BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN X-WR-CALNAME:39th Chaos Communications Congress ICal Feed BEGIN:VEVENT SUMMARY:Intro to the Critical Decentralization Cluster DTSTART:20251227T100000Z DTEND:20251227T101000Z UID:52fff0c0-2470-5ca0-b409-42df8d597649 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/intro- to-the-critical-decentralization-cluster\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/intro-to-the-critical-decent ralization-cluster END:VEVENT BEGIN:VEVENT SUMMARY:The CDC Badge: conference badge & devboard with TROPIC01 and ESP32 -S3 DTSTART:20251227T101000Z DTEND:20251227T105000Z UID:c5330358-1304-59c6-931d-31f8b53ae8a6 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/the-cd c-badge-conference-badge-devboard-with-tropi\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/the-cdc-badge-conference-bad ge-devboard-with-tropi END:VEVENT BEGIN:VEVENT SUMMARY:OpenPGP 2025: Zero → Hero DTSTART:20251227T110000Z DTEND:20251227T130000Z UID:b774ae35-a6be-509f-808a-2e4aeb71df6f CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/openpg p-2025-zero-hero\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/openpgp-2025-zero-hero END:VEVENT BEGIN:VEVENT SUMMARY:What’s Next with Open Hardware at FOSSASIA and Beyond DTSTART:20251227T130000Z DTEND:20251227T133000Z UID:472259a3-7191-54d4-8ed8-3e2365fed7f0 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/whats- next-with-open-hardware-at-fossasia-and-beyo\n\nDescription:\nIn 2025\, te ams at FOSSASIA initiated several open hardware projects developed entirel y from the ground up\, including a new ARM based Pocket Science Lab\, an u pdated LED Badge platform\, and an NFC powered ePaper badge enabling energ y independent content transfer. However\, this session goes beyond a proje ct update. It situates these developments within a wider global movement o f open hardware initiatives across Asia\, Europe\, and other regions. Draw ing on experiences from FOSSASIA as well as broader perspectives from the international open hardware community\, the talk examines where open hardw are is heading as a decentralised\, collaborative practice. With input fro m international experts and community contributors\, the session will expl ore trends emerging\, including evolving manufacturing models\, open silic on and firmware stacks\, supply chain resilience\, and the realities of su staining openness at scale.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/whats-next-with-open-hardwar e-at-fossasia-and-beyo END:VEVENT BEGIN:VEVENT SUMMARY:SeedSigner DIY Bitcoin signing device build workshop DTSTART:20251227T133000Z DTEND:20251227T153000Z UID:fe789c4d-9b9b-5a9d-b2dd-aeb6dc6bc59d CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/seedsi gner-diy-bitcoin-signing-device-build-worksh\n\nDescription:\nSeedsigners are open-source DIY signing devices which can be built using "normal" hard ware like a Raspberry Pi and act as kind of hardware wallets to sign Bitco in transactions. Since the hardware is missing a secure element chip\, the keys are saved externally\, usually via self-drawn QR-codes which are rea d again for every use via the build-in camera.\n\nWe brought a few kits wi th us which we sell for 45€ and build together. We will solder the 40pin GPIO header to the Raspberry Pi Zero\, flashing the firmware on the Micro SD card and then build everything together in the 3d-printed enclosure.\n \nThe kit includes:\nRaspberry Pi Zero 1.3 (without Wifi or Bluetooth chip )\, GPIO-header to solder\nDisplay-Hat with joystick and buttons\nCamera\n 64GB MicroSD card\nMicroUSB to USB-C cable\n3D printed enclosure\n6 printe d templates for self-drawn QR-Codes\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/seedsigner-diy-bitcoin-signi ng-device-build-worksh END:VEVENT BEGIN:VEVENT SUMMARY:Software Liberation Toolbox Exchange DTSTART:20251227T153000Z DTEND:20251227T163000Z UID:b818c405-71b9-57cd-996d-beaf40c75b5e CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/softwa re-liberation-toolbox-exchange\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/software-liberation-toolbox- exchange END:VEVENT BEGIN:VEVENT SUMMARY:Update 2025. Digital integrity of the human person\, A new fundame ntal right. DTSTART:20251227T163000Z DTEND:20251227T170000Z UID:e12de982-7439-548a-aed4-5d5a3ffd4699 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/update -2025-digital-integrity-of-the-human-person-\n\nDescription:\nEvery human evolves today in multi-dimensional physical and digital environment. If ea ch individual is to keep its individuality and autonomy in its choices\, i t must be protected and given effective tools to defend its own autonomy. \n\nRecognizing that human life has been digitally extended must question ourselves on what makes us human today. Should personal data be considered as component of the person\, rather than objects that can be owned by who ever collects that data? Should our digital integrity be protected?\n\nIf each human person already has a right to physical and mental integrity (Sw iss Constitution article 10 al.2)\, shouldn’t it have a right to digital integrity?