Decentralized Systems & Applications

Hello everyone! We're very excited to be hosting an IN-PERSON meetup in Jakarta hosted by PT. Virtus Technology Indonesia. We look forward to seeing you there! The address, agenda, and speaker information can be found below. See you there! **📍 Venue:** **PT. Virtus Technology Indonesia** Centennial Tower, Jl. Gatot Subroto No.Kav. 24-25 lt. 39, Karet Semanggi, Kecamatan Setiabudi, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12930 Level 39 Glory Room **Important:** * Please bring your ID \*\*\* **🗓 Agenda:** * 7pm: Doors open * 7pm - 7:30pm: Pizza, Drinks, and Networking * 7:30pm - 8:00pm: Nathaniel Wikamulia, Solutions Engineer, Confluent * 8:00pm - 8:30pm: Additional Q&A & Networking \*\*\* **💡 Speaker:** Nathaniel Wikamulia, Solutions Engineer, Confluent **Talk:** Fraud Detection System using Kafka and Flink **Abstract:** This session walks through how to build a real-time fraud detection system powered by Apache Kafka and Apache Flink, from streaming transaction ingestion to stateful event processing. We’ll explore four complementary detection patterns: simple high-value thresholds, historical spending patterns, geographic anomalies using the Haversine formula, and a combined rule that integrates both behavioral and spatial data. \*\*\* If you would like to speak or host our next event please let us know! community@[confluent.io](http://confluent.io/)

👋 **Hei, kamu yang penasaran Bitcoin bisa dipakai buat apa selain disimpen...** ​Pernah kepikiran nggak kalau Bitcoin bukan cuma soal beli, simpan, atau trading? Ada satu konsep yang sering dibahas di komunitas: **sirkular ekonomi** — ketika Bitcoin benar-benar dipakai, berputar, dan hidup di tengah aktivitas sehari-hari. ​Di meetup kali ini, kita bakal ngobrol santai tentang bagaimana praktik sirkular ekonomi bisa mulai tumbuh dari komunitas. Mulai dari menggunakan Bitcoin untuk transaksi, mendukung merchant yang menerima Bitcoin, sampai membangun kebiasaan baru yang membuat ekosistemnya makin kuat. ⚡ ​Kalau kamu penasaran bagaimana Bitcoin bisa benar-benar “dipakai”, bukan cuma disimpan — ini tempat yang pas buat mulai ngobrol. ​Datang buat diskusi, pulang dengan perspektif baru tentang bagaimana ekonomi yang lebih terbuka bisa dibangun bersama. 🧡 ​Sampai ketemu di meetup! 🧡🚀 ​​ 📌 **Info Penting:** 🔸 Tiket **GRATIS** (peserta beli makan/minum sendiri) 🔸 **NO** promosi altcoin, NFT, atau token lainnya 🔸 100% bahas **Bitcoin** — teknologi, filosofi, dan potensinya 🔗 **Tentang Kami** 🟠 *[Bitcoin Indonesia](https://x.com/bitcoinindo21)*[ ](https://x.com/bitcoinindo21)adalah komunitas nirlaba yang ingin: 📚 Menyebarkan edukasi netral soal Bitcoin 🕊️ Mendorong kebebasan dan kedaulatan individu 🤝 Buka ruang diskusi sehat dan terbuka untuk semua **📲 Telegram: [https://t.me/+OIIRyKQmvJY0MWFk](https://t.me/+OIIRyKQmvJY0MWFk)** **📸 Instagram: [https://instagram.com/bitcoinindo21](https://www.instagram.com/bitcoinindo21)** **🌐 Website: [https://bitcoinindonesia.xyz](https://bitcoinindonesia.xyz/)**

