The Simulation Ledger: Every Experiment, Scored and Filed
Simulation only compounds in value if its results are kept. The simulation ledger is the record of every experiment: the model, the assumptions (fidelity budget), the run configuration, the coherence score, the economic outcome, and the verdict. The ledger is the memory of the sandbox — and it is what turns a series of one-off tests into an accumulated body of evidence.
What the ledger records
Each entry has a fixed shape: model ID, version, world definition, fidelity budget (SIM-8), seed range, run count, coherence score (SIM-3), economic outcome, gate results (SIM-7), and verdict — promoted, returned to sandbox, or abandoned. The shape is fixed so the ledger is queryable: which models failed the economic gate, which assumptions were load-bearing, which fidelity gaps flipped an answer. The ledger is to the simulation layer what the master index is to the corpus — the queryable memory.
The ledger as the anti-placebo
The ledger is the antidote to the simulation placebo: it makes the claim “we tested it” checkable. A model with a ledger entry and a promotion receipt has evidence; a model without one has an anecdote. The audit layer (S7.7, S7.15) can verify the receipt against the ledger the same way it verifies agent actions against the log. The ledger is where the simulation layer earns its place in the trust chain.
From ledger to knowledge
The ledger feeds the research track (S10): each batch of experiments generates findings about the business models, the customers, and the stack itself. The findings flow into the standing gap list (S10-22) and the bridge ledger — which simulation results imply which missing articles. The simulation ledger is not an archive; it is the research data of the sovereign stack, and it is the source of the next round’s evidence.
Grounded in the SIM series, the audit-layer work (S7.7, S7.15), the S10 research track, and the MASTER-INDEX-BRIDGE discipline. Ninth article in the Round D simulation track.
