Decentralized Systems & Applications

Bitcoin Knots a podobné implementace se snaží vynucovat content policy na úrovni mempoolu a odmítají transakce považované za nežádoucí (označované za spam). Lukáš, náš expert na Rust a bitcoin, vám osvětlí tento problém v teorii i v praxi. **🦀 18:00 - 19:00: PREZENTACE** Tato přednáška vysvětluje, proč je filtrování transakcí na základě obsahu neúčinné v jakékoli vrstvě bitcoinového protokolového stacku. Představí dva vzájemně se doplňující argumenty. 1. Z pohledu topologie sítě: v gossip síti, kde i malá menšina uzlů zůstává permisivní, transakce s vysokou pravděpodobností obejdou filtrované uzly. 2. Z pohledu informační teorie: každý protokol, který je dostatečně expresivní, aby byl užitečný, nutně umožňuje steganografické kódování. Prostor platných transakcí je natolik velký, že do něj lze vložit libovolná data způsobem nerozlišitelným od běžné ekonomické aktivity. Filtrování na základě obsahu tak čelí protivníkovi s větším počtem stupňů volnosti než má samotný filtr. **🦀 19:00 - 19:30: LIVE DEMO + Q&A** Součástí prezentace bude živá ukázka agresivního relay uzlu napsaného v Rustu, běžícího na mainnetu, která v reálném čase ukáže tok transakcí napříč různými implementacemi uzlů. **🦀 19:30** **\- 22:00: NETWORKING** Po přibližně 60minutové prezentaci a Q&A zůstáváme na networking u piva, zhruba do 22:00. * **Vstup s registrací zdarma.** * **Pivo zdarma** pro prvních 50 hostů. * **Odměny** za nejlepší otázky. * **Knihy** od Braiins **zdarma**. **🦀 PŘEDNÁŠEJÍCÍ** Lukáš Hozda je expert na Rust, autor knihy Building Bitcoin in Rust a lektor Rust kurzů na Univerzitě Karlově. Přes den pracuje v pražské bitcoinové softwarové společnosti Braiins, kde jeho oficiální pracovní titul zní Braiins Superman. * Stáhněte si jeho eBook [Building Bitcoin in Rust zdarma](https://braiins.com/books/building-bitcoin-in-rust). * Sledujte Lukáše na X: [https://x.com/LukasHozda](https://x.com/LukasHozda) Pokud vás zajímá seriózní Rust engineering, přidejte se k nám. 🔗 https://braiins.com

Another Prague ServiceNow Developer Meetup is here! **What Is It About?** * Meet ServiceNow community, swap war stories, and reconnect with old teammates. * Talks with zero sales pitches — pure tech. * Food, drinks and ServiceNow SWAG on us! **What to Expect** * Presentations on technical topics * Networking, discusions * Drinks and activities designed to spark fun and connection * A chance to get exclusive ServiceNow SWAG and prizes **Agenda** \- 17:00 Doors open and drinks are served\, networking can begin \- 17:30 Welcome from organisers and sponsor \- 17:45 "AI Control Tower implementation stories" presentation by Dhruv Gupta \- 18:15 Networking with drinks \- 18:30 Fireside discussion with Dhruv Gupta on topic of ServiceNow ecosystem \- 19:00 Networking with drinks \- 20:00 Closing of the event **Why You Should Attend?** * Free entry, great content * Swag, prizes, and great company * Real, practical insights from across the ServiceNow ecosystem * Open to everyone — developers, admins, architects, analysts, and the ServiceNow-curious **Special Thanks** Big thanks to **[GuideVision](http://www.guidevision.eu/)** for providing the venue and refreshment! Another round of applause goes to our speaker: Dhruv Gupta **Save Your Spot** Places are limited — register now to secure your place. If you have any dietary requirements or food allergies, please let us know when you register.

🎨 **Art Night at Sophie’s Hostel** 🍷 **Sip. Paint. Express.** Join us for a one-of-a-kind **Art Night** where creativity flows as freely as the drinks! Whether you're a seasoned artist or just looking to try something new, this is your chance to **draw anything you want**, in a relaxed and inspiring setting. 🎨 All painting supplies are provided for just **150 CZK (Pay on arrival either by cash or card)** — or feel free to **bring your own** and join in for free. 🍷 Our **amazing bar** will be open all night, so grab your favorite drink and let the creativity pour. 🕒 There’s **no time limit** — stay as long as you’re vibing. 💫 It’s not about being perfect — it’s about **expressing your feelings through art**. Whether you come solo or with friends, **Art Night at Sophie’s Hostel** is your space to relax, sip, create and meet new people.

