Bitcoin ETF custody is the institutional safekeeping of the bitcoin backing a spot exchange-traded fund, performed by qualified custodians under regulatory and audit requirements. It typically uses cold storage with multi-signature or multi-party-computation key management, segregation of client assets, insurance, and proof-of-reserves attestation. This custody model bridges traditional regulated finance and on-chain asset control, and is central to the integrity of spot Bitcoin ETFs.
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- Qualified custodians segregate fund assets, hold keys in geographically distributed cold storage, and publish reserve attestations. Multi-signature and MPC schemes ensure no single operator can move funds, satisfying the security and compliance demands of issuers and regulators.