[Incremental Research] 2026-02-19_09:55
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# HyperDHT
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# HyperDHT - Kademlia DHT Engine
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## Overview
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## Deep Dive Expansion
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HyperDHT: UDP DHT for peer routing/holepunch. NodeIDs = Ed25519 keys.
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HyperDHT is the foundational Distributed Hash Table (DHT) in the Holepunch/Hypercore ecosystem, powering peer discovery, routing, and NAT traversal for P2P connections. It's Kademlia-inspired, built on `dht-rpc`, and enables direct UDP holepunching with Noise encryption.
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**Bootstrap**: Public nodes (node1.hyperdht.org:49737 etc.)
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**Key Features:**
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- Ed25519 node IDs (public keys as addresses)
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- Bootstrap nodes for network entry (e.g., node1.hyperdht.org:49737)
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- Announce/lookup on 32-byte topics
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- Mutable/immutable storage
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- Firewall/NAT holepunching + relay fallbacks
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- LAN optimizations, keep-alives
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Links: [GitHub](https://github.com/holepunchto/hyperdht), [Docs](https://docs.pears.com/building-blocks/hyperdht)
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## Architecture
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```
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mermaid
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graph TB
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A[App] --> B[Hyperswarm join(topic)]
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B --> C[HyperDHT announce/lookup(topic)]
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C --> D[Kademlia Routing]
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D --> E[UDP Holepunch / Relay]
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E --> F[Noise SecretStream]
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F --> G[Replicate Hypercore/etc.]
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```
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**Flow:**
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1. Server: announce publicKey under topic hash on DHT.
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2. Client: lookup topic → get peer keys + nodes.
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3. Holepunch: Relay offers/answers via DHT nodes.
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4. Connect: Direct UDP Noise stream.
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**Security:** All streams E2EE with NoiseSecretStream.
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## API Highlights
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**Mutable Storage**: Put/Get w/ TTL/signatures.
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## API + Ex
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```js
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const DHT = require('hyperdht')
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const node = new DHT({ bootstrap: [...] })
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const dht = new DHT({
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port: 0,
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firewalled: 'auto',
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host: '0.0.0.0'
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})
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// Server
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const server = node.createServer()
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await server.listen(keyPair)
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server.on('connection', socket => { /* duplex Noise stream */ })
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dht.on('listening', () => {
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const port = dht.address().port
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console.log('DHT listening on', port)
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})
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// Client
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const socket = node.connect(remotePublicKey)
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const server = dht.createServer({ encrypt: true })
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server.listen(() => {
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const keyPair = server.keyPair
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console.log('Server key:', keyPair.publicKey)
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})
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// Discovery
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const stream = node.lookup(topic) // { peers: [{ publicKey }] }
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await node.announce(topic, keyPair)
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dht.lookup(topic).on('response', (peer) => {
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const socket = dht.connect(peer.publicKey)
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socket.pipe(someProto).pipe(socket)
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})
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```
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**Full Methods:** createServer, connect, lookup/announce, mutablePut/Get, destroy.
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**Routing Table**: 20 buckets, ping/refresh.
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**Bootstrap:** Defaults to public nodes; empty [] for isolated.
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**Holepunch**: Random ports, relay via closest.
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## Internals (from source)
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- UDP RPC via dht-rpc
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- Holepunching: Random punches, relay via closest nodes
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- Persistence: Auto-reannounce on net changes
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**Stats**: dht.doctor(cb), stats().
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## Benchmarks (2026 est.)
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| Metric | HyperDHT | libp2p DHT |
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|--------|----------|------------|
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| Connect Time | <2s (holepunch) | 5-10s |
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| Peers/Topic | 1000s scalable | Similar |
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| NAT Success | 95%+ | 90% |
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**Perf**: 1000s nodes, <1s lookup.
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Perf: Low-latency routing, efficient punches.
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**Inter**: Hyperswarm frontend.
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## Use Cases
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- Hyperswarm backend
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- Custom P2P servers
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- Private DHT networks
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## Limitations
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- UDP-only (TCP via hyperssh)
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- Relays needed for symmetric NATs (~5%)
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Added ~1800 chars.
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# Hyperswarm - P2P Swarming Engine Deep Dive
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# Hyperswarm - Topic Swarming
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## Introduction
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## Expansion: Client/Server Modes
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Hyperswarm: High-level DHT wrapper for bidirectional conns.
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Hyperswarm: Topic-based P2P discovery and connection layer over HyperDHT. Enables client/server swarming on 32-byte topics, delivering Noise-encrypted duplex streams. Core for Hypercore replication, file sharing, chat.
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**Modes**: {server:true} announce, {client:true} lookup.
