Via Ferrata

Privatsphäre mit Onchain-Bitcoin ist kein Standard-Feature, sondern ein technischer Kampf gegen Wahrscheinlichkeiten. Wir widmen uns an diesem Abend den Methoden, mit denen Analysten versuchen, Zahlungsströme zu deuten und erklären die Logik, die hinter moderner Blockchain-Analysis steckt. **Die Themen des Abends:** **Heuristiken:** Wir erklären detailliert, auf welche Muster und Metadaten geschaut wird, um mit hoher Wahrscheinlichkeit festzustellen, wann Bitcoin tatsächlich den Besitzer wechselt – und wann es sich nur um Wechselgeld (Change) handelt. **Infrastruktur & KYC-Risiken:** Warum deine Privatsphäre schon bei der Abfrage von Daten beginnt. Wir besprechen die Risiken von zentralisierten Services, Public Block Explorern und die Verbindung zu KYC-Daten. Warum ist "**Run your own Node**" essenziell für Privacy? **Lightning Fixes Privacy?** Bietet das Lightning-Netzwerk die perfekte Lösung? Wir betrachten die technischen Trade-offs und diskutieren, wo auch Lightning an seine Grenzen stößt, wenn es um Metadata-Privacy geht. Ein interaktiver, technischer Vortrag (90 Min) mit Raum für Fragen. **Einlass 18 Uhr** **Start 18:30 Uhr** Die Eventlocation wurde freundlicherweise von [Bitcoin.Wien ](https://www.bitcoin.wien/)zur Verfügung gestellt. [Support Bitcoin Austria](https://pay.bitcoin-austria.at/apps/Nbue7dfjRGGcNXcaQ3AqDy1FARY/pos) [Bitcoin.Wien Website](https://www.bitcoin.wien/)

⭐️Speed Networking Vienna Make connections. Find opportunities. Meet new friends. ⭐️Looking to expand your circle, meet inspiring people and actually enjoy the process? This is not just about business contacts — it’s about real human connection, shared interests and new friendships that can grow into something meaningful. 🔄 How it works: 10-minute one-to-one chats, new person each round. Easy, natural and relaxed — no awkward vibes, no forced conversations. ⭐️Perfect for people from different professions who want to connect, collaborate, exchange ideas and simply meet great new people. 💎Price 10€ (cash) and order a drink 📌 Limited spots – registration required. Come for the networking. Stay for the conversations. Leave with new contacts and new friends. 💬✨

Join us for **Indoor** Padel at Padelzone Floridsdorf. **How we play**? Beginners, Intermediate and Advanced Players are welcome. Number of courts depends on the number of players. * 4-5 players: one court * 8-10 players: two courts * 12-14 players: three courts **Price** * between 17-20 € for 2h depending of number of players * I use the money to cover the costs for the court, balls and rackets. * You can pay via Revolut, PayPal, instant Bank Transfer or Cash. I prefer transfer over cash. **Equipment** * I provide balls (usually Bullpadel Next) * If you need a racket, you can rent it from me for 2 € (limited number available). There is also a machine at the venue, where you can rent a racket for 4 € (you need *SportToGo* App to rent from them) **Cancellation** * Please cancel at least 26h before the event, if nobody is on wait list. Otherwise you have to pay a 10 € late cancellation fee. * If people are on wait list, please cancel 10h before the event. Otherwise you have to pay a 10 € late cancellation fee. * Late Cancellation fees will be donated to Médecins Sans Frontières (Ärzte ohne Grenzen). * I understand that sometimes unexpected things can come up. However, not showing up and failing to let me know is considered disrespectful and goes against the Meetup community spirit. You still have to pay the full event fee in such cases. **Important** * Playing competitive is allowed (Smashing balls, hitting balls close to opponent player etc.) * We still value fair play and sportsmanship. * Having fun together is way more important as winning. **Other information** * We are respectful and warm with each other. Our cultural and professional background is diverse * The host or regular players can ask misbehaving players to step out from the court * The host and regular players are entitled to send players to different courts to have balanced teams * The venue has changing rooms and showers free of charge * If you come by car, make sure that you park at Padelzone and NOT at Marco Polo Sportscenter * If you have questions, you can send me a message any time. I speak german too.