Ahoj Péhapkáři! Zveme vás na další sraz komunity. 17:30 – open doors 18:00 – přednášky 20:00 - kvíz & networking Program: 🎤 David Chodúr - Využijte "skills" s AI agenty pro PHP 🎤 Jirka Pudil - Novinky v PHP 8.5 🎤 Milan Šulc - AI v OSS: Jak jsem naboostoval vývoj oss knihoven s AI tooly \-\-\-\- Děkujeme našim partnerům a těšíme se na viděnou! Adresa: Alma Career - Dock in Five, Menclova 2538/2, Libeň \-\-\-

We’re excited to share that after a break, **Outreach meetups are back!** 🎉 This time, we’re returning with a session focused on **engineering leadership**! This event is designed to inspire engineers and managers who want to unlock their full leadership potential without burning out along the way. Whether you’re considering a move into management, are new in the role, or already leading teams at scale, this meetup will offer **practical insights, real stories, and actionable takeaways** from experienced engineering leaders. *** ## 🗓 Talks Schedule 🕕 **17:30 – Doors open** 🎙 **18:00 – Talk 1** **Christian Galatolo, Engineering Director @ Outreach** **How Senior Engineering Managers Scale Without Burning Out** Early in my management career, I unknowingly relied on principles to build a successful new business unit. Years later, with more experience and higher stakes, I learned which principles truly scale and which mistakes quietly turn managers into bottlenecks. This talk shares those lessons, grounded in real successes, real failures, and real pressure. 🎙 **18:40 – Talk 2** **Michael Ruml, Director of Product Engineering @ Mews** **From Surviving to Scaling: Lessons from the First Year of Engineering Management** The transition from engineer to manager is one of the toughest shifts in tech. In this talk, Michael reflects on his first year as an Engineering Manager, unpacking the common traps, hard lessons, and mindset changes that make the difference between burnout and growth. A must-see for anyone navigating—or considering—the move into leadership. 🍺 **19:30 – Networking** After the talks, stick around for networking, discussions, and getting to know fellow engineers and leaders. Outreach will provide **delicious snacks and drinks**, so you definitely won’t go hungry😉 🚀**22:00 – The End** We’re really looking forward to seeing you there! 🚀 \-\-\- *By taking part in this event, you grant the event organizers full rights to the use of images resulting from the photography/video filming, and any reproductions or adaptations of the images for fundraising, publicity, or other purposes. This might include (but is not limited to): the right to use them in printed and online publicity, social media, and press releases.* *If you don’t wish to be photographed, please inform us when you arrive.*

**Here's the Deal** ​We all know the feeling of being stuck or hunting for fresh inspiration. Sometimes a quick scroll helps. More often, it’s honest feedback that moves things forward. ​That’s why STRV and Framer are teaming up for a portfolio night at our Prague office — centered around 1:1 conversations between our designers and you. ​Whether you’re a junior polishing your first case study or a seasoned designer looking to exchange ideas, you’re welcome. Bring your portfolio in any form and sit down with our team for focused, thoughtful feedback. 🎟 Tickets are now available on **[Luma](https://luma.com/STRVMeetups)** \- free entry\, but spots are limited\! Join us and 👉 **[Grab yours here](https://luma.com/DSGN_portfolio_night?utm_source=Meetup).** **Why Come?** * Get honest feedback * Learn something useful * Get inspired * Enjoy solid talks, great people and a beer or two **See you there. Bring a friend.**

**IMPORTANT! Please register on Luma page:** https://luma.com/h71ibm12 ​Join the **Prague Bingo Networking** meetup! ​We’re getting Creative and Tech folks together to network the honest way, through shared, painfully familiar work truths. ​**What is it?** Think of it as an *Anti-Icebreaker Game*. No awkward small talk. No forced networking. ​We’ve collected the thoughts everyone has at work (but never says out loud) and turned them into a fast, interactive **Bingo game**. ​**What we will do:** No laptops. No presentations. ​Just people, music, drinks, and Bingo cards full of “too real” work-life confessions. ​You’ll mark off squares, laugh, cringe, and inevitably say: *“Yep. Same.”* ​**Who is this for?** Creative and Tech Folks who want to meet peers, swap knowing looks, and realize they’re not alone in this industry. ​❗If your plans change after registering, please cancel your spot, it helps someone else join. ​**When & where** 📅 26.02.26 🕛 18:00 - 20:00 Prague Time (CET) 📍 VNITROBLOCK Tusarova 31, 170 00 Praha 7 ​ 🗣 Language: English ​Please arrive 5–10 minutes early to grab a drink and settle in before we start (so we can kick off on time). ​**Agenda** Welcome & rules Bingo rounds Networking & chaos Wrap-up ​See you at **Prague Bingo Networking** 🎉

