The otversion HScript command and the equivalent python methods hou.NodeType.version and hou.NodeType.setVersion let you get and set the version number of a digital asset. The “version number” can actually be any text string. You can use a simple incrementing integer like “016” or more point number strings like “1.0.23”.
You must unlock and save changes to the asset to save the version number change.
You may want to maintain a version history in the documentation for the asset, listing the changes made to the asset in each version.