Cold Custody Wallet Platform

Problem

CoinDCX needed a secure cold-custody wallet platform to protect customer assets at scale. The system required HSM-backed key management, multi-signature workflows, configurable business rules, and reliable deposit/withdrawal processing for 100K customers with 10K daily transactions.

Approach

• Architected the custody platform across Java, Node.js, and Go based on service responsibilities and performance requirements.
• Integrated HSM security and multi-signature support for key management and transaction authorization.
• Built a generic rule engine with ~30ms response time for configurable custody policies.
• Designed for high availability and auditability across deposit and withdrawal flows.

Outcome

• Custody services delivered for 100K customers with 10K daily crypto deposit/withdrawal transactions.
• Rule engine responded in ~30ms, enabling real-time policy enforcement.
• HSM and multi-signature architecture met security requirements for cold storage.
• Platform supported configurable business rules without code changes for each policy update.