Today, we’re thrilled to announce that we are donating $1m of network profits in our first experiment on retroactive public goods funding.

Our first experiment!

The core idea behind retroPGF is to level the playing field between profit-maximizing startups and nonprofit/OSS projects. Profit-seeking entities have an advantage in their potential for an exit…

It feels like a lifetime ago that we released a unicorn pig hybrid into the world. Today, we’re unveiling our most significant improvement to Optimistic Ethereum since its inception.

This is a massive step towards our mission of bringing native Ethereum to layer two. Contracts will deploy with the click…


Today we are extremely excited to release a new Gateway interface which enables arbitrary token deposits and withdrawals to Optimistic Ethereum! In the previous major release of the Gateway we allowed tokens listed in the Optimism token list to be transferred to L2 (and back). …

Today marks a major milestone for OE: with our latest protocol changes running stably on mainnet, it’s time to begin opening up deployment! Anybody who meets our launch criteria can apply to be whitelisted on mainnet and will be approved within 2 weeks.

With over 750,000 transactions since our last…

Author: Kelvin Fichter

Solidity devs: meet Smock v2. The Solidity mocking library. A collaboration between Optimism and the fantastic team over at DeFi Wonderland.

Smart contract testing has historically been… hard? If not hard, then just confusing. Way back in the early days of Solidity the best way to test…

Author: Matt Masurka

Dearest Etherscan,

How to describe what you mean to us? Let us count the ways. You are…

  • The stable provider of knowledge.
  • The humble watcher of the realm.
  • The telescope with which we marvel upon the decentralized heavens.
  • The bedrock on which the house of DeFi stands.

A note from the editorial team:

There’s so much interesting work happening in the universe of Optimistic Ethereum that we often forget to take a moment to tell the world what we’ve been up to. We’ve heard from a lot of you that you’d like to get a more detailed…

Note: The Optimism team has long been in search of a solution on how to sustainably fund public goods, and we now have the structure of our first experiment thanks to a brilliant design by Vitalik Buterin. …

Almost two years ago at DEVCON V in 2019, we collaborated with Uniswap to build Unipig Exchange, the first-ever demo of Optimistic Rollup.

As an Ethereum L2 at the tail end of a major L1 gas crisis, our most frequently asked questions are:

  1. How cheap ($) will transactions be on Optimistic Ethereum?
  2. What will determine transaction costs on Optimistic Ethereum?

Unsurprisingly, these answers are fundamentally related. In this post, we’re going to tackle…

Ethereum Optimism

Scaling Ethereum

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