Introducing Onramp Guardian: The Final Layer of Bitcoin Security
Brian Cubellis | Chief Strategy Officer
Aug 25, 2025
For over a decade, bitcoin custody has been framed as a simple question of securing private keys. But reality is far more complex. Investors face not just the risk of hacks or lost passwords, but also phishing, social engineering, SIM swaps, and even coercion.
The real challenge of custody isn’t access, it’s control.
How do you ensure bitcoin can only move when it should? How do you defend not just against malicious outsiders, but against mistakes, rushed decisions, or being forced under duress?
This is why we built Onramp Guardian.
What is Guardian?
Guardian is Onramp’s new operational security framework, an added layer of protection wrapped around our multi-institution custody (MIC) vaults. It introduces enhanced identity checks, time delays, velocity limits, and fraud detection into the withdrawal flow, making unauthorized actions nearly impossible.
Where MIC ensures no single party can move your bitcoin, Guardian ensures that even if attackers breach accounts, impersonate you with AI, or pressure you in person, the bitcoin still doesn’t move.
Guardian is designed not just to help you hold bitcoin securely, but to resist being forced to move it.
Guardian Tiers
Guardian comes in two tiers: Guardian Core, included with all Onramp MIC accounts, and Guardian Private, a bespoke configuration for large balances and client-specific needs.
Guardian Core (Default for All MIC Clients)
Every Onramp client automatically benefits from Guardian’s baseline protections:
- Multi-Institution Custody Solution (MIC): 2-of-3 independent institutional approvals required for every transaction.
- Lloyd’s of London Insurance Policy: Third-party validated coverage against collusion, negligence, or compromise.


