Source @EdgeOfSource

I’m hiring backend / protocol engineers to build a new product in the Penumbra codebase DMs are open if you understand these systems like this / namada

erwan 🌘 @erwanor

2 weeks ago

I’m hiring backend / protocol engineers to build a new product in the Penumbra codebase DMs are open if you understand these systems like this / namada

17 20 217 72K 10

Download Image

📚 System Design: Proxy Re-Encryption **Problem:** Share encrypted data without exposing content **Solution:** Proxy Re-Encryption - Alice encrypts data with her key - Proxy converts to Bob's key format - Bob decrypts with his key - Proxy never sees plaintext Used in secure…

🌐 Tech Philosophy: Edge-First Computing - **Cloud-First**: Send data to distant servers - **Edge-First**: Process data where it's created **Advantages**: - Lower latency (faster responses) - Better privacy (data stays local) - Offline capability - Reduced bandwidth costs The…

💡 Concept Explained: Threshold Cryptography Instead of "1 key = 1 signature," threshold crypto uses an M-of-N scheme: - Split key into N shares - Any M shares can create a signature - Individual shares are useless alone This increases security and fault tolerance. Example: A…

🔬 Algorithm Spotlight: Merkle DAGs - DAG = Directed Acyclic Graph (like a family tree, no loops) **Merkle DAG benefits:** - Each node has a cryptographic hash - Changes create new hashes (tamper evidence) - Efficient verification of large datasets - Used in Git, IPFS, and…

📖 Tech Tutorial: Distributed Key Generation (DKG) Traditional crypto: 1 private key = 1 point of failure DKG approach: - Multiple parties collaborate - Generate key shares (no one has full key) - Threshold operations (e.g., 3 of 5 needed) - Reconstruct signatures collectively…

🧠 Deep Dive: Zero Knowledge Proofs ZK Proof = Prove you know something without revealing what you know Real examples: - 🔐 Prove you're over 18 without showing your birthdate - 🔐 Prove you have funds without revealing your balance - 🔐 Prove identity without exposing personal…

🎓 Learning Corner: Content-Addressable Data Traditional web: "Where is the data?" (URLs point to locations) Content-addressable: "What is the data?" (Hash identifies content) Benefits: - ✅ Data integrity verification - ✅ Deduplication - ✅ Decentralized storage - ✅ No…

🧠 @googledevs' Gemma 3 270M shows the future: specialized #AI models for specific tasks. While they're solving deployment at scale, Source is solving the data layer: ✅ Edge-first data management for local AI ✅ Decentralized model versioning with DefraDB ✅ Privacy-preserving…

📚 Tech Education: What are CRDTs? CRDT = Conflict-free Replicated Data Type Think Google Docs collaboration, but for databases: - Multiple users edit simultaneously - No "merge conflicts" or data loss - Mathematical guarantees of consistency - Works offline, syncs when…

My database is so eventually consistent that by the time it converges, I'll have already retired and started a goat farm 🐐

Zero Knowledge Proofs: "I can prove I know something without telling you what it is!" My imposter syndrome: "Finally, a cryptographic protocol that gets me." 🤐

My code is like a fine wine: it gets better with age, but mostly, it just gives me headaches. 🍷🤕

My distributed system is so distributed that I need a distributed system to find my distributed system. 🤔

Building collaborative features shouldn't require a PhD in distributed systems. DefraDB makes it simple: ✅ Real-time collaboration built-in ✅ Offline editing with perfect sync ✅ No conflict resolution logic needed ✅ Works with any data structure Explore real examples and…