Decentralized Systems & Applications

Dear friends, Join us for a gentle hike if you enjoy both walking in the forest and meditating. We’ll take a 2-hour walk in Grunewald and have a meditation practice along the way. The practice is suitable for everyone, regardless of meditation experience. It’s a beautiful way to connect with nature, calm the mind, experience serenity, and have a good time with others. 📍**Meeting point:** [https://maps.app.goo.gl/gkvVTaZisA73RsRn7?g_st=ic](https://maps.app.goo.gl/gkvVTaZisA73RsRn7?g_st=ic) Please use this exact location - it’s a parking area next to Teufelsseestraße 21, 14055 Berlin. **🗓 When: Monday, 6 April** **10:00 - 13:00** Please arrive before 10:00. We will wait a maximum of 10 minutes for latecomers. The hike will take approximately 2 hours, and the meditation practice will last about 30 minutes. We will return to the starting point by 13:00. **🎟️Participation is donation based:** Feel free to donate any amount you like. **What to bring:** \- Wear comfortable shoes and clothes; please check the weather beforehand \- A water bottle \(water or tea\, as you prefer\) \- If you’d like\, bring something to sit on \(a small pillow\, cloth\, or anything comfortable for sitting in nature\) We love nature and meditation - and maybe you will too! Oneness Berlin Jazgul, Florian & Carla

**For English see below** **Treffpunkt:** w3.hub, Möckernstrasse 120, 10963 Berlin 2\. OG\, hinterer Bereich **Unsere Eventreihe hat die Themen:** Die folgenden Workshops sind immer kostenlos und auf die gesamte Eventreihe verteilt. Wir werden es dir auch ermöglichen, dass du zu jedem Zeitpunkt in die Eventreihe einfach einsteigen kannst. Die Eventreihe endet mit dem letzten Termin, aber sie wird danach sofort von vorn beginnen und wir werden das Datum der Events dann anpassen. * 12.01.: Was ist Bitcoin eigentlich? * 26.01.: Workshop: Bitcoin senden und empfangen * 09.02.: Workshop: Bitcoin/ Bitcoin Passwort (Seed) sicher aufbewahren * 23.02.: Wo man Bitcoin kaufen könnte und auf was man achten sollte * 09.03.: Workshop: Bitcoin in Sekunden versenden (Lightning) * 23.03.: Bitcoin vererben * 06.04.: Warum nur Bitcoin - nicht Crypto * 20.04.: Workshop: Bitcoin spielerisch verstehen **Kontakt zu BBW:** * Telegram: https://t.me/+8nEA93930qowODky * Nostr: Bitcoin Beginner Workshops / npub1qtc6zmhaq6svkuny3r5h3n6wxel5cyzmwz7haygans36ee60l7vqgk2sxp **Anmeldungen:** Diese sind nicht erforderlich. Sollte es zu voll werden, werden wir aber Personen mit einer Anmeldungsbestätigung Vorrang geben. Teilt uns in eurer Anmeldung lediglich die Anzahl der Personen mit - keine weiteren Infos erforderlich: * meetup.com * Email: bbw@bitcoinexplained.de * Telegram: https://t.me/+8nEA93930qowODky * oder mündliche Absprache mit den Organisatoren für Folgeevents **Video** Dieses Event wird nicht aufgezeichnet und auch nicht irgendwo danach online verfügbar sein. **English** This event here is in German. The event "[ENG] Bitcoin Beginner Workshops - Explore Bitcoin" is in English and can be found under this link: https://www.meetup.com/bitcoin-lab-berlin **Privatsphäre** Die Teilnahme bei diesem Event verpflichtet dazu, dass die Privatsphäre von allen Personen gewahrt wird. Es dürfen keine Aufnahmen jeglicher Art gemacht oder verbreitet werden, wenn Personen dabei erkenntlich sind. Das bezieht sich auf das Event ansich, die Zeit davor und danach.

The hike starts in Storkow, where we have short glimpse into its castle and cross a draw bridge over the Storkow canal. Before climbing one of Brandenburg's biggest inland dune, we get a view of Lake Storkow. After crossing forests and the village of Kolipin with its lake, we arrive at Bad Saarow, a spa town renowned for its hot springs and mineral-rich mud. From there, we take two trains back to Berlin in the late afternoon. Meet us in the **first car of the train RE7**, departing from **Ostkreuz station at 11:02** **am on platform 1,** (transfer in Königs Wusterhausen to RB36) **arriving at Storkow (Mark) at 11:57 am** Unless you subscribed to the Deutschlandticket, you'll need to buy a ticket to Storkow (Mark) and from Bad Saarow back to Berlin. Please note: * As a grown-up, you are responsible for yourself. * Come prepared for cold and windy weather. * Wear appropriate footwear, we may come across some sandy and muddy sections. * Forecasts predict low chance of rain, but you never know... * Bring enough water, food and some cash with you. * Please be fair and only RSVP if you are sure you can make it and update if your plans change. See you on Easter Monday!

