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as4-411/docs/protocols/dtc.md
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Initial commit: AS4/411 directory and discovery service for Sankofa Marketplace
Co-authored-by: Cursor <cursoragent@cursor.com>
2026-02-08 08:44:20 -08:00

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DTC / Digital Securities (DTCC Ecosystem)

Overview

DTC and DTC-related messaging cover securities post-trade and custody. Participants include broker-dealers, custodian banks, and clearing members. Directory use is often client-owned configuration; public directory availability is limited.

Scope

Identity mapping (LEI, BIC, participant IDs) plus contractual endpoint profiles. Optional import from customer-managed config (files or APIs). Do not claim automated discovery unless an authoritative or licensed directory feed exists. Prefer routing artifacts and admin API for participant/endpoint maps.

Identifier Taxonomy

Type Description Scope
lei Legal Entity Identifier Public/registry
bic Bank Identifier Code (SWIFT) Market identifier
dtc.participantId DTC/internal participant ID Tenant/confidential
dtc.accountId Custody/account ID (proprietary) Tenant/confidential

Historical: duns (D&B) where still in use.

Endpoint Profiles

Profile Protocol Description
dtcc-mq MQ DTCC connectivity / message system
sftp.* SFTP File-based instructions
https.* HTTPS/AS2/AS4 API or EDI over HTTP

Address format is vendor- or channel-specific (queue name, path, URL).

Capability Taxonomy

  • securities.settlement.* — Settlement instructions and messages.
  • securities.corpactions.* — Corporate actions.
  • securities.assetservices.* — Asset servicing.

Used in resolution to match service context (e.g. request for settlement instructions).

Tenancy and Confidentiality

  • Strong tenant scoping: DTC and account identifiers are frequently confidential. Resolution must be scoped by tenant; no cross-tenant leakage.
  • Prefer integration via client-owned configuration: Ingest from client-provided files or APIs rather than assuming a public directory. Use routing artifacts and admin API for participant/endpoint maps.
  • Audit: All access to DTC-related participant and endpoint data must be audited.