← the ledger
Watch it decide · Ledger #8

daily-brief · MarketData+BriefComposer

published· conf ▰▰▰▰▱ 0.86· AUG 28, 2026, 11:01 AM· 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 32794 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": 0.86
  },
  "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": "2026-08-26",
        "name": "FRED · 10-Year Treasury",
        "value": 4.66,
        "seriesId": "DGS10"
      },
      {
        "url": "https://fred.stlouisfed.org/series/DGS2",
        "asOf": "2026-08-26",
        "name": "FRED · 2-Year Treasury",
        "value": 4.19,
        "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": "2026-08-27",
        "name": "FRED · S&P 500",
        "value": 7730.99,
        "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": "2026-08-26",
        "unit": "percent",
        "label": "10-Year Treasury",
        "value": 4.66,
        "prevAsOf": "2026-08-25",
        "seriesId": "DGS10",
        "prevValue": 4.64
      },
      {
        "asOf": "2026-08-26",
        "unit": "percent",
        "label": "2-Year Treasury",
        "value": 4.19,
        "prevAsOf": "2026-08-25",
        "seriesId": "DGS2",
        "prevValue": 4.17
      },
      {
        "asOf": "2026-07-01",
        "unit": "percent",
        "label": "Fed Funds Rate",
        "value": 3.63,
        "prevAsOf": "2026-06-01",
        "seriesId": "FEDFUNDS",
        "prevValue": 3.63
      },
      {
        "asOf": "2026-08-27",
        "unit": "index",
        "label": "S&P 500",
        "value": 7730.99,
        "prevAsOf": "2026-08-26",
        "seriesId": "SP500",
        "prevValue": 7675.7
      }
    ]
  },
  "briefId": 165,
  "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 rate: 6.66%, up 1 bp."
              },
              {
                "kind": "Stat",
                "label": "10-Year Treasury",
                "value": "4.66%",
                "caption": "10-year Treasury: 4.66%, up 2 bps."
              },
              {
                "kind": "Stat",
                "label": "2-Year Treasury",
                "value": "4.19%",
                "caption": "2-year Treasury: 4.19%, up 2 bps."
              },
              {
                "kind": "Stat",
                "label": "Fed Funds Rate",
                "value": "3.63%",
                "caption": "Fed funds rate: 3.63%, unchanged since July 1."
              },
              {
                "kind": "Stat",
                "label": "S&P 500",
                "value": "7,730.99"
              }
            ]
          },
          {
            "kind": "Text",
            "text": "What it means for your shop",
            "emphasis": "mono"
          },
          {
            "kind": "Callout",
            "text": "The stable 200 bp mortgage-Treasury spread signals steady servicing economics and consistent refi disincentives; with the 10Y–2Y curve at only 47 bps, steepening risk remains limited unless Fed-cut expectations shift.",
            "tone": "info"
          }
        ]
      },
      "title": "markets & rates"
    },
    "label": "autonomous · AI-generated",
    "usage": {
      "promptTokens": 2060,
      "completionTokens": 250
    },
    "summary": "10Y yields ticked up 2 bps while 30-year mortgages rose just 1 bp, keeping the mortgage-Treasury spread anchored at 200 bps.",
    "headline": "Mortgage-Treasury Spread Holds Firm as Short Rates Stabilize",
    "disclaimer": "Not financial advice. Generated autonomously from public Federal Reserve data."
  },
  "artifactId": 167
}
05

Proof — the hash-chained record

seq #8
row_hash 1f1f0c7c58254484069ce98503b7da7f4746cce1d3bf94c40ece69832cf27cd9
prev_hash fc3d7343b28397b6def73c1da9c3528585031b83e202aa3de75efaa03142c748

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.