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제가 開發하고 있는 프로젝트 Hackers' Pub의 베타 테스터를 모십니다!
이 프로젝트는 #聯合宇宙(fediverse)板 velog 같은 것으로, 소프트웨어 開發者를 爲한 #ActivityPub 基盤의 SNS 兼 블로그 플랫폼입니다. AGPL-3.0 라이선스로 소스 코드가 公開되어 있을 뿐 아니라, GitHub에서 프로젝트를 公開的으로 進行하고 있습니다.
職業으로든 趣味로든 소프트웨어를 開發하시는 분들, 聯合宇宙를 좋아하시는 분들, 새로운 플랫폼을 써 보고 싶으신 분들은 부디 參與해 주시기 바랍니다! 關心 있으신 분들은 答글이나 DM으로 이메일 住所를 보내주시면 됩니다.
hackers.pubHackers' PubHackers' Pubは、ソフトウェアエンジニアが知識と経験を共有する場所です。また、ActivityPubに対応したソーシャルネットワークでもあり、フェディバース（fediverse）で気に入ったハッカーをフォローして、最新の投稿をフィードで受け取ることができます。
拡散希望：開発中のプロジェクトHackers' Pubの日本語ベータテスターを募集します！
これはフェディバース版のQiita/Zennを目指す、ActivityPub基盤の開発者向けSNS兼ブログプラットフォームです。AGPL-3.0ライセンスでソースコードを公開しており、GitHubでプロジェクトも公開進行中です。
現在韓国語話者中心に招待制ベータテスト中ですが、日本の開発者コミュニティにも広げたいと思っています。ソフトウェア開発に興味がある方、フェディバースが好きな方、新しいプラットフォームを試してみたい方、ぜひご参加ください！興味のある方はリプライかDMでメールアドレスをお送りください。
hackers.pubHackers' PubHackers' Pubは、ソフトウェアエンジニアが知識と経験を共有する場所です。また、ActivityPubに対応したソーシャルネットワークでもあり、フェディバース（fediverse）で気に入ったハッカーをフォローして、最新の投稿をフィードで受け取ることができます。
Just published a post about Hackers' Pub's unique username change policy! Unlike most #fediverse platforms, they allow a one-time username change while preserving your connections and content history. It's all possible thanks to some clever #ActivityPub implementation using UUID-based actor URIs instead of username-based ones. If you're interested in trying it out, the platform is currently in invitation-only beta—check the post for details on how to request access!
https://hackers.pub/@hongminhee/2025/hackers-pub-introduces-flexible-username-changes
hackers.pub · Hackers' Pub Introduces Flexible Username Changes: Breaking the Fediverse NormHackers' Pub is a community-focused platform where programmers and technology enthusiasts share knowledge and experiences. As an ActivityPub-enabled social network, it allows users to connect with others across the broader fediverse ecosystem, bringing technical discussions and insights directly to followers' feeds.
In the fediverse landscape, your username is typically set in stone once chosen. Most ActivityPub-powered platforms like Mastodon, Pleroma, and others enforce this permanence as a fundamental design principle. However, Hackers' Pub is charting a different course with a more flexible approach to digital identity.
One-Time Username Change: Freedom with Responsibility
Unlike most fediverse platforms, Hackers' Pub now allows users to change their username (the part before the @ in your Fediverse handle) exactly once during the lifetime of their account. This policy acknowledges that people grow, interests evolve, and the username that seemed perfect when you joined might not represent who you are today.
This one-time change limit strikes a careful balance—offering flexibility while maintaining the stability and reliability that's essential for a federated network.
Username Recycling: New Opportunities
When you change your username on Hackers' Pub, your previous username becomes available for other users to claim. This recycling mechanism creates new opportunities for meaningful usernames to find their most fitting owners, rather than remaining permanently locked to accounts that no longer use them.
For newcomers to the platform, this means a wider selection of desirable usernames might become available over time—something virtually unheard of in the traditional fediverse ecosystem.
Link Preservation: Maintaining Digital History
Worried about broken links after changing your username? Hackers' Pub has implemented a thoughtful solution. All permalinks containing your original username will continue to function until someone else claims that username. This approach helps preserve the web of connections and conversations that make the fediverse valuable.
This temporary preservation period gives your connections time to adjust to your new identity while preventing immediate link rot across the federation.
The Technical Foundation: ActivityPub Actor URIs
What enables Hackers' Pub to offer username changes while other fediverse platforms can't? The answer lies in how actor identities are implemented at the protocol level.
Hackers' Pub uses UUID-based actor URIs that don't contain the username. For example, a user with handle @hongminhee has an underlying ActivityPub actor URI that looks like https://hackers.pub/ap/actors/019382d3-63d7-7cf7-86e8-91e2551c306c. Since the username isn't part of this permanent identifier, it can be changed without breaking federation connections.
This contrasts sharply with platforms like Mastodon, where a user @hongminhee has an actor URI of https://mastodon.social/users/hongminhee. With the username embedded directly in the URI, changing it would break all federation connections, which is why these platforms don't allow username changes.
This architectural choice gives Hackers' Pub the technical flexibility to implement username changes while maintaining account continuity across the fediverse.
