Sign any document with a post-quantum ML-DSA signature. The server adds a cryptographic timestamp. Anyone can verify the receipt — forever. Your document never leaves your browser.
Your document is hashed locally — the server only receives the fingerprint.
Your browser computes SHA-256 and SHA-512 fingerprints of the document. The file itself stays on your device — zero bytes uploaded.
You sign the hash with your ML-DSA private key (NIST FIPS-204). The signature mathematically proves you authorized this exact document.
PQCServer adds a certified timestamp and countersignature. This anchors the document to a precise moment in time.
You receive a JSON receipt with a permanent verify URL. Anyone can check it anytime — no account needed to verify.
A self-contained cryptographic proof. Download it as JSON or share the verify URL.
Prove a contract existed in its current form before signing with a traditional notary. Establish precedence in case of disputes about document contents or dates.
Timestamp creative works, inventions, research papers, or source code. Establish prior art without expensive patent filings during early development.
Prove a medical report was issued on a specific date. Verify a clinical protocol has not been modified retroactively. Critical for compliance and liability.
Journalists can timestamp sensitive documents and evidence. Prove source documents were unaltered before publication. Protect whistleblower materials.
Timestamp project drawings, permits, inspections, and site reports. Essential when disputes arise years after a project about the state of documentation at a given date.
Sign software releases, configuration files, and security policies. Verify that code deployed in production matches the signed version. Detect tampering.
ML-DSA is a NIST federal standard (FIPS-204, Aug 2024). Legal recognition of PQC signatures is actively evolving — the EU, US, and other jurisdictions are integrating it into their frameworks.
eIDAS 2.0 framework (2026) will incorporate PQC algorithms. ETSI is standardizing PQC signature profiles. ML-DSA receipts establish strong technical proof now, with formal legal recognition following the standards roