8.3 Quantum-resistant Wallet

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Quantum-Resistant Wallet and zk-Bridge

Introduction

As blockchain infrastructure evolves, two critical needs have emerged: resilience against future quantum threats and private cross-chain interoperability. BitNet introduces two foundational components to address these:

• Quantum-Resistant Wallets — designed with 512-bit cryptography, Account Abstraction (ERC-4337), programmable gas sponsorship, and key rotation.

• zk-Bridges — enabling secure, unlinkable cross-chain asset transfers using zero-knowledge proofs (zk-SNARKs) without trusted intermediaries.

These systems enhance BitNet’s usability, security, and future readiness across DeFi, NFTs, and institutional applications.

Quantum-Resistant Wallet

Overview

To future-proof user security, BitNet integrates a smart contract wallet architecture using 512-bit cryptographic key pairs instead of traditional 256-bit elliptic curves. This shift offers post-quantum safety, programmable execution, and gas fee abstraction.

Architecture and Design

1. Longer-Key Signature System

• Private Key: 512 bits, non-custodially held.

• Public Key: Stored in the smart contract wallet and used for signature validation.

• Signature Verification: Custom logic verifies 512-bit signatures on-chain.

Key Advantages:

Feature	Traditional Wallet (EOA)	BitNet Quantum Wallet
Key Size	256 bits	512 bits
Quantum Resistance	❌	✅
Signature Format	ECDSA	Custom (quantum-safe)
Key Rotation	❌	✅
Smart Contract Integration	❌	✅

2. Cryptographic Strength

• ECC entropy: 2²⁵⁶

• 512-bit entropy: 2⁵¹²

• Resistant to Grover’s and Shor’s algorithms.

3. Smart Contract Enforcement

• Wallet contract stores the 512-bit public key.

• Validates long-signature data using on-chain logic or precompiled circuits.

• Enables optional key rotation per transaction via hash chains or Merkle trees.

Account Abstraction and Gas Sponsorship

BitNet wallets are fully compatible with ERC-4337, allowing:

• Custom signature validation logic via validateUserOp().

• Paymaster contracts to sponsor gas (e.g., free DEX swaps, onboarding bonuses).

• Modular features like 2FA, IP restrictions, and session keys.

Benefits Summary:

Feature	Standard EOA	BitNet Wallet
Long-Key Support	❌	✅
User Pays Gas	✅	❌ (if sponsored)
Bundled Transactions	❌	✅
Custom Logic (2FA, rotation)	❌	✅

Use Cases

Quantum-Resistant Institutional Wallets

• High-assurance storage for large-value assets.

• Smart contract-based access controls and auditing.

Gasless DeFi Onboarding

• Users can interact with dApps without needing BNC for gas.

• Useful for first-time users or promotional campaigns.

Roadmap

1. SDKs & Plug-ins

   • MetaMask Snaps and WalletConnect-compatible integrations.

   • Mobile secure enclave support (iOS/Android).

2. Composable Account Abstraction Standards

   • Modular signature validators.

   • Execution hooks (e.g., logging, key rotation).

3. Governance & Ecosystem

   • Propose EIPs for signature formats.

   • Form working groups for standards and audits.