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39c3 2025

39c3 2025

Dive into 7 insightful Mastodon posts from 39c3 2025 by Ryan Castellucci (they/them) on Day 2 featuring key discussions, trending topics, and highlights from the conference.

Add your voice to the conversation by posting with the #39c3 hashtag on Mastodon.

About 39c3 2025

The 39th Chaos Communication Congress (39C3) takes place in Hamburg on 27–30 Dec 2025, and is the 2025 edition of the annual four-day conference on technology, society and utopia organized by the Chaos Computer Club (CCC) and volunteers.

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Ryan Castellucci (they/them)

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Ryan Castellucci (they/them)

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@[email protected]

Today's shirt #39c3

A warm and friendly close-up selfie of a person with long, flowing light brown hair and a gentle, kind smile. They have bright eyes and soft freckles across their cheeks, looking directly into the camera with a welcoming expression.
The subject is wearing a purple t-shirt featuring a vibrant, retro-style graphic.

The design shows a colorful rainbow arching over soft white clouds, topped with a bright yellow star. Across the center of the rainbow, the words "Fuck Bitcoin" are written in a stylized, vintage-inspired blue and white font.

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Ryan Castellucci (they/them)

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@[email protected]

My Star Trek uniform was a bit too warm, so today I'll be wearing my purple "Fuck Bitcoin" tshirt. #39c3

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Ryan Castellucci (they/them)

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@[email protected]

Good night #39c3

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Ryan Castellucci (they/them)

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@[email protected]

Who do I know (if we're mutuals or should be it counts) who's at #39c3 who I haven't met up with yet? I know there are many of you. :-)

There's a trans* meetup at 10:30 that I'll be at.

https://events.ccc.de/congress/2025/hub/en/event/detail/trans-treff

[39c3] Trans* Treff

[39c3] Trans* Treff

Meetup for trans and non binary peoples. There is no agenda, just a chance to meetup other people and maybe Blahajs :3

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Ryan Castellucci (they/them)

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@[email protected]

I'm at the trans* meetup in a purple "fuck Bitcoin" tshirt, say hi if you're here! #39c3

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Ryan Castellucci (they/them)

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@[email protected]

Good night #39c3

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Ryan Castellucci (they/them)

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@[email protected]

Somewhere down there in the mist, #39c3 day 2 is about to start.

An elevated, wide-angle view of Hamburg at dawn, heavily shrouded in a thick, low-lying mist. The sky transitions from a deep, dusky purple at the top to a vibrant, glowing orange along the horizon where the sun is beginning to rise.

In the center of the frame, the tall, rectangular silhouette of the Radisson Blu Hotel rises above the fog, its upper windows catching the light. To the left, several lower buildings and a construction crane are partially visible through the haze.

Below the hotel, the CCH (Congress Center Hamburg) is obscured by the dense mist, though streetlights along a multi-lane road in the foreground cast a warm, yellow glow through the fog. Several small birds are captured in flight against the clear upper sky, adding a sense of movement to the still, cold morning.

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