\n\nAlexis Roussel has been co-authoring a book on the right to Digital Integrity. He is an advocate in digital public policies in Switze rland.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/update-2025-digital-integrit y-of-the-human-person- END:VEVENT BEGIN:VEVENT SUMMARY:Recap and precap of Critical Decentralization Cluster sessions DTSTART:20251227T172500Z DTEND:20251227T173000Z UID:4f430591-a6ec-51cf-a580-8b1917394c98 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/recap- and-precap-of-critical-decentralization-clus\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/recap-and-precap-of-critical -decentralization-clus END:VEVENT BEGIN:VEVENT SUMMARY:The Mask-Off Moment for Digital Identity DTSTART:20251227T173000Z DTEND:20251227T180000Z UID:85f3cd1a-fe3a-56f8-8b41-aa7a75ce8f28 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/the-ma sk-off-moment-for-digital-identity\n\nDescription:\nDespite decades of cry ptography\, security practice\, and best practice deployment\, digital ide ntity remains the weakest link in systems design because its core terms st ay vague while its consequences are concrete. What does it actually take t o assemble a digital identity? What do different implementations share\, e ven when they claim to be radically different? And what happens when those definitions are left elastic enough to serve whoever holds power?\n\n"The mask-off moment" tracks the convergence of capability (biometrics\, senso rs\, AI triage\, mass digitisation)\, institutional incentives (risk scori ng\, eligibility gates\, compliance automation)\, and political will. The result is an emerging form of bureaucratic violence we are not prepared to name\, much less govern.\n\nThis talk traces how digital identity became weapon-ready through optimistic framing and opportunistic ambiguity\, then offers a concrete frame to interrogate any proposal: what it will do on i ts best day\, what it will do on its worst day\, and which parts of the sy stem will be impossible to “add accountability to later.” The intended audience is policymakers\, technologists\, designers\, and civil-society people who are tired of vague promises and want a usable model that surviv es contact with reality.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/the-mask-off-moment-for-digi tal-identity END:VEVENT BEGIN:VEVENT SUMMARY:Breaking into Wireless Smart Homes\, Z-Wave example DTSTART:20251227T180000Z DTEND:20251227T183000Z UID:fc95c6d0-b427-5110-81a5-62504dc1ce8d CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/breaki ng-into-wireless-smart-homes-z-wave-example\n\nDescription:\nYou will lear n:\n- security mechanisms and algorithms used in modern IoT smart home and smart building protocols and how they evolved\,\n- various ways to break existing Z-Wave networks (DDOS or key stealing during inclusion)\,\n- new features in Z-Wave and Z-Wave Long Range protocol closing the described ho les\,\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/breaking-into-wireless-smart -homes-z-wave-example END:VEVENT BEGIN:VEVENT SUMMARY:Namecoin and Tor PKI 2025 DTSTART:20251227T183000Z DTEND:20251227T190000Z UID:8ee9d576-ecb3-51b9-b6d1-2308a2d5a907 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/nameco in-and-tor-pki-2025\n\nDescription:\nTopics to be covered include:\n\n* Ho w we can use Namecoin as a PKI with ~0 bytes of blockchain overhead.\n* Ho w Namecoin's smart contract functionality (allowing multisig and timelocks to control updating a name) interacts with PKI use cases.\n* How we gener alized Namecoin and Tor PKI to work with non-TLS protocols.\n* How revocat ions can be handled securely.\n* How we ensured anonymity (including Tor s tream isolation) despite TLS implementations not providing API's for this. \n* How the anonymity protections actually *improved* performance.\n* How all of the above interoperates with existing software.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/namecoin-and-tor-pki-2025 END:VEVENT BEGIN:VEVENT SUMMARY:How to Contribute to Open Source Projects: Stack Wallet\, Monero\, Tor (Arti!) DTSTART:20251227T190000Z DTEND:20251227T193000Z UID:72e670d3-7a90-5874-8f88-cbffe59e57e8 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/how-to -contribute-to-open-source-projects-stack-wa\n\nDescription:\nStarting wit h Tor and The Tor Project's new Rust project Arti (A Rust Tor Implementati on)\, we'll walk through how to build\, set up for development\, and submi t Pull Requests which have a good chance of being accepted. We'll proceed to Monero development\, both for the original C++ codebase as well as the newer Cuprate project\, a Rust Monero implementation\, and what's coming for both. Finally\, we'll look at how Stack Wallet incorporates and provi des a UX for both Tor and Monero.