Andere drücken die Schulbank, wir aber wollen in gemütlicher (und realer) Atmosphäre wieder aufeinandertreffen und einen Deutsch-Spanisch-Tandemkurs aufleben lassen. Beim einfachen Zusammenkommen und kennenlernen lässt es sich schließlich viel effektiver lernen. und Spaß haben. ...

We play half court 4x4 amateur basketball. All levels are welcome but you should be able to play and know the basic rules. Don't be alarmed by the low attendee number, this group is mostly managed through WhatsApp today, we'll add you when you come play.

=== THE TOUR === On Easter Monday, we will drive to Stechlinsee for a swim and a picknick on the lake. We will depart at 10:00 (sharp) and drive to a parking space near the lake. From there it is a 10 minute walk. Return time of 17:00 is an estimate. The fishery will be open. The pizza shop on the maybe. === WHAT TO BRING === • Swimming wear, towls, etc. • Water, drinks and food • Good mood • 5 Euros for fuel and parking fees === NO-SHOW POLICY === I enforce a zero-tolerance policy on no-shows and last-minute cancellations. If you RSVP and don't show up, you will be removed from the group. If your plans change, please cancel early enough to make your seat available for someone else.

Du möchtest gemeinsam mit anderen Menschen in einer inspirierenden Umgebung meditieren und deinen Geist zur Ruhe bringen? An diesen Abenden kannst du die Meditation kennenlernen und vertiefen. Dieses Event findet sowohl online als auch vor Ort im Dharma Mati Berlin (Soorstr. 85, 14050 Berlin) statt. Um an diesem Online-Event teilzunehmen bitte auf den folgenden Link klicken: https://zoom.us/j/936473546 (Meeting-ID: 936-473-546).

Welcome to the mystical world of Tarot. The Tarot has been used since the 16th century as a tool for divination & inner reflection. Yet very few understand the mechanism behind how it works, and how to apply it toward uncovering hidden aspects of the psyche. Through a mix of intellectual discussion and practical exercises, we will dive into the connection between Tarot, Jungian psychology, and our inner worlds- leaving participants with a greater understanding of how to use Tarot as a tool for inner reflection and guidance in their personal lives. Door open at 6:30, event starts at 7pm. We will have light refreshments, wine, beer, and non-alcoholic beverages available for purchase. Tickets are donation based and recommended for 10 € via pre-registration ([link here](https://rausgegangen.de/en/events/mystery-salon-at-lilium-tarot-jung-the-shadow-0/)) or 15 € at the door. We recommend bringing a notebook or journal, and optionally, a deck you'd like to practice with. Whether you are a novice or expert- all levels are welcome- perhaps we can learn something from you? This salon is part of a special event series taking place in the beautiful and intimate setting of Lilium (Pfuelstrasse 5). Every Wednesday in April we gather for intellectual discussion around a range of topics at the intersection of spirituality, science, and self-improvement. The full program: April 1- [Full Moon Women's Circle](https://rausgegangen.de/en/events/pink-full-moon-womens-circle-at-lilium-0/) April 8- [Tarot, Jung & the Shadow](https://rausgegangen.de/en/events/mystery-salon-at-lilium-tarot-jung-the-shadow-0/) April 15- Dreamwork: Uncovering the hidden meanings of dreams April 22- Earth, Elements & Sacred Nature April 28th (Tuesday)- Special Edition Ecstatic Dance Event We can't wait to welcome you there! For questions please reach out to the organizer cheryl@risingtide.store

Hello Berliners, Join us for an insightful discussion and networking as we delve into the world of Bitcoin, Bitcoin mining and the broader trends shaping the Bitcoin ecosystem (including L2 developments) and **hyperbitcoinization**. Event will be on the second **Thursday** of the month! **Event Format:** Our event will adhere to the **Chatham House Rules**, ensuring confidentiality and encouraging open discussion. This format will enable you to engage with our expert speakers, ask questions, and network after the panel while respecting the confidentiality of discussions. Whether you're a seasoned Bitcoiner or a curious newcomer, this event offers a unique opportunity to expand your knowledge and connect with like-minded individuals. **Networking & Refreshments:** Enjoy networking opportunities with fellow attendees while sipping on refreshing drinks and indulging in small snacks. Share your thoughts, exchange ideas, and forge connections in a relaxed and inviting atmosphere. Reserve your spot now. We look forward to seeing you there! Denis, Arnab and Irina

