StarkNet Architecture

What Makes StarkNet Different

StarkNet is a ZK rollup from Starkware, launched in alpha 2021 and mainnet in November 2021. Unlike zkSync Era (which compiles Solidity), StarkNet uses its own language and VM: Cairo. This was a deliberate choice — Cairo is purpose-built to be efficient inside STARK proofs, producing dramatically faster proving than EVM-based ZK systems. The cost: developers can't just port Solidity contracts; they have to rewrite in Cairo. The benefit: throughput, proving speed, and architectural cleanness.

Cairo as a Language

Cairo (now Cairo 1.0+) is a Rust-flavoured smart contract language. It's not EVM-compatible — there's no Solidity bridge. Instead, it's designed to translate efficiently into the polynomials a STARK prover needs. Cairo has native account abstraction (every account is a contract), no EOAs, generic associated types, traits, pattern matching, and explicit immutability. Many developers describe it as 'feels modern' compared to Solidity's Ethereum-era constraints.

STARK Proofs at the Core

StarkNet uses STARK proofs end-to-end — no SNARK wrapping like zkSync. STARK proofs are larger (~50-200 KB vs SNARK's ~500 bytes) but require no trusted setup and are post-quantum secure. The larger proof size translates to higher on-chain verification cost on Ethereum — a real trade-off that affects sequencer economics. Starkware's argument: the trusted-setup-free guarantee and quantum resistance are worth it for long-lived infrastructure.

• Custom VM (Cairo) instead of EVM — better for proving, worse for porting
• Native account abstraction throughout
• STARK proofs end-to-end — no trusted setup, post-quantum secure
• Larger proofs = higher L1 verification cost, but transparent + quantum-resistant