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No. 4 of 6 · Diamonds in the rough · 9 October 2026

Etchv, an API for invisible watermarks in images, PDFs and short videos

agurha launched Etchv on Show HN on 8 October. The post says it embeds an invisible watermark in images, PDFs or short videos, and that on 208 test photos the mark survived the shrinking and compression a social feed or chat app applies every time, while tiny thumbnails mostly killed it. The post also says someone who knows what they are doing can always remove the mark.

Score 4 of 9: new 3 of 3, momentum 0 of 3, evidence 1 of 3. Momentum measured: One read only (4 points at 2026-10-09T15:19:13Z), so not measured and scored 0.

Who started it
agurha on Hacker News, 8 October, writing as the makers; the earliest trace we found
How we found it
Hacker News search for watermark stories; one route only

Why it matters A small team publishing where its mark fails, as well as where it holds, gives others something concrete to test. We have not tested it, and so far it has been noticed on one platform.

The receipt

7 facts: 1 SAW, 4 STATED, 2 INFER. SAW: fetched and read by us. STATED: a source’s own claim, quoted. INFER: our reasoning, from the lines it rests on; never fetched. Check any line against its source before you repeat it.

  1. SAW Show HN: Etchv, API for invisible watermarks in images, PDFs and videos, posted by agurha on 8 Oct 2026 at 12:28 UTC: 4 points, 1 comment Read 9 Oct 2026 15:19 UTC.
  2. STATED “Etchv embeds an invisible watermark inside images, PDFs, or short videos that survives modifications like screenshots, format changes, and file compression.” Stated by agurha, in the Show HN post. Read 9 Oct 2026 15:19 UTC.
  3. STATED “On 208 test photos, the watermark survived the shrinking and compression that a social feed or chat app applies, every time. Tiny thumbnails mostly killed it” ... “only 16 of 208 survived.” Stated by agurha, in the Show HN post. Read 9 Oct 2026 15:19 UTC.
  4. STATED “Additionally, someone who knows what they’re doing can always remove the mark.” Stated by agurha, in the Show HN post. Read 9 Oct 2026 15:19 UTC.
  5. STATED “We offer an API with official SDKs in six languages, as well as an MCP server” Stated by agurha, in the Show HN post. Read 9 Oct 2026 15:19 UTC.
  6. INFER Our reading: the post is written in the makers’ own voice, so we take agurha to be one of them. We found Etchv on no other platform, so this is one route only. Rests on lines 1, 2 and 5 of this receipt. Not fetched.
  7. INFER Our reading: publishing where the mark fails, as well as where it holds, gives outsiders a concrete claim to test. We have not tested it. Rests on lines 3 and 4 of this receipt. Not fetched.

Sources

Where it was published

First published on in the Edition of 9 October 2026, which is kept as it was published: its stories, facts and scores never change. See it in the 3D map, where your agent can take you to it.

For agents: this story’s id is 2026-10-09/etchv. Through our agent door, get_story gives it with every receipt; llms.txt says how. Seen something we missed? Send a tip or a correction.

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