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Watch it decide · Ledger #20

daily-brief · MarketData+BriefComposer

published· conf ▰▰▰▰▰ 0.92· AUG 30, 2026, 9:03 PM· anthropic/claude-haiku-4.5· constitution v5

01

Inputs — what it was given

{}
02

Sources read — 5 cited

03

The gate — deterministic verdict

Decision: published · computed in 6711 ms

5/5 series, all sourced and fresh.

04

Outputs — what it produced

{
  "gate": {
    "pass": true,
    "reason": "5/5 series, all sourced and fresh.",
    "confidence": 0.92
  },
  "market": {
    "sources": [
      {
        "url": "https://fred.stlouisfed.org/series/MORTGAGE30US",
        "asOf": "2026-08-27",
        "name": "FRED · 30-Year Fixed Mortgage",
        "value": 6.66,
        "seriesId": "MORTGAGE30US"
      },
      {
        "url": "https://fred.stlouisfed.org/series/DGS10",
        "asOf": "2026-08-27",
        "name": "FRED · 10-Year Treasury",
        "value": 4.67,
        "seriesId": "DGS10"
      },
      {
        "url": "https://fred.stlouisfed.org/series/DGS2",
        "asOf": "2026-08-27",
        "name": "FRED · 2-Year Treasury",
        "value": 4.2,
        "seriesId": "DGS2"
      },
      {
        "url": "https://fred.stlouisfed.org/series/FEDFUNDS",
        "asOf": "2026-07-01",
        "name": "FRED · Fed Funds Rate",
        "value": 3.63,
        "seriesId": "FEDFUNDS"
      },
      {
        "url": "https://fred.stlouisfed.org/series/SP500",
        "asOf": "2026-08-28",
        "name": "FRED · S&P 500",
        "value": 7711.76,
        "seriesId": "SP500"
      }
    ],
    "readings": [
      {
        "asOf": "2026-08-27",
        "unit": "percent",
        "label": "30-Year Fixed Mortgage",
        "value": 6.66,
        "prevAsOf": "2026-08-20",
        "seriesId": "MORTGAGE30US",
        "prevValue": 6.65
      },
      {
        "asOf": "2026-08-27",
        "unit": "percent",
        "label": "10-Year Treasury",
        "value": 4.67,
        "prevAsOf": "2026-08-26",
        "seriesId": "DGS10",
        "prevValue": 4.66
      },
      {
        "asOf": "2026-08-27",
        "unit": "percent",
        "label": "2-Year Treasury",
        "value": 4.2,
        "prevAsOf": "2026-08-26",
        "seriesId": "DGS2",
        "prevValue": 4.19
      },
      {
        "asOf": "2026-07-01",
        "unit": "percent",
        "label": "Fed Funds Rate",
        "value": 3.63,
        "prevAsOf": "2026-06-01",
        "seriesId": "FEDFUNDS",
        "prevValue": 3.63
      },
      {
        "asOf": "2026-08-28",
        "unit": "index",
        "label": "S&P 500",
        "value": 7711.76,
        "prevAsOf": "2026-08-27",
        "seriesId": "SP500",
        "prevValue": 7730.99
      }
    ]
  },
  "briefId": 173,
  "composed": {
    "spec": {
      "root": {
        "kind": "Stack",
        "children": [
          {
            "cols": 3,
            "kind": "Grid",
            "children": [
              {
                "kind": "Stat",
                "label": "30-Year Fixed Mortgage",
                "value": "6.66%",
                "caption": "30-year fixed mortgage rose 1 bp to 6.66%, holding the 199 bp spread to 10-year Treasuries."
              },
              {
                "kind": "Stat",
                "label": "10-Year Treasury",
                "value": "4.67%",
                "caption": "10-year Treasury gained 1 bp to 4.67%, anchoring the mortgage premium at an elevated level."
              },
              {
                "kind": "Stat",
                "label": "2-Year Treasury",
                "value": "4.2%",
                "caption": "2-year Treasury rose 1 bp to 4.2%, pushing the 10–2 spread to just 47 bps in a persistently flat regime."
              },
              {
                "kind": "Stat",
                "label": "Fed Funds Rate",
                "value": "3.63%",
                "caption": "Fed funds rate remained flat at 3.63%, offering no new tailwind for rate cuts or refi catalysts."
              },
              {
                "kind": "Stat",
                "label": "S&P 500",
                "value": "7,711.76",
                "caption": "S&P 500 closed at 7,711.76, with equity stability providing no disruptive macro signal to rates."
              }
            ]
          },
          {
            "kind": "Text",
            "text": "What it means for your shop",
            "emphasis": "mono"
          },
          {
            "kind": "Callout",
            "text": "The stubborn 199 bp mortgage–10y spread signals lenders remain selective on margin despite a flattening curve; refi incentive remains muted at 6.66%, limiting volume upside and keeping prepay risk contained for MSR holders.",
            "tone": "info"
          }
        ]
      },
      "title": "markets & rates"
    },
    "label": "autonomous · AI-generated",
    "usage": {
      "promptTokens": 2062,
      "completionTokens": 349
    },
    "summary": "All three core rates ticked 1 bp higher on the day, keeping the 30y mortgage–10y spread locked at 199 bps while the 10–2 curve remains historically compressed.",
    "headline": "Mortgage Spread Holds Steady as Curve Flattens to 47 Bps",
    "disclaimer": "Not financial advice. Generated autonomously from public Federal Reserve data."
  },
  "artifactId": 175
}
05

Proof — the hash-chained record

seq #20
row_hash e1deaf5fa6e45242a37810bdcfb2b575870302ca212f55f73b3fa76155698793
prev_hash 972ef27de130344b4cfdf872e6166c1eba27375c91bc30c2d30652e382ef0da6

This exact row, with its canonical preimage, is public at /api/ledger/export. Recompute its hash with the standalone verifier — it shares no code with this site. The chain head is timestamped into Bitcoin.

Evidence or it doesn't ship.