Marmalade NG Metadata

The URI of a token (as retrieved by get-uri) must point to a JSON off-chain Metadata Object.

Ideally the Object is stored on ipfs. (ipfs://CID).

A token metadata has the following format:

JSON Metadata

Field Name	Data Type	Description
name	string	Identifies the asset to which this NFT represents.
description	string	Describes the asset to which this NFT represents.
image	string	A URI pointing to a resource with mime type image/* representing the asset to which this NFT represents. Consider making any images at a width between 320 and 1080 pixels and aspect ratio between 1.91:1 and 4:5 inclusive.
attributes	array of objects	An array of objects, each representing a characteristic or trait of the NFT, with a trait_type field specifying the trait’s name and a value field specifying the trait’s value.
properties (Optionnal, see below)	object	Arbitrary properties. Values may be strings, numbers, object or arrays.

JSON Metadata (properties object)

Field Name	Data Type	Description
authors	array of objects	An array of authors who created or contributed to the asset. Each author is an object with a name field specifying the author’s name.
external_url	string	URL to an external application or website where users can also view the asset.
animation_url	string	URL to a multimedia attachment of the asset. The supported file formats are MP4 and MOV for video, MP3, FLAC and WAV for audio, GLB for AR/3D assets, and HTML for HTML pages. You may use the ?ext={file_extension} query to provide information on the file type.
collection	object	An object with a name field specifying the name of the collection, and a family field specifying the larger category or group to which the collection belongs.