To partly answer my own question:
As mentioned in this git issue you can use
console.log(wp.blocks.getBlockTypes());
in the browser console after all the Gutenberg magic loaded (e.g. in the editor window of a post) to show all currently registered blocks, inluding their attributes.
Another Info-Source:
The Git-Project of Gutenberg holds all core blocks and their properties can be accessed by
Name-of-Block*/index.js
Then find: const blockAttributes =
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