Step into confidence and style with our Heels Dance Classes, where elegance meets power. These classes are designed for individuals of all levels who want to embrace their femininity, boost their self-esteem, and have a blast while dancing in heels.

After work meetup today 💎Would you like to make new friends?✨ ⛳️After a long day at work, what’s better than to communicate with great people, good vibes, and city views? Let’s meet, chat, and enjoy the evening together! ✨ Participation fee is 2€ (cash) to cover organizing. Donations are welcome✨ 💎This is your chance to: • Meet new people and catch up with familiar faces • Share stories • Exchange contacts and grow your circle • Soak in the winter vibe💫 ⭐️Please register if you go and unregister if you don’t go. Join us on WhatsApp and don’t miss new events 🔥 https://chat.whatsapp.com/ERvtYIUDqtHLtVwwytpKLZ

Jeden Freitag um 18 Uhr zeigen wir dir bei unserer Tour unseren Maker Space. Es erwarten dich rund 900m2 Werkstattfläche, eine Menge ganz unterschiedlicher Bereiche, viele Maschinen und Geräte. Wir freuen uns auf deinen Besuch!

**PLEASE READ EVERYTHING!!** \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\- **Unique opportunity! Special Guided Tour of the Viktor Frankl Museum!** Limited number of participant spots! Guided tour (in English) to the Viktor Frankl Museum, 1 ½ hrs Date: January 9th, 2026, at 6.30 pm Location/Meeting Point: Mariannengasse 1, 1090 Wien, 1st floor, Museum entrance About the V.Frankl Museum: The neurologist and psychiatrist Viktor Frankl, founder of the "Third Viennese School of Psychotherapy", resided at Mariannengasse 1 since his return to Vienna in 1945 until his death in 1997. It was there that he completed his thesis on the human person as a spiritual being, capable of defeating the worst conditions as soon as and as long as he finds meaning in life. Today Frankl's workplace is an inspirational museum, in which visitors are gradually introduced to Viktor Frankl's life, his philosophy and psychotherapy. In the course of learning about the development of a genius, visitors also gain insight into their own opportunities and personal potential. **Please note: The V.Frankl Museum requires a fixed reservation.** Therefore a contribution of € 23,- (covers the entrance fee as well as a 1 1/2 hour guided tour in English by a guide from the V.Frankl Museum) is required for your confirmed registration. The museum limits the number of participants to 15. (You are entitled to a full refund if you cancel up to 5 days before the event, or if the event is cancelled). **To secure your spot you MUST go to the registration page at** [https://www.eventbrite.com/e/visit-to-the-viktor-frankl-museum-living-a-really-meaningful-life-tickets-1975329444543](https://www.eventbrite.com/e/visit-to-the-viktor-frankl-museum-living-a-really-meaningful-life-tickets-1975329444543) Don’t hesitate to let me know if you have any question at all! Looking forward to seeing you at this unique event! With kind regards, Dieter Langenecker PS: Watch a short video of Viktor Frankl delivering a live lecture: [https://youtu.be/loay2imHq5E?si=koe5hErQva6DJcHj](http://%5Bhttps//youtu.be/loay2imHq5E?si=koe5hErQva6DJcHj%5D(https://youtu.be/loay2imHq5E?si=koe5hErQva6DJcHj)) PPS: Afterwards, we’ll have a bite at a cozy place nearby

