Ethan Buchman is a distributed-systems researcher and entrepreneur who co-founded the Cosmos and Tendermint projects. He co-authored the 2016 Cosmos white paper with Jae Kwon and later helped build Cosmos-related infrastructure through Informal Systems. His work has since shifted: Informal says it ended its formal Cosmos involvement in 2025, and its 2026 update says Buchman is focusing on Cycles.
Cosmos and Tendermint
Buchman and Jae Kwon presented Cosmos as an “Internet of Blockchains”: independent application chains that could communicate while retaining their own governance and security choices. The 2016 white paper is a joint work, not a solo paper by Buchman. Tendermint’s Byzantine fault-tolerant consensus implementation became widely used in the Cosmos ecosystem and is now developed as CometBFT. Cosmos Hub, the Cosmos SDK, CometBFT, and IBC are related but separate projects and components; no single founder authored every part of that stack.
Work on Interoperability and Verification
Buchman co-founded Informal Systems, whose earlier work included research, engineering, and formal methods for distributed systems and Cosmos infrastructure. The IBC specification is maintained by a wider open-source community in its canonical repository. Informal’s April 2026 update says the company has been independent of the Interchain Foundation since mid-2025 and is no longer involved in Cosmos governance or development. It names Buchman as focusing on Cycles, an open clearing protocol. This is a more current picture than describing him as an active Cosmos executive.
Why the Distinction Matters
People sometimes use “Cosmos” to mean the Hub, the app-chain ecosystem, the SDK, Tendermint/CometBFT, or IBC. Those labels describe different things. Buchman’s public history connects him to the early vision and technical community, while present-day maintenance is distributed among independent teams, foundations, and contributors. When assessing a current protocol feature, check the project’s maintained specification and implementation rather than assuming a historical founder still controls it.
Limits and Criticism
Interoperability standards do not make every connected chain equally secure. IBC connections depend on the participating chains’ light clients, consensus assumptions, software, and relayers; users must understand the trust model for a particular route. The Cosmos app-chain approach also distributes responsibility across many teams, which can make ecosystem-wide updates and user experience less uniform. Those are design and coordination questions, not claims about Buchman’s personal conduct.
Social Media Sentiment
A November 2025 r/cosmosnetwork thread about possible EVM compatibility for the Cosmos Hub shows mixed, limited discussion: participants debated whether the change could improve interoperability and whether the proposal was still active. It concerns one technical proposal, not Buchman personally or the Cosmos community as a whole. Read the cited Reddit discussion.
Last updated: 2026-10
Related Terms
See Also
- How Do Crypto Bridges Work—and Why Are They a Hack Target?
- Are Layer 2 Networks Actually Decentralized?
- What Is Tokenomics?
- Swap crypto with ChangeNOW
Sources
- Cosmos: The Internet of Blockchains White Paper — identifies the 2016 Cosmos vision as a joint paper by Ethan Buchman and Jae Kwon.
- Informal Systems: Reintroducing Informal — describes the organization’s post-2025 independence from Cosmos and says Buchman is focusing on Cycles.
- IBC Interchain Standards Repository — is the canonical source for current IBC specifications and implementations maintained by its contributor community.
- Ethan Buchman: About — provides his own account of co-founding Cosmos and Tendermint and transitioning to Cycles.