👋 **Hei, kamu yang lagi ngeliatin chart merah dan nggak tau harus ngapain...** ​ Diam? Jual? Nunggu? Kebanyakan orang milih panik. Tapi ada satu kebiasaan sederhana yang justru paling powerful dilakuin pas kondisi lagi kayak gini — dan namanya DCA. 📉➡️📈 ​Di meetup kali ini kita bakal ngobrol santai soal **manfaat strategi DCA (Dollar Cost Averaging) saat fase bear market**—cara sederhana yang sering dipakai banyak orang untuk tetap konsisten tanpa harus pusing menebak harga. 📉 ​Kita bahas bagaimana DCA bekerja, kenapa strategi ini sering dianggap lebih tenang di tengah pasar yang naik turun, dan bagaimana cara melihatnya dari perspektif jangka panjang. ​ Nggak perlu jadi trader atau ahli market. Cukup datang dengan rasa penasaran, ngobrol bareng komunitas, dan lihat bagaimana strategi sederhana bisa membantu menghadapi pasar dengan lebih tenang. ​🧡 Karena di Bitcoin, konsistensi sering kali lebih penting daripada mencoba menebak waktu yang “sempurna”. ​Sampai jumpa di meetup! ​ 📌 Info Penting:🔸 Tiket **GRATIS**, tapi peserta beli makan/minum sendiri selama acara🔸 Tidak ada promosi altcoin, NFT, token, atau proyek “kripto” lainnya🔸 100% tentang **Bitcoin** — teknologi, nilai, dan potensinya untuk dunia 🔗 **Tentang Kami**🟠[ Bitcoin Indonesia ](https://x.com/bitcoinindo21)adalah inisiatif nirlaba yang bertujuan untuk:🕊️ Menyebarkan pemahaman soal **Bitcoin** sebagai alat pembebasan individu⚖️ Mendorong **kedaulatan finansial** lewat edukasi netral dan jujur📚 Menyediakan konten edukasi **open-source & gratis** untuk semua **📲 Telegram: [https://t.me/+OIIRyKQmvJY0MWFk](https://t.me/+OIIRyKQmvJY0MWFk)** **📸 Instagram: [https://instagram.com/bitcoinindo21](https://www.instagram.com/bitcoinindo21)** **🌐 Website: [https://bitcoinindonesia.xyz](https://bitcoinindonesia.xyz/)**

