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OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States Chief ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER Arbitrum Rollup. An Arbitrum Rollup chain is a super scaled Layer 2 (L2) chain. Like all Rollups, the Arbitrum Rollup chain is built on top of and secured by the Ethereum blockchain, and all transaction data is logged on Ethereum. From a user and developer perspective, interacting with Arbitrum feels exactly like interacting withEthereum.
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER Token Bridging. The Arbitrum protocol's ability to pass messages between L1 and L2 can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721 tokens,etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER Once you've added the Arbitrum Testnet V5 network to Metamask, you should be able to interact with the Arbitrum chain just like you would with Ethereum. The are a couple things to note on the Arbitrum chain. Arbitrum uses an EIP-1559-like gas auction system so the gas price you list in your transaction is a bid, but the actual price may be lower. INSIDE ARBITRUM · OFFCHAIN LABS DEV CENTER Inside Arbitrum. This document is a deep-dive explanation of Arbitrum’s design and the rationale for it. This isn’t API documentation, nor is it a guided tour of the code--look elsewhere for those. “Inside Arbitrum” is for people who want to understand Arbitrum’s design. MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER The lifecycle of sending a message from layer 2 to layer 1 can be broken down into roughly 4 steps, only 2 which (at most!) require the end user to publish transactions. 1. Publish L2 to L1 transaction (Arbitrum transaction) A client initiates the process by publishing a message on L2 via ArbSys.sendTxToL1 (see ArbSys, and seeArbTokenBridge
RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
ARBITRUM EXPLORER
Arbitrum Block Explorer. Status TX Hash From To Nonce Block NumberTimestamp
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States Chief ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER Arbitrum Rollup. An Arbitrum Rollup chain is a super scaled Layer 2 (L2) chain. Like all Rollups, the Arbitrum Rollup chain is built on top of and secured by the Ethereum blockchain, and all transaction data is logged on Ethereum. From a user and developer perspective, interacting with Arbitrum feels exactly like interacting withEthereum.
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER Token Bridging. The Arbitrum protocol's ability to pass messages between L1 and L2 can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721 tokens,etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER Once you've added the Arbitrum Testnet V5 network to Metamask, you should be able to interact with the Arbitrum chain just like you would with Ethereum. The are a couple things to note on the Arbitrum chain. Arbitrum uses an EIP-1559-like gas auction system so the gas price you list in your transaction is a bid, but the actual price may be lower. INSIDE ARBITRUM · OFFCHAIN LABS DEV CENTER Inside Arbitrum. This document is a deep-dive explanation of Arbitrum’s design and the rationale for it. This isn’t API documentation, nor is it a guided tour of the code--look elsewhere for those. “Inside Arbitrum” is for people who want to understand Arbitrum’s design. MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER The lifecycle of sending a message from layer 2 to layer 1 can be broken down into roughly 4 steps, only 2 which (at most!) require the end user to publish transactions. 1. Publish L2 to L1 transaction (Arbitrum transaction) A client initiates the process by publishing a message on L2 via ArbSys.sendTxToL1 (see ArbSys, and seeArbTokenBridge
RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
ARBITRUM EXPLORER
Arbitrum Block Explorer. Status TX Hash From To Nonce Block NumberTimestamp
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States ChiefARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge INSTALLATION · OFFCHAIN LABS DEV CENTER Ubuntu 18.04. Using apt: sudo apt update sudo apt install -y curl python3 python3-pip. Then setup docker using the official instructions. Also setup docker compose using AVM DESIGN RATIONALE · OFFCHAIN LABS DEV CENTER AVM design rationale. This document outlines the design rationale for the Arbitrum Virtual Machine (AVM) architecture. The starting point for the AVM design is the Ethereum Virtual Machine (EVM). Because Arbitrum aims to efficiently execute programs written or compiled for EVM, Arbitrum uses many aspects of EVM unchanged. CONTRACT DEPLOYMENT · OFFCHAIN LABS DEV CENTER Contract Deployment. Arbitrum supports standard EVM contract deployment. This allows standard Solidity smart contracts to be deployed on Arbitrum Chains using existing developer tools. To deploy your contracts, you need to set your deployment tool to deploy on an Arbitrum rollup chain instead of Ethereum. While this should bestraightforward
INBOX.SOL SPEC · OFFCHAIN LABS DEV CENTER constructor(contract IBridge _bridge) (public) sendL2MessageFromOrigin(bytes messageData) → uint256 (external). Send a generic L2 message to the chain. This method is an optimization to avoid having to emit the entirety of the messageData in a log. L1 FINALITY AND FAST WITHDRAWALS · OFFCHAIN LABS DEV CENTER L1 Finality and Fast Withdrawals. As discussed in the section on finality, because Arbitrum's execution happens optimistically, the Ethereum blockchain cannot immediately confirm the correct state and must wait for the challenge window to expire (or until all challenges are resolved). When it comes to execution within the Rollup this doesnot
ARBITRUM VM INFORMAL ARCHITECTURE SPEC · OFFCHAIN LABS DEV This document describes informally the semantics of the Arbitrum VM architecture. This version is simplified, compared to the one described in the Arbitrum paper published in USENIX Security 2018. This version is also tailored to more closely match the Ethereum data formats and instruction set, to ease implementation of an EVM-to-AVMtranslator.
