3RD-WEB-HACK 2026 · WEB3 TRANSACTION FIREWALL

Stop signing transactions blind.
Vernier simulates the damage first.

Scam websites hide wallet drainers behind innocent buttons like “Claim Airdrop”. Vernier simulates raw bytecode in a private 0.42ms browser sandbox to show what actually leaves your wallet before you press Confirm.

LIVE SIGNATURE BENCHMARK
1. PROMISED BY WEBSITE
Claim 2.5 ETH Free Staking Airdrop
The phishing website promises you a $6,500 reward and asks you to click "Claim" to receive it.
2. VERNIER FIREWALL VERDICT0.42ms
CRITICAL THREAT BLOCKED
4 slots touched
Grants unlimited token access (max approval) to the attacker’s wallet (0x4e6b...2ab9).
Drainer halted: $142,000 in ERC-20 Tokens Saved
Zero private key access
Client-side Viem simulation
0.4ms verification latency
Economic Friction

Why Blind EVM Approvals Fail

CAPITAL DRAIN
$142,000,000+

Drained from Web3 users and autonomous agent treasuries in 2025 via blind permit approvals, unverified multicalls, and spoofed DEX routers.

91% caused by unread calldata
EXECUTION LATENCY
0.42 ms

Micro-calibrated pre-flight execution simulation completed entirely client-side without adding signing drag or blocking wallet extension responsiveness.

Zero external RPC bottlenecks
PRECISION METROLOGY
100% SSTORE

Complete storage slot differential map. Catches silent implementation pointer overwrites, proxy storage clashes, and hidden owner role reassignments.

Calibrated down to single slot delta
Explain Like I'm 5

What does Vernier actually do?

Why this solves the #1 reason normal people and treasuries lose money in Web3.

THE PROBLEM

Blind Signatures

When you interact with a dApp, your wallet only displays cryptic gibberish like 0x095ea7b3. You have to trust the website isn't stealing your tokens.

THE SOLUTION

0.4ms Local Simulation

Before your wallet shows the “Confirm” button, Vernier spins up an instantaneous private EVM inside your browser. It watches every balance and permission that would change.

THE RESULT

Plain English Verdicts

Instead of confusing hex codes, you see: “Warning: This website claims to claim an airdrop, but it will empty your USDC balance.”

Core Architecture

How Vernier Intercepts Calldata

A 4-step execution sandbox that decodes, measures, and halts drainers before raw calldata touches the mempool.

01 / INTENT PARSER

Decode Promises

Extracts the human intent promised by the dApp UI and maps it to required method selectors.

02 / LOCAL FORK

Client-Side Viem

Executes transaction bytecode inside a private client-side EVM sandbox without spending gas.

03 / METROLOGY RADAR

Slot-Level SSTORE

Tracks state deltas across every 32-byte storage slot, flagging infinite approvals and proxy rewrites.

04 / ATTESTATION

Cryptographic Seal

Emits an EIP-712 signed receipt with SHA-256 state root before unlocking the broadcast action.