KrayChat | Zero-Knowledge Encrypted Messaging

🛡️ True Privacy by Design

No trust required. Verify everything.

🔑

Your Keys, Your Identity

Your Bitcoin address IS your chat identity. No phone numbers, no emails, no accounts. Just your Taproot key.

🔒

End-to-End Encryption

Messages are encrypted on your device before leaving. Only the recipient can decrypt. Even we can't read them.

💾

Local Storage Only

Messages are stored only on your device. Delete them and they're gone forever. No cloud backups.

🚫

Zero Metadata

We don't track who talks to whom, when, or how often. The relay only routes encrypted packets.

⚡

No Registration

Open the app, enter your password, start chatting. No sign-ups, no verification, no waiting.

🌐

Open Protocol

Built on standard Bitcoin cryptography (secp256k1, ECDH, AES-256-GCM). Auditable and transparent.

⚙️ How KrayChat Works

Simple for users, bulletproof under the hood.

1

Initialize Your Chat ID

Enter your wallet password. Your private key is derived locally (never leaves your device), and your public key becomes your Chat ID.

2

Share Your Chat ID

Give your Chat ID to anyone who wants to message you. It's safe to share - it's a public key, like a Bitcoin address.

3

Start a Conversation

Enter someone's Bitcoin address. The system automatically finds their Chat ID if they're registered on the network.

4

Messages are Encrypted Automatically

Using ECDH key exchange, a shared secret is created. Messages are encrypted with AES-256-GCM before sending.

5

Only Recipient Can Decrypt

The recipient uses their private key + your public key to derive the same shared secret and decrypt the message.

┌─────────────────────────────────────────────────────────────────────┐
│                    KRAYCHAT ENCRYPTION FLOW                        │
└─────────────────────────────────────────────────────────────────────┘

  YOUR DEVICE                  RELAY SERVER              THEIR DEVICE
  ────────────                  ────────────              ─────────────

  ┌─────────────┐                                        ┌─────────────┐
  │ Your Private│                                        │Their Private│
  │    Key      │                                        │    Key      │
  └──────┬──────┘                                        └──────┬──────┘
         │                                                      │
         │  + Their Public Key                  Your Public Key +
         │                                                      │
         ▼                                                      ▼
  ┌─────────────┐                                        ┌─────────────┐
  │   ECDH      │                                        │    ECDH     │
  │ Key Exchange│                                        │ Key Exchange│
  └──────┬──────┘                                        └──────┬──────┘
         │                                                      │
         ▼                                                      ▼
  ┌─────────────┐                                        ┌─────────────┐
  │  SAME       │                                        │   SAME      │
  │ Shared      │                                        │  Shared     │
  │ Secret      │                                        │  Secret     │
  └──────┬──────┘                                        └──────┬──────┘
         │                                                      │
  Message + Secret                                    Ciphertext + Secret
         │                                                      │
         ▼                                                      ▼
  ┌─────────────┐         ┌─────────────┐              ┌─────────────┐
  │ AES-256-GCM │────────▶│ Only sees   │─────────────▶│ AES-256-GCM │
  │  Encrypt    │         │ ciphertext │              │  Decrypt    │
  └─────────────┘         │ (garbage)  │              └─────────────┘
                          └─────────────┘
                          
  ╔═══════════════════════════════════════════════════════════════════╗
  ║  ❌ Server NEVER sees:                                           ║
  ║     • Your private key                                            ║
  ║     • The shared secret                                           ║
  ║     • The message content                                         ║
  ║                                                                   ║
  ║  ✅ Server ONLY sees:                                            ║
  ║     • Encrypted blob (ciphertext)                                 ║
  ║     • Public keys (to route messages)                             ║
  ╚═══════════════════════════════════════════════════════════════════╝

🔐 Security Guarantees

What we protect, and what we never touch.

✅ Private keys NEVER leave your device

✅ Messages encrypted before transmission

✅ Chat history stored only locally

✅ No account or registration required

❌ We CANNOT read your messages

❌ We CANNOT recover your Chat ID

❌ We CANNOT see who you talk to

❌ We CANNOT decrypt anything

📊 KrayChat vs Others

How we compare to other messaging apps.

Feature	KrayChat	WhatsApp	Telegram	Signal
End-to-End Encryption	✅ Always	✅ Default	❌ Optional	✅ Always
No Phone Number Required	✅	❌	❌	❌
No Account Registration	✅	❌	❌	❌
Messages Stored Locally Only	✅	❌	❌	✅
No Metadata Collection	✅	❌	❌	✅
Bitcoin-Native Identity	✅	❌	❌	❌
Open Source Protocol	✅	❌	Partial	✅

Ready for Real Privacy?

Start messaging with zero surveillance.

🚀 Launch KrayChat

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