For the partners at 2150. About the operational layer beneath the megatonne — how the Urban Stack becomes queryable rather than reconciled.
Fund II closed 109 days ago. Seven of twenty portcos signed. Thirteen still to source over the deployment window. The first-cohort regime sets the precedent — and SFDR 2.0 lands for entry in 2028, inside the cycle.
cases/2150 · audit_chain_v1 · methodology_overlay_v1
One published symbol. One coined ambition. One discipline the firm names in its founder's bio. The Urban Stack now needs intelligence over it.
2150 publishes the Urban Stack — the proprietary symbol the firm coined. Eight sectors at minimum: energy, cooling, lower-carbon cement, biodiversity monitoring, industrial heat, critical minerals, urban mobility, circular economy. Christian Hernandez coined gigacorn alongside it — a portco capable of mitigating one gigaton CO2e annually. The bio names the discipline: he built "systems of intelligence in the early days of big data." Twenty-seven portcos in, eleven-plus native data taxonomies deep, the Urban Stack now needs that intelligence over it.
Heat: process emissions and kWh-equivalent. Cement: kg CO2/m³ and embodied/operational split. Cooling: refrigerant-equivalent and kWh per kelvin-delta. Mobility: g CO2/km avoided and modal-shift cohorts. DAC: tons CO2/year and $/ton. These taxonomies do not natively reconcile — cross-stack questions require manual quarterly reconciliation, and the annual Article 9 disclosure composes from it.
- SFDR review proposal COM(2025) 841 final (20 Nov 2025) remaps Article 9 for 2028 entry — inside Fund II's deployment cycle.
- Three new categories, each 70% threshold, product-level PAI.
- Hernandez has publicly framed 2150 as "one of the first VC funds to choose Article 9." Reputational asymmetry on downgrade is sharp.
Four archetype rows. Each row carries its native unit. The aggregate megatonne claim composes across them — and the boundary between rows is the operational reconciliation problem.
FIG. ── PER-PORTCO EVIDENCE REGIME · 4 URBAN STACK ARCHETYPES × NATIVE UNIT · VERIFICATION CLASS · CROSS-STACK TOUCHPOINTS
What is new is the reconstruction burden. Same calculations, three readers — regulator, LP, 2027 auditor — all needing one source of truth.
Two primitives sit underneath the Urban Stack — audit chain and methodology overlay. The published Stack stays public. The internal layer makes it survive 27 portcos and the next thirteen.
Every impact-evidence event a portco produces — a third-party LCA delivered, a facility telemetry batch logged, an EPD certified, a substitution-ratio reported, a fleet kilometre captured, a CO2/ton claim updated — appends to a hash-chained log carrying six tags per event: sector, native impact unit, canonical conversion to tCO2e, verification class, SFDR 2.0 remap target, and cross-stack tag for sector-spanning queries. Append-only, never-deletable.
Cross-stack queries — aggregate megatonne mitigation, $/tCO2 by sector, double-count detection across boundary portcos — become queries against the chain rather than quarterly manual reconciliation. SFDR 2.0 remap in 2028 does not require re-derivation; the tag is already there at event time.
Each portco gets a regime spec written as inspectable YAML — sector, native impact taxonomy, canonical conversion rules to tCO2e and SDG indicators, verification class, cross-stack tags, SFDR v1 classification, SFDR v2 remap target, and green-premium status — Hernandez's "cheaper, faster, better, cheaper to own over time" discipline encoded as a binary field on the spec.
Term-sheet judgments, impact methodology, and data discipline are encoded once and inspectable thereafter. The next portco entering Fund II inherits the overlay structure but writes its own taxonomy spec. The system of intelligence Hernandez once built in another context now sits over the Urban Stack his fund operates inside.
Together, the AUDIT CHAIN names what evidence exists; the OVERLAY names what the evidence is supposed to show. Same source of truth, two different reading frames — one for the supervisor running the 70% threshold, one for the LP.
FIG. ── AUDIT CHAIN · IMPACT-EVENT BLOCKS · SIX TAGS PER EVENT · APPEND-ONLY · NEVER-DELETABLE
FIG. ── URBAN STACK COMPOSITION · NATIVE UNITS → CANONICAL tCO2e → SFDR 2.0 REMAP TARGETS
27 portcos. 11+ taxonomies. The Urban Stack composes across them. Pressure-test the regime.
The substrate answers in its own voice — the same primitive we'd install on one Urban Stack sector and one real portco. Not a demo. The actual reasoning surface.
STREAMING · κ ≥ 0.85 · ANONYMITY HOLDS · CITATIONS BY DEFAULT
One Urban Stack sector. One real portco's evidence regime. Audit-chain stub. One overlay YAML the partners can mark up.
We pick one Urban Stack sector — industrial heat, lower-carbon materials, cooling, or mobility — and one real portco from it. We deliver an audit-chain stub instrumented with the six event tags, plus one methodology-overlay YAML for that portco. The partners read it, mark it up, and decide whether the regime extends to portcos eight through twenty.
If relevant, I can send a short async questionnaire — no call needed — and build a no-charge synthetic-data Phase 0 PoC "2150 AI OS". Within two weeks, replay one Urban Stack portco's evidence chain against the 2027 first full-year Article 9 disclosure before the supervisor starts citing it at the SFDR 2.0 entry.
Article 9 carbon-math at €204M · LCA chains hardened as auditable substrate.
LCA methodology · evidence beneath the model · Article 9 climate-tech at scale.
Article 9 consumer impact at £80M · per-portco evidence reconstructability under SFDR 2.0.