Join us for an unforgettable day trip through Adršpach and Teplice Rocks, where you you’ll find picturesque sand, deep ravines, gorges and incomparable nature sceneries with rocky corners and snowy hills. Covered in snow, the rocks suddenly look very different, and walking through them is literally dreamy. The waterfalls are hidden in the ice, the rocks are frosted and covered by blankets of snow as if under a winter spell cast by a sorcerer. We will see the real-life locations seen on-screen in the fantasy film The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe. Distance : 12km walk (7 hours) Difficulty Rating : Easy medium Highlights • Hassle-free day trip to Adršpach - Teplice Rocks from Prague • Professional and friendly guide • Transportation by air-conditioned bus • Entrance fee to Adršpach • Enjoy specacular views of gorges, forest, and waterfalls, and explore a maze of the bizarre and aptly named rock formations such as Mayor and Mayoress, the Eagle’s Nest, the Devil’s Bridge • Entrance fee to Teplice Rocks • Immerse yourself in real-life fantasy movie locations • Try typical Czech food in a local tavern More information at : https://www.facebook.com/events/1953723218875137/

🥞 **Free Pancakes Night – Every Friday at Sophie’s Hostel!** 🍻 Where pancakes meet pivo (beer) and strangers become friends. Join us every Friday night at Sophie’s Hostel for our famous Free Pancakes Night! We’ll be flipping stacks of **golden, tasty pancakes — absolutely free** for everyone. 🥞✨ It’s the perfect way to meet new people, chat with locals and travelers, and soak up that warm, friendly hostel atmosphere. Whether you’re enjoying a cold beer, a cocktail, or just relaxing with friends, everyone’s welcome to join the fun and grab a plate. Good vibes. Free pancakes. Great company. What more could you want on a Friday night? 🕖 Time: **Every Friday from 7:00 PM** until the pancake dough runs out 📍 Address: Sophie’s Hostel, **Melounova 1654/2**

Every month, Locus Workspace offers its space to location-independent professionals to work alongside one another for the day just for the price of a coffee (60 kč)! **IMPORTANT: Please note that you need to sign up through the link below to secure your spot for the event:** [SIGN UP HERE](https://locusworkspace.com/events/2026/02/27/coworking-for-a-coffee/) During the day, there may also be community moments you’re welcome to join. This can be as simple as sharing lunch together in the kitchen, enjoying a casual drink at the end of the day, or just chatting with other members by the coffee machine. Don’t be shy, we’re a bunch of friendly coworkers :) Have a good day of productive work, meet other freelancers, digital nomads, remote workers, solo-preneurs, and other location-independent professionals in Prague, and get to know the benefits of coworking.

This group is for anyone who writes - for any reason. Have a thesis or article you need to write? Trying to finish a novel or an academic paper? This group is for you. We are currently meeting in-person at Locus Workspace. If you have any questions, contact Sonya Lano here or on Facebook or Messenger (https://www.facebook.com/sonya.lano). We start at 9:00, introduce ourselves, and share a few words about what we're working on and what we hope to accomplish during the session. At the end of the session, you can give us a brief recap of how it went. We'll break at noon. The afternoon session starts at 2:00 pm. You're welcome to join both sessions or just one. Please come as close to 9:00 as you can if you come for the morning session. If you come to the afternoon session, we are usually back by about a quarter to 2:00.

Calling all tabletop detectives and storytellers in Prague! Join us for an unforgettable evening of intrigue, deception, and drama at **Third Coast Pizza**! Whether you're a seasoned social deduction pro or just curious to try something new, this event is perfect for everyone. Step into the mysterious village of Ravenswood Bluff, where no one is quite who they seem. Will you uncover the **Troublemaker**, protect the town as a **Good** character, or sow chaos as the **Evil**? Every round brings new twists, secret roles, and shocking revelations — perfect for friends old and new. No experience? No problem! We'll guide you through the rules, and you’ll be scheming, bluffing, and deducing in no time. Come solo or bring a crew — the more, the merrier! **When:** Thursday, 26 February from 19:00 onwards **Where:** Third Coast Pizza Mark your calendars, bring your wits, and get ready for a night of suspense, laughter, and unforgettable storytelling. Let the mystery begin! 🕵️‍♂️🕵️‍♀️

**⚠️** You must register for the event on [Luma](https://luma.com/6lta7zul?utm_source=meetup) **⚠️** **Come have a cozy chat about Kotlin!** ​​ ​​Join us for a casual evening of conversation with fellow Kotlin enthusiasts. ​​ ​​**What to expect:** A relaxed atmosphere where you can share your use cases and real-life scenarios, or learn what others are working on. No presentations, no formal agenda—just great conversations. ​​ ​​**Who's invited:** All Kotlin enthusiasts! Any experience level, any use case, any background. ​​ *Hosted by Yasan Ghaffarian (Senior Mobile Engineer)*

