Introduction

Kai-Sign is an open-source platform that revolutionizes blockchain transaction security through clear signing schema based on the ERC7730 standard. Instead of blindly approving cryptic bytecode, users can see exactly what they're signing in human-readable format.

The Problem: Blind Signing

When you interact with blockchain applications, you're typically asked to approve transactions that look like this:

0xa9059cbb000000000000000000000000a1371748d65baef4509a3c067b3fe3a1b79183ae000000000000000000000000000000000000000000000000000000001f143c37

This raw bytecode is impossible for humans to understand, forcing users to trust that the application is doing what it claims. This creates dangerous vulnerabilities:

Frontend Manipulation Attacks:

  1. A hacker injects malicious code into a script your wallet app uses

  2. When you click "send," the code intercepts the transaction data

  3. It rewrites key fields such as the recipient address or amount

  4. The altered transaction goes to your hardware wallet for signing

  5. Your browser still shows the original details, so you approve the malicious transaction

Because the final prompt appears in your browser and not on the secure device, you never see the changed values.

The Solution: Clear Signing with ERC7730

Clear signing transforms that cryptic bytecode into human-readable information directly on your hardware wallet:

Action: Transfer USDC
To: vitalik.eth
Amount: 100.00 USDC
Network: Ethereum Mainnet

How It Works

  1. Metadata Creation: Developers create ERC7730 metadata that maps transaction bytecode to human-readable labels

  2. Hardware Display: Your hardware wallet reads both the transaction data and metadata

  3. Clear Verification: You see exactly what the transaction will do before signing

  4. Secure Approval: You approve or reject based on clear, verifiable information

Security Benefits

  • Frontend Independence: Your hardware wallet becomes the single source of truth

  • Attack Prevention: Stops phishing, address poisoning, and frontend manipulation

  • Informed Decisions: See every detail of smart contract interactions

  • Trust Verification: No reliance on third-party interfaces

What Kai-Sign Does

Kai-Sign serves as a decentralized curator for ERC7730 metadata

Why It Matters

Clear signing represents a fundamental shift from trust-based to verification-based blockchain interactions. With Kai-Sign, you never have to blindly trust that an application is doing what it claims, you can see and verify every detail before signing.

This creates a safer, more transparent blockchain ecosystem where users maintain full control over their transactions while enjoying the benefits of complex DeFi protocols and smart contract interactions.

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