Skills
Overview
My work centers on blockchain custody, signing and key management, and security engineering.
Specialized Expertise
Blockchain Custody & Chain Integration
I own core custody integrations at a regulated custodian securing billions in assets. I built the full Bitcoin UTXO lifecycle (selection, PSBT, SegWit, reorg detection, dynamic fees) and a generic Ethereum transaction-execution engine and the ETH staking lifecycle across the pre- and post-Pectra upgrades, and I am the sole owner of all Cosmos integrations (6 chains). I designed Solana's integration architecture and maintain several other L1s — 10+ integrated in production.
Signing & Key Management
I operate the full custody signing flow: intent verification, on-chain enrichment, HSM-backed signing, and broadcast. I contributed to the HSM implementation and maintain the pipeline, grounded in elliptic-curve cryptography (secp256k1) and ECDSA/EdDSA, with a strong command of threshold-signature schemes (FROST, CGGMP21) and MPC/TSS custody architectures.
Security Engineering
I build and ship security tooling as open source: Keygrain, a stateless password manager built on Argon2id and HMAC-SHA256, and Mailcheck, an email-security analysis platform. Both use standard cryptographic primitives and are backed by extensive automated testing.