Open-source alternatives to Optimism

Sui is a blockchain platform featuring an object-centric state model and resource-oriented smart contracts. It utilizes parallel transaction execution to increase network throughput and supports programmable transaction blocks that bundle multiple operations into single atomic units. The platform distinguishes itself with a capability-based access control system and zero-knowledge login mechanisms, enabling users to authenticate via identity providers without seed phrases. It also implements deterministic object addressing to allow predictable state lookups and supports the creation of soulbo

Erigon is an Ethereum execution client and blockchain archive node designed to maintain full or archive copies of the blockchain. It functions as a Proof-of-Stake validator, an Ethereum RPC server, and a network validator operation tool, providing the core infrastructure to validate blocks and secure the chain. The project distinguishes itself through high-performance storage and data distribution, utilizing a flat key-value state storage system instead of a Merkle Patricia Trie to increase read and write speeds. It employs BitTorrent-based data distribution for immutable historical blockchai

This repository contains the technical specification and architectural blueprint for a decentralized network protocol designed to coordinate autonomous agents. It defines a system model for a global autonomous agentic internet, covering protocol engineering, tokenomics, and the structural design of the network infrastructure. The protocol focuses on a programmable payment system that utilizes trustless atomic swaps and specific spending conditions to release funds. It incorporates a privacy-preserving framework for off-chain transaction execution, allowing service providers and users to maint

This project is an Ethereum zero-knowledge rollup protocol and EVM-compatible execution layer designed for layer two scaling. It provides an environment that runs unmodified bytecode to ensure smart contracts operate without requiring manual changes, finalizing state transitions on the Ethereum mainnet. The system is distinguished by a decentralized sequencer network that manages transaction ordering and preconfirmations to accelerate finality. It employs a hybrid verification model combining zero-knowledge proofs and trusted execution environments to validate state transitions, alongside a m

This project serves as a comprehensive technical reference and educational platform for the Ethereum ecosystem. It provides a deep dive into the fundamental architecture of decentralized ledger systems, covering the core mechanisms that enable trustless state transitions, cryptographic security, and network consensus. The documentation distinguishes itself by bridging high-level conceptual frameworks with practical implementation details. It details the lifecycle of smart contract development, from source code compilation and bytecode analysis to deployment and interaction patterns. Furthermo

Chainlink is a decentralized oracle network that connects smart contracts to off-chain data, computation, and real-world systems. It provides a secure and reliable infrastructure for blockchain applications to access external information, execute automated workflows, and interact with other blockchains. The network is secured by a staking-based model where node operators lock LINK tokens as collateral, which can be slashed for poor performance, incentivizing honest and accurate data delivery. The platform distinguishes itself through a comprehensive set of capabilities that extend beyond basi

Lnd is a full implementation of the Lightning Network protocol, functioning as a Bitcoin Layer 2 daemon that manages payment channels and settles transactions on the Bitcoin blockchain. It serves as an off-chain payment processor and a cryptographic wallet manager, enabling the execution of instant, scalable transactions through a network node. The project distinguishes itself through a focus on secure node networking and programmatic control. It provides gRPC and REST API servers for automating payment workflows and utilizes macaroon-based authorization to delegate granular permissions via c

Fuel Core is a Rust-based implementation of a distributed ledger and a full node for the Fuel v2 protocol. It functions as a layer 2 blockchain client designed to execute binary encoded transactions and synchronize shared state across a decentralized network. The system utilizes a deterministic state machine to ensure all nodes reach the same ledger state and employs a binary-encoded message protocol for network communication. It provides the ability to operate full network nodes or bootstrap private local instances for development and testing. The project covers a broad set of capabilities

BTCPay Server is a non-custodial payment gateway and invoice manager designed for accepting Bitcoin and other cryptocurrencies directly into a private wallet. It serves as a self-hosted payment infrastructure that allows merchants to manage digital invoicing and storefronts without relying on third-party intermediaries. The system distinguishes itself through a non-custodial wallet architecture that ensures private keys remain on the user's own hardware or server. It integrates the Lightning Network for instant, low-cost transactions and provides a hardware-wallet signing bridge to secure tra

bitcoinj is a Java library and software development kit for integrating Bitcoin blockchain functionality into applications. It provides a foundation for implementing blockchain clients and managing digital wallets, allowing for the programmatic tracking of blockchain state and transaction histories. The project includes tools for creating and maintaining keychains and wallets, supported by a command-line interface for administrative wallet management and blockchain state synchronization. The library covers core cryptographic and structural primitives, including deterministic key derivation,

Hazelcast is a distributed data platform that combines an in-memory data grid with a stream processing engine to support real-time analytics and event-driven applications. It functions as a partitioned, distributed key-value store that replicates data across cluster nodes to provide low-latency access and high availability. The platform also serves as a distributed SQL query engine, allowing users to execute standard SQL statements against both in-memory datasets and external data sources. What distinguishes Hazelcast is its use of a distributed consensus subsystem to maintain strongly consis