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/how-to-contribute-to-open-so urce-projects-stack-wa END:VEVENT BEGIN:VEVENT SUMMARY:"What can a mixnet do? Strategies for network-level anonymity" DTSTART:20251227T193000Z DTEND:20251227T213000Z UID:aa332267-221e-55ea-baae-b63eee8545b8 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/what-c an-a-mixnet-do-strategies-for-network-level-\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/what-can-a-mixnet-do-strateg ies-for-network-level- END:VEVENT BEGIN:VEVENT SUMMARY:Intro to the Critical Decentralization Cluster DTSTART:20251228T095000Z DTEND:20251228T100000Z UID:efda9e93-97d4-5833-b91c-bec7cedb3d19 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/intro- to-the-critical-decentralization-cluste_df6i\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/intro-to-the-critical-decent ralization-cluste_df6i END:VEVENT BEGIN:VEVENT SUMMARY:Intro to Tropicsquare TROPIC01 Workshops at CDC DTSTART:20251228T100000Z DTEND:20251228T102000Z UID:81efde89-e887-526a-b12e-14da8d822bc6 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/intro- to-tropicsquare-tropic01-workshops-at-cdc\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/intro-to-tropicsquare-tropic 01-workshops-at-cdc END:VEVENT BEGIN:VEVENT SUMMARY:Open Legal Q&A with Judith de Boer: "Can I Get Arrested for Writin g Code?" DTSTART:20251228T100000Z DTEND:20251228T110000Z UID:8e705309-d766-5ad7-9ab7-80422c1c171c CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/open-l egal-qa-with-judith-de-boer-can-i-get-arrest\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/open-legal-qa-with-judith-de -boer-can-i-get-arrest END:VEVENT BEGIN:VEVENT SUMMARY:iroh p2p chat over gossip DTSTART:20251228T113000Z DTEND:20251228T133000Z UID:b76f1718-fbb1-5dfc-90ee-d6fd8b961d3c CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/iroh-p 2p-chat-over-gossip\n\nDescription:\niroh is a library to establish direct connections between two peers. The workshop will start with an overview o f how iroh works and what it provides. After this we'll explore establishi ng connections between two endpoints before progressing to using a gossip protocol to send messages to multiple peers. At the end we should have a s implistic group chat application.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/iroh-p2p-chat-over-gossip END:VEVENT BEGIN:VEVENT SUMMARY:Embedding Anonymity Directly in your Application DTSTART:20251228T133000Z DTEND:20251228T153000Z UID:f37104e3-211a-58af-a952-5a5c8377e724 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/embedd ing-anonymity-directly-in-your-application\n\nDescription:\nAnonymity is m ore important than ever\, and it's not an easy job. Our job is to make it easier! The I2P project is excited to demonstrate 2 new projects\, the `go -i2p` and `emissary` embedded router projects. We'll look at how they work and why they're an easier\, more accessible way of providing anonymity to your users than freestanding external services. Primary target audience i s Go\, Rust\, and C developers\, I2P library developers\, and people worki ng on anonymous P2P applications.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/embedding-anonymity-directly -in-your-application END:VEVENT BEGIN:VEVENT SUMMARY:Zero-Knowledge Proofs Workshop DTSTART:20251228T153000Z DTEND:20251228T163000Z UID:18e536a7-4688-563c-a165-ea7d5e6fc8d0 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/zero-k nowledge-proofs-workshop\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/zero-knowledge-proofs-worksh op END:VEVENT BEGIN:VEVENT SUMMARY:Radicle: P2P\, Censorship-Resistant Code Collaboration Based on Gi t DTSTART:20251228T163000Z DTEND:20251228T170000Z UID:5bf7ce29-ffb1-51df-ba8f-9864b23f58d4 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/radicl e-p2p-censorship-resistant-code-collaboratio\n\nDescription:\nToday\, much of the open-source ecosystem depends on a few centralized code forges\, e ven though modern version control systems are designed with fully distribu ted collaboration in mind.\nThis creates questionable dependencies with re gards to governance and supply-chain security.\nIn this talk\, we explore an alternative: [Radicle](https://radicle.xyz/)\, a decentralized\, peer-t o-peer code collaboration stack built on Git\, that empowers developers to work together while staying sovereign.\n\nUnlike traditional\, centralize d code forges that can impose censorship\, Radicle ensures that each user retains control over their data\, interactions\, and collaboration\, free from corporate influence.\nThis aligns with broader movements toward decen tralization\, open-source software\, and the democratization of internet s ervices.\n\nWe introduce the system\, provide a progress update\, and shar e what we are currently working on.\n\nAttendees gain a comprehensive unde rstanding of Radicle’s technical architecture\, its practical benefits f or decentralized code collaboration\, and how it contributes to a more aut onomous and resilient future for open-source development.\n\nFind out more :\n - [FAQ of the project (radicle.xyz)](https://radicle.xyz/faq)\n - [*Ho w we built a gossip layer and CRDT on top of Git* by Alexis Sellier at Git Merge 2024 (youtube.com)](https://www.youtube.com/watch?v=tsVa53SPIHc)\n - [Release Notes for 1.0 (radicle.xyz)](https://radicle.xyz/2024/09/10/radi cle-1.0.html)\n - [radicle.zulipchat.com](https://radicle.zulipchat.com)d \n\n*Free your code!