Home on Frankfurt Bitcoin Meetup

April 2026: Meetup at Massif Central

Thu, 16 Apr 2026 18:30:00 +0200

The next meetup will again be held in the building of Germany’s oldest private bank. We’ll meet for a relaxed get-together, exchange of ideas and discussions in the Bistro Massif Central.

Open Street Maps
Google Maps
Koordinaten: 50.110097 8.679097

December 2025: Gibson Wintermarket

Thu, 18 Dec 2025 18:00:00 +0100

We’ll meet at the Gibson Wintermarket. They accept Bitcoin payments!

Google Maps

November 2025: Gibson Wintermarket

Thu, 20 Nov 2025 18:00:00 +0100

We’ll meet at the Gibson Wintermarket. They accept Bitcoin payments!

Google Maps

September 2025: Socratic Seminar #4

Thu, 18 Sep 2025 19:00:00 +0200

We’ll host the fourth FFM Socratic Seminar.

These rules exist so that BitDevs participants can speak freely within the event:

No photos, videos, or recordings.
Chatham House Rule: you may reiterate the contents of the meeting without attribution.

Topics:

Security / CVEs / InfoSec / Research

Legal (F)

Network Data

Miscellaneous

Block filter design guide (E)

Delving Bitcoin

BIPs, BOLTs and Proposals

Bitcoin Encrypted Backup (E)

Lightning and L2

A proposal for non-custodial ecash (J)
Alpen’s Public Testnet is now live (J)
ARK Labs documentation (J)
Lightning swaps / ArkLabs HQ post (J)
Lightning Swaps are the connective (J)
Arkade OS documentation (J)
Simplicity Launches on Liquid Mainnet (J)

Bitcoin Core

August 2025: Meetup at Massif Central

Thu, 21 Aug 2025 18:30:00 +0200

We’ll meet at Massif Central Cafe.

Open Street Map
Google Maps
Coordinates: 50.110097 8.679097

July 2025: Meetup at Massif Central

Thu, 17 Jul 2025 18:30:00 +0200

We’ll meet at Massif Central Cafe.

Open Street Map
Google Maps
Coordinates: 50.110097 8.679097

June 2025: Meetup at Massif Central

Thu, 19 Jun 2025 18:30:00 +0200

We’ll meet at Massif Central Cafe.

Open Street Map
Google Maps
Coordinates: 50.110097 8.679097

May 2025: First meetup in new location

Thu, 15 May 2025 18:30:00 +0100

To start of the summer and outdoor season, we’ll meet at the Massif Central Cafe for the first time.

Open Street Map
Google Maps
Coordinates: 50.110097 8.679097

April 2025: Socratic Seminar #3

Wed, 16 Apr 2025 18:30:00 +0200

We’ll host the third FFM Socratic Seminar.

These rules exist so that BitDevs participants can speak freely within the event:

No photos, videos, or recordings.
Chatham House Rule: you may reiterate the contents of the meeting without attribution.

Topics:

Address Poisoning:
- Bitcoin Address Poisoning Attacks
- address poisoning transaction
IBD Booster / SwiftSync PoC
Mining Centralization
- Invalid mining jobs by AntPool & friends during forks
- Bitcoin Mining Centralization in 2025
Bitcoin Core v29.0
- versions 26.x and older are at “Maintenance End”
- release notes
HRF CISA Industry Report
The Evolution of Payjoin
Taproot DoS Vuln
MEVpool
GCC BIP
Quantum Resistance Conversations
OP_CTV now or never?

March 2025: Pleb Talks

Thu, 20 Mar 2025 18:30:00 +0100

We’ll have two pleb talks along with our usual meetup.

February 2025: Simon Satoshi about EuropeanBitcoiners - a P2P education network

Thu, 20 Feb 2025 18:30:00 +0100

Simon Satoshi will talk about “EuropeanBitcoiners - ein P2P Bildungsnetzwerk” (in German).

