Metadata is supported by all major marketplaces, such as SuperRare, OpenSea, LooksRare, and Nifty Gateway. The metadata follows widely accepted standards, with a few additional fields.
The description that goes along with the NFT. You can use Markdown on OpenSea and SuperRare, although markdown links are not supported on SuperRare (regular links are).
A note on line breaks in Markdown: You need two spaces in front of the escape characters. For example: \n
external_url
A url string that would show up under the item on OpenSea and can be used to direct people to your website or other content you want them to see.
attributes
A list of key-value pair objects. The trait_type is always the key and value is the value. You can read more about these here. Note, boosts or anything like that are not supported outside of OpenSea.
tags
These are essentially hashtags on SuperRare. OpenSea does not yet support although they may be looking into this based on some beta features available in collection settings. We shall see.
image
The uri of the image. Supported file types are jpeg, png, and gif.
image_sha256
The sha256 hash of the image. Useful for assuring that the downloaded file is correct.
animation_url
The uri of the animation. Supported file types are mp4, mp3, glb, gltf, html
animation_sha256
The sha256 hash of the animation. Useful for assuring that the downloaded file is correct.
media
An object containing some details about the main asset for quicker indexing. Primarily used by SuperRare.
uri - the link to the main asset (either image or animation_url)
size - the size of the main asset in bytes shown as a string
dimensions - the dimensions of the main asset if available, otherwise the dimensions of the thumbnail image ex: 100x100
