Wave 17 · EU/UK/CH T+1 & CSDR Settlement Discipline · OpenChainGraph v0.4

EU/UK/CH T+1 & CSDR Settlement Discipline

End-to-end settlement discipline computational layer. Eight tools (ART-77–84) across 8 sd-* chains cover the full CSDR Art 7 penalty lifecycle and T+1 readiness journey: fail prediction, SSI conformance, allocation/affirmation timing against the 23:00 CET cutoff (binding Dec 2026), ISO 20022 sese/semt message linting, CSDR Refit buy-in exposure modeling, and settlement efficiency KPI aggregation. All regulatory rates, timing rules, and ISO 20022 message scope are baked into kernels citing primary sources. ISO 20022 scope guard: sese/semt only — pacs/camt remain with cbpr-cutover/rca-03.

CSDR Art 7 Cash Penalties IN FORCE ESMA CSDR SDR RTS — 13 Oct 2025 Allocation/Affirmation 23:00 CET — Dec 2026 EU/UK/CH T+1 Go-Live — 11 Oct 2027 CSDR Refit Buy-In — Delegated Acts Pending ESMA 97.5% Settlement Rate Benchmark ISO 20022 sese/semt (no pacs/camt) Wave 17 · Settlement Discipline

✅ DO NOW — CSDR Art 7 cash penalties are IN FORCE. Penalty rates: equities/illiquid 1.00 bp/day, SSA bonds 0.50 bp/day, other bonds 0.50 bp/day, ETFs 0.50 bp/day. ESMA CSDR SDR RTS (13 Oct 2025, ESMA74-2119945926-3430) clarifies penalty calculation rules. ESMA EU settlement rate benchmark: ~97.5%. Start measuring settlement efficiency against this benchmark NOW. Run settlement-discipline-fit to assess your T+1 readiness posture.

⚠ PREPARE-AHEAD — Three T+1 obligations are mandatory by confirmed dates: (1) Allocation/confirmation by 23:00 CET trade-date + machine-readable formats from Dec 2026 (ESMA CSDR SDR RTS). (2) EU/UK/CH coordinated T+1 settlement go-live: 11 Oct 2027 (EU: CSDR amending text OJ 14 Oct 2025; UK: FCA; CH: SIX). (3) CSD T+1 operational changes aligned to the coordinated go-live. Act now — 16 months to 11 Oct 2027.

⚠ PENDING DELEGATED ACTS — CSDR Refit mandatory buy-in provisions (Reg. 2023/2845, adopted 27 Nov 2023) are suspended pending ESMA delegated acts (not yet in force as of Jun 2026). The settlement-discipline-buyin chain and ART-83 model buy-in exposure for planning purposes only. Verify current adoption status before relying on any buy-in trigger dates.

EDUCATIONAL — All outputs are decision-support drafts. Not regulatory computations. Verify CSDR penalty rates, T+1 dates, and allocation-timing rules against the official ESMA CSDR SDR RTS (ESMA74-2119945926-3430) and the EU T+1 legislation. ISO 20022 sese/semt scope limited to settlement instruction and statement messages — pacs/camt not in scope.

Entry point — settlement-discipline-fit

Always start here. Diagnoses T+1 and CSDR settlement discipline readiness across 6 dimensions and routes to the appropriate sd-* chain.

ART-77 · D0 · agent_guardrail_mandate

T+1 Settlement Readiness Diagnostic

D0 router. Scores readiness across 6 weighted dimensions: CSDR penalty exposure, fail prediction, SSI data quality, allocation/affirmation timing, ISO 20022 message conformance, and operational T+1 readiness. Dual deadlines: Dec 2026 (allocation timing) and 11 Oct 2027 (T+1 go-live). Routes to sd-* chains.

run_t1_readiness_diagnostic PREPARE-AHEAD — 11 Oct 2027

CSDR penalties, fail prediction & SSI (settlement-discipline-penalty, settlement-discipline-failpredict, settlement-discipline-ssi-hygiene)

The core CSDR Art 7 enforcement layer: penalty calculation, pre-fail prediction, and SSI golden-source hygiene.

ART-78 · W-A · compliance_mandate

CSDR Cash Penalty Calculator

Flagship CSDR tool. Computes daily cash penalties per instruction fail: equities/illiquid 1.00 bp/day, SSA bonds 0.50 bp/day, ETFs 0.50 bp/day. Rate table version CSDR-RTS-2025-10 baked (ESMA CSDR SDR RTS 13 Oct 2025). Batch processing with per-instruction breakdown.

calculate_csdr_penalty IN FORCE — CSDR Art 7

ART-79 · W-B · model_governance

Settlement Fail Predictor

Pre-fail risk scoring using SSI match status, deadline proximity, instruction type, counterparty tier, and dry-run settlement result. Feature weights baked from ESMA settlement statistics. Outputs fail_risk score 0–1 and CSDR penalty pre-estimate. Flags HIGH_FAIL_RISK, PENALTY_EXPOSURE.

predict_settlement_fail IN FORCE — CSDR monitoring

ART-80 · W-C · compliance_mandate

SSI Conformance Checker

Validates Standing Settlement Instruction records: BIC/IBAN format, account type vs CSD eligibility, LEI presence, currency×settlement-system compatibility, and staleness threshold (default 90 days). Flags STALE_SSI, INVALID_BIC, CURRENCY_MISMATCH.

check_ssi_conformance IN FORCE — SSI hygiene

Allocation/affirmation, message conformance & buy-in (settlement-discipline-alloc-affirm, settlement-discipline-message-conformance, settlement-discipline-buyin)

The T+1-readiness layer: allocation timing against 23:00 CET cutoff (Dec 2026), ISO 20022 sese/semt message linting, and CSDR Refit buy-in exposure modeling.