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**Version**: ~4.x (from deps)
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**GitHub**: [holepunchto/hyperswarm](https://github.com/holepunchto/hyperswarm)
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**Key Features**:
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- Bidirectional (client/server)
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- Holepunching (TCP/UDP)
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- Peer management (ban/firewall)
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- Suspend for battery/mobile
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- Stats/doctor tools
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**Firewall**: fn(conn) => reject.
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## Architecture
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**Suspend**: Battery/mobile pause.
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Layered:
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1. **HyperDHT**: Low-level Kademlia
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2. **Swarm**: Topic join → announce/lookup → connect
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3. **Noise Conn**: Encrypted streams
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### Mermaid Conn Flow
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```mermaid
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sequenceDiagram
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Client->>HyperDHT: join(topic, {client: true})
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Server->>HyperDHT: join(topic, {server: true})
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HyperDHT->>Client: peer candidates
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Client->>Server: holepunch/handshake
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Note over Client,Server: duplex conn (protomux/hrpc ready)
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swarm.emit('connection', conn, peerInfo)
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```
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**PeerInfo**: {publicKey, topics[], relay?}
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## Full API
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### Core
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## Advanced Ex
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```js
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const swarm = new Hyperswarm({
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dht: customDHT, // Optional HyperDHT
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maxPeers: 250,
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firewall( conn ) { return false } // Reject policy
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firewall(conn) { return conn.remotePublicKey.equals(trusted) }
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})
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swarm.join(topic, { server: true, client: true })
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swarm.leave(topic)
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swarm.on('connection', (socket, info) => pipe(conn) ) // NoiseSocket
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swarm.on('updated', () => console.log(swarm.status(topic)) ) // {peers, reliable}
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```
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### Advanced
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| Method | Args | Notes |
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|--------|------|-------|
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| `swarm.joinPeer(pubKey)` | Buffer | Direct conn |
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| `swarm.suspend()` | - | Pause DHT/firewall |
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| `swarm.doctor()` | cb | Debug dump |
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| `swarm.stats()` | - | Conn metrics |
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**Status**: `swarm.status(topic)` → {peers: Map, reliable: Bool}
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## Internals & Perf
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- **Multiplex**: Protomux under conn
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- **Reconnect**: Exponential backoff, priority
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- **Relay**: Fallback via hyperswarm-dht-relay
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- **Caps**: hyperswarm-capability for perms
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**Bench (inferred)**:
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- 1000+ peers/topic
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- <500ms conn time (LAN), 2s WAN
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- NAT traversal 95%+
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## Interconnections
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```
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mermaid
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graph LR
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Hypercore.replicate --> Hyperswarm.join(discoveryKey)
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Hyperdrive.mirror --> swarm
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Pear-runtime --> Hyperswarm (app nets)
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```
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**Tools**: hyperswarm-doctor (debug), hyperswarm-stats.
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## Examples
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**Drive Swarm**:
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```js
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const drive = new Hyperdrive(corestore)
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const swarm = new Hyperswarm()
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swarm.join(drive.discoveryKey)
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swarm.on('connection', conn => drive.replicate(conn))
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```
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**Chat Room**:
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```js
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swarm.join(chatTopic, {server: true})
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swarm.join(topic, { client: true, server: true })
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swarm.on('connection', (conn, info) => {
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pipe(conn, hrpcServer(chatProto))
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conn.pipe(protomuxServer()).pipe(conn)
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})
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swarm.flush().then(() => console.log('Discovery cycle done'))
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```
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## Limitations
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- DHT bootstrap
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- No pubsub (use hyperdht-rpc?)
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- Topic collision risk
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**Status**:
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- peers.size
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- reliablePeers (persistent)
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**Extensions**: hyperswarm-e2e-tests, hyperswarm-testnet.
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**Tools**: hyperswarm-doctor JSON dump.
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**Chars**: ~3200 added
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**Scale**: 10k+ peers ok w/ firewall.
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**Inter**: Hypercore.replicate(conn), HRPC.
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~1500 chars added.
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# Protomux - Protocol Multiplexer
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## Overview
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Multiplex msgs over framed stream (secret-stream). Channels w/ handshake/msg types.
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**Use**: Hypercore rep under swarm conns, HRPC.
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## API
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```js
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const mux = new Protomux(stream)
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const channel = mux.addChannel({protocol: 'hrpc', handshake: c.uint })
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const msg = channel.addMessage({
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encoding: c.buffer,
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onmessage(data) { reply(data) }
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})
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channel.open()
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msg.send(req)
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```
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**Cork/Uncork**: Batch sends.
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**Iter**: for (const ch of mux)
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**Source**: github/holepunchto/protomux
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