Sui

Sui is a high-throughput, low-latency Layer 1 blockchain built by Mysten Labs, a team of engineers and researchers who previously built the Diem (Libra) and Novi projects at Meta. It launched its mainnet in May 2023. Sui’s defining bet is that the account-and-balance model used by Ethereum and most other chains is the wrong primitive for scaling: instead, Sui represents all on-chain state as discrete, typed objects, which lets independent transactions execute in parallel rather than single-file.

That object model is paired with the Move language — a resource-oriented language, also created at Meta, in which on-chain assets are first-class values the type system refuses to copy or silently drop. Sui shares this Move/object lineage with IOTA, which rebased its own mainnet onto the same Mysten Labs research stack in 2025. If you know one, much of the other will feel familiar.

Why Sui Is Different#

Three design choices distinguish Sui from EVM chains, and most of the rest of this section elaborates on them:

  • The object model. State is a graph of owned, shared, and immutable objects rather than a flat map of account balances. Ownership is explicit and tracked by the protocol.
  • Parallel execution. Transactions that touch disjoint sets of objects never contend, so the network scales with available hardware instead of being bottlenecked by a global lock. Transactions touching only owned objects skip consensus entirely via a “fast path.”
  • Move as the contract language. Assets are typed resources with linear semantics, eliminating whole classes of bugs (reentrancy, accidental loss) that plague Solidity.

On top of these, Sui adds developer- and user-facing primitives that have no clean Ethereum equivalent: Programmable Transaction Blocks (compose many actions atomically in one transaction) and zkLogin (derive a wallet from a Web2 OAuth login, no seed phrase).

Consensus at a Glance#

Sui uses Mysticeti, a DAG-based Byzantine-fault-tolerant consensus protocol, with proof-of-stake validator selection. The Mysticeti v2 upgrade (rolled out from late 2025) folds transaction validation into consensus and, on Mysten’s benchmarks, sustains ~100,000 transactions per second at roughly 390 ms finality. Crucially, single-owner transactions bypass consensus altogether and finalize even faster. See Consensus for the Narwhal/Bullshark history and the fast-path vs. consensus-path split.

The SUI Token#

The native token is SUI, with a hard-capped maximum supply of 10 billion. Roughly 40% was circulating in early 2026; the remainder vests on a multi-year schedule into the late 2020s. SUI has four roles:

  • Gas — pays for computation and storage.
  • Staking — delegated to validators to secure the proof-of-stake network and earn rewards drawn from gas fees plus stake subsidies; see staking.
  • Storage fund — fees for on-chain storage are escrowed in a protocol-managed storage fund, which pays future validators for retaining that data and is refunded (rebated) when data is deleted. As usage grows, SUI accumulates in the fund and is effectively removed from circulation.
  • Governance — on-chain voting on protocol parameters.

Why It Matters for DeFi#

  • Parallelism for trading. DeepBook, Sui’s native on-chain central limit order book, exploits parallel execution to deliver a low-latency DEX primitive that other protocols build on as shared liquidity.
  • Low, predictable fees. Gas is fractions of a cent, and the computation/storage split keeps pricing stable; see Gas & Storage.
  • Onboarding. zkLogin lets dApps onboard users with a Google or Apple login instead of a seed phrase, lowering the biggest UX barrier in DeFi.
  • MEV posture. Owned-object transactions that skip consensus are not subject to ordering games, narrowing some MEV surface — though shared-object DeFi (AMMs, lending) still orders through consensus and is not immune.

See DeFi on Sui for the ecosystem map.

Recent Developments#

  • Mysticeti v2 (late 2025) — validation merged into consensus and a new Transaction Driver client path; large latency and validator-CPU reductions. Detail on Consensus.
  • Programmable privacy stack — Mysten released Seal (decentralized secrets management / threshold encryption; whitepaper January 2026) and Nautilus (verifiable off-chain compute in TEEs). Combined with Walrus storage, these target confidential-but-auditable applications and signal a 2026 “privacy pivot.”
  • Walrus mainnet (March 2025) — Mysten’s decentralized blob-storage network went live with the WAL token.
  • DeepBook v3 + DEEP token — the native order book added flash loans, governance, and its own fee token; see DeFi on Sui.
  • Security note. Sui DeFi TVL peaked around $2.6 B in October 2025 before falling to roughly $561 M by February 2026, driven partly by the May 2025 Cetus exploit and broader market weakness — a reminder that ecosystem maturity lags the protocol’s engineering.

Wiki Pages#

The Object Model
Sui Move
Programmable Transaction Blocks
Consensus
Gas & Storage
zkLogin
Walrus
DeFi on Sui
Backward Volatility The Object Model Forward