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Memoria y Resistencia
Reference numberCC-RBTK-VMHA

Certified copy

Record of existence on the internet

Valid and verifiable Sealed on November 6, 2026, 14:36:06 (Central Mexico time)

Memoria y Resistencia hereby certifies que su sistema Turing leyó, el 3 nov 2026, 18:22:09 (hora del centro de México), la nota de lasiemprehabana.com en el enlace público que se indica abajo; que guardó una copia de su contenido; y que la huella digital SHA-256 de esa copia fue sellada por un tercero independiente (FreeTSA, estándar RFC 3161) el 6 nov 2026, 14:36:06 (hora del centro de México). Cualquier cambio en el contenido, por pequeño que sea, cambiaría la huella, y el sello dejaría de coincidir.

I What is certified

Article
lasiemprehabana.com
LA SIEMPRE HABANA - ACTIVIDADES
Original link
http://www.lasiemprehabana.com/eventos-firma-cuevas.html
Read by Turing
November 3, 2026, 18:22:09 (Central Mexico time)
How it was obtained
The link no longer opened: Turing read it from the Internet Archive copy.
Huella SHA-256
77ae98e851f6adcbd63922953f77af4d65b22ded26c757fd272c2607aa23bc74
Turing’s analysis
See the full analysis (100 of 100)

II What it said

El texto completo no se muestra aquí porque es una nota de prensa (sus derechos son del medio) o la fuente de una ficha del Memorial. La huella corresponde al texto completo. Si lo necesitas para un trámite, escríbenos con el folio.

III Chain of custody

  1. 1Huella digital SHA-256Copia exacta de lo que Turing leyó.Done
  2. 2RFC 3161 timestampFreeTSA, un tercero independiente, firmó la huella el 6 nov 2026, 14:36:06 (hora del centro de México).Done
  3. 3OpenTimestamps · BitcoinFingerprint sent to the public calendars; it will be in a Bitcoin block within a few hours.Done
  4. 4Internet ArchiveIt is being saved; the link appears once we confirm it exists.In progress
  5. 5MonitoringNo la encontramos en la última revisión; la volvemos a revisar en unas horas (revisada el 6 nov 2026).In progress

INTERNET ARCHIVE · Wayback Machine

Being saved on archive.org

Turing has already sent it. The link to the copy appears here as soon as we confirm in the archive.org index that it really exists (it may take a few hours).

Why does this make it authentic?
  • It is an independent witness. Internet Archive is a non-profit digital library that has preserved the web since 1996. It has no ties to Memoria y Resistencia or to whoever published the content.
  • The copy is theirs, not ours. Their own system captures it, stores it on their servers and stamps it with their own date and time. Neither we nor the publisher can edit it or change its date.
  • Anyone can verify it. It is at a public web.archive.org address that contains the date. Anyone can open it without asking us and compare it with our copy and its fingerprint.
  • It is a recognized reference. Journalists, researchers and lawyers often cite it to show what a page looked like on a given date.
  • Two witnesses that match. Our timestamp and the Internet Archive copy are made separately. If anyone claimed we altered the copy, the archive.org one would disprove it.

Internet Archive and its logo are trademarks of Internet Archive. We use them only to show where the copy is; this is not an endorsement by them.

IV Value as evidence

It is a technical proof of integrity and date. In Mexico, information recorded in electronic media is recognized as evidence, and its weight depends on the reliability of the method used to create and keep it, on its remaining intact and on its being available for later consultation (Commercial Code, art. 1298-A; Federal Code of Civil Procedure, art. 210-A; National Code of Civil and Family Procedure, art. 348).

This certificate meets those conditions with open standards that can be verified without trusting us: SHA-256 fingerprint, third-party RFC 3161 timestamp, OpenTimestamps on Bitcoin and independent copies at Internet Archive.

It does not replace a notarial certification of facts or a NOM-151 preservation certificate. If you need it for a lawsuit or a formal procedure, the same fingerprint can be backed by them: write to us with the folio.

V How to verify it yourself

  1. Descarga el sello (sello.tsr).
  2. Download from freetsa.org its certificates cacert.pem y tsa.crt, and check the timestamp: openssl ts -verify -digest 77ae98e851f6adcbd63922953f77af4d65b22ded26c757fd272c2607aa23bc74 -in ccrbtkvmha-sello.tsr -CAfile cacert.pem -untrusted tsa.crt. It should say “Verification: OK”.
  3. The .ots file can be checked at opentimestamps.org. The Internet Archive copies open directly on web.archive.org.
QR code for this certificateScan to verify it online

Issued automatically by Turing, the analysis system of Memoria y Resistencia, with no human intervention.

Reference number CC-RBTK-VMHA · https://memoriayresistencia.org/medios/certificado/CCRBTKVMHA

This certificate shows the status of the copy at the moment it is opened; the fingerprint and the timestamp never change.

memoriayresistencia.org · contacto@memoriayresistencia.org

Before you download · Step by step

How to use the timestamp (sello.tsr)

It is the stamp signed by FreeTSA, an independent third party, under the RFC 3161 standard. It proves the copy's fingerprint already existed at that date and time, and that nobody changed it afterwards.

  1. Download the stamp and save it in a folder.
  2. Download from freetsa.org its certificates cacert.pem y tsa.crt, y ponlos en la misma carpeta.
  3. Abre la Terminal en esa carpeta (necesitas OpenSSL; ya viene en Mac y Linux) y escribe:openssl ts -verify -digest 77ae98e851f6adcbd63922953f77af4d65b22ded26c757fd272c2607aa23bc74 -in ccrbtkvmha-sello.tsr -CAfile cacert.pem -untrusted tsa.crt
  4. Si responde «Verification: OK», el sello es auténtico. Para ver la fecha y hora selladas:openssl ts -reply -in ccrbtkvmha-sello.tsr -text
Continue download

Before you download · Step by step

How to use the OpenTimestamps proof (sello.ots)

It is the proof that the copy's fingerprint was recorded on the Bitcoin blockchain, a public record nobody can alter or delete.

  1. Download the .ots file.
  2. Entra a opentimestamps.org y arrastra el archivo .ots al recuadro de la página.
  3. La página te muestra la huella registrada. Debe ser:77ae98e851f6adcbd63922953f77af4d65b22ded26c757fd272c2607aa23bc74
  4. It will tell you in which Bitcoin block and on what date it was recorded. If it says it is still pending, try again in a few hours.
Continue download