dchat（dchat 音频）

dchat — Decentralized P2P Messaging Skill

You have access to dchat, a decentralized peer-to-peer messaging system over the NKN relay network. Messages are end-to-end encrypted and require no centralized server, API keys, or accounts.

Wire-compatible with dchat Desktop and nMobile — bots can message human users and vice versa.

Commands

Run these commands using your shell execution tool. The dchat wrapper is in the skill directory at {baseDir}.

Identity (no network needed)

{baseDir}/dchat init                              # Generate bot identity (first time, auto-run at install)
{baseDir}/dchat address                           # Print bot's NKN address

Contacts (no network needed)

{baseDir}/dchat contacts add <address> <alias>    # Add a contact with alias
{baseDir}/dchat contacts remove <alias>           # Remove a contact
{baseDir}/dchat contacts list                     # List all contacts

Once a contact is added, use the alias instead of the 64-char address in send, history, and other commands.

Messaging (connects to NKN, ~5-8s per send)

{baseDir}/dchat send <address> Hello world!       # Send text message
{baseDir}/dchat send-image <address> ./photo.jpg  # Send image (encrypted, via IPFS)
{baseDir}/dchat send-audio <address> ./voice.aac  # Send audio file
{baseDir}/dchat send-file <address> ./report.pdf  # Send any file (encrypted, via IPFS)

Output on success: Connecting... then Sent: <message-id>. If the recipient is offline, the message is queued by NKN relay nodes for up to 1 hour.

Receiving

{baseDir}/dchat listen                            # Listen for messages (daemon, Ctrl+C to stop)

Output format:

[HH:MM:SS] <sender-prefix>...: <text>
[HH:MM:SS] <sender-prefix>...: [image] /path/to/downloaded.jpg
[HH:MM:SS] <sender-prefix>...: [audio] /path/to/downloaded.aac
[HH:MM:SS] <sender-prefix>...: [file: report.pdf] /path/to/downloaded.pdf

History (no network needed)

{baseDir}/dchat history <address>                 # Show last 50 messages with peer
{baseDir}/dchat history <address> 100             # Show last 100 messages

Interactive REPL

{baseDir}/dchat interactive                       # Full interactive mode with /send /file etc.

Options

{baseDir}/dchat --seed <64-char-hex> address      # Use specific seed
{baseDir}/dchat --data-dir /custom/path init      # Custom data directory

When to Use

Use this skill when the user or another agent wants to:

• Send or receive messages to/from another bot or NKN user
• Transfer files, images, or audio to a peer
• Set up a listening bot that reacts to incoming messages
• Check message history with a peer
• Get the bot's NKN address to share with others

Key Concepts

• NKN Address: 64-char hex public key. Each bot gets a unique address derived from its seed. Can be derived offline.
• Seed: 64-char hex Ed25519 private key. Auto-generated at install, saved encrypted to ~/.dchat-clawhub/identity.enc.
• Media: Encrypted with AES-128-GCM, uploaded to IPFS, key sent over NKN. Recipients auto-download and decrypt.
• History: All messages stored in SQLite at ~/.dchat-clawhub/messages.db.
• Receipts: Delivery and read receipts are automatic.

Security

• AES-128-GCM encryption for all media before IPFS upload
• Identity encrypted at rest (AES-256-GCM + PBKDF2, 100K iterations). Encryption key (.passkey) stored in separate OS config directory (~/.config/dchat-clawhub/) from the ciphertext (~/.dchat-clawhub/), both with file permissions 0600
• No centralized server — messages travel through NKN relay nodes
• SSRF protection: ad-hoc IPFS gateways from incoming messages are DNS-resolved and all IPs verified as public (rejects RFC 1918, loopback, link-local, ULA, IPv4-mapped IPv6)

Network & Storage

• Connects to NKN seed RPC servers (seed.nkn.org) for P2P relay
• Uploads/downloads encrypted media via public IPFS gateways (ipfs.io, dweb.link)
• Stores messages in local SQLite database (~/.dchat-clawhub/messages.db)
• Caches downloaded media in ~/.dchat-clawhub/media-cache/
• Install pulls 3 production npm packages: nkn-sdk, better-sqlite3, form-data

Limitations

• Each send takes ~5-8 seconds (NKN connect + 3s stabilization + relay dispatch)
• Offline messages held by NKN relay nodes for up to 1 hour
• Max file size: 100 MB
• Requires internet access to reach NKN seed nodes