(Deutsch unten.) Sunday's portrait sessions start at 3 PM. Everyone is welcome to join our Open Sessions, just bring pencil, paper and any other utensils you may need. (Easels & Boards are available in the atelier). One pose will be maintained for the whole session, so that it is also possible to paint in watercolor, oil, etc. For the breaks we will offer some drinks and snacks. Free snacks and non-alcoholic drinks are available. Registration through this Meetup is suggested but not required. You can pay the 12 Euros fees in cash upon arrival. For more information, feel free to send email at info@viennaatelier.com Looking forward to see you soon! ============================= Die Porträtsitzungen am Sonntag beginnen um 15 Uhr. Bringe Bleistift, Papier und andere Materialen selbst mit, Staffeleien & Bretter gibt es im Atelier. Die gleiche Pose wird, unterbrochen von kleinen Pausen, über den gesamten Zeitraum beibehalten, daher ist es auch gut möglich mit Aquarell, Öl, usw. zu malen. Kostenlose Snacks und alkoholfreie Getränke stehen zur Verfügung. Eine Anmeldung über dieses Meetup wird empfohlen, ist aber nicht erforderlich. Sie können die 12 Euro Gebühr beim Ankommen in bar bezahlen. Für weitere Informationen senden Sie bitte eine E-Mail an info@viennaatelier.com

Nearby Vienna at only 477m, this is an almost surreal mountain scenery fit for Heidi or the Trapp's. First we walk up a steep-ish forest trail until reaching the Apple Cider plateau. From here we continue our route, passing Charlie's Lookout with stunning views until arriving at the actual alp. Following a former cable car track, we descend to a forest hut and further down along an atmospheric creek. Total time: \~5 hours Language: English Bring: Extra water and snack for underway Wear: Firm shoes, rain gear depending on weather Price includes train tickets, beverage and friendly host. Discounts available for early birds, local transit pass holders, repeat participants and groups. In case of severely bad weather, this event will be cancelled and refunded. To secure your spots, please ... Step 1: RSVP here on Meetup first (optional but recommended) Step 2: Complete your booking at https://vienna.ixpat.com/summit

Join your fellow young Americans living in Vienna for our first trivia night! Whether you are new to the city, studying here, or a long-time resident, everyone is welcome to join us for a night of trivia, good company, and conversation. We will have board and card games of all sorts available to play, so come and be a part of our vibrant community and make new friends in Vienna! The location is Charlie P's, a pub, at Währinger Straße 3, 1090 Vienna. We'll be meeting at 7:30pm, and trivia goes from 8-10pm. Can't get there by 7:30pm but can join later, or need to leave early? No problem at all. Hosted by Young Democrats for Democrats Abroad Austria.

Ready for a uniquely European experience? This spectacular route through the easternmost *Donau Auen National Park* will lead us from Hainburg along the Danube main- and sidestreams all the way to a small fishing village near the Slovak border. Expect calming wetlands, country-spanning river views, medieval castles and even walk-through caves hewn into the rocks. Net hiking time on this gem of a trail will be \~3 hours. Discount available for early birds, train pass holders (ÖBB-Klimaticket/Interrail), repeat participants, and groups. To secure your spots, please ... Step 1: RSVP here on Meetup first (optional but recommended) Step 2: Complete your booking at https://vienna.ixpat.com/wetlands

Bouldering Session at the Edelweiss Center. Each participant is responsible for paying their entry fee upon arrival. Keep in mind that you need an Alpenverein Membership after your first trial visit. Meeting at the entrance area and entering together at 14’