*\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/radicle-p2p-censorship-resis tant-code-collaboratio END:VEVENT BEGIN:VEVENT SUMMARY:The Bitcoin Security Budget and Its Implications A Look at the Sec urity\, Scaling and Spam Resistance of Proof of Work Cryptocurrencies DTSTART:20251228T170000Z DTEND:20251228T174000Z UID:1c7a26ad-1d1d-53f2-aa09-23e623b6fa3e CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/the-bi tcoin-security-budget-and-its-implications-a\n\nDescription:\nSatoshi Naka moto released Bitcoin: A Peer-to-Peer Electronic Cash System\, in October 2008\, https://bitcoin.org/bitcoin.pdf\, during the 2008 financial crisis . The Bitcoin genesis block was mined in January 2009 launching the Bitcoi n network. The design of Bitcoin has a maximum money supply of 21 million Bitcoin (BTC). The security budget consisting of the block reward and tran saction fees per block is paid to the miner (creator) of each block as an incentive to secure the network. The blocks in Bitcoin are approximately e very 10 minutes. The block reward is required by consensus to halve approx imately every 4 years\, starting at 50 BTC per block in 2009\, and is curr ently at 3.125 BTC per block. This leads to a current annual growth rate o f the total Bitcoin money supply that is below 1%. The next halving to 1.5 625 BTC is estimated to occur in April of 2028. Transaction fees are curre ntly less than 1% of the total Bitcoin security budget.\n\nIt is claimed i n section 6 of the Bitcoin whitepaper that:\n\n“Once a predetermined num ber of coins have entered circulation\, the incentive can transition entir ely to transaction fees and be completely inflation free”\;\n\nhowever n o evidence\, theory or references are provided to support this claim.\n\nT he above model\, with some variations\, has been followed by most of the t op proof of work cryptocurrencies\, including Bitcoin Cash (BCH)\, Litecoi n (LTC)\, and ZCash (ZEC). There are however some notable exceptions\, Dog ecoin (DOGE) and Monero (XMR). Both Dogecoin and Monero have fixed block r ewards. In Dogecoin this was the result of a bug in the code\; however in Monero a fixed minimum block reward or tail emission was deliberately set at the constant rate 0.6 XMR per block. The blocks in Monero are approxima tely every 2 minutes. This leads to an annual growth rate of the total Mon ero money supply that is below 1%. For comparison the historical annual co mpounded rate of growth of the gold money supply is close to 1%.\n\nThe fe e market in a cryptocurrency is also highly dependent on whether the block size is fixed\, as in Bitcoin\, Dogecoin\, Litecoin and ZCash or adaptive as in Bitcoin Cash and Monero. In the case of adaptive blocksizes the que stion becomes: Is there a penalty (cost) to increase the blocksize as in M onero or no cost to increase the blocksize as in Bitcoin Cash?\n\nA balanc e needs to be found in the design of a cryptocurrency between allowing for blocksize growth in order to support the transaction demand for peer to p eer electronic cash\, and the necessity of spam mitigation. The use of p rivacy preserving technologies can also have a profound impact on this bal ance\, by increasing the transaction size\, while at the same time prevent ing the use of censorship\, as a means of spam mitigation. In Monero for e xample this increase will be by a factor of around 20 times\, after the up coming Full Chain Membership Proofs\, plus plus (FCMP++) hard fork. This m akes finding this balance in cryptocurrencies such as Monero with no optio n to opt out of privacy\, by far the hardest. On the other hand a solution that works in Monero will also work in a cryptocurrency with a lesser deg ree of privacy.\n\nIn the presentation we will discuss the following quest ions:\nHow do the various types of fee markets: fixed blocksize\, adaptive blocksize with penalty\, and adaptive blocksize without penalty work?\nCa n transaction fees replace the falling block rewards or are fixed block re wards necessary?\nAre there advantages or disadvantages to replacing block rewards with transaction fees?\nIs it possible to have a fixed block rewa rd and still be inflation free? \nDo we have a peer-to-peer electronic cas h system or just another kind of asset for investment and speculation usin g centralized financial institutions?\nIs a worldwide peer-to-peer electro nic cash system possible now or in the foreseeable future?\n\nWe will also discuss some of the broader implications\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/the-bitcoin-security-budget- and-its-implications-a END:VEVENT BEGIN:VEVENT SUMMARY:Real World Timestamping With OpenTimestamps DTSTART:20251228T180000Z DTEND:20251228T183000Z UID:d02f5178-f72a-5e59-83d1-fe70f689e3b8 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/real-w orld-timestamping-with-opentimestamps\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/real-world-timestamping-with -opentimestamps END:VEVENT BEGIN:VEVENT SUMMARY:Recap and precap of Critical Decentralization Cluster sessions DTSTART:20251228T185500Z DTEND:20251228T190000Z UID:2be7ff6f-0d6f-5a12-8a4b-ec45281c11f5 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/recap- and-precap-of-critical-decentralization_ct48\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/recap-and-precap-of-critical -decentralization_ct48 