Custody Security
Pronunciation: KUS-tuh-dee sih-KYOOR-ih-tee
Definition
Custody Security is a security mechanism or control discipline that protects held assets through key management, segregation, approvals, monitoring, reconciliation, governance, physical controls, and tested recovery. Custody security encompasses the controls that keep assets accessible only to authorized parties while preserving availability and accurate ownership records.
Overview
Meaning and scope
Custody Security is a security mechanism or control discipline that protects held assets through key management, segregation, approvals, monitoring, reconciliation, governance, physical controls, and tested recovery. Custody security encompasses the controls that keep assets accessible only to authorized parties while preserving availability and accurate ownership records.
Mechanism and operation
It covers key generation, storage, signing, transaction approval, wallet architecture, access, reconciliation, and operational continuity. Strong designs separate duties, distribute authority, protect keys with suitable hardware, limit hot-wallet exposure, verify destinations independently, and monitor every privileged action. Backups and recovery procedures require equal protection because they can recreate full signing authority. Organizations should test controls under realistic failures, rotate compromised access, review permissions, audit records, and maintain incident plans. Security must align with legal segregation and customer entitlements so technically protected assets remain correctly attributable and returnable. The wallet and custody workflow for Custody Security should locate where evidence enters, where a rule or judgment is applied, what state changes, and which downstream service relies on the result.
Practical payment example
An exchange manages customer deposit keys. Its review covers signing authorization, access segregation, emergency withdrawal controls and reconciled balances, not merely the use of encryption.
Operational checks
Custody security must preserve both signing control and accurate client entitlement through layered technical, operational, governance, and recovery controls.
Distinctions and limits
Review of Custody Security should determine whether safeguards addressing held assets through key management, segregation, and approvals changed exposure in practice, not merely whether a document or setting existed.
Related reading
Related definitions: Custody, transaction approval.
Example
An exchange manages customer deposit keys. Its review covers signing authorization, access segregation, emergency withdrawal controls and reconciled balances, not merely the use of encryption.
Comparison
Review of Custody Security should determine whether safeguards addressing held assets through key management, segregation, and approvals changed exposure in practice, not merely whether a document or setting existed.
Key Takeaway
Custody security must preserve both signing control and accurate client entitlement through layered technical, operational, governance, and recovery controls.
Sources
- NIST Documentation: Cryptographic Standards And Guidelines — NIST (2026-07-30)