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PairDrop

PairDrop cho phép chia sẻ tức thì hình ảnh, video, file PDF và đường link giữa những người ở gần nhau thông qua công nghệ Peer2Peer, mã nguồn mở, không cần cài đặt hay đăng ký.

PairDrop là công cụ chia sẻ file trực tiếp giữa người gần nhau mà không cần thiết lập hoặc đăng ký, giúp tiết kiệm thời gian và dữ liệu khi truyền tải nội dung lớn trong môi trường không kết nối mạng ổn định.

How should group chats work in decentralized systems?

Building group chats in a fully decentralized P2P messenger (Kiyeovo) requires navigating tradeoffs that centralized servers normally handle: membership authority, key distribution, message ordering, and offline delivery. The author evaluated several approaches — centralized coordination (Signal/Matrix), MLS/TreeKEM, leaderless membership, and fixed membership — before settling on a single-creator authority model. The creator holds exclusive rights to invite/kick members, identified by an Ed25519 key. Messages are encrypted with a per-epoch XChaCha20-Poly1305 symmetric key, rotated on membership changes. Group state lives in a DHT as a signed, hash-chained append-only log. Offline messages are stored in per-sender DHT buckets, and libp2p pub/sub topics are derived from the epoch key so removed members can't subscribe. Key tradeoffs include the creator being a single point of failure, no intra-epoch forward secrecy, and best-effort message ordering.

Zero-Latency Quizzing: How P2P Replication Solved the Conference Wi-Fi Problem

A developer built KahootP2P, an iOS quiz game that runs entirely over local peer-to-peer networking with no internet dependency. Using Couchbase Lite Enterprise's P2P replication and Bonjour for device discovery, the app solves the conference Wi-Fi bottleneck problem by keeping all data traffic local. The architecture models game state as Couchbase Lite documents — questions, answers, scores, and leaderboard — with bidirectional replication between a host device and player devices in a star topology. The post covers device discovery via Bonjour, scoring with the host's monotonic clock to avoid NTP dependency, reactive UI with Combine, and Codable integration for clean Swift model mapping. End-to-end latency from host action to player screen update is under 100ms on local Wi-Fi.

sneakerweb

Sneakerweb is a peer-to-peer web publishing protocol that requires no DNS servers, domain registrars, or web hosts. Websites are stored on user devices and shared via physical storage media using .snk files. A CLI tool lets users claim domains, publish static sites, import/export collections, and browse them locally in a standard browser. The protocol is built on top of Willow, which handles forgery prevention, data merging, and compact file formats.

Why Most People Give Up on Understanding Blockchain

A beginner-friendly explainer of blockchain fundamentals that addresses why most people disengage from learning the technology. Covers the core concepts of Distributed Ledger Technology, the difference between centralized and distributed systems, peer-to-peer architecture, consensus mechanisms (Proof of Work and Proof of Stake), immutability, and the role of cryptography in enabling trustless coordination. Uses Bitcoin as a concrete example throughout.