OT-2026-000000721
Publication integrity record
Clean head, system and method for use in cleaning a fluid conduit
This page is the evidence record. It changes as evidence arrives: a trusted timestamp, an independent retrieval, a custody deposit. The disclosure itself (/p/OT-2026-000000721) never changes.
Identity and time
| Publication number | OT-2026-000000721 · never reused |
|---|---|
| Internal UUID | 01a0a673-bd29-7347-b248-1ef1510ab67c · UUIDv7, RFC 9562 |
| Publication timestamp | 2026-09-15T19:03:18.058287Z Recorded by the publication infrastructure in UTC, not taken from the submission. |
| Canonical URL | https://opentechnical.org/p/OT-2026-000000721 |
| Status | PUBLIC |
Content hashes
| Canonical text | 87f1ff586fd4cc619caddca5f7f445d0cbc2575dcdbc4b7908071e294382f753 |
|---|---|
| Markdown | ce95c3cb7a9dba4cc0fe23083461cc6327e492774866efd0f55da9ce7c7c97c6 |
| Publication page | c57f396da68210b530b4d1c15fcbdd5e7864c56070fac5f00b3c3de4926946cf |
| Manifest | c75299279815e6e322bc7b17817bf13056c7d3f0c2a5774e0f348541540fc921 |
SHA-256, lowercase hex, over the exact bytes of each published file. Every figure is hashed individually in the manifest.
Manifest signature
| Algorithm | Ed25519 · key
OT-SIGN-2026-01 · Verified |
|---|---|
| Signature | PhxGTfKcT3hrB2EkarC2ETnTA+0NObppaxoeWFLtKThQt0vrSTICOEHr/YxaR8kZGnKRXnYN16mBZ+7HeW4yCA== |
| Public key | /integrity/keys · every key we have ever used stays published |
Trusted external timestamp
| timestamp.digicert.com | 2026-09-15T19:07:03Z batch OT-TS-2026-W38-001 · RFC 3161 token · inclusion proof root 6369baadb1a246009d149835804d20ba... |
|---|
Independent retrieval
| 2026-09-17T00:41:06.687539Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721observed c57f396da68210b530b4d1c15fcbdd5e...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
|---|---|
| 2026-09-17T00:41:06.538108Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/manifest.jsonobserved c75299279815e6e322bc7b17817bf130...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-17T00:41:06.362428Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/publication.mdobserved ce95c3cb7a9dba4cc0fe23083461cc63...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-17T00:41:06.146600Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/publication.txtobserved 87f1ff586fd4cc619caddca5f7f445d0...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-16T16:42:32.681284Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721observed c57f396da68210b530b4d1c15fcbdd5e...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-16T16:42:32.485410Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/manifest.jsonobserved c75299279815e6e322bc7b17817bf130...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-16T16:42:32.326022Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/publication.mdobserved ce95c3cb7a9dba4cc0fe23083461cc63...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
| 2026-09-16T16:42:32.157258Z | HTTP 200 · MATCHhttps://opentechnical.org/p/OT-2026-000000721/publication.txtobserved 87f1ff586fd4cc619caddca5f7f445d0...fetched by grabo-systems from 34.44.131.203, which resolved the name to 35.239.157.139 |
Requested from infrastructure separate from the publication system, over the public internet, with no credential. A MATCH means an ordinary internet client could fetch the publication and received exactly the bytes recorded above.
Independent archive
| External archive | Pending Canonical URLs are submitted to an independent archive in batches. |
|---|
A capture held by an outside archive is evidence that does not depend on OpenTechnical continuing to exist. It supplements the records above; it does not replace them.
Third-party custody
| OT-CUSTODY-2026-W38 | OpenTechnical-Custody-2026-W38.tar.zstf2fc69d02142424a578267e5e3a6d3bb... · 402,218,449 bytes · held by held on site pending an external custodian · retention permanent |
|---|