END:VEVENT BEGIN:VEVENT SUMMARY:Passkeys : the good\, the bad\, the ugly DTSTART:20251228T190000Z DTEND:20251228T193000Z UID:8ec7a7ac-a2bb-5771-ab5f-e0e87ed7c84d CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/passke ys-the-good-the-bad-the-ugly\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/passkeys-the-good-the-bad-th e-ugly END:VEVENT BEGIN:VEVENT SUMMARY:DIY Bioreactors for mycology and biohacking DTSTART:20251228T193000Z DTEND:20251228T200000Z UID:5287a06c-cc15-571c-a4fd-4f716631fac2 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/diy-bi oreactors-for-mycology-and-biohacking\n\nDescription:\nMycology is one of the fastest growing hobbies in the biohacking/microbiology scene\, people cultivate and grow mushrooms for their taste\, nootropic properties\, and even as construction materials.\n\nBioreactors\, while rarely found on a h obbyist's desk - are the proper way to carry out cultivation and innoculat ion of micro-organism. This talk will explain their principles in simple t erms\, as well as showing off the speaker's journey building a reproducibl e and affordable reactor.\n\nBioreactors are not usually found in hobbyist s mushroom growers yet they enable:\n- Very fast culture times compared to usual jars\n- Efficient and sterile innoculation and expansion\n- Cultiva tion not just of mycelium\, but of any microorganism such as algae\, or ev en insulin producing bacteria\n\nThe demonstrator that will be presented e nables not only cultivation of mycelium of all types\, but also cultivatio n of complex micro-organisms such as insulin-producing bacteria\, and othe r DIY-medicine goals.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/diy-bioreactors-for-mycology -and-biohacking END:VEVENT BEGIN:VEVENT SUMMARY:"Referendum Citoyen" the revolutionnary app DTSTART:20251228T200000Z DTEND:20251228T203000Z UID:09d208db-424d-5cd5-9fac-47c5c36022d4 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/refere ndum-citoyen-the-revolutionnary-app\n\nDescription:\nThe voting app is a s imple blockchain voting app\, based on ZK proof generated from a french ID card. The presentation will deep dive in the tech part\, first but also p resent the social movement that wants to bring the referendum culture in F rance through a voting system that is independent from the State infrastru cture\, but still can prove that voters are french with the ID digital sig nature.\nThe voting app is Work in Progress and needs a lot of work. This is also an open call for hackers to help improve and make the app the easi est app for people.\n\nhttps://github.com/ReferendumCitoyen/referendum-cit oyen-react-native\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/referendum-citoyen-the-revol utionnary-app END:VEVENT BEGIN:VEVENT SUMMARY:XMPP and metadata DTSTART:20251228T210000Z DTEND:20251228T213000Z UID:7244e819-2373-59ed-a745-c8953f1874f2 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/xmpp-a nd-metadata\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/xmpp-and-metadata END:VEVENT BEGIN:VEVENT SUMMARY:GNU Boot install party DTSTART:20251228T213000Z DTEND:20251229T013000Z UID:2c6aa023-a1e0-59f8-919d-353bf9cc3248 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/gnu-bo ot-install-party\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/gnu-boot-install-party END:VEVENT BEGIN:VEVENT SUMMARY:Welcome to CDC day 3 DTSTART:20251229T092500Z DTEND:20251229T093000Z UID:f72a1a4f-5656-57cc-ad7e-7d1e32b13a8b CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/intro- to-cdc\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/intro-to-cdc END:VEVENT BEGIN:VEVENT SUMMARY:Getting started with the Pocket Science Lab DTSTART:20251229T093000Z DTEND:20251229T113000Z UID:17f71125-5e40-599d-802f-3b884d91ffdf CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/gettin g-started-with-the-pocket-science-lab\n\nDescription:\nLearn how to use th e PSLab's range of onboard instruments to make measurements and output con trol signals.\n\nThis workshop will walk you through how to:\n- Measure vo ltage and resistance using the multimeter\n- Measure time-series voltage w ith the oscilloscope\n- Measure time-series digital signals with the logic analyzer\n- Output variable voltage with the signal generator\n- Output d igital signals with the PWM generator\n\nChoose between using the Python A PI or the Android application\, or both!\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/getting-started-with-the-poc ket-science-lab END:VEVENT BEGIN:VEVENT SUMMARY:(Outdoor) Ballooning with antennas DTSTART:20251229T120000Z DTEND:20251229T121500Z UID:c71f3598-99ad-5960-9a73-bc9a5767b3ba CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/indoor -ballooning-with-antennas\n\nDescription:\nHumans are ugly bags of mostly water and they and their infrastructure attenuate the RF signals we need f or communication.\nWe'll explore concepts that are possible due to miniatu risation of RF devices and their constraints. In the end we'll raise a tet hered balloon with Meshcore and a Reticulum node indoors or - depending on the situation - outdoors and playfully check the range we can achieve.