ART-81 · W-D · compliance_mandate

Allocation / Affirmation Conformance Checker

Checks allocation and confirmation/affirmation events against the ESMA CSDR SDR RTS 23:00 CET trade-date cutoff and machine-readable format mandate. Per-event pass/fail + batch on-time rate. Binding Dec 2026. Flags LATE_ALLOCATION, LATE_CONFIRMATION, MANUAL_FORMAT.

check_allocation_affirmation BINDING DEC 2026

ART-82 · W-E · compliance_mandate

Securities Settlement Message Linter

Lints ISO 20022 securities settlement messages against sese/semt schema requirements. Scope: sese.023 (settlement instruction), sese.024 (settlement instruction status), semt.044 (intraposition advice). Explicitly rejects pacs/camt (out of scope — owned by cbpr-cutover/rca-03). Flags UNKNOWN_MSG_TYPE, MISSING_SEME, INVALID_ISIN.

lint_securities_settlement_message T+1 — 11 Oct 2027

ART-83 · W-F · compliance_mandate

CSDR Refit Buy-In Exposure Modeler

Models CSDR Refit last-resort mandatory buy-in exposure: extension period by asset class (liquid equity 7 cal-days, gov bond 12, SME/illiquid 22), buy-in cost mark-up (default +5%), and cash-compensation alternative (+10%). Delegated acts pending — planning only. Flags BUYIN_REFORM_PENDING_DELEGATED_ACTS, BUYIN_TRIGGERED.

model_buy_in_exposure Delegated Acts PENDING

Settlement efficiency KPIs — settlement-discipline-audit-pack convergence

Batch-level settlement KPI aggregation and the convergence terminal for the full Wave 17 audit pack.

ART-84 · W-G · model_governance

Settlement Efficiency KPI Aggregator

Aggregates batch settlement data into CSDR/T+1 KPIs: settlement rate (graded A≥99%/B≥97.5%/C≥95%/D≥90%/F), fail rate, on-time allocation rate, SSI golden-source coverage, total CSDR penalty cost, buy-in triggered count, and fail-duration distribution. Benchmarks against ESMA 97.5% baseline. T+1 industry ambition ≥99.5%. Flags SETTLEMENT_RATE_CRITICAL, ON_TIME_ALLOCATION_LOW, SSI_GOLDEN_COVERAGE_LOW.

compute_settlement_efficiency_kpi IN FORCE — ESMA benchmark

Chains — sd-* (8 chains)

Start with settlement-discipline-fit to assess readiness and route. Each chain follows OCG v0.4 stage pattern: pass execution_hash forward, export terminal artifact. Aggregate in settlement-discipline-audit-pack.

settlement-discipline-fit · D0 · 1 node

T+1 Settlement Readiness Diagnostic

Single-node entry point. Scores 6-dimension T+1 readiness, dual-deadline routing (Dec 2026 / 11 Oct 2027), routes to appropriate sd-* chain.

→ ART-77

settlement-discipline-penalty · W-A/B · 3 nodes

CSDR Penalty Lifecycle

Readiness diagnostic (ART-77) → fail predictor (ART-79) → penalty calculator (ART-78). Pre-fail risk screening followed by penalty quantification for any fails that occur.

→ ART-77 · ART-79 · ART-78

settlement-discipline-failpredict · W-B/C · 3 nodes

Fail Prediction & SSI Risk

SSI conformance check (ART-80) → fail prediction (ART-79) → penalty exposure estimate (ART-78). SSI quality feeds directly into fail-risk and penalty pre-estimate.

→ ART-80 · ART-79 · ART-78

settlement-discipline-ssi-hygiene · W-C · 2 nodes

SSI Golden-Source Hygiene

SSI conformance checker (ART-80) → settlement KPI aggregation (ART-84). SSI quality directly drives SSI golden-source coverage KPI.

→ ART-80 · ART-84

settlement-discipline-alloc-affirm · W-D · 3 nodes

Allocation/Affirmation Conformance

Readiness diagnostic (ART-77) → allocation/affirmation conformance (ART-81) → message linting (ART-82). End-to-end 23:00 CET and ISO 20022 conformance chain. Binding Dec 2026.

→ ART-77 · ART-81 · ART-82

settlement-discipline-message-conformance · W-E · 3 nodes

ISO 20022 Message Conformance

Message linter (ART-82) → allocation conformance (ART-81) → KPI aggregation (ART-84). sese/semt message quality + allocation timing conformance → KPI roll-up. T+1 target 11 Oct 2027.

