Custodiex

About Custodiex

Custodiex Ltd. operates as a specialized developer of secure cold storage solutions for digital assets, targeting institutional clients such as banks, governments, custodians, and other financial institutions. Founded in 2018 by a team of veterans in information security and financial services, the company aimed to address the need for a high-security cold storage solution that remains accessible in real-time for modern financial applications. The founding team includes Mike Sumner, who serves as the Chief Technology Officer & CSO. Their collective background in cryptography, key management, and financial services security underpins the company's technological foundation.

The core of Custodiex's offering is a hybrid physical and technology security ecosystem that provides real-time cold storage for digital assets. The company's services are divided into two main products: 'Blockchain Vaults' and 'Digital Key Vaults'. The 'Blockchain Vaults' offer native support for assets like Bitcoin and Ethereum, including NFTs, stablecoins, and CBDCs. 'Digital Key Vaults' provide a more versatile key management solution for a broad range of cryptographic applications. A key differentiator is the system's ability to provide real-time access and transaction signing without compromising the security of a cold storage environment. This is achieved through proprietary technology that utilizes FIPS 140-3 certified hardware security modules (HSMs) housed in ex-MOD bunkers, ensuring cryptographic processes are air-gapped and executed according to NIST-approved standards.

The business model is centered on providing these highly secure and scalable custody solutions to a client base that ranges from large financial institutions to digital asset exchanges. The company's standards-based API allows for seamless integration with existing client systems, facilitating adoption. The solution is designed to be asset-agnostic and crypto-agile, ensuring future-proofing against new ledger technologies and even the advent of quantum computing. In July 2025, Amdax, a leading digital asset service provider in the Netherlands, acquired a strategic stake in Custodiex, a move intended to bolster Amdax's institutional custody solutions and enhance security standards within the European crypto ecosystem. This strategic partnership aims to combine Custodiex's advanced custody technology with Amdax's regulated financial services to create a robust infrastructure for institutional investors.