Been putting something off for too long? Join us for our **Bi-Weekly** **Co-Working Session** in creative driven **Safe Space Bookstore** — and let’s finally get it done, together. 📲 **Want reminders or to connect with others before/after?** Join our [WhatsApp group](https://chat.whatsapp.com/K6LidaoQhe16wZ0Se9pNM6), Keep contact via [Instagram](https://www.instagram.com/nocrastinationclub/) This is a soft, safe, supportive in-person space to move through procrastination with presence and companionship. Whether you’re working on admin tasks, tax return, writing, creative projects, or simply clearing your inbox — bring whatever you’ve been avoiding and we’ll gently focus beside you. 🕐 **Time**: 3:00 PM – 6:00 PM 📍 **Location**: Jaz in the City – Ground Floor Lounge: Windmühlgasse 28, 1060 Vienna, Austria 💻 **Bring**: Your laptop, journal, creative tools, or anything you’ve been procrastinating on 🌿 **Hosted by**: NoCrastination. ☕ Please do order something from the bar, so as to keep us in their good graces! Donations optional. **🪑Seating information:** * If this is your first time joining us, please look for **Fernando Goncalves** when you arrive * If you’d like to **work independently (without the Pomodoro arrangement)** but still be part of the group energy, just let Fernando know — we’ll make sure you’re comfortably included. 💛 🌱 **What to Expect** * **Drop in anytime** between **3:00–6:00 PM** — stay for a bit or settle in for the whole session * **Clarify your goals**: write down your measurable tasks for the day on a Post-it when you arrive * **Two spaces**: one for quiet focus, one for casual conversation. After each focus session, if you’re still in the flow, feel free to remain seated — no need to move. If you're up for a chat, join others in the social area for a relaxed break. * **Social start**: from **3:00 to 3:30 PM**, we mingle and get to know each other; our first focus session begins at **3:30 PM** * **Gentle structure**: we begin with a soft check-in and intention round * **Pomodoro-style rhythm**: We work in 45-minute focus blocks followed by 15-minute social breaks. If 45 minutes feels too long, feel free to break it into two 20-minute focus sessions with a short 5-minute reset in between. You’ll need to self-regulate these shorter cycles, just tune into your own flow and rejoin when ready. * **Quiet companionship**: no pressure to talk during focus time — just shared presence and support * **Welcoming space**: we meet in the creative, cozy lobby of the **Safe Space Bookstore** 💡 **New to Pomodoro?** Don’t worry — we’ll guide you gently. No apps or timers needed. 💬 Why Join? * Beat procrastination with gentle accountability * Reclaim your momentum without doing it alone * Enjoy a change of scenery that boosts your focus * Be part of a community that shows up — without hustle Bring your project. Bring your presence. Let’s work side-by-side. 💚

We will show a variety of methods for building agents that run in Microsoft Foundry. This covers the different types of agents: Prompt, Multi, and Hosted, as well as the development lifecycle using evals and traces.

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.

Meeting @ Improving's office in Downtown Columbus, near Cosi. Parking is paid, food & drink are free! This time we're hanging out after the long winter break. We are going to look at a group-member's project used to help learn the fundamentals of Go, and if time allows, we can take a look at how we like to build Go projects using AI.

Join other experienced and aspiring agile coaches and professionals to: * develop and practice your coaching skills in a peer-to-peer environment * share current successes and challenges in your work environment and get support from each other * learn from each other, build better relationships and experiment with new ideas

Some trained COUNT volunteers work together once a month at RMH (http://www.rmhc-centralohio.org/volunteer.php) as Housewarmers (usually on the 1st Sunday from 1 – 5 PM). Some schedule other shifts at their convenience. You may try this out with less fuss by following a "Fast track" or go through the normal process. Fast track • Arrange a time to shadow a COUNT volunteer. Call Dave Nohle at 614-268-9558 (cell). • Show up and try it out. • Complete application, etc. later. Normal process • Complete an online application (http://rmhc-centralohio.org/volunteer/). • Attend orientation in advance. • At orientation you will complete forms agreeing to keep family/patient info private and allowing a background check and tour the facility. • Complete one training shift. Daily shifts are: morning 9 AM - 1 PM, afternoon 1 - 5 PM and evening 5 - 9 PM. • Schedule shifts online using the on the RMH scheduling system (http://www.volgistics.com/ex/portal.dll/?FROM=32895). The Ronald McDonald House (RMH) provides housing and meals for families with sick children. The Columbus RMH is the largest in the world with 137 rooms. COUNT has been volunteering there since May 2014. Housewarmers work with RMH guests to provide a home-like environment - greet, assist with family needs, answer phones, give tours, assist with checkin/checkout, prepare guest rooms after checkout, clean facility, laundry, restock supplies and staff the front desk. RMH Housewarmers volunteer at least one four-hour shift a month. All Housewarmers must complete an application and agree to a background check before they can be full fledged volunteers.

Our monthly PHP meetup. A virtual shindig courtesy of Zoom. Check back here for the details around 6:15 pm