→ ART-82 · ART-81 · ART-84

settlement-discipline-buyin · W-F · 3 nodes

Buy-In Exposure Modeling

Fail predictor (ART-79) → penalty calculator (ART-78) → buy-in exposure modeler (ART-83). Integrates CSDR penalty quantification with Refit buy-in planning exposure. Delegated acts pending — planning only.

→ ART-79 · ART-78 · ART-83

settlement-discipline-audit-pack · Convergence terminal · 3 nodes

Settlement Discipline Audit Pack

Convergence terminal. Aggregates KPIs (ART-84) → Merkle-root integrity (cry-04 + cry-05) → regulator cover memo (ptg-01). Any sd-* chain can feed in. Hash-anchored settlement discipline evidence package.

→ ART-84 · cry-04 + cry-05 · ptg-01

Chain topology

settlement-discipline-fit (ART-77) — D0 entry point ├──→ settlement-discipline-penalty (W-A/B · ART-77/79/78 · CSDR penalty lifecycle) ├──→ settlement-discipline-failpredict (W-B/C · ART-80/79/78 · SSI→fail→penalty) ├──→ settlement-discipline-ssi-hygiene (W-C · ART-80/84 · SSI quality KPI) ├──→ settlement-discipline-alloc-affirm (W-D · ART-77/81/82 · 23:00 CET + sese/semt) ├──→ settlement-discipline-message-conformance (W-E · ART-82/81/84 · ISO 20022 T+1) ├──→ settlement-discipline-buyin (W-F · ART-79/78/83 · buy-in planning) └──→ (all) → settlement-discipline-audit-pack (convergence terminal) ISO 20022 scope guard: ART-82 covers sese.023 / sese.024 / semt.044 ONLY. pacs / camt → cbpr-cutover / rca-03 (separate project, do not cross)

Who runs these chains

The T+1 settlement discipline readiness and CSDR compliance value chain.

Tier 1 — CSDs, CCPs & ICSDs

The infrastructure layer

Euroclear, Clearstream, DTCC Euroclear Settlement (TARGET2-Securities, CREST, SIX SIS). Primary chains: settlement-discipline-penalty (penalty billing), settlement-discipline-alloc-affirm (23:00 CET enforcement), settlement-discipline-audit-pack. T+1 is a CSD-layer infrastructure change by 11 Oct 2027.

Tier 2 — Global custodians & prime brokers

The settlement agents

Banks acting as sub-custodians or prime brokers settling on behalf of clients. Primary chains: settlement-discipline-penalty, settlement-discipline-failpredict, settlement-discipline-ssi-hygiene, settlement-discipline-alloc-affirm. CSDR penalties pass through to clients — settlement efficiency is revenue-protection.

Tier 3 — Asset managers & buy-side firms

The end-investors

Hedge funds, UCITS, and institutional managers receiving CSDR penalty debits. Primary chains: settlement-discipline-fit (readiness assessment), settlement-discipline-failpredict, settlement-discipline-message-conformance (ISO 20022 T+1 readiness). On-time allocation (23:00 CET) is now a buy-side obligation from Dec 2026.

Tier 4 — Post-trade & RegTech vendors

The embedders (M&A-relevant)

Post-trade platforms (Broadridge, DTCC, Murex), settlement optimisation tools, and compliance automation vendors embedding sd-* chains as MCP tools. T+1 is a multi-year infrastructure upgrade cycle — a recurring SaaS engagement opportunity.

CSDR Reg. (EU) 909/2014 Art 7: Cash penalties for settlement fails. Penalty rates: equities/illiquid 1.00 bp/day, SSA bonds 0.50 bp/day, non-SSA bonds 0.50 bp/day. Verify against ESMA CSDR SDR RTS.

ESMA CSDR SDR RTS (13 Oct 2025, ESMA74-2119945926-3430): Final RTS on allocation/confirmation by 23:00 CET trade-date + machine-readable formats, binding Dec 2026. Penalty calculation clarifications. Verify against Official Journal publication.

EU T+1 (CSDR amending text, OJ 14 Oct 2025): EU coordinated T+1 settlement go-live 11 Oct 2027. Aligned with UK (FCA) and Switzerland (SIX). Verify current formal-adoption status and implementation timeline.

CSDR Refit Reg. (EU) 2023/2845 (27 Nov 2023): Mandatory buy-in reform — last-resort after extension period. Suspended pending ESMA delegated acts (not yet in force Jun 2026). Buy-in exposure modeled for planning only — verify current status.

ISO 20022 settlement messages: sese.023 (settlement instruction), sese.024 (instruction status), semt.044 (intraposition advice) only. pacs/camt in scope of separate CBPR+ migration — do not cross-reference.

ESMA CSDR Annual Settlement Efficiency Statistics: ~97.5% EU average settlement rate. T+1 industry ambition ≥99.5% (ESMA T+1 roadmap Jun 2025 — not a regulatory threshold). Verify current edition year.