January 2025: Matthias about Bitcoin in German politics

Thu, 16 Jan 2025 18:15:00 +0100

Dr. Matthias Linkerhand will present about Bitcoin in German politics and the initative “Bitcoin Bundesverband”.

Dezember 2024: Christmas Meetup

Thu, 19 Dec 2024 18:30:00 +0100

There will be Glühwein (mulled wine), secret santa Bitcoin edition, and a trivia card game.

November 2024: Veronika talks about Ark

Thu, 21 Nov 2024 18:30:00 +0200

Veronika presents about Ark.

Slides (Google Drive)

October 2024 Special: FFM Socratic Seminar #2

Wed, 30 Oct 2024 18:30:00 +0100

João Thallis from BitDevs Porto Alegre is hosting a BitDevs in Frankfurt.

Topics:

Bisq adds Lightning support: Bisq v2.1.0 adds the ability for users to settle trades using the Lightning Network.
- https://github.com/bisq-network/bisq2/releases/tag/v2.1.0
Samourai wallet fork
- https://www.nobsbitcoin.com/ashigaru-v1-0-0/
Soft-Fork/Covenant Dependent Layer 2 Review from Peter Todd
- https://petertodd.org/2024/covenant-dependent-layer-2-review
Bitcoin Core project disclosed three vulnerabilities fixed in v25.0
- Public disclosure of three vulnerabilities affecting Bitcoin Core <v25.0
- https://x.com/0xB10C/status/1844705899455062220
Mining: Recent problems with testnet4
- https://x.com/0xB10C/status/1849133671980339313
- miner: Reorg Testnet4 minimum difficulty blocks
Mutation-core: A mutation testing tool for Bitcoin Core
- https://delvingbitcoin.org/t/mutation-core-a-mutation-testing-tool-for-bitcoin-core/1119
Lightspark unveiled new L2, called Spark
- https://x.com/kphur/status/1850001832787210365

October 2024: Come & hang out

Thu, 17 Oct 2024 18:30:00 +0200

We don’t have an talks planned for this meetup.

September 2024: Talk - Bitcoin, ein Zahlungsmittel (Jens Leinert)

Thu, 19 Sep 2024 18:30:00 +0200

Bitcoin, ein Zahlungssystem: Wie man mit Bitcoin bezahlt und Zahlungen akzeptiert

In this presentation, Jens Leinert will talk about the various options for using Bitcoin for payments in bricks-and-mortar retail and online. He shows how Bitcoin can develop into a means of payment and presents various ways in which Bitcoin payments can already be accepted today.

About Jens Leinert Jens Leinert has spent his career in internet e-commerce and as a senior executive at payment providers. He has been passionate about Bitcoin since 2014 and runs an eCommerce agency specializing in Bitcoin projects. He founded Coinpages and Coincharge and is currently responsible for business development at Coinsnap. His goal is to promote the acceptance of Bitcoin payments and to support companies.

The presentation will be in German.

Web: onleines.com
Linkedin: https://linkedin.com/in/leinert
Twitter: @leinert
Nostr: npub1fdwm5pk3g9kxvfyqdxfma9qd6lydtdsjp0ggnk585ahzg0c7zspqqt78nl

August 2024: Outdoor Meetup

Thu, 15 Aug 2024 18:30:00 +0200

We hope for good weather and will meet at the “Grünen Wiese am Mainufer gegenüber EZB” (50.1075616, 8.7036073, Open Street Maps, Google Maps) next to the European Central Bank. Bring blankets or other seating as there are not many benches. The sponsor for the beer is already found and fixed, so please bring some thirst as well as other food and drinks if needed!

In case of bad weather we still have the nearby indoor place as a backup.

July 2024: Outdoor Meetup

Thu, 18 Jul 2024 18:30:00 +0200

We hope for good weather this time and will meet at the “Liegewiese an der Weseler Werft” (50.10775, 8.70107, Open Street Maps, Google Maps) next to the European Central Bank. Bring blankets or other seating as there are not many benches. The sponsor for the beer is already found and fixed, so please bring some thirst as well as other food and drinks if needed!