\n \nWe'll discuss\n- what we trying to achieve / the problem at hand\n- the physical\, electrical and financial constraints of our solution compared t o other approaches\n- what changed\, why can we do this in 2025 but not in 2015?\n\nIn the end we'll raise a tethered balloon with Meshcore and a Re ticulum nodes indoors or - depending on the situation - outdoors and playf ully check the height and range we can achieve.\n\nThis is a fun workshop that wants to encourage people to play with compact yet easily deployable communication infrastructure\, there will be some basic maths and diagrams \, but nothing intimidating.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/indoor-ballooning-with-anten nas END:VEVENT BEGIN:VEVENT SUMMARY:State of the Decentralization in Industry DTSTART:20251229T121500Z DTEND:20251229T123000Z UID:bd88d0ec-2127-5185-a1b4-13302ca49bd5 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/state- of-the-decentralization-in-industry\n\nDescription:\nOpen-source is fun an d exciting\, but it often gets relegated to 'hobby'\, but there are indust ry applications. Come learn about various businesses that use open-source libraries every day\, and how you can turn your open-source contributions into work\, lifestyle\, or even changing the world.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/state-of-the-decentralizatio n-in-industry END:VEVENT BEGIN:VEVENT SUMMARY:The CDC Badge: conference badge & devboard with TROPIC01 and ESP32 -S3 DTSTART:20251229T123000Z DTEND:20251229T130000Z UID:365c9a9d-7945-5e73-a717-7bf817d19f91 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/the-cd c-badge-conference-badge-devboard-with-_420t\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/the-cdc-badge-conference-bad ge-devboard-with-_420t END:VEVENT BEGIN:VEVENT SUMMARY:Talk with Industry Cryptographers and Developers DTSTART:20251229T130000Z DTEND:20251229T140000Z UID:f29c72cb-f210-5300-b22b-ee74f0146343 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/talk-w ith-industry-cryptographers-and-developers\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/talk-with-industry-cryptogra phers-and-developers END:VEVENT BEGIN:VEVENT SUMMARY:Leveraging LLMs for Preventing De-anonymization: Occlumask DTSTART:20251229T140000Z DTEND:20251229T143000Z UID:0f2775c2-d776-5dc0-89e1-5b128daf79c5 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/levera ging-llms-for-preventing-de-anonymization-oc\n\nDescription:\nHave you eve r mentioned the weather? Maybe offhandedly complained about mosquitoes? Th en you may have inadvertently given away crucial bits of who you are and w here you are.\nOcclumask is a new tool for detecting content-based anonymi ty leaks like this\, utilizing the capabilities of large language models t o provide more accurate 'coverage'. Come and learn about the reasoning beh ind Occlumask's development\, and the various considerations that had to b e made during its development.\n\nTopics covered in this talk:\n\n* How do es this work fill a gap in the broader anonymity tool context of Tor\, sty lometry\, etc?\n* Background of content-based data-leak prevention tools. \n* What is Occlumask and how does it work?\n* Why use an LLM for this?\n* Unique challenges faced by using an LLM.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/leveraging-llms-for-preventi ng-de-anonymization-oc END:VEVENT BEGIN:VEVENT SUMMARY:Occlumask Demo & Brainstorming Session DTSTART:20251229T143000Z DTEND:20251229T163000Z UID:f06b2b45-89d1-5fc8-b7d4-d6d466e57a2f CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/occlum ask-demo-brainstorming-session\n\nDescription:\nOcclumask still has a long development ahead of it\, and we want Occlumask to be as comprehensive as possible when it comes to detecting potential content-based data-leaks. I n this workshop\, we will be demoing a prototype of Occlumask for you to t ry. Alongside this\, we will be asking how you would likely be using Occlu mask\, and what you think Occlumask should do for you.\n\nCome if you have ideas on:\n* What information do you consider important/sensitive?\n* Wha t kinds of situations should Occlumask be able to handle?\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/occlumask-demo-brainstorming -session END:VEVENT BEGIN:VEVENT SUMMARY:SocksTrace: Preventing Proxy Leaks in Your Applications DTSTART:20251229T163000Z DTEND:20251229T170000Z UID:11e2394c-c225-537f-8d1a-2de3dd6872b4 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/sockst race-preventing-proxy-leaks-in-your-applicat\n\nDescription:\nSocksTrace i s a Linux-based proxy leak detector and traffic proxifier built on seccomp -notify. By intercepting network syscalls directly in the kernel\, it prov ides runtime-agnostic visibility and enforcement that works even for stati cally linked binaries and modern browsers.\n\nThe talk showcases real WebR TC-related proxy leaks discovered using SocksTrace\, explains shortcomings of traditional tools\, and demonstrates transparent SOCKSification\, DNS enforcement\, and safe handling of applications that launch their own Tor instances. We conclude with practical use cases and future directions for syscall-level network containment.