Aptos — Scalable Layer 1 Blockchain with Move Language

Introduction

Aptos is a Layer 1 blockchain developed by Aptos Labs, founded by former members of Meta's Diem (Libra) team. It uses the Move programming language for smart contracts and the Block-STM engine for optimistic parallel transaction execution. Aptos focuses on safety, upgradability, and high throughput for mainstream Web3 adoption.

What Aptos Does

• Executes Move smart contracts with resource-oriented programming that prevents asset duplication
• Runs transactions in parallel using Block-STM optimistic concurrency control
• Provides on-chain governance for protocol upgrades without hard forks
• Supports keyless accounts that authenticate using social logins via OpenID Connect
• Offers a modular architecture with hot-swappable consensus and execution components

Architecture Overview

Aptos uses the AptosBFT consensus protocol (derived from DiemBFT/HotStuff). Validators reach agreement on transaction ordering, then the Block-STM execution engine processes transactions optimistically in parallel, detecting and re-executing conflicts. The state is stored as a versioned Jellyfish Merkle Tree. Move bytecode runs in the MoveVM, enforcing resource safety at the type system level.

Self-Hosting & Configuration

• Run a full node by downloading the node binary and configuring fullnode.yaml with network endpoints
• Sync using a state snapshot for faster bootstrapping instead of replaying from genesis
• Use the Aptos CLI to manage accounts, compile Move modules, and interact with the chain
• Deploy Move modules with aptos move publish specifying named addresses and gas budget
• Set up a local testnet with aptos node run-local-testnet for development and testing

Key Features

• Block-STM parallel execution processes transactions concurrently without developer hints
• Move language with linear types ensures assets cannot be copied or implicitly discarded
• On-chain governance allows validator-approved protocol upgrades without chain halts
• Keyless accounts enable wallet creation using Google, Apple, or other OIDC providers
• Fungible Asset standard provides a unified interface for tokens beyond the legacy Coin module

Comparison with Similar Tools

• Sui — also Move-based but uses object-centric model; Aptos uses account-centric model with Block-STM
• Solana — parallel execution via Sealevel requires upfront account declarations; Aptos discovers parallelism automatically
• Ethereum — sequential EVM execution; Aptos achieves higher throughput via Move and Block-STM
• Avalanche — subnet-based scaling; Aptos scales at the base layer through parallel execution
• Near — sharded architecture; Aptos avoids cross-shard complexity with single-chain parallelism

FAQ

Q: What is Move and why does Aptos use it? A: Move is a resource-oriented language where digital assets are first-class types that cannot be copied or dropped. This prevents common vulnerabilities like double-spending and reentrancy.

Q: How does Block-STM enable parallel execution? A: Block-STM optimistically executes all transactions in parallel, tracks read/write dependencies, and re-executes only those that conflict. No developer annotations are needed.

Q: Does Aptos support EVM compatibility? A: Not natively. Aptos uses the MoveVM. Third-party projects have built EVM compatibility layers on top.

Q: What is the APT token used for? A: APT is the native token for gas fees, staking with validators, and participating in on-chain governance votes.

Sources

• https://github.com/aptos-labs/aptos-core
• https://aptos.dev/