Qualified custodian is a specific Institutions coordinate in the Bitcoin knowledge graph. In practical terms, it identifies the subject described here: A regulated custody category used in U.S. investment-adviser rules, with legal duties distinct from technical key control. This definition is narrower than promotional usage and should be read together with the implementation, date and evidence attached to the entry.
Qualified custodian is best understood as part of a system rather than as an isolated definition. Its related coordinates show the mechanisms, incentives and historical records that give the term practical meaning.
Qualified custodian belongs to the documented history and social layer around Bitcoin. Primary records can establish what was published, built or decided; motives, influence and later interpretation should remain separate from those verifiable facts.
Understanding Qualified custodian helps distinguish a verifiable Bitcoin mechanism or historical record from slogans, products and market narratives.
Primary or authoritative records make these details checkable: qualified custodian is a legal category under a specified custody regime, not a generic security adjective; status depends on entity type, jurisdiction, registration and the assets and services covered. They should be verified before using the coordinate in analysis.
The practical limit is: being licensed or named a qualified custodian does not insure assets or remove key, operational, insolvency and subcustodian risk; proposals must not be presented as final rules. A definition, office, chart pattern or published claim is not by itself a prediction or Bitcoin consensus rule.
For the clearest picture, read this entry together with Institutional bitcoin custody, Bank bitcoin custody, Spot Bitcoin ETP, Asset segregation, Fiduciary duty, Bitcoin. The reverse links also lead from Institutional bitcoin custody, Bank bitcoin custody, OCC Interpretive Letter 1170, Asset segregation.