We are back in the c-base! Do you already run NixOS and want to talk to other people or want an introductory session with some NixOS users. Just bring your machine! Usually there are no topics, we just sit in front of our computers, talk about stuff, debug some problems or review some PRs on nixpkgs. There are drinks usually available from the c-base bar. If you can't find us. just ask around or ask in irc (#krebs on hackint)

An inspiring, high-energy meeting of public speaking, connection, and personal growth in the heart of Berlin. **Mercury Toastmasters Berlin** invites you to our weekly meeting at our new home at **Das Center, Potsdamer Platz**, in the stunning **Historic Imperial Breakfast Hall**. *Experience the **power of prepared speeches** loaded with bold ideas, participate in our **dynamic Impromptu Session**, and **gain valuable insights** during our feedback segment.* *Leave with practical tools, fresh ideas, and renewed inspiration.* *Whether you want to speak up at work, boost your presence, or just meet inspiring people, you’ll feel at home at Mercury Toastmasters Berlin.* *** **[What to Expect:](https://mercurytoastmasters.de/find-toastmasters-meetings-in-berlin/)** ✨ A supportive space to speak, grow, and connect 🎤 Engaging prepared speeches ⚡ Fun, fast-paced impromptu speaking challenges 💬 Feedback session you can actually use 🌍 A friendly, international crowd (around 25–30 people) **Schedule** (times may vary) ⏰ 19:15 - Doors open & networking 🎙️ 19:30 - Prepared Speeches 🏓 20:35 - Impromptu Session (Guest welcome to join) ↩️ 21:00 - Constructive feedback 💬 21:30 - Food, drinks & relaxed socializing **No experience needed.** ***Come curious. Leave energized.*** *** **🤙 [Hear it from our members:](https://maps.app.goo.gl/eRtvR9DRNqU9WZQn7)** *“You can sharpen your public speaking skills and gain tons of confidence, while having fun and making new friends. Mercury is well-structured, fun, and affordable.”* — *Therese Pitt* *“Mercury gave me a safe place to speak, create, and grow. I love the multicultural vibe and supportive community. It’s the best place to learn and have fun.”* — *Krisztina Linka* *** **[Did You Know?](https://mercurytoastmasters.de/about-mercury-toastmasters-berlin/)** Toastmasters is where people go to get better at speaking—and grow into confident communicators and leaders. Today [Toastmasters ](https://mercurytoastmasters.de/about-mercury-toastmasters-berlin/)has 350,000+ members across 16,000 clubs in 143 countries. And [Mercury](https://mercurytoastmasters.de/find-toastmasters-meetings-in-berlin/) is one of the best places to experience it. So bring your curiosity, your energy—and just be yourself. Whether you’re just starting or ready to level up, there’s a place for you here. *** **[Wondering what you get as a member?](https://mercurytoastmasters.de/membership-mercury-toastmasters-berlin/)** Think expert feedback, real-world speaking practice, and a supportive crew that’s got your back. [See you Wednesday night! 🎉](https://mercurytoastmasters.de/find-toastmasters-meetings-in-berlin/)

**BitDevs Bitcoin Socratic Seminar Berlin @ c-base Raumstation** Join us for our monthly interactive **[Bitcoin Socratic Seminar](https://bitdevs.berlin)** in Berlin! We’ll start with pizza and beer (sponsored by [Ordimint.com](https://ordimint.com)), followed by deep-dive discussions on the most interesting *technical* developments in Bitcoin from the past month. Participation by everyone is highly encouraged! Our goal is to foster lively discussion, knowledge sharing, and debate. In the weeks leading up to the event, participants gather topics such as: * New research papers * New BIPs and BOLTs * Network statistics * Technical blog posts * Mailing list and Delving Bitcoin threads * Pull requests and updates from key repos (Bitcoin Core, LND, Core Lightning, Eclair, BDK, rust-bitcoin, LDK, Electrum, …) Each topic is briefly introduced by our moderators and then discussed before moving on. The full list of links will be published at [bitdevs.berlin](https://bitdevs.berlin) 1–2 days before the event — please review them in advance to get the most out of the discussion. **Important details:** * This event is highly technical — best suited for those with a solid grasp of Bitcoin internals. Curious newcomers are always very welcome, but expect in-depth conversations (see the former topics at [bitdevs.berlin](https://bitdevs.berlin)). * Chatham House Rule applies: you may share what was discussed, but not who said it. No livestream, no photos, no recordings. * The evening begins with food and networking; people often stay after the seminar to keep talking. **Co-hosted by:** * [Felix](https://x.com/FelixWeis) * [Freerk](https://x.com/freerko) * [Fabian](https://x.com/fjahr) For background on the idea of BitDevs Socratic Seminars, see [this article](https://bitcoinmagazine.com/articles/op-ed-want-to-learn-about-bitcoin-try-a-local-socratic-seminar).

