# emin.de

> emin.de publishes long-form written work by Emin Mahrt on Bitcoin self-custody, payment rails, AI agents and the engineering behind them. Every post is plain Markdown in a public GitHub repository and is served as HTML, Markdown, JSON, feeds and through a public MCP server.

Long-form engineering writing, built to be read by people and agents. Written by Emin Mahrt.

## Latest posts

- [Fazua Ride 50 speed unlock from a Mac, no box](https://emin.de/posts/fazua-ride-50-speed-unlock-mac) (2026-10-16, guide, Emin Mahrt.) How my agent and I raised the speed limit of a Fazua Ride 50 Evation from 25 to 55 km/h over USB from a MacBook, with firmware 2.04 and an open source tool. Markdown: [index.md](https://emin.de/posts/fazua-ride-50-speed-unlock-mac/index.md)
- [A tree does not burn alone](https://emin.de/posts/photo-pine-forest-portrait-evening-sun) (2026-10-16, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A pine forest portrait read closely. Real Olympus E-M5 II EXIF, a likely Voigtländer 25mm f/0.95, low sun, 1/8000 s mechanical shutter, measured tones, and one fix with annotated crops. Markdown: [index.md](https://emin.de/posts/photo-pine-forest-portrait-evening-sun/index.md)
- [Badass Box 4 on a Fazua Ride 50, the yellow light](https://emin.de/posts/badass-box-4-fazua-ride-50-yellow-light) (2026-10-14, guide, Emin Mahrt.) My Badass Box 4 on a Fazua Ride 50 kept blinking yellow. What the light means, where the magnet goes, what the black ring is for, and what Badass said. Markdown: [index.md](https://emin.de/posts/badass-box-4-fazua-ride-50-yellow-light/index.md)
- [It is not taboo to go back and fetch what you forgot](https://emin.de/posts/photo-garden-path-portrait-look-back-golden-light) (2026-10-14, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A garden path portrait read closely. Real Olympus E-M5 II EXIF, a likely Voigtländer 25mm f/0.95, low warm sun, shallow focus, measured shadows and one fix, with annotated crops. Markdown: [index.md](https://emin.de/posts/photo-garden-path-portrait-look-back-golden-light/index.md)
- [One man cannot launch a vessel](https://emin.de/posts/photo-wooden-boat-shallow-surf-black-and-white) (2026-10-14, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A close reading of a black-and-white dawn photo of a crowded wooden boat in shallow surf, with its real settings, four dust spots and a Swahili proverb. Markdown: [index.md](https://emin.de/posts/photo-wooden-boat-shallow-surf-black-and-white/index.md)
- [Can sound do what quantum particles do?](https://emin.de/posts/can-sound-do-what-quantum-particles-do) (2026-10-13, explainer, Emin Mahrt.) Sound bends, spreads and interferes like electrons in the double slit. So is sound quantum? Where the comparison works and where it breaks. Markdown: [index.md](https://emin.de/posts/can-sound-do-what-quantum-particles-do/index.md)
- [Mountains never meet, but people do](https://emin.de/posts/photo-environmental-portrait-mountain-field-golden-hour) (2026-10-13, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A centred portrait under a hazy mountain, read closely. Low sun, open shade, aerial perspective, the real Olympus EXIF at 1/8000 s, and a 20 minute exercise. Markdown: [index.md](https://emin.de/posts/photo-environmental-portrait-mountain-field-golden-hour/index.md)
- [The sun cannot be covered with mud](https://emin.de/posts/photo-harbour-cranes-sunset-lens-flare) (2026-10-13, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A close reading of a harbour photo shot straight into a low sun: the flare, the haze, the two skies, an exposure read from guy wires, Monet, the Bechers, Sandburg's fog and one fix. Markdown: [index.md](https://emin.de/posts/photo-harbour-cranes-sunset-lens-flare/index.md)
- [A thousand friends are few, one enemy is too many](https://emin.de/posts/photo-istanbul-ferry-seawall-black-and-white) (2026-10-13, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A close reading of a black-and-white Istanbul photo. Two head sizes, a ferry's name and its smoke give away distance, aperture and shutter, with Ara Güler and Orhan Veli alongside. Markdown: [index.md](https://emin.de/posts/photo-istanbul-ferry-seawall-black-and-white/index.md)
- [The eyes say as much as the mouth](https://emin.de/posts/photo-leather-jacket-portrait-over-shoulder) (2026-10-13, photo, emin.de AI Desk. AI-written, human-supervised: not yet reviewed.) A close reading of an over-the-shoulder portrait in soft daylight. The turn, the catchlights, lens distance, shutter and aperture trade-offs, and one fix, with annotated crops. Markdown: [index.md](https://emin.de/posts/photo-leather-jacket-portrait-over-shoulder/index.md)

## For agents

- [llms.txt](https://emin.de/llms.txt): the site map for language models.
- [RSS](https://emin.de/rss.xml), [Atom](https://emin.de/atom.xml), [JSON Feed](https://emin.de/feed.json).
- [JSON API](https://emin.de/api/articles): every post, no credentials.
- [Developer docs](https://emin.de/developers): API, MCP and examples.