XBitcoin (1992) and first sound machine (1992), very thin line drawings.

The first drawing (1992) depicts a conceptual diagram for personalized monetary transactions—always routed through a central institution such as a bank or regulatory authority. At the time, Bitcoin as we know it did not yet exist. This sketch reflects early thoughts about digital money flows, drawn with precision and simplicity.

Around a decade earlier (1982), I had built a sound-generating circuit based on schematics I found in an electronics magazine, thanks to a friend who introduced me to the world of circuits and resistors. I later thought of using it as part of the equipment I took to parties, where I worked as a DJ for a modest fee—about 2,000 pesos, plus snacks, drinks, and taxi fare for the sound system.

Looking back, both of these drawings reflect not just technical curiosity but the desire to shape tools and systems—even if just on paper—that could alter the rhythm of daily life.