Back in August, we explored how Design Thinking can help us uncover and validate the right problems. But even when we agree on what to build, things often go wrong, not because of bad solutions, but because we don’t fully understand what the problem actually means in practice. In this session, we’ll build on that idea and focus on the next step: turning vague ideas into something concrete, shared, and testable. Using Example Mapping - a lightweight technique from Behaviour-Driven Development (BDD) - we’ll work in small groups to: * Break down a feature into rules, examples, and questions * Surface hidden assumptions and edge cases * Align on what the behaviour of a system should actually look like If the previous session was about finding the right problem, this one is about understanding it well enough to build it right. This is a hands-on workshop. Be prepared to participate fully and add to the energy of the room. Looking forward to seeing you there!

🚀 Workshops: The Human-Digital Synthesis **Kultur\-Technik 2026 \| Women in Big Data Berlin** AI is no longer a future concept—it is already reshaping how we work, create, and make decisions. The real question is: **how do we use it intelligently?** *Kultur-Technik 2026:* *The Human–Digital Synthesis* draws from the European idea that technology is an extension of human culture. In this interactive session, we bring together the Women in Big Data Berlin community to explore how humans and AI will collaborate, build, and evolve together. This is not a passive event— it’s a space to **learn, discuss, and create together.** The event is hosted by **Ojin AixHaus.** Ojin AixHaus is the new, collaborative community space in Berlin Mitte, where scientists, machine learning engineers, founders, creators, and AI enthusiasts come together to build and learn about the future of AI. Ojin AixHaus is free to join, open for startups in residency applications and is currently curating their 2026 events calendar. If you have a burning idea for an event, meetup or hackathon - bring your fire, they bring the space! **💡 Event Details 💡** **1\. Choose and Participate Your Workshop \(60 mins\)** Participants will get to choose and join one of two parallel tracks onsite, and co-create a “chapter” for the final showcase. 🧠 **TECH TRACK: Collective Intelligence & AI in Companies** Facilitator: Dr. Katarzyna Stoltmann Co\-Founder\, Women in Big Data Berlin \| Head of Data Science & AI How do companies truly get the best out of AI? The answer: **collective intelligence**. This session explores: * What collective intelligence means in practice * Which tasks and roles will evolve with AI * Whether AI replaces work—or creates new opportunities ✍🏼 Hands-on focus: Designing end-to-end AI solutions at scale—thinking through how humans and AI systems collaborate to deliver impact for millions of users. 🖼️ Output: A conceptual demonstration of a **“context-aware agent architecture”** 🌟 **IDENTITY TRACK: Visibility & Personal Branding in the Age of AI** Facilitator: Angeley Mullins Founder & CEO, Aetheris Ventures In a world where content and ideas can be generated at scale, how do you stay **visible, credible, and distinctive**? This session explores: * How to position your *human voice* in an AI-driven landscape * What defines authenticity and value in 2026 * How to use AI as a co-creator, not a replacement ✍🏼 Hands-on focus: Define your personal narrative, identify your unique “signal,” and build a strategic approach to visibility through guided exercises and peer exchange. 🖼️ Output: A **“Visible Self Prototype”**—your personal positioning, key content angles, and a simple plan to build credibility and presence in an AI-shaped world **2\. Grand Finale: The 2026 Showcase \(45 mins\)** We come together to share insights from each group: * Tech track presents the “Brain” (AI Agent concept) * Capabilities track presents the “Voice” (Personal Brand & Visibility Strategy in the AI era) We will have networking afterwards where you can continue sharing your ideas! 🗓 **Date: 9 April 2026** **⏰ Time: 18:00 – 21:30** **📍 Location: Ojin AixHaus \| Chausseestraße 36\, 10115 Berlin** Why do we need these workshops? Because AI is moving so fast! - and so should we. Join us to: * Understand AI beyond the hype * Learn how to use it strategically and responsibly * Connect with a community shaping the future 👉 **Choose your track. Join the conversation. Build what’s next. We look forward to seeing you next week!** Find out more here: [Ojin AixHaus Community ](https://ojin.ai/community) Follow Ojin AixHaus on socials: [Instagram](https://www.instagram.com/ojin.ai/#) [Linkedin](https://www.linkedin.com/showcase/ojin-aixhaus/) [X](https://x.com/Ojin_AI)

