How Enterprise Wallet Infrastructure Actually Works: MPC, Custody Models, and Why MetaMask Was Never the Answer

A technical deep-dive into what it actually takes to build wallet infrastructure for banks, fintechs, and financial institutions — from key management to compliance to multi-chain architecture. Every week I talk to developers building on-chain financial products. And almost without fail, the conversation hits the same wall: key management. Not smart contracts. Not tokenomics. Not gas optimisation. Key management. Because the moment you try to build a wallet product that works for a bank, a fintech, or any financial institution serving real users — you discover that the entire existing ecosystem was designed for a completely different problem. MetaMask was built for a developer who wants to interact with DeFi protocols. It was never built for a fintech serving 10 million users in Maharashtra who should never see the word "blockchain." This article is a technical breakdown of what enterprise wallet infrastructure actually requires: the custody models, the MPC architecture, the compliance