Demo · Two governance regimes
Copilot vs the contract
Same cell, same instant. Copilot says PASS. The truth layer says FAIL. Drag the scrubber and watch where artifact governance ends and contract governance begins.
Artifact attestation
- Formula validity=Metrics!B3 parses and resolves
- Reference integrityCell B3 on sheet Metrics exists
- Transformation log3 named steps, no errors
- Workbook provenanceTraced to source sheet within workbook
- Definition contractNot observed (governs upstream of workbook)
Cell B3 = $1,242,000,000
Copilot: PASS. Truth Layer: FAIL.
Same cell, same instant.
Three weeks later. The QBR opens.
Contract attestation
- LineageUpstream definition changed Apr 14, downstream not refreshed
- FreshnessLast partition 9h ago
- OwnershipRevenue Operations
- Discoverability
- UsageConsumed by 37 downstream cells
- Consumption confidenceDefinition mismatch outweighs other signals
The QBR opens. The headline number on the slide is the value of cell B3. The workbook is intact. Every formula resolves. Every reference points where it should. Copilot, asked to verify, returns green across the board.
Three weeks ago, on April 14, the upstream definition of EMEA revenue changed. Not the formula. Not the column. The definition. The dimension that aggregates revenue into the EMEA bucket was split, and downstream consumers were not refreshed. The cell still resolves. The number is exactly wrong.
Copilot governs the artifact. Formula validity. Reference integrity. Transformation traceability. Workbook provenance. Everything Microsoft has shipped here works, and works well, inside the workbook boundary. The boundary is the issue. The contract that produced the input lives upstream of the workbook, where Copilot cannot see.
The truth layer governs the contract. Lineage knows the upstream definition shifted on April 14. Consumption confidence collapses because the signals that justified trust at registration time no longer hold. The composite drops to 0.42. The cell is flagged.
Two governance regimes operate on the same cell at the same instant and disagree. Both are correct within their scope. The decision the QBR is about to make depends on which one the room hears first.
Justin Nixon · The truth layer · 2026