## **Columbus Bitcoin Meetup – Event** Join us for another great evening dedicated to Bitcoin, learning, and community. We will be gathering in the private room at Olentangy Brewery for an evening of conversation, education, and fellowship with fellow Bitcoiners. This special event will feature three guest speakers sharing insights from across the Bitcoin ecosystem. ### **Guest Speakers** **Lindsay Faust** Relationship Manager at River **Andrew Tilmann** CEO of the Midwest Bitcoin Summit **Carlos Estrada** Founder of Coin Vigilante In addition to speaking during the event, Andrew Tilmann will also be available for a meet and greet. This will be a great opportunity to ask questions about the upcoming Midwest Bitcoin Summit, taking place September 23 and 24 at the Columbus Convention Center. ### **Midwest Bitcoin Summit Discount** Early Bird pricing ends **April 1st**, but you can still save **21%** by using the promo code: **COLUMBUS** Use the link below to apply the discount: [https://tickets.midwestbtc.com/affiliate/columbusbitcoinmeetup/event/midwest-bitcoin-summit-2026/?promoCodeTask=apply&promoCodeInput=columbus](https://tickets.midwestbtc.com/affiliate/columbusbitcoinmeetup/event/midwest-bitcoin-summit-2026/?promoCodeTask=apply&promoCodeInput=columbus) ### **Event Details** This will be a three hour event, with speakers beginning just before 7:00 PM. There will be plenty of time afterward for networking, meeting new friends, and continuing the conversation. Food will be provided. We look forward to seeing you there! ***

**Important time note:** Please plan on arriving between 5:30 and 6:00 as the elevators lock after 6 and you'll need to message us and we'll need to come get you. The building address is 4450 Bridge Park The entrance is 6620 Mooney St, Suite 400 You will need to scan your ID at the door to get a visitor badge. **Abstract** GitHub Copilot is powerful, but what if you could scale from a solo AI assistant to an entire team of specialized agents working in parallel? This session introduces Squad: an open-source framework for multi-agent orchestration that lets you define teams of AI agents with specific roles, responsibilities, and expertise. We'll progress from Copilot basics to the Copilot CLI, explore how Agents add autonomy, and see how Instructions and Skills let you customize agent behavior. Then, the climax: a live demo where a Squad team of 3 agents (Lead, Developer, Tester) stands up and builds a working application in real-time, showcasing true multi-agent collaboration. Whether you're new to AI or exploring how to scale your use of Copilot, this session will show you what's possible when agents work as a team. **YouTube Link** TBD

Central Ohio Radio Enthusiasts—CORE—is an informal community for anyone enthusiastic or curious about radio—whether you're new to radio and want to learn or you've been tinkering for years and want to share. Ham radio operators, GMRS users, Meshtastic fans, software-defined radio nerds, makers, and technical and non-technical folks are all welcome. No experience required or expected. This month we have **WiFi HaLow: Introduction and Practical Use** with **Alex Barbur**. Details are are [core.radio](https://core.radio).

In this local meeting, you will discover knowledge that you can use to get over the past. The key to improving your personal motivation, self-confidence, and happiness is to get over your painful memories. When you become free of your past, you will be free from stress, anger, anxiety and depression. Studies show that negative emotions can affect your health. By being free of negative emotions, believe it or not, you will most likely even look younger, feel more energetic, and become healthier! Be sure to click on the red "Attend" button below to come to this local event. We look forward to seeing you there. This group is brought to you by the Dianetics and Scientology life improvement center.

AI is changing how art is made. But when does it stop being your work and start being the machine’s? This month we're going to be doing a panel with with digital image, music, and written word artists, talking about at what point, while using AI in the creation process, does the work become not the artist creation? We encourage audience participation during this event that will be moderated by Chris Slee. Whether you’re deep in the field or just getting curious, come connect with others building and exploring AI in Columbus. Sponsored by [Transform Labs](https://www.transformlabs.com/services)

Pay attention! We’re delaying a week for those of you who may be on Spring break and/or celebrating the holiday. Ok, no pancakes, but waffles-a-plenty. Join the local UX and Digital Design community for a casual monthly breakfast. Look for us upstairs!