Jae Kwon is the co-founder of Cosmos and the creator of Tendermint, one of the most widely adopted consensus engines in blockchain.
Tendermint
In 2014, Kwon created Tendermint, a Byzantine Fault Tolerant (BFT) consensus engine that separates the consensus and networking layers from application logic. Tendermint introduced the concept of instant finality to blockchain — once a block is committed, it cannot be reverted, unlike probabilistic finality in Bitcoin or early Ethereum. Tendermint became one of the most forked and reused consensus implementations in the blockchain industry.
Cosmos
Kwon co-founded the Cosmos project with Ethan Buchman. The Cosmos whitepaper (2016) proposed an “Internet of Blockchains” — a network of independent, interoperable blockchains connected through the Inter-Blockchain Communication (IBC) protocol. The Cosmos Hub launched in 2019.
The Cosmos SDK, built on top of Tendermint, became one of the most popular frameworks for building application-specific blockchains. Major projects built with the Cosmos SDK include BNB Chain (Binance), Cronos, Osmosis, dYdX, and Celestia.
Controversies
Kwon’s tenure has been marked by governance disputes within the Cosmos ecosystem. He stepped back from Tendermint Inc. (later renamed Ignite) and has been involved in disagreements over the direction of the Cosmos Hub, including debates over tokenomics, the role of ATOM, and ecosystem governance. He later founded NewTendermint, Inc. and has advocated for a return to minimalist principles in the Cosmos Hub.