DEVELOPER.OFFCHAINLABS.COMTRANSLATE THIS PAGE ‹ í]oÜ8’ïù œ `m϶ÔVÛNâÄÝ€c'™ÜÙ±/ödî ÄnÑ–D )u»³ àžöù°ÿb Á ÷¸?e~ÉU‘ú–ì8éìà n‰*V ‹UŪ"¥ƒ ŽÏŽ.ÿãü%ñ“0 à_ Ðh> DEVELOPER.OFFCHAINLABS.COMTRANSLATE THIS PAGE ‹ íÛrÛ8²ïó MÕÊÞ )K¶“8±´å[.ç8qÎØ;s¶R) DB$l’ íNªöiŸ·ö/ö ¶j ÷SæKN7@R$E%ž({žœ*‹$Ðèn4º 4 ãoϯÎnþøö‚„:ŽÆÇøK"šOFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
AVM DESIGN RATIONALE · OFFCHAIN LABS DEV CENTERSEE MORE ON DEVELOPER.OFFCHAINLABS.COM SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
ARBITRUM EXPLORER
Arbitrum Block Explorer. Status TX Hash From To Nonce Block NumberTimestamp
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
AVM DESIGN RATIONALE · OFFCHAIN LABS DEV CENTERSEE MORE ON DEVELOPER.OFFCHAINLABS.COM SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
ARBITRUM EXPLORER
Arbitrum Block Explorer. Status TX Hash From To Nonce Block NumberTimestamp
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. INSTALLATION · OFFCHAIN LABS DEV CENTER Setup instructions. Follow the instructions for supported operating systems or use the comprehensive list of dependencies. 1. Installpython3 and docker:
MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER Standard Arbitrum Transactions: Calls from clients. Standard, client-generated transaction calls on the Arbitrum chain are sent through the EthBridge using Inbox.sendL2Message: L1 FINALITY AND FAST WITHDRAWALS · OFFCHAIN LABS DEV CENTER As discussed in the section on finality, because Arbitrum's execution happens optimistically, the Ethereum blockchain cannot immediately confirm the correct state and must wait for the challenge window to expire (or until all challenges are resolved).. When it comes to execution within the Rollup this does not pose any problem or add any delay. The Arbitrum Rollup protocol manages a tree of INSIDE ARBITRUM · OFFCHAIN LABS DEV CENTER This document is a deep-dive explanation of Arbitrum’s design and the rationale for it. This isn’t API documentation, nor is it a guided tour of the code--look elsewhere for those. “Inside Arbitrum” is for people who want to understand Arbitrum’s design. ARBITRUM ROLLUP PROTOCOL · OFFCHAIN LABS DEV CENTER Arbitrum Rollup Protocol Design. Arbitrum Rollup is an off-chain protocol that is managed by an on-chain Ethereum contract. A dApp developer has a contract or set of contracts written in Solidity, and the developer wants to deploy those contracts onto a Layer 2 Arbitrum Rollup chain (ArbChain). GLOSSARY OF ARBITRUM TERMS · OFFCHAIN LABS DEV CENTER - ArbOS: Layer 2 "operating system" that trustlessly handles system-level operations CONTRACT DEPLOYMENT · OFFCHAIN LABS DEV CENTER Arbitrum supports standard EVM contract deployment. This allows standard Solidity smart contracts to be deployed on Arbitrum Chains using existing developer tools. INBOX.SOL SPEC · OFFCHAIN LABS DEV CENTER constructor(contract IBridge _bridge) (public) sendL2MessageFromOrigin(bytes messageData) → uint256 (external). Send a generic L2 message to the chain. This method is an optimization to avoid having to emit the entirety of the messageData in a log. CONFIRMATION AND FINALITY IN ARBITRUM ROLLUP · OFFCHAIN As in Ethereum, transactions in Arbitrum don't become final right away. If there are malicious validators, they can make conflicting claims about which behaviors of an ArbChain are correct, and the system will take some time to sort out who is correct.OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER Standard Arbitrum Transactions: Calls from clients. Standard, client-generated transaction calls on the Arbitrum chain are sent through the EthBridge using Inbox.sendL2Message: RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
ARBITRUM EXPLORER
Arbitrum Block Explorer. Filters. There was an error fetching thedata.