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/sockstrace-preventing-proxy- leaks-in-your-applicat END:VEVENT BEGIN:VEVENT SUMMARY:qaul - Decentralized Off-the-Grid Mesh Communication App DTSTART:20251229T170000Z DTEND:20251229T173000Z UID:86448483-e0f0-5719-8453-86d03d99e5d8 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/qaul-d ecentralized-off-the-grid-mesh-communication\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/qaul-decentralized-off-the-g rid-mesh-communication END:VEVENT BEGIN:VEVENT SUMMARY:Decentralized Syndication — The Missing Internet Protocol DTSTART:20251229T173000Z DTEND:20251229T180000Z UID:5aff7e34-29b3-5f04-84a0-326e3c7ac072 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/decent ralized-syndication-the-missing-internet-pro\n\nDescription:\nI have imple mented a conceptual decentralized content sydication platform and would li ke to tell more about the philosophy behind it.\n\nThe workshop will consi st of two parts: 30 min presentation about the concept and 30 min workshop where participants would try to publish their social post on RSDS network .\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/decentralized-syndication-th e-missing-internet-pro END:VEVENT BEGIN:VEVENT SUMMARY:A Brief History of Keeping Secrets DTSTART:20251229T180000Z DTEND:20251229T183000Z UID:e860e296-72da-532c-a4a0-bee85f11ac57 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/a-brie f-history-of-keeping-secrets\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/a-brief-history-of-keeping-s ecrets END:VEVENT BEGIN:VEVENT SUMMARY:Pre-Quantum to Post-Quantum Cryptography DTSTART:20251229T183000Z DTEND:20251229T193000Z UID:85bf2c41-0285-5cb5-b111-91d44cc226bf CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/pre-qu antum-to-post-quantum-cryptography\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/pre-quantum-to-post-quantum- cryptography END:VEVENT BEGIN:VEVENT SUMMARY:be-BOP: Ethical Commerce\, Without the Middlemen DTSTART:20251229T193000Z DTEND:20251229T200000Z UID:25e63a18-890b-5187-a751-5000c8ba7efc CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/be-bop -ethical-commerce-without-the-middlemen\n\nDescription:\n**be-BOP is free and open-source software for sovereign commerce.**\n\nIt’s built on a si mple belief: merchants and communities should own the tools they depend on . We design technology that respects privacy\, rejects dark patterns\, and removes the need for accounts or intermediaries. Our vision is trade with out platforms\, data brokers\, or gatekeepers — commerce as a public goo d\, not a private empire.\n\nUnlike fragmented “self-commerce” tools\, **be-BOP is a complete\, batteries-included stack**. It supports e-commer ce\, point-of-sale\, restaurant systems\, ticketing\, peer-funding\, and s ubscriptions — all self-hosted\, interoperable\, and designed for real-w orld merchants. It aims for the reliability of a platform\, without the ca pture of one.\n\nAdoption grows from the edges: merchants and cooperatives seeking independence\, and creators tired of surrendering revenue to plat forms. In **Goma**\, communities use be-BOP to organize resources and stab ilize local economies under pressure. Elsewhere\, artists use it to sustai n open culture without permission or lock-in.\n\nThe roadmap pushes beyond software. **Multitenant be-BOP** will enable domain-specific ecosystems — tailor-made for farmers’ markets\, repair collectives\, or independe nt venues — while **cross be-BOP** will link autonomous nodes into a fed eration of mutual visibility. Together they answer the twin failures of ce ntralized commerce: loss of agency and isolation.\n\nbe-BOP aspires to be more than a toolchain. It’s an experiment in rebuilding economic infrast ructure on open terms — a foundation for **free\, federated\, and sustai nable digital economies** that can’t be quietly “enshittified.”\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/be-bop-ethical-commerce-with out-the-middlemen END:VEVENT BEGIN:VEVENT SUMMARY:Applying cryptoanarchy in individual and communal sovereignty DTSTART:20251229T200000Z DTEND:20251229T203000Z UID:4d3e036a-e73c-5246-aa7a-a62ee609db12 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/applyi ng-cryptoanarchy-in-individual-and-communal-\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/applying-cryptoanarchy-in-in dividual-and-communal- END:VEVENT BEGIN:VEVENT SUMMARY:On the Limits of Decentralization DTSTART:20251229T203000Z DTEND:20251229T220000Z UID:ceb2263a-55db-5f72-9d48-ccc2088a1c9d CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/on-the -limits-of-decentralization\n\nDescription:\nIn its iterative\, by now fam iliar format\, the workshop opens with a short framing by the facilitator \, introducing the inquiry and reflecting on the asymmetry of facilitation itself and its relevance to decentralization. Participants then break int o smaller groups to explore the questions raised\, with room for divergenc e\, contestation and parallel lines of inquiry. The format remains intenti onally open to shifts in attention\, authority and coordination as the ses sion unfolds. We reconvene toward the end to share reflections\, tensions and unresolved questions rather than to converge on a single conclusion. T he workshop invites participants to engage not only with ideas of decentra lization but with how those ideas are enacted\, sustained or resisted in p ractice.