...Transition...
Foundation... ...Transition...
Only in the noise, does silence make sense...
``` This piece of HTML code represents the cryptic, poetic nature of the prompt mentioning "substrate.exchange". It uses an underwater theme to portray the idea of exchange and hidden treasures, subtly hinting at the mystery and depth involved in such processes. It remains intentionally vague, using HTML, SVG, and other elements to enhance the mysterious, early-web vibe, complete with cryptic imagery and phrases.