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER Standard Arbitrum Transactions: Calls from clients. Standard, client-generated transaction calls on the Arbitrum chain are sent through the EthBridge using Inbox.sendL2Message: RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
ARBITRUM EXPLORER
Arbitrum Block Explorer. Filters. There was an error fetching thedata.
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
INSTALLATION · OFFCHAIN LABS DEV CENTER Setup instructions. Follow the instructions for supported operating systems or use the comprehensive list of dependencies. 1. Installpython3 and docker:
FRONTEND INTEGRATION · OFFCHAIN LABS DEV CENTER Arbitrum comes with tools to make front-end integration as seamless as possible for Ethereum web developers. Arbitrum nodes support the Ethereum JSON-RPC API; thus, popular Ethereum libraries for interacting with the Ethereum chain can be used for Arbitrum interactions with little-to-no modifications.. For Ethereum/Arbitrum "bridge" functionality — methods that involve communicating between L1 FINALITY AND FAST WITHDRAWALS · OFFCHAIN LABS DEV CENTER As discussed in the section on finality, because Arbitrum's execution happens optimistically, the Ethereum blockchain cannot immediately confirm the correct state and must wait for the challenge window to expire (or until all challenges are resolved).. When it comes to execution within the Rollup this does not pose any problem or add any delay. The Arbitrum Rollup protocol manages a tree of ARBITRUM ROLLUP PROTOCOL · OFFCHAIN LABS DEV CENTER Arbitrum Rollup Protocol Design. Arbitrum Rollup is an off-chain protocol that is managed by an on-chain Ethereum contract. A dApp developer has a contract or set of contracts written in Solidity, and the developer wants to deploy those contracts onto a Layer 2 Arbitrum Rollup chain (ArbChain). AVM DESIGN RATIONALE · OFFCHAIN LABS DEV CENTER This document outlines the design rationale for the Arbitrum Virtual Machine (AVM) architecture. The starting point for the AVM design is the Ethereum Virtual Machine (EVM). INSIDE ARBITRUM · OFFCHAIN LABS DEV CENTER This document is a deep-dive explanation of Arbitrum’s design and the rationale for it. This isn’t API documentation, nor is it a guided tour of the code--look elsewhere for those. “Inside Arbitrum” is for people who want to understand Arbitrum’s design. GLOSSARY OF ARBITRUM TERMS · OFFCHAIN LABS DEV CENTER ArbOS: Layer 2 "operating system" that trustlessly handles system-level operations; ArbGas: Unit for pricing execution on Arbitrum; denominated in Ether, Arbitrum's native currency. INBOX.SOL SPEC · OFFCHAIN LABS DEV CENTER constructor(contract IBridge _bridge) (public) sendL2MessageFromOrigin(bytes messageData) → uint256 (external). Send a generic L2 message to the chain. This method is an optimization to avoid having to emit the entirety of the messageData in a log.OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER Standard Arbitrum Transactions: Calls from clients. Standard, client-generated transaction calls on the Arbitrum chain are sent through the EthBridge using Inbox.sendL2Message: RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
ARBITRUM EXPLORER
Arbitrum Block Explorer. Filters. There was an error fetching thedata.
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. ARBITRUM ROLLUP BASICS · OFFCHAIN LABS DEV CENTER This document explains the basic concepts behind Arbitrum Rollup, an Optimistic Rollup protocol designed for the Ethereum blockchain, andprovides links
ARBITRUM BRIDGE
Arbitrum L1/L2 Token Bridge TOKEN BRIDGING · OFFCHAIN LABS DEV CENTER The Arbitrum protocol's ability to (/docs/L1_L2_Messages) can be leveraged to trustlessly move assets from Ethereum to an Arbitrum chain and back. Any asset / asset type can in principle be bridged, including Ether, ERC20 tokens, ERC-721tokens, etc.
