verified PROTOCOL SPECIFICATION MASTERCLASS schedule 12 MIN DEEP DIVE sync_alt TON CONNECT 2.0 PROTOCOL shield SESSION CRYPTOGRAPHY

TON Connect Protocol 2.0: Deep-Link DApp Authorization, Session Security, and Multi-Wallet Routing

TON Connect 2.0 serves as the universal cryptographic bridge between Telegram Web Apps (Mini-Apps), standalone web DApps, and TON wallets (TON Space, Tonkeeper, MyTonWallet, and OpenMask). Rather than granting web applications direct access to user credentials or private keys, TON Connect enforces an asynchronous, end-to-end encrypted session model. This guide breaks down manifest verification, ECDSA curve handshakes, payload simulation, and proactive defense against blind-signing exploits.

Zero Private Key

Application Exposure

ECDSA / Curve25519

Session Encryption Key

Manifest JSON

Same-Origin Domain Verification

1-Tap Kill

Session Revocation Protocol

lan 1. The 4-Tier TON Connect 2.0 Architecture

When a user clicks "Connect TON Wallet" inside a Telegram Mini-App or on an external decentralized exchange, a strict multi-layer handshake initiates to guarantee origin integrity.

description

Manifest Verification (tonconnect-manifest.json)

The wallet fetches the dApp's manifest directly from its root domain via HTTPS. It strictly checks that the domain hosting the application matches the manifest URL, preventing phishing impersonations and rogue iframe injections.

vpn_key

Ephemeral Session Key Exchange

The wallet and the dApp generate an ephemeral session key pair using Diffie-Hellman key exchange (X25519). All subsequent communication (transaction requests, balance queries) is encrypted end-to-end through a secure bridge server.

visibility

Human-Readable Simulation

Prior to authorizing any transfer or smart contract execution, TON Space decodes the Boc (Bag of Cells) payload. It presents human-readable details: destination address, exact TON amount, and maximum gas fee limit.

terminal 2. Interactive TON Connect Session Inspector

Simulate a live TON Connect 2.0 handshake between a Telegram Mini-App and your TON Space wallet. Inspect the cryptographic payload and test session termination.

Session Handshake Inspector

Live bridge simulation between client WebApp and wallet enclave.

link_off DISCONNECTED

dApp Authorization Controls

Origin: https://app.dedust.io/tonconnect-manifest.json

Session Payload Stream

// Awaiting TON Connect initiation... { "status": "idle", "protocol_version": 2, "session_token": null }

security 3. Anti-Phishing & Blind-Signing Mitigation

Malicious actors often attempt to exploit user trust by prompting ambiguous transactions with deceptive comments. TON Connect 2.0 incorporates built-in defense heuristics.

verified_user Never Approve Opaque BoC Payloads

If a TON Connect prompt does not clearly display the destination contract name and exact token amount, reject the prompt immediately. Legitimate Telegram Mini-Apps publish human-readable ABI manifests that allow TON Space to decompose the transaction payload before you sign.

EXECUTIVE BLUEPRINT

One-Page Technical Summary Infographic

Click the poster below to inspect the complete 4-tier security schema: manifest domain hash verification, cryptographic ECDSA handshake exchange, in-app transaction simulation with gas guards, and instant session revocation switches.

TON Connect 2.0 Protocol & Security Architecture Blueprint

zoom_in Click to Enlarge

task_alt 4. TON Connect Security Rules

Origin Isolation: Always verify that the connecting Mini-App matches the official Telegram bot handle.
Periodic Hygiene: Routinely inspect your active TON Connect sessions in Settings and disconnect idle dApps.
Zero Blind Signing: Verify transaction gas costs and destination addresses on every confirmation screen.
Permission Scoping: TON Connect cannot extract funds automatically without explicit user authorization per transaction.

auto_stories Related Web3 Masterclasses

TON Wallet