Jordi Baylina

Jordi Baylina is one of the most recognised Spanish-speaking blockchain developers and a technical reference within the Ethereum ecosystem. A telecommunications engineer by training, he has spent years building smart contracts, open-source tools, and protocols now used by projects such as Status, Aragon, and district0x. His profile combines implementation, security auditing, and a vision of how decentralised infrastructure evolves. Since Ethereum’s early years, he has contributed widely adopted infrastructure pieces such as the MiniMe contract and cryptographic libraries in Solidity. He also co-founded community-oriented initiatives including Giveth and DAppNode, and took part in the technical response to TheDAO hack in 2016. Those experiences shaped his focus on security, transparency, and public network resilience. Over the past decade he led the development of iden3, focused on self-sovereign identity and privacy, and created Circom and SnarkJS, standard tools for designing zero-knowledge circuits. As founder of Hermez Network, he drove one of the first ZK rollups on mainnet; the project was integrated into Polygon, where he directed the deployment of the zkEVM compatible with Ethereum contracts. Vitalik Buterin executed the first transaction on that network — a milestone reflecting the technical weight of his work. In Spain and Europe, Baylina is consulted when Ethereum upgrades — Proof of Stake, scalability, and new smart contracts — need to be explained with rigour and without oversimplification. His publishable GitHub track record and conference appearances such as EthCC position him as a verifiable authority for anyone seeking reliable context on ETH, Bitcoin, and on-chain privacy.

• Smart contract development on Ethereum
• Zero-knowledge proofs (ZK) and rollups
• Decentralised identity and on-chain privacy
• Smart contract security and auditing
• Ethereum scalability and protocol upgrades