Multi-Institution Custody (MIC)

Multi-Institution Custody emerged as the architectural answer to the failure modes that produced every major Bitcoin custodial loss since 2011: commingling, unilateral control, counterparty concentration, and snapshot blindness. By distributing key control across multiple independent institutions, MIC eliminates the structural conditions under which those failures occur, rather than attempting to detect them after the fact through disclosure regimes.

The core property of MIC is that no single party can move the assets. The keys are held by separate regulated institutions operating in different jurisdictions, with independent infrastructure, independent signing flows, and independent verification of large transactions. A compromise at any one institution does not give attackers control of the assets. A coercive request to any one institution can be reviewed by the others. The architecture itself prevents the failure modes that disclosure-only regimes can only document.

Onramp's implementation of Multi-Institution Custody uses a 2-of-3 multi-signature quorum across three independent regulated institutions. The default configuration holds keys at Onramp, BitGo Trust, and CoinCover. For certain account types, Tetra Trust is available as an additional keyholder option, providing additional jurisdictional diversification. Tetra Trust is not available for the Onramp Bitcoin IRA product.

MIC differs from collaborative custody (Unchained, Casa) in that the holder is not required to participate in the signing flow operationally. In collaborative custody, the holder controls one or more keys directly and bears operational responsibility for hardware-wallet management; the architectural distribution comes from pairing the holder's keys with one or more institutional keys. In MIC, the architectural distribution comes from multiple institutional keyholders, with the holder verifying transactions through normal client channels rather than signing them directly.

MIC differs from single-custodian qualified custody (Coinbase Custody, Fidelity Digital Assets, BitGo's qualified custody offered alone) in that the custody is not concentrated at any single party. Single-custodian qualified custodians can be operationally rigorous and regulated, but they remain a single party whose compromise, insolvency, or coercion would result in loss.

A separate Onramp product, Onramp Finance, provides single-custodian custody with BitGo Trust for brokerage and banking features (buying Bitcoin, yield, lending, the rewards card) with an upgrade path to full Multi-Institution Custody. Onramp Finance is the financial-services layer; the core MIC product is the architectural implementation of the Proof of Ownership standard.