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/on-the-limits-of-decentraliz ation END:VEVENT BEGIN:VEVENT SUMMARY:Welcome to the last CDC day DTSTART:20251230T092500Z DTEND:20251230T093000Z UID:8122fb96-8f4c-5a24-8d79-361e2ec1c83a CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/recap- and-precap-of-critical-decentralization_x3sg\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/recap-and-precap-of-critical -decentralization_x3sg END:VEVENT BEGIN:VEVENT SUMMARY:NextGraph Demo: Local First\, E2EE\, RDF graph DB\, and a Reactive ORM SDK DTSTART:20251230T093000Z DTEND:20251230T094500Z UID:7eb651d6-d6c2-5c72-be0c-6fd8caf919c6 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/nextgr aph-demo-local-first-e2ee-rdf-graph-db-and-a\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/nextgraph-demo-local-first-e 2ee-rdf-graph-db-and-a END:VEVENT BEGIN:VEVENT SUMMARY:SeedSigner DIY Bitcoin signing device build workshop DTSTART:20251230T094500Z DTEND:20251230T114500Z UID:c7c95f2a-039e-51d9-94f4-0212b6513fed CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/seedsi gner-diy-bitcoin-signing-device-build-w_312i\n\nDescription:\nSeedsigners are open-source DIY signing devices which can be built using "normal" hard ware like a Raspberry Pi and act as kind of hardware wallets to sign Bitco in transactions. Since the hardware is missing a secure element chip\, the keys are saved externally\, usually via self-drawn QR-codes which are rea d again for every use via the build-in camera.\n\nWe brought a few kits wi th us which we sell for 45€ and build together. We will lashing the firm ware on the MicroSD card and then build everything together in the 3d-prin ted enclosure.\n\nThe kit includes:\nRaspberry Pi Zero 1.3 (without Wifi o r Bluetooth chip)\, GPIO-header already soldered\nDisplay-Hat with joystic k and buttons\nCamera\n64GB MicroSD card\nMicroUSB to USB-C cable\n3D prin ted enclosure\n6 printed templates for self-drawn QR-Codes\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/seedsigner-diy-bitcoin-signi ng-device-build-w_312i END:VEVENT BEGIN:VEVENT SUMMARY:Whats new in Reticulum DTSTART:20251230T120000Z DTEND:20251230T123000Z UID:bdbd06d2-4e69-5bbe-9c6c-25bfd9982eaf CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/whats- new-in-reticulum\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/whats-new-in-reticulum END:VEVENT BEGIN:VEVENT SUMMARY:Solidarity Finance on P2P Rails DTSTART:20251230T123000Z DTEND:20251230T130000Z UID:edeb9f7b-30b5-5ed0-abf4-018af1ca6390 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/solida rity-finance-on-p2p-rails\n\nDescription:\nThis talk will last approximate ly 15 to 20 minutes followed by Q&A discussion for the rest of the time.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/solidarity-finance-on-p2p-ra ils END:VEVENT BEGIN:VEVENT SUMMARY:Who's afraid of anonymity? A philosophical and political toolkit DTSTART:20251230T130000Z DTEND:20251230T133000Z UID:5476150a-512d-564c-b2e3-527e5466d292 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/whos-a fraid-of-anonymity-a-philosophical-and-polit\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/whos-afraid-of-anonymity-a-p hilosophical-and-polit END:VEVENT BEGIN:VEVENT SUMMARY:Mutual Vend - decentralized coop vending machine DTSTART:20251230T133000Z DTEND:20251230T140000Z UID:ecaad706-f537-512b-8d73-f6a38b3afde6 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/mutual -vend-decentralized-coop-vending-machine\n\nDescription:\nCome learn about how digital ledgers and peer to peer vending machines challenge existing labor rights\, profit margins \, and finance legalities!\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/mutual-vend-decentralized-co op-vending-machine END:VEVENT BEGIN:VEVENT SUMMARY:Building the next web DTSTART:20251230T140000Z DTEND:20251230T143000Z UID:04907bec-c5fd-5ad9-b920-1e8ea83ba051 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/buildi ng-the-next-web\n\nDescription:\nLet’s figure out - what are the ingredi ents of the web evolution we all actually want? First - we look into the e volution we’ve had until now - in Decentralized communication\, AI\, XR \, Bitcoin\, & other forefront technologies that shape the internet as we know it. Then - we brainstorm - What are potential outcomes of our best & worst decisions there? They will shape how we build the next web.\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/building-the-next-web END:VEVENT BEGIN:VEVENT SUMMARY:Offworld Voyage @ 39c3: Astronaut Collectives Are Beautiful (A pro gress report) DTSTART:20251230T143000Z DTEND:20251230T150000Z UID:7eaee098-7ef3-530e-b2c2-9c30f6a9eeb2 CATEGORIES: DESCRIPTION:Full details: https://hub.test.c3voc.de/en/event/detail/offwor ld-voyage-39c3-astronaut-collectives-are-bea\n\nDescription:\n LOCATION:CDC Triangle URL:https://hub.test.c3voc.de/en/event/detail/offworld-voyage-39c3-astrona ut-collectives-are-bea END:VEVENT END:VCALENDAR