Legal Validity of Hash Blockchain in Pericial Reports in Spain (Legal Guide 2026)
May 2026 | 14️ 14 min read | Por By PropTrust VerifiedTM
The expert reports with hash blockchain are already valid in Spain. Following the adaptation of the EIDAS Regulation (EU 910/2014) and the recent jurisprudence of Provincial Hearings, blockchain technology has been consolidated as a documentary evidence medium with the same evidentiary force as a notary writing.
This technical-legal guide explains how hash SHA-256 works in expert reportswhich rules back it and why courts, notaries and insurers admit it as proof of documentary integrity.
▷✅ EIDA compliance | LEC Art. 326 | GDP Compatible
️ Policy framework: Why is it legally valid?
) Regulations applicable in Spain (2026)
- EIDAS (EU 910/2014): Recognizes electronic trust services, including time seal and qualified electronic conservation.
- Civil Procedure Act (Art. 326): Admits as evidence the “electronic documents that guarantee their authenticity and integrity”.
- Law 34/2002 (LSSI): Equip electronic documents with cryptographic hash to private public documents.
- GDPR and LOPDGDD: The hash does not contain personal data, only cryptographic print of the document.
How does the hash SHA-256 work in an expert report?
The technical-legal process is as follows:
- Submission of the report: The collegiate expert writes and digitally signs the technical opinion.
- Hash calculation: The SHA-256 algorithm is applied to the full PDF file, generating a single string of 64 hexadecimales characters (e.g.:
a3f5d8c2e1b4...). - Registration in blockchain: The hash is recorded in a public blockchain (Ethereum/Bitcoin) with timestamp, creating an immutable temporary seal.
- Public verification: Any third party can calculate the PDF hash and compare it to the blockchain register to confirm that it has not been altered.
◾ Important: What is NOT a blockchain hash
- ❌ It is NOT a digital signature (although it complements it)
- ❌ DO NOT contain the content of the report (only its cryptographic footprint)
- ❌ DO NOT store personal data on blockchain (GDP)
- ▷ Yes guarantees that the document has not been altered or a coma
- ▷ YES test the existence of the document at an exact date/time
s️ Jurisprudence: Real cases admitted to Spanish courts
| Judgment/Audience | Year | Type of case | Resolution |
|---|---|---|---|
| AP Valencia, Sec. 12a | 2025 | Hidden vics sale | ▷ Admitted as valid expert test |
| Commercial Court No. 3 Madrid | 2025 | Pathologies construction | ▷ Recognized integrity of the blockchain report |
| AP Barcelona, Sec. 15a | 2024 | Maritime sinister | ▷ Valid hash as a test medium |
How to verify an PropTrust VerifiedTM report
Anyone can verify the authenticity of a report in 3 steps:
- Get the hash: The report includes a QR code and the hash SHA-256 printed on the footer.
- Calculate PDF hash: Use online tool (e.g. sha256online.org) or visit proptrustverified.com/verify and upload the PDF.
- Compare: If the calculated hash matches the one recorded in blockchain → ▷✅ Real document. If not agreed → ❌ altered document.
Cases of use: when is it especially useful?
- ✅ Judicial expert reports: It avoids challenges for “alteration of opinion” between the issue and the submission in trial.
- ✅ Purchase of assets: The buyer can verify that the due diligence report is the original issued by the expert.
- ✅ Claims to insurers: It shows that the damage report was not modified after the inspection.
- ✅ Subsidies and tenders: Administrations can verify the authenticity of technical reports submitted.
- ✅ Notes and records: It complements the public notarial faith with blockchain traceability.
Do you need to verify a report or integrate blockchain into your professional flow?
PropTrust VerifiedTM offers free public verification and integration APIs for professionals.
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