In case of bad weather we still have the nearby indoor place as a backup.

June 2024: Outdoor Meetup

Thu, 20 Jun 2024 18:30:00 +0200

In case of bad weather we still have the nearby indoor place as a backup.

May 2024: Outdoor Meetup

Thu, 16 May 2024 18:30:00 +0200

Update: Due to the bad weather forcast we’ll meet at “RimeD Pizza und Kiosk” and walk to the original location if the weather turns out to be good.

We will meet at “Liegewiese an der Weseler Werft” (50.10775, 8.70107, Open Street Maps, Google Maps) next to the European Central Bank. Make sure to bring blankets to sit on as benches are limited. If you want, also bring a frisbee or similar outdoor games. There will be some beers, but probably not enough for the whole evening. Bring your own food and drinks!

In case of bad weather, we’ll go to a to-be-determined nearby indoor place.

April 2024: (Pre) Halving Party & "The Genesis Book"

Thu, 18 Apr 2024 18:15:00 +0100

Pre-halving party - the last meetup with 6.25 BTC block subsidy! Aaron van Wirdum will join us to showcase his new book “The Genesis Book”.

March 2024: DAOs im Bitcoin-Kontext - be your own exchange, fund, and everything

Thu, 21 Mar 2024 18:15:00 +0100

Starting at 19:15, Jochen will present on “DAOs im Bitcoin-Kontext - be your own exchange, fund, and everything”.

February 2024: Generational wealth - Nachlassplanung und Verwahrung

Thu, 15 Feb 2024 18:15:00 +0100

Starting at 19:15, genexyz_org will present on “Generational wealth - Nachlassplanung und Verwahrung”.

January 2024: Oridinals and Inscriptions

Thu, 18 Jan 2024 18:15:00 +0100

Starting at 19:15, Lightrider and Freerk from Ordimint will present on the topic “Ordinals and Inscriptions”.

December 2023: Socratic Seminar #1 with Emzy, Timo and Fabian

Thu, 21 Dec 2023 18:15:00 +0100

Emzy, Timo, and Fabian are holding a Socratic Seminar.

Topics

Mining: F2Pool filtering OFAC, Ocean, DEMAND, StratumV2
Review technical bitcoin transcripts and earn sats
Cluster Mempool
83.7 BTC fees
BitVM
- https://bitvm.org/bitvm.pdf
- https://twitter.com/robin_linus/status/1721969594686926935
Mailing Lists Future and Delving Bitcoin Forum
Replacement Cycling Attack
Bitcoin Core 26.0 Release
- https://github.com/bitcoin/bitcoin/blob/26.x/doc/release-notes.md
Wortmarke gesichert: Deutsche Firma geht gegen „HODL“-Merchandise vor!
CVE-2023-50428 und der fragwürdige Versuch einen „Bug“ im Bitcoin-Netzwerk zu beheben!
Stable channels
- https://twitter.com/tonklaus/status/1729567459579945017
- https://www.nobsbitcoin.com/10101-v1-6-1-public-beta/

November 2023: On-chain Analysis & Privacy

Thu, 16 Nov 2023 18:15:00 +0100

Janik is presenting on “On-chain Analysis & Privacy”.

October 2023: Self-Custody & new features in Bitcoin Core v26.0

Thu, 19 Oct 2023 18:00:00 +0100

Mathias is giving a talk about “Self-Custody”, and Timo will explain new featues like P2P traffic encryption (BIP324) and assumeUTXO of Bitcoin Core v26.0.

September 2023: 10 years Bitcoin FFM - Founders Panel

Thu, 21 Sep 2023 18:00:00 +0100

We celebrate 10 years Bitcoin FFM. The meetup funders will join us for a Founders Panel.