GitHub-Inspired Approach
Those familiar with GitHub might recognize this model—Hackers' Pub has adapted GitHub's username change policy for the fediverse context. This approach brings the best of both worlds: the option for identity evolution from centralized platforms and the federation benefits of the fediverse.
What This Means for Users
For Hackers' Pub users, this policy offers a significant advantage over other fediverse instances:
You can correct an unfortunate username choice
Your online identity can evolve as you do
Your content history remains intact during the transition
You maintain your social connections despite the change
The Future of Fediverse Identity
Hackers' Pub's username policy represents an interesting experiment in the fediverse—testing whether more flexible identity management can coexist with the stability needed for federation. If successful, we might see other platforms adopt similar approaches, creating a more adaptable yet still interconnected social web.
For now, users should consider this policy a compelling reason to choose Hackers' Pub as their fediverse home, especially if username flexibility matters to their online experience.
Hackers' Pub is currently in invitation-only beta. If you're interested in trying out the platform and its unique username policy, please leave your email address in the comments below. We'll add you to the allowlist, enabling you to sign up directly on the website. Note that this doesn't involve sending invitation emails—your address will simply be approved for registration when you visit the signup page.
Hackers' Pub Introduces Flexible Username Changes: Breaking the Fediverse Norm
https://hackers.pub/@hongminhee/2025/hackers-pub-introduces-flexible-username-changes
hackers.pub · Hackers' Pub Introduces Flexible Username Changes: Breaking the Fediverse NormHackers' Pub is a community-focused platform where programmers and technology enthusiasts share knowledge and experiences. As an ActivityPub-enabled social network, it allows users to connect with others across the broader fediverse ecosystem, bringing technical discussions and insights directly to followers' feeds.
In the fediverse landscape, your username is typically set in stone once chosen. Most ActivityPub-powered platforms like Mastodon, Pleroma, and others enforce this permanence as a fundamental design principle. However, Hackers' Pub is charting a different course with a more flexible approach to digital identity.
One-Time Username Change: Freedom with Responsibility
Unlike most fediverse platforms, Hackers' Pub now allows users to change their username (the part before the @ in your Fediverse handle) exactly once during the lifetime of their account. This policy acknowledges that people grow, interests evolve, and the username that seemed perfect when you joined might not represent who you are today.
This one-time change limit strikes a careful balance—offering flexibility while maintaining the stability and reliability that's essential for a federated network.
Username Recycling: New Opportunities
When you change your username on Hackers' Pub, your previous username becomes available for other users to claim. This recycling mechanism creates new opportunities for meaningful usernames to find their most fitting owners, rather than remaining permanently locked to accounts that no longer use them.
For newcomers to the platform, this means a wider selection of desirable usernames might become available over time—something virtually unheard of in the traditional fediverse ecosystem.
Link Preservation: Maintaining Digital History
Worried about broken links after changing your username? Hackers' Pub has implemented a thoughtful solution. All permalinks containing your original username will continue to function until someone else claims that username. This approach helps preserve the web of connections and conversations that make the fediverse valuable.
This temporary preservation period gives your connections time to adjust to your new identity while preventing immediate link rot across the federation.
The Technical Foundation: ActivityPub Actor URIs
What enables Hackers' Pub to offer username changes while other fediverse platforms can't? The answer lies in how actor identities are implemented at the protocol level.
Hackers' Pub uses UUID-based actor URIs that don't contain the username. For example, a user with handle @hongminhee has an underlying ActivityPub actor URI that looks like https://hackers.pub/ap/actors/019382d3-63d7-7cf7-86e8-91e2551c306c. Since the username isn't part of this permanent identifier, it can be changed without breaking federation connections.
This contrasts sharply with platforms like Mastodon, where a user @hongminhee has an actor URI of https://mastodon.social/users/hongminhee. With the username embedded directly in the URI, changing it would break all federation connections, which is why these platforms don't allow username changes.
This architectural choice gives Hackers' Pub the technical flexibility to implement username changes while maintaining account continuity across the fediverse.
GitHub-Inspired Approach
Those familiar with GitHub might recognize this model—Hackers' Pub has adapted GitHub's username change policy for the fediverse context. This approach brings the best of both worlds: the option for identity evolution from centralized platforms and the federation benefits of the fediverse.
What This Means for Users
For Hackers' Pub users, this policy offers a significant advantage over other fediverse instances:
You can correct an unfortunate username choice
Your online identity can evolve as you do
Your content history remains intact during the transition
You maintain your social connections despite the change
The Future of Fediverse Identity
Hackers' Pub's username policy represents an interesting experiment in the fediverse—testing whether more flexible identity management can coexist with the stability needed for federation. If successful, we might see other platforms adopt similar approaches, creating a more adaptable yet still interconnected social web.
For now, users should consider this policy a compelling reason to choose Hackers' Pub as their fediverse home, especially if username flexibility matters to their online experience.
Hackers' Pub is currently in invitation-only beta. If you're interested in trying out the platform and its unique username policy, please leave your email address in the comments below. We'll add you to the allowlist, enabling you to sign up directly on the website. Note that this doesn't involve sending invitation emails—your address will simply be approved for registration when you visit the signup page.