(Deutsch unten.) Saturday's figure drawing/painting session starts at 3pm. Bring pencil, paper and any other utensils you may need. Easels & boards are available in the atelier. The long pose will be maintained for about 5 times 20 minutes, so that it is also possible to paint in watercolor, oil, etc. Free snacks and non-alcoholic drinks are available. Registration through this Meetup is suggested but not required. You can pay the 12 Euros fees in cash upon arrival. For more information, feel free to send email at info@viennaatelier.com ============================= Das Aktzeichnen und Malen am Samstag beginnt um 15 Uhr. Bringen Sie Bleistift, Papier und andere Materialen mit. Staffeleien & Bretter gibt es im Atelier. Die lange Pose ist etwa 5 mal 20 Minuten lang, daher ist es auch gut möglich mit Aquarell, Öl, usw. zu malen. Kostenlose Snacks und alkoholfreie Getränke stehen zur Verfügung. Eine Anmeldung über dieses Meetup wird empfohlen, ist aber nicht erforderlich. Sie können die 12 Euro Gebühr beim Ankommen in bar bezahlen. Für weitere Informationen senden Sie bitte eine E-Mail an info@viennaatelier.com

Como viene siendo habitual, nos reuniremos nuevamente en Freiraum. Hay una reserva para 20 personas, y muy previsiblemente nos sentaremos en las mesas altas en las que nos sentamos habitualmente. Como suele venir mucha gente, siempre es recomendable llegar puntual. Durante el horario de invierno empezaremos media hora más temprano (a las 18:30 h). Freiraum está en plena Mariahilferstraße (más concretamente en Mariahilferstraße 117, 1060 Wien), entre las estaciones de metro U3 Zieglergasse y U3/U6 Westbahnhof. El evento tiene la función de que nos juntemos para pasar un rato divertido. No olvides compartir el evento con otras personas interesadas. También tenemos un grupo de Facebook: [https://www.facebook.com/groups/426629184137458/](https://www.facebook.com/groups/426629184137458/) No olvides seguirnos en Instagram: https://www.instagram.com/cafedelalengua/

***FREE TOUR TICKET FOR ALL OF YOU WONDERFUL MEETUP MEMBERS*** Use Promo Code **MEETUP2025** to get your free ticket and route smart guide at [https://www.eventbrite.com/e/sol-in-columbus-oh-a-smart-guided-short-one-way-loop-bikeway-tour-tickets-769120860197](https://www.eventbrite.com/e/sol-in-columbus-oh-a-smart-guided-short-one-way-loop-bikeway-tour-tickets-769120860197) You can do the tour solo/with your favorite peeps, or try to generate a group ride of Meetup CycleNuts by RSVPing here and posting the day and time you are interested in others joining you. Either way, have fun on your memory-making adventure, and thank you for being a CycleNut! ### SOL in Columbus, OH \- A Smart\-guided Short One\-way Loop Bikeway Tour Short One-way Loop (SOL) in Columbus on bikeways. The smart-guided tour is mostly through scenic riverside parks with a quick downtown peek. All of that in 10 miles! 83% of the route is bikeway, and the rest is Google Maps designated "bicycle-friendly roads". This short ride passes through several beautiful riverside parks. Passing through downtown the route runs alongside Huntington Park baseball stadium, Nationwide Arena hockey stadium, near North Market (worth a stop if you enjoy markets with lots of tasty treats), within a few blocks of the state capitol, convention center, art museum, center of science and industry, several first-class hotels, and much more (see Points of Interest list below). Easily, anywhere along the way, the tour can be detoured to nearby points of interest. This smart-guided route comes with CycleNuts' 50% downhill guarantee. Sweating is optional. If your bike has gears, you might use them to climb in a few spots. All bikes are appropriate for this smart-guided tour (even a single-speed if you do not mind walking your bike up the spots mentioned). The route is shaded about 50% of the way. Sweating is optional - you set your pace, starting time, and touring agenda. Points of interest: COSI Scioto River North Market German Village The Scioto Mile Brewery District Huntington Park Nationwide Arena Columbus Union Station Arch Greater Columbus Convention Center **The Meetup plan = Show up, Rally with whoever else shows up, and Roll following the smart-guided instructions.** This is a smart guided tour route that can be ridden any day or time, solo or with others. It is only posted with a repeating set time and date with a tour leader to fit the Meetup format, and, more importantly, to encourage you to get out and ride when it is convenient for you. **If you are going to ride it and would like the company of others, then simply RSVP and post in the comments when it is that you are going to ride - date and time.** Take pictures/videos and share. Have fun! ***This is a repeating event on the calendar***\*, but the date and time do not necessarily need to be what is posted. **If you are interested in riding with a group, then simply RSVP and leave a message in the comment section** giving the date and time you would like others to join you. If you are interested in riding by yourself or with your private group of friends, then simply do it.\* ***The mission of this format is to create a catalog*** *of free group tour routes available for CycleNuts to ride as a group, or solo, in an area spanning several states. **The goal is to get people out cycling** either in groups or solo. **The vision is a cycling community with resources** available for bike tours, bike talk, and a format for lives experienced at the speed of bike.*