Hey, friend in Jakarta! Now that you joined JakFri... **are you a member of [Jakarta Writers](https://www.meetup.com/jakarta-writers/) yet?** Want to see **pictures** of past events? **[Take a look here!](https://www.meetup.com/jakarta-friends/photos/)** And feel free to upload a few pictures you will take at the event 😊 JakFri and JakCre is **the** biggest, oldest, most active, and most inclusive MeetUp community in Jakarta… and we invite you to join us to join us for this **DIGITAL DETOX evening in THE SKY! No phones will be allowed during this event!** Let's log off and talk to each other in real life! Everyone is always welcome to join our events. Our community is all about creating authentic in-person connections in this urban jungle. Come as you are... it’s the best version of yourself. **ABOUT THE EVENT** Join this **very special event** and take a look at **luxury cars** (Ferrari, Porsches, and more) before heading up to a **cozy rooftoop café & resto** with a stunning view of the **elevated** **MRT train** and the **JakSel skyline**, have a bite and drink with fellow Jakarta Friends and play a few rounds of **free pool (billiard)** in this fabulous terrace overlooking the city! An informal and intimate evening where we favour **authentic connections** **and conversations** instead of big, loud group where you don't manage to go past the superficial "where are you from" and "what do you do" questions. When checking in, everyone will be reminded not to use their phone. This is an event were we disconnect and enjoy each other presence! **No phones are allowed for the duration of the event!** Will you manage? 😉 This is a unique event with **very limited places** as the café is small. There's a table reserved for us inside (airco & non-smoking). First-timers are particularly encouraged to join! Reserve your spot today and make sure you update your RSVP if you cannot come. No show = kicked from the group. Our events are **introvert friendly** and we favour authenticity! Everyone is always welcome to join our events. For this event, we have chosen a small café with an astonishing view and a delicious and diverse food menu. The location is excellent and the view of the MRT train passing a few meters away is absolutely epic. At the entrance of the building there is a shop for luxury cars and you are invitated to take a stroll and feel free to buy one 😉 Be prepared to identify yourself with ID at the entrance for security reasons. Then you can head up with the elevator to the rooftop terrace (having both an inside area with airco and outside/smoking area with pool table). A table is reserved for us under the name "MeetUp". The event starts at 6.30 PM and I strongly recommend to arrive on time. The kitchen closes at 8 PM for the last order. Don't be late and don't miss this opportunity to have an authentic evening with locals and international new friends. We will ask for a split bill and everyone will be paying what they consume. **Pool is free!** **We have organised this event before!** * **[Digital Detox in the Sky at Rocket Café](https://www.meetup.com/jakarta-friends/events/311728808)**[ ](https://www.meetup.com/jakarta-friends/events/311728808)(Nov 2025) You can browse [all future events](https://www.meetup.com/jakarta-friends/events/) and [all past events](https://www.meetup.com/jakarta-friends/events/?type=past) of Jakarta Friends take a look at [pictures of previous events](https://www.meetup.com/jakarta-friends/photos/) to get a sense of the vibe of our group! **ABOUT THE VENUE** * Here's the IG of Rocket Café Fatmawati: https://www.instagram.com/rocketcafe.fatmawati/ * Here you can find all you need about the café: https://share.google/fKZMHUeX4DGIJ8xUD * Rocket Café Fatmawati is located near the MRT Fatmwati (5 minutes walking distance) and we strongly recommend you to skip the hassle of macet, leave the car somewhere, and join by MRT. * The restaurant closes at 9 PM and last order is at 8 PM. The place is small, and attendance to this event is limited to 6 persons. If you cannot join, please **update your RSVP at least 24h before the event** as respect to the organiser and people in the waitlist. **No-shows will be kicked out of the group.** There will be a table reserved for us under MeetUp. At the counter on the main entrance (first floor) you will be required to show your ID and indentify yourself to be let into the building as they care about security and a safe space. **HOW TO REGISTER TO THE EVENT?** To register, just click “Attend”! There are a few simple rules * We kindly ask attendees who cannot manage to join to **update RSVP at least 24 h before the event** as a courtesy to other attendees and event organisers. * Cancellation a few hours before the event still counts as a no-show as it takes the spot away from someone else * Don't be early! We want to eat together * It's OK if you arrive some time after 6.30 PM, but let's try to eat together, shall we! So, try to make it in time. * People in the waitlist **cannot** attend, and are encouraged to check a few hours before the event to see if they got a spot * No show at this event without updating RSVP = removal from the group. * As the place is small, only 6 guests can attend this event and no +1 are allowed. You are most welcome to bring a +1 at another event! Thank you for your understanding and cooperation! **WE HAVE A MEMBERSHIP FEE. HOW DOES IT WORK?** Our community has a **monthly membership fee** that can be paid through the app (**2 USD/month or about 33k IDR/month**). Membership can also be paid as a **yearly membership of 320k IDR** valid for 365 days after payment. Membership fee is offered with a **promo discount to first-timers**, who can become members for **240k IDR/year** (**Option A**). First-timers can decide to join with a **sneek peak price of 50k IDR & pay the remaining 270k IDR at the next event** they attend (**Option B**). Registered +1 can attend for free. Renewals (after 365 days) and upgrades (to join JakCre) are offered at a special rate. All this is aimed at encouraging people to sign up, and then to attend as many events as they like! Yearly membership can be paid at an event (cash/bank transfer/Gopay) or beforehand (bank transfer/Gopay). Text Corrado (+62 8211 489 3580) if you have any questions about membership. Membership to **both** Jakarta Friends and Jakarta Writers is offered for **only** 390k IDR/year (**Option C**). Membership gives **access to all events** plus exclusive perks available only to paying members, like for example our [Give Away Birthday Celebrations with lucky draw](https://www.meetup.com/jakarta-friends/events/300470498) (Sept 2024) or [FREE pasta cooking (and eating 😉) workshop](https://www.meetup.com/jakarta-friends/events/304253623/) (Nov 2024) or [Museum visits with FREE GUIDED TOURS](https://www.meetup.com/jakarta-creatives/events/301738408/) (Sept 2024). To most events, attendees can **bring a +1 for free**, and we have some events open to all (paid and unpaid) members. To all members we **guarantee** to keep organizing plenty of events. You will receive a **full refund** if the group closes down, or if there’s no event happening in three months. In the past 3 years we have organised up to 2-3 events per week (browse past event [of JakFri here](https://www.meetup.com/jakarta-friends/events/?type=past) and [of JakWri here](https://www.meetup.com/jakarta-writers/events/?type=past)). That is, with your membership you can attend up to 5-10 events! We **guarantee** to keep organising plenty of events. You will receive a **full refund** if the group closes down, or if there’s no event happening in three months. **THE RULES OF OUR COMMUNITY** Our communities are: * **Jakarta Friends**: [https://www.meetup.com/jakarta-friends](https://www.meetup.com/jakarta-friends) * **Jakarta Writers (former Creatives)**: [https://www.meetup.com/jakarta-writers/](https://www.meetup.com/jakarta-creatives/) Members often participate in events of both groups. Over the past two years, we held over 250 events with over 2,000 attendees. Attendees rate our events **very positively** and give wonderful feedback, with an average of **4.8**⭐ (out of 5⭐) afrom over 500 reviews ([take a look at our reviews here!](https://www.meetup.com/jakarta-friends/feedback-overview/)) We value diversity, inclusivity, respect, and authenticity. We **do not tolerate** harassment or discrimination of any kinds. * You are invited to join our WhatsApp group where we announce our events regularly: [https://chat.whatsapp.com/BR0sC0BrPbc9xTqvj1qLfx](https://chat.whatsapp.com/BR0sC0BrPbc9xTqvj1qLfx) * Feel free to tag us on Instagram, and we will repost! [www.intagram.com/jakarta.friends.creatives](http://www.intagram.com/jakarta.friends.creatives) * For questions about the event, please post a comment on the event page, or DM the event organisers

