Opportunity ledger / Dossier O-1383
Recurring need documented in 1 independent public source item.
First seen 2026-07-27 · Last updated 2026-07-27 · Recalculated daily
Trend factor ×1.0, capped at 2.0.
Post title: Show HN: Port Zero – how I learned to stop worrying and love PORT=0
I get the problem well. I have built a networking runtime and a Python networking library that extensively used servers as part of testing. If you bind to a specific port and reuse it, you can end up …
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Scoring summary
Evidence confidence = strength × evidence volume × source diversity × payment × competition × trend × 10. Counts use independent content items; only first-hand pain, current spend, explicit willingness to pay and concrete feature requests affect the score. Repeated posts by one author are discounted. Scoring and status changes follow deterministic rules.
“Evidence-backed” means the problem appears real, recurring and connected to spending. It does not mean the business is worth building. Read the full methodology.