Input Output

Overview

Input Output is an engineering and research company that builds blockchain software and helps founders turn early ideas into working companies. Teams come to it for protocol engineering, product development, and the legal, funding, and launch support a young company usually lacks¹. Its defining habit is publishing the underlying science as academic papers before the engineering starts².

Input Output built Cardano and now coordinates the engineering behind the software that runs it, work it shares with independent specialist companies, and it founded Midnight, a network designed so that transaction details can stay private³. The company works as a venture studio, which means it develops products alongside their founders and spins them out as separate businesses rather than holding everything in house⁴.

Key Features

• Research that becomes shipped software. A staged review process moves an idea from fundamental research through validation to a tested implementation². Cardano's higher-throughput consensus work began as a peer-reviewed cryptography paper before it became engineering⁵.
• Contract checking at the level the machine executes. A verification tool from its engineering teams rebuilds Cardano's contract execution engine inside a proof assistant, checks a contract against the properties a developer states in advance, and hands back the exact inputs that break one of those properties when it fails⁶.
• A defined path from prototype to company. The venture studio moves founders through six named stages, from Vision and Intake through Idea Co, Proto Co, and Launch Co to Mature Co, with support along the way covering feasibility testing, prototyping, legal entity setup, staffing, incentive design, and investor readiness¹.
• Code you can read. Input Output's public repositories hold developer tooling, shared libraries, and the protocol code its teams work on, written mainly in Haskell⁷.
• Products that stand on their own. Alongside protocol work, the company built and released Lace, a light wallet. Its product portfolio also carries work it backs rather than wrote: Blockfrost, the Cardano data API built by Five Binaries, which Input Output invested in and which continues to run as an independent business⁸, and Project Catalyst, a community funding process decided by community voting⁹.

What to Expect

The site reads as a company site rather than a product you sign up for. Founders and organizations get the venture studio pages, which set out what support is available at each stage of the venture lifecycle; they describe a submission portal but do not link to one¹. Anyone shopping for engineering work will find the fields the company takes on grouped as solution areas, among them digital identity, decentralized finance, privacy-preserving data handling, and the languages used to write smart contracts¹⁰.

Researchers and engineers get a public library of papers covering cryptography, consensus, formal methods, and the design of economic incentives², alongside the repositories where the implementations live⁷. Each product carries its own documentation, so technical reading starts from the product rather than from the company site.

Parts of Cardano's core engineering are handled by independent specialist companies, with Input Output coordinating delivery and the work landing in public repositories¹¹. It operates as a research house and coordinator as much as a single engineering shop.