Hello, we already have members, so the game is always on!! New Normal for JEB Badminton To support government maintaining restrictions to contain the spread of COVID-19, JEB will update the regulations by setting the game with limited player and applied the following conditions : Fee Join = Rp. 80.000,- / person with max 8 players /court . 2 courts' court no 6&7 Cancellation Policy : A. More than 10 hours before game - no penalty / charge from Fee Join. B. Less than 9 hours before game - a half penalty / charge from Fee Join. Thank you for your kind understanding. Cu soon 🤩

Main Bareng Pickleball at Ancol Tennis Warehouse. Join us for fun, socialising and sports at Ancol Tennis Warehouse.

**Get ready for an evening of brain-teasing fun, great company, and friendly competition!** Join us for our third **Jakarta Social Quiz Night** on **Saturday, April 11th** at the stunning rooftop venue, Koi in Kemang. Whether you're a trivia master or just looking for a fun night out, this is the perfect opportunity to test your knowledge, meet new people, and enjoy a fantastic Saturday evening with a view! This event is free! **📅 Event Details** Date: Saturday, 11th April Arrival: 7:00 p.m. Quiz Starts: 7:30 p.m. sharp Location: Koi, Kemang - Rooftop, 3rd Floor Duration: 7:00 p.m. till late Entry Fee: FREE! **🎯 How It Works** Format: Fast-paced, one question at a time! Teams will have 30-45 seconds to discuss each question before moving to the next - keeping the energy high and the competition exciting! Team Size: 4-6 people per team. We will create teams on the night - it's a great way to meet fellow quiz enthusiasts! Rounds: 7 exciting rounds with a 10-minute break midway: **First Half:** 🌍 General Knowledge 🎬 Movies & TV 🍜 Food & Drink [15-Minute Break - Grab drinks, socialize, recharge!] **Second Half:** 🔬 Science & Technology 💰 Money & Business 🗺️ History & Myths 🧠 Trick Questions & Brain Teasers 💰 **Entry & Prizes** Entry Fee: FREE! Capacity: Limited to 50 people Prizes: Special prizes for the winning team - bragging rights guaranteed! 🏆 **🍹 Food & Drinks** Enjoy Koi's amazing rooftop atmosphere while you play! Food and drinks will be available throughout the evening, with special offers to keep you fueled and refreshed. **👥 Who Should Come?** Everyone is welcome! Whether you're competitive, casual, a trivia newbie, or a seasoned quizzer. This event is all about having fun, making connections, and enjoying a great Saturday night in Jakarta. ✨ **Why Join?** ✅ Test your knowledge across diverse topics ✅ Meet new people in a relaxed, social setting ✅ Enjoy stunning rooftop views at one of Kemang's best spots ✅ Friendly competition with great prizes ✅ FREE entry! ✅ Perfect mix of challenge and fun ✅ Simple format - no phones or screens needed, just your wit! Don't miss out on Jakarta's most social quiz night! Gather your team, bring your thinking caps, and let's see who will be crowned the ultimate trivia champions! 🧠🎉 See you at Koi! **📢 IMPORTANT: Attendance Reconfirmation Required** To ensure accurate headcounts and reduce no-shows, we're implementing an updated reconfirmation system for all events. **Here's how it works:** * All events start with unlimited RSVPs. * 4 days before each event, a reconfirmation form will be posted in the event comments and shared in the WhatsApp group. * You must reconfirm ASAP by submitting the form. Your spot is guaranteed only after you reconfirm. * The form closes once we reach the target attendance number. * Anyone who hasn’t reconfirmed when the form closes will be removed from the attendee list. * If you can’t attend, change your status to Not Going. **Two‑strike rule: If you don’t reconfirm or change your status to Not Going two times, you will be removed from the group.** Thanks for helping us keep things running smoothly. Looking forward to seeing you all there. If you have any questions, please feel free to let me know here or join our friendly and active WhatsApp Group Chat: [https://chat.whatsapp.com/FBQsf4Cv4yWACNs9gbiYNH](https://chat.whatsapp.com/FBQsf4Cv4yWACNs9gbiYNH) Instagram:[ https://www.instagram.com/jakartasocialgroup](https://www.instagram.com/jakartasocialgroup)

## **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!