Cryptographic timestamp proofs (OpenTimestamps protocol) for Sprinkling Act published reports.
Each .ots file is a portable proof that the corresponding PDF existed at the timestamp date, anchored on the Bitcoin blockchain via decentralised calendar servers. The proof can be verified by anyone, independently of Sprinkling Act, using the open-source OpenTimestamps client.
| Report | Public URL / DOI | MD5 | Stamped on | .ots file |
|---|---|---|---|---|
| EU AI Act Readiness — A Structured Screening of 50 European AI Companies (April 2026) | Concept DOI 10.5281/zenodo.19671328 (resolves to latest version) · v1 10.5281/zenodo.19671329 · SSRN Abstract ID 6652418 · HAL hal-05631107 | a134924887bcf2450ebc30eb81850ad1 |
2026-04-27 | eu-ai-act-readiness-report-april-2026.pdf.ots |
| EU AI Act Readiness — Annex A — The Deployer Multiplier (May 2026) | Concept DOI 10.5281/zenodo.20042174 (resolves to latest version) · v1 10.5281/zenodo.20042175 · SSRN Abstract ID 6816018 · HAL hal-05631110 | 267d890a29eda0d1c118f06fd75d5fa5 |
2026-05-06 | eu-ai-act-readiness-report-annex-a-may-2026.pdf.ots |
| The AI Act as a Third Structural Pole — A Constrained Retrospective on the Predictive Frame, 2015 to 2026 (Discussion Paper DP-2026-001, May 2026) | Concept DOI 10.5281/zenodo.20343243 (resolves to latest version) · v1 10.5281/zenodo.20343244 · SSRN Abstract ID 6815659 | e15914828254f94e50dfe061439d40bd |
2026-05-22 | eu-ai-act-third-attractor-may-2026.pdf.ots |
| Sprinkling Act Methodology Card — April 2026 edition (v1.1, expanded) | https://sprinklingact.com/methodology | 72f75b1a5238001cbe48e457b5761622 |
2026-05-06 | sprinkling-act-methodology-april-2026.pdf.ots |
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Install the OpenTimestamps client (Python):
pip3 install opentimestamps-client
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Download the original PDF from Zenodo using the DOI link above, and download the matching
.otsfrom this repository. Place both files side by side. -
Run the verification:
ots verify eu-ai-act-readiness-report-april-2026.pdf.ots
The client will check the proof against the Bitcoin blockchain and report the date at which the file existed.
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Optional — upgrade the proof first (if it was just freshly created and the Bitcoin attestation is not yet bundled):
ots upgrade eu-ai-act-readiness-report-april-2026.pdf.ots
This pulls the latest Bitcoin attestation from the calendars and bakes it into the
.otsfile. After upgrade, no internet connection is needed for verification.
Proves: the PDF existed in this exact byte-for-byte form at the timestamp date. Independent of Sprinkling Act, of any third-party authority, and of any commercial relationship.
Does not prove: the truthfulness of the report's content, its compliance with any specific regulation, or any endorsement by a public body. OpenTimestamps is a cryptographic existence-proof, not a content-validation mechanism. The report itself is published under CC BY 4.0 and remains an independent assessment that does not constitute legal advice — see the report's own disclaimer.
- Free, open standard (RFC-compatible)
- Anchored on the Bitcoin blockchain (immutable, globally verifiable)
- No commercial dependency — verifiable even if Sprinkling Act ceases to operate
- Compatible with eIDAS-style independent verification needs (without claiming qualified-trust-service status)
The .ots proof files in this repository are released under CC0 1.0 (public domain) — they are pure cryptographic artefacts and contain no creative content.
The reports themselves are published on Zenodo under their respective licenses (CC BY 4.0 for the April 2026 report).