# C1180 — Cost the first block’s explanatory gains

## Question

Which results reduce a declared source model and which are consistency or new encodings?

## Inputs

```json
{}
```

## Sources

```json
[
  "C1132–C1179",
  "Strategy §§1,6"
]
```

## Opened utc

2026-09-28T05:14:14.796722+00:00

## Results

```json
{
  "first_block_cost_ledger": {
    "path": "model/block1_explanation_cost_ledger.json",
    "sha256": "b8f39e95f57c25b33b0f24a4fc1a0964f14851020f0058316f5ca5dd00fc2a21",
    "bytes": 1408
  },
  "explanatory_families": 8
}
```

## Finding

The block advances the source-generation question through located threshold behavior and a complete row-operation grammar. It leaves inherited magnitudes and source roles visible, rejects rank-only scoring, and sets up a full-genealogy test.

## Reassessment

Close the50-action checkpoint, then reread every section of the Strategy before selecting C1182.

## Checks

```json
{
  "eight_families": true,
  "no_new_endpoint_search": true,
  "cost_present": true
}
```

## Closed utc

2026-09-28T05:14:14.797398+00:00

## Record provenance

Exact record hash: `ddf1b2ce0bb6a0cb0939fcf8581f55a6a9ae1f50b0b3231290fba9fbb054d798`

Source journal: `Research_Cycles/C1132_C1431_Recovered/journal.json`