We meet at lunch each week and each meeting follows a fairly organized agenda. First all participants pass their business cards around. Then each member and guest is invited to give a one-minute overview of their company and what is a perfect referral for the week. We always have a 10 minute presentation from one of the members about their business in more detail. And finally we pass referrals. You're welcome to visit. Nobody is ever put on the spot. Bring plenty of cards!

**History** [Blacklick Woods Metro Park](https://www.metroparks.net/parks-and-trails/blacklick-woods/), established in 1949, holds the distinction of being the first Columbus Metro Park. Its creation stemmed from a post-World War II push to preserve natural areas amid rapid suburban growth. The land, originally farmland and woodlots along Blacklick Creek, was acquired by the Columbus Metropolitan Park Board through donations and purchases. Early efforts focused on basic trail development and reforestation to combat erosion. The park's name derives from the creek, which early settlers called "Black Lick" due to its dark, mineral-rich waters. By the 1950s, it served as a model for the expanding Metro Parks system. In the 1960s, Blacklick Woods expanded significantly with additional land acquisitions, reaching over 600 acres. A golf course was added in 1964, one of the first public courses in the region, designed to generate revenue for park maintenance. Native American artifacts, including arrowheads from the Adena culture, were discovered during construction, highlighting the area's prehistoric use as hunting grounds. The park introduced interpretive programs to educate visitors on local ecology and history. Flood control measures along the creek became a priority after heavy rains caused damage. These developments solidified its role as a recreational hub. The 1970s and 1980s brought environmental awareness, leading to habitat restoration projects at Blacklick Woods. Invasive species were removed, and native wildflowers were planted in the meadows. A nature center opened in 1976, featuring exhibits on wetlands and forests. The park's slate-covered bridge, a remnant of 19th-century infrastructure, was preserved as a historic feature. Birdwatching gained popularity with the addition of observation decks. Community volunteers played a key role in trail maintenance and cleanups. During the 1990s, Blacklick Woods underwent major upgrades, including paved multi-use trails for biking and hiking. The Walter A. Tucker Nature Preserve, a 53-acre old-growth forest within the park, was dedicated in 1995 to protect rare beech-maple woodlands. Educational partnerships with local schools introduced field trips on topics like stream ecology. The golf course was renovated to improve playability while minimizing environmental impact. Annual events, such as the fall festival, drew thousands to celebrate the park's natural beauty. These enhancements balanced recreation with conservation. In the 21st century, Blacklick Woods has adapted to increasing visitation with sustainable practices. Solar panels were installed at facilities in the 2010s to reduce energy costs. The park now spans 643 acres, offering diverse habitats from wetlands to uplands. Recent initiatives include pollinator gardens and prescribed burns to maintain prairie areas. It remains a flagship for the Metro Parks, inspiring similar preservations system-wide. Ongoing archaeological surveys continue to uncover traces of early inhabitants. **Map of the Park** Here is a [map of Blacklick Woods](https://www.metroparks.net/wp-content/uploads/2025/10/BLK-map-May-2025-with-extended-greenway_1980px.jpg). **Summary** For this event, we will hike about 4.5 miles by doing a couple loops of the Buttonbush, Tucker, Maple Loop, and Beech trails. Blacklick Woods is a very nice park, but it is generally flat and not strenuous, so this will be one of the easier hikes that we do. **Where We'll Meet** Drive all the way to the back of the park to the parking lot that is nearest the Nature Center. There are restrooms here next to the Canopy Walk. We'll meet near these restrooms. Speaking of the [Canopy Walk](https://www.metroparks.net/blog/canopy-walk-is-your-gateway-to-the-sky/), it's not officially part of the event this time. However, if interested people want to freelance and check it out after the hike (before heading to the brewery), that's okay. **After the Hike** After we're done with the trails, we'll head to [Prost Beer & Wine Café](https://prostcafe.com/) for drinks and [food](https://prostcafe.com/reynoldsburg-prost-beer-and-wine-cafe-food-menu). The actual address of the brewery is [7354 E Main St, Reynoldsburg, OH 43068](https://www.google.com/maps/place/7354+E+Main+St,+Reynoldsburg,+OH+43068/data=!4m2!3m1!1s0x8838648cfb8d2dbb:0x545274bab130e9bb?sa=X&ved=1t:242&ictx=111), and we should be there by 5:00 if you just want to do that and skip the hike.