Reth is a modular, high-performance Ethereum execution layer client written in Rust. It serves as a full Ethereum node that syncs, validates, and serves blockchain data, functioning as an archive node implementation, a high-throughput RPC node server, and a snapshot sync tool. The project is built around a modular component architecture that allows assembling custom node behavior by swapping independent Rust crates for consensus, execution, mempool, and networking. The client distinguishes itself through a staged sync pipeline that downloads headers and bodies online before processing the res

Parity Ethereum is a software implementation of an Ethereum client node that maintains a local copy of the ledger and validates network transactions. It functions as a blockchain network peer and an Ethereum Virtual Machine runtime, providing the environment necessary to process smart contract bytecode and update network state. The project includes systems for cryptographic key management to generate and store the private keys used to sign secure transactions. It enables the operation of a blockchain node and provides mechanisms for Ethereum network synchronization to match the current state

Contracts is a collection of reusable, deployable smart contracts and modular building blocks for EVM blockchains. It provides standard token implementations, marketplace trading components, decentralized governance systems, and revenue splitting logic, enabling developers to build applications using pre-built smart contract libraries and standardized token interfaces. The framework features architectural patterns that support atomic asset bundling, batch transaction multiplexing, and configurable drop mechanisms for scheduled digital asset releases. It combines extensible base contracts wit

java-tron is a Java implementation of a Tron blockchain full node. It provides the core infrastructure for running a network node, validating transactions, and producing blocks. The project includes a proof-of-stake consensus engine, a distributed ledger database, and a smart contract runtime to manage on-chain state transitions. The system is distinguished by its support for both full and lite node operations, utilizing state snapshots to accelerate synchronization and reduce hardware requirements. It features a multi-engine database abstraction that allows for storage migration, partitionin

This project is a protocol tool, server, and indexer for managing digital artifacts and commodities on the Bitcoin blockchain. It provides the core infrastructure for inscribing arbitrary data onto individual satoshis to create permanent, immutable assets and collectibles. The system implements the Runes protocol for creating, minting, and transferring native digital commodities. It distinguishes itself by tracking satoshi rarity based on mining order and establishing parent-child provenance mapping to verify the lineage and authenticity of on-chain inscriptions. The project covers a broad s

This is the official website and documentation hub for the Ethereum blockchain ecosystem. It serves as a comprehensive educational resource and community portal, providing plain-language guides on blockchain fundamentals, wallet usage, and concepts like DeFi and NFTs, alongside technical documentation for developers building decentralized applications. The site offers detailed walkthroughs for creating dapps that interact with the Ethereum blockchain, covering accounts, transactions, and development frameworks. It also provides extensive guidance for node operators, including step-by-step ins

AppKit is a multi-chain wallet connection kit and onboarding framework designed to integrate diverse blockchain networks into a unified interface. It provides a comprehensive suite for connecting applications to EVM, Solana, Bitcoin, TON, and TRON ecosystems, facilitating both self-custodial wallet linking and the creation of new accounts. The project distinguishes itself through a Web3 onboarding system that utilizes social and email-based authentication to generate embedded wallets, reducing cryptographic friction for new users. It further supports advanced identity management via a blockch

This project provides a framework for implementing Ethereum account abstraction, enabling the creation of programmable smart contract wallets. It serves as an implementation of the standardized protocol for managing blockchain accounts, allowing developers to replace traditional private keys with custom logic for authentication and signature verification. The infrastructure centers on a core orchestration contract that validates and executes bundled transaction requests. This architecture supports the grouping of multiple operations into a single network request to optimize gas usage, alongsi

Wagmi is a collection of reactive hooks and a toolkit for interacting with Ethereum blockchains. It provides a comprehensive suite of primitives for managing wallet connections, reading smart contract data, and orchestrating on-chain transactions. The project distinguishes itself through a smart contract interface toolkit that retrieves binary interfaces to generate type-safe hooks and function wrappers. This ensures that blockchain inputs and outputs are validated at compile-time. It also features a specialized utility for translating Ethereum Name Service domains into wallet addresses and p

This project is a blockchain node software implementation that maintains a decentralized ledger using the Ouroboros proof-of-stake consensus protocol. It provides a complete environment for operating a distributed record, including a cryptocurrency wallet backend and a peer-to-peer network layer. The system is distinguished by its use of a UTXO-based ledger model and a diffusion-based state synchronization layer for node communication. It integrates a Public Key Infrastructure with TLS-authenticated communication to secure inter-node traffic and employs hierarchical deterministic key derivati

OpenZeppelin Contracts is a library of modular, secure, and reusable smart contract components designed for the development of decentralized applications. It provides a foundational framework for building standard-compliant contracts, offering battle-tested implementations for token standards, access control, and common utility patterns. The project distinguishes itself through its comprehensive support for complex architectural patterns, including proxy-based upgradeability, role-based access control, and account abstraction. It enables developers to implement modular logic injection via hoo