ARBITRUM DEVELOPER QUICKSTART · OFFCHAIN LABS DEV CENTER Arbitrum is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has three modes: AnyTrust Channels, AnyTrust Sidechains, and Arbitrum Rollup. The following documentation describes how to use Arbitrum Rollup, which is currently live on testnet. Whether you're a developer that just wants to start building or PUBLIC TESTNET GUIDE · OFFCHAIN LABS DEV CENTER In order to make it easy for people to get started using Arbitrum Rollup, we've launched our own hosted Arbitrum Rollup chain hosted onthe Kovan testnet.
MESSAGING BETWEEN LAYERS · OFFCHAIN LABS DEV CENTER Standard Arbitrum Transactions: Calls from clients. Standard, client-generated transaction calls on the Arbitrum chain are sent through the EthBridge using Inbox.sendL2Message: RUNNING ON LOCAL BLOCKCHAIN · OFFCHAIN LABS DEV CENTER Basics. To run Arbitrum locally, you need several things: A local Ethereum blockchain (the L1) A set of Arbitrum smart contractsdeployed on that L1
SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
ARBITRUM EXPLORER
Arbitrum Block Explorer. Filters. There was an error fetching thedata.
OFFCHAIN LABS
Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. SOLIDITY CONTRACT DOCUMENTATION · OFFCHAIN LABS DEV CENTER ### L1/L2 Bridge. ArbOS Data Formats. Docs Developer Quickstart AVMSpecification
INSTALLATION · OFFCHAIN LABS DEV CENTER Setup instructions. Follow the instructions for supported operating systems or use the comprehensive list of dependencies. 1. Installpython3 and docker:
FRONTEND INTEGRATION · OFFCHAIN LABS DEV CENTER Arbitrum comes with tools to make front-end integration as seamless as possible for Ethereum web developers. Arbitrum nodes support the Ethereum JSON-RPC API; thus, popular Ethereum libraries for interacting with the Ethereum chain can be used for Arbitrum interactions with little-to-no modifications.. For Ethereum/Arbitrum "bridge" functionality — methods that involve communicating between L1 FINALITY AND FAST WITHDRAWALS · OFFCHAIN LABS DEV CENTER As discussed in the section on finality, because Arbitrum's execution happens optimistically, the Ethereum blockchain cannot immediately confirm the correct state and must wait for the challenge window to expire (or until all challenges are resolved).. When it comes to execution within the Rollup this does not pose any problem or add any delay. The Arbitrum Rollup protocol manages a tree of ARBITRUM ROLLUP PROTOCOL · OFFCHAIN LABS DEV CENTER Arbitrum Rollup Protocol Design. Arbitrum Rollup is an off-chain protocol that is managed by an on-chain Ethereum contract. A dApp developer has a contract or set of contracts written in Solidity, and the developer wants to deploy those contracts onto a Layer 2 Arbitrum Rollup chain (ArbChain). AVM DESIGN RATIONALE · OFFCHAIN LABS DEV CENTER This document outlines the design rationale for the Arbitrum Virtual Machine (AVM) architecture. The starting point for the AVM design is the Ethereum Virtual Machine (EVM). INSIDE ARBITRUM · OFFCHAIN LABS DEV CENTER This document is a deep-dive explanation of Arbitrum’s design and the rationale for it. This isn’t API documentation, nor is it a guided tour of the code--look elsewhere for those. “Inside Arbitrum” is for people who want to understand Arbitrum’s design. GLOSSARY OF ARBITRUM TERMS · OFFCHAIN LABS DEV CENTER ArbOS: Layer 2 "operating system" that trustlessly handles system-level operations; ArbGas: Unit for pricing execution on Arbitrum; denominated in Ether, Arbitrum's native currency. INBOX.SOL SPEC · OFFCHAIN LABS DEV CENTER constructor(contract IBridge _bridge) (public) sendL2MessageFromOrigin(bytes messageData) → uint256 (external). Send a generic L2 message to the chain. This method is an optimization to avoid having to emit the entirety of the messageData in a log. You need to enable JavaScript to run this app.Open Menu
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OFFCHAIN
LABS
Building Arbitrum for Secure Ethereum Dapps. Experience economical efficiency of the blockchain without limits. The ideal scaling solution for many DeFi apps Arbitrum Rollup can scale any Ethereum contract. Enjoy the fully trustless security of the underlying blockchain.Now On Mainnet
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For media inquiries, contact media@offchainlabs.comTEAM
ED FELTEN
CO-FOUNDER + CHIEF SCIENTIST Ed Felten is Co-founder and Chief Scientist at Offchain Labs. He is on leave from Princeton University, where he is the Robert E. Kahn Professor of Computer Science and Public Affairs. From 2015 to 2017 he served at the White House as Deputy United States Chief Technology Officer and senior advisor to the President. He is an ACM Fellow and member of the National Academy of Engineering. Outside of work, he is an avid runner, cook, and L.A. Dodgers fan.STEVEN GOLDFEDER
CO-FOUNDER + CEO
Steven Goldfeder is Co-founder and Chief Executive Officer at Offchain Labs. He holds a PhD from Princeton University, where he worked at the intersection of cryptography and cryptocurrencies. He is a co-author of _Bitcoin and Cryptocurrency Technologies_, the leading textbook oncryptocurrencies.