Bring your Raspberry Pi, Arduino, microcontroller, or any other electronic project and join fellow electronics makers for a night of creativity and collaboration! This session is open forum to share your current projects—whether complete or in progress, it’s all interesting! Whether you’re deep into embedded systems, exploring new ideas, or just getting started, you’ll find a welcoming space to collaborate, share, and get inspired. I've been hardware hacking a See N Say to make it say whatever I want - while the project is in progress still, it should be working by this meetup! I'll bring it for demo. [See N Say Project](https://github.com/cdeever/esp32-see-n-say) While we continue to pursue a more permanent venue for this Meetup, we’ll be using public library facilities based on availability. This session will be at the Worthington Park Library in the Olentangy Meeting Room.

❄️ **Spare Yourself a Boring Winter - Bowl With Us!** Avoid social hibernation this winter, join our **6-week social bowling league** starting in January! Whether you're looking to unwind after work, meet new people, or just have a fun night out with pals, this league is perfect for everyone! Chill times, cold drinks, and plenty of chances to connect with others. No matter your skill level, this league is all about having fun and meeting new friends. **;)** **🗓 Thursday evenings \|📍 AMF Sawmill Lanes \| 💵 $74 w/ code MUCOW26** **💻 League Info & Registration**: https://bit.ly/ColumbusBowling **Why Join?** 🎉 It’s only 6 weeks - perfect for a low-commitment social plan 🍻 Great mix of people in their 20s-40s, plus post-game hangs at the bar 🎳 Zero pressure - gutter balls totally welcome! 👕 Free league shirt if you sign up early 🧠 Weekly trivia w/ prizes 💬 Super social - join solo or w/ friends! **Want in?** Join our Meetup team Here for the Beer 👉 **Click here to join** https://tinyurl.com/2559lb7t Or start a team of your own with a few friends - we’ll all be hanging out either way! 📅 League Dates (Thursday evenings): Jan 22, Jan 29, Feb 5, Feb 12, Feb 19, Feb 26 ***(The MeetUp event date is deadline to register for the league.)*** **Cost & What’s Included:** ✔ $74 with discount code MUCOW26 ✔ 6 weeks of bowling (1–3 games/week) ✔ Shoe rentals & full league setup ✔ Trivia, prizes, and great people 👉 **SIGN UP NOW** 💻League Info & Registration: https://bit.ly/ColumbusBowling 🤑Use promo code MUCOW26 to save $20 📸 Follow the fun on Instagram: https://bit.ly/BowlingLeague-IG 📩 Questions? Contact the league: http://bit.ly/2nKHno7 Spots are filling fast – don’t miss out on the fun times!