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Proof: Haze in Singapore: Air quality in all 5 regions unhealthy, PM2.5 readings elevated across island

The record — the exact bytes that were hashed

{"first_seen":"2026-09-28T23:31:01Z","headline":"Haze in Singapore: Air quality in all 5 regions unhealthy, PM2.5 readings elevated across island","kind":"front-page-headline","rank":1,"source":"straitstimes","url":"https://www.straitstimes.com/singapore/haze-in-singapore-air-quality-in-4-of-5-regions-unhealthy-pm2-5-readings-elevated-across-island?ref=top-stories","v":1}

Download headline-8f8440caaa46.json

SHA-256

8f8440caaa461682f38723a1a89367edcfdd20153e9b85b7ecd444f88398f2a9

OpenTimestamps

Confirmed in Bitcoin block 969067, mined 2026-09-28 23:56 UTC.

Download headline-8f8440caaa46.json.ots

Wayback Machine

• The record pageCaptured 2026-09-28 23:32 UTC — view the capture.
• The story pageCaptured 2026-09-28 23:14 UTC — view the capture.

Check it yourself — none of this needs this site

1. Hash the record: sha256sum headline-8f8440caaa46.json prints 8f8440caaa461682f38723a1a89367edcfdd20153e9b85b7ecd444f88398f2a9. Its first twelve characters are the end of this record's address.
2. Drop headline-8f8440caaa46.json and headline-8f8440caaa46.json.ots onto opentimestamps.org, which checks the receipt against the Bitcoin block chain. Or, with the OpenTimestamps client and a Bitcoin node: ots verify headline-8f8440caaa46.json.ots (ots upgrade first while the receipt is pending).
3. Open the Wayback Machine's captures above: the capture of the record page shows this hash as it stood then, and the capture of the story page shows the newsroom's own page.

Sealed automatically, 1 min after it was first seen.