HARRY KALODNER
CO-FOUNDER + CTO
Harry Kalodner is Co-Founder and Chief Technology Officer at Offchain Labs where he leads the engineering team. Before the company he attended Princeton as a PhD candidate where his research explored economics, anonymity, and incentive compatibility of cryptocurrencies. When not up at 3:00am writing code, Harry occasionally sleeps.LEE BOUSFIELD
SENIOR SOFTWARE ENGINEER Lee Bousfield is a software engineer specialized in cryptocurrency and cryptography, having worked at Kraken and Nano. He's usually working on the Arbitrum Virtual Machine, or in his free time, playing videogames.
JOSHUA COLVIN
SENIOR SOFTWARE ENGINEER Joshua Colvin is a software engineer with a degree in Computer Science and Engineering. When he is not working, he enjoys cooking and makingcraft cocktails.
RACHEL FRANKS
SOFTWARE ENGINEER
Rachel Franks is a software developer fascinated with cryptocurrency and compiler technologies. Having studied consensus algorithms as a PhD candidate at Purdue, she enjoys reading about new discoveries in the research literature. Outside of crypto she creates video games, writes poetry, and is always learning something new.ROBERT GATES
SOFTWARE ENGINEER
Robert Gates is a Software Engineer with a degree in mathematics and an in progress Msc in Mathematics and Computer Science. When he is not working, he enjoys playing table tennis and writing music.DANIEL GOLDMAN
SOFTWARE ENGINEER
Daniel Goldman is a software developer, writer, and all-around crypto-enthusiast. He previously co-founded Abacus, providing technical consulting for projects in the cryptocurrency space. He has an undergraduate background in Mathematics and Philosophy. When he's not coding, tweet-storming, or reading whitepapers, he enjoys chess, playing guitar, and riding his bike.FRED LACS
SOFTWARE ENGINEER
Frederico Lacs is a Software Engineer with a degree in Computer Science. He is fascinated by distributed ledger technology, complex systems, and the oxford comma.DANIEL SILVERBERG
OPERATIONS MANAGER
Daniel Silvereberg has a BA in Economics from Queens College and brings with him a vast knowledge of sales and client relationships. He has worked in collaboration with multinational brands and Fortune 500 companies. Daniel has a deep understanding of operations, sales, and business development. He brings this knowledge and experience to the team as the Operations Manager since 2019.A.J. WARNER
DIRECTOR OF PARTNERSHIPSAND STRATEGY
A.J. Warner has a JD/MBA from New York University and worked as a transactional attorney prior to joining Offchain Labs. When he is not working, A.J. can be found spending time with his family or playinghockey.
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EVENTS
Members of our team will be at these upcoming events. Feel free to email us at info@offchainlabs.com if you'd like to connect at any of these venues.EVENTS SCHEDULE
* Blockchain Summit LondonOctober 20-21 2020
* Anon Summit
October 21-22 2020
* Blockchain Expo EuropeNovember 24-25 2020
* Paris Blockchain Week SummitDecember 9-10 2020
PAST EVENTS
* ETHDenver
February 14-16 2020
* Stanford Blockchain ConferenceFebruary 19-21 2020
* ETHNewYork
May 2020
CAREERS
JOIN US IN OUR MISSION TO MAKE BLOCKCHAIN BETTER. WE’RE LOOKING FOR THE USUAL STUFF- MOTIVATED AND EXPERIENCEDDEVELOPERS.
FOR MORE INFORMATION, EMAIL US AT JOBS@OFFCHAINLABS.COM. INTEGRATION ENGINEER Engineering | Remote | Full-timeLearn More
QA ENGINEER
Engineering | Remote | Full-timeLearn More
SENIOR SOFTWARE ENGINEER Engineering | Remote | Full-timeLearn More
SOFTWARE ENGINEER
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