Smart Contract

Definition

A smart contract is self-executing code stored on a blockchain that automatically enforces agreement terms when conditions are met. Smart contracts enable DeFi, NFTs, DAOs, and other decentralized applications. Quantum-resistant smart contracts use post-quantum cryptography for all signature verification.

Technical Explanation

Smart contracts contain logic executing on the blockchain virtual machine. They store state, receive transactions, validate conditions, and transfer assets automatically. Security depends on both code correctness and underlying cryptographic primitives.

Quantum vulnerability: smart contracts verifying ECDSA signatures become bypassable with quantum key derivation. Attackers forge "valid" signatures for any address. Post-quantum smart contracts verify SPHINCS+ signatures, maintaining security against quantum attackers.

SynX Relevance

SynX smart contracts use SPHINCS+ signature verification natively. All contract interactions—token transfers, DeFi operations, governance votes—are authorized by quantum-resistant signatures. This protects smart contract logic from quantum-enabled bypass attacks.

Frequently Asked Questions

Can existing smart contracts be made quantum-resistant?: Contracts on quantum-vulnerable chains cannot—they must migrate to quantum-resistant platforms.
Are smart contracts slower with post-quantum crypto?: Signature verification takes marginally longer; practical impact is minimal for typical operations.
What languages support quantum-resistant contracts?: The blockchain platform determines support—SynX smart contracts use quantum-resistant verification internally.

Quantum-secure programmable money. Build on SynX