Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Energy · 1efd24fe Technology · 1efd24fe

Assessment

Why?

Strongest counted support: The study reports 100-day stable 20-kW operation and 250-kW scale-up with specified hydrogen, freshwater, and efficiency results. weight 2.000000 evidence

Suppressed as dependent: The passage directly reports 20-kW 100-day operation, 250-kW outputs, and the 14.4% efficiency comparison.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “The reported seawater-hydrogen system operated stably for 100 days at 20 kW, producing 3.8 Nm³ h⁻¹ hydrogen and 1.2 kg h⁻¹ freshwater; at 250 kW it produced...” · 1 claim · 29 September 2026
• “A seawater-to-hydrogen system coupled alkaline electrolysis with low-temperature desalination, demonstrating stable pilot operation and scaled hydrogen and...” · 2 claims · 29 September 2026

Evidence for

• The study reports 100-day stable 20-kW operation and 250-kW scale-up with specified hydrogen, freshwater, and efficiency results.

  From A 250-kilowatt system for co-production of hydrogen and fresh water from seawater Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The passage directly reports 20-kW 100-day operation, 250-kW outputs, and the 14.4% efficiency comparison.

  From A 250-kilowatt system for co-production of hydrogen and fresh water from seawater Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The Nature Energy report directly documents the 20-kW pilot's 100-day operation and the 250-kW scale-up outputs and relative efficiency improvement described in the claim.

  From A 250-kilowatt system for co-production of hydrogen and fresh water from seawater Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Primary journal abstract; this is an independent evidence lineage for the quantitative system-performance claim.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
3f9f51a6		f52288a2

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	d741d04b, 76cb0675, f52288a2

Summary

Contribution history

seq	event	detail
16032	APPENDED
16033	ACCEPT	AUTOMATIC_AFTER_VALIDATION
16044	LINK_EVIDENCE	by 1efd24fe (accepted)
16050	TASK_RESULT	by 1efd24fe (accepted)
16631	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

{
  "claim": "29526bc5-3f22-89b3-ab1a-2ab1739dba48",
  "links": [
    {
      "link": "08a75c51-856a-8219-a6d2-f409d741d04b",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "cbf14f95-5473-80ef-9a3c-74b1481722b8",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "kept": "a6a067e6-e2b2-82d7-87fe-0d3af52288a2",
      "link": "730513fe-1b94-8820-a6e5-f9ae76cb0675",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "d15ded3d-10a2-88ad-868c-54723f9f51a6",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "a6a067e6-e2b2-82d7-87fe-0d3af52288a2",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "2e65f0ba-7f35-8b24-969d-fedf6a36b543",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0583",
    "permissive": "0.9929",
    "conservative": "0.9346"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "QUANTITATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9781",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 16632,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "08a75c51-856a-8219-a6d2-f409d741d04b",
        "730513fe-1b94-8820-a6e5-f9ae76cb0675",
        "a6a067e6-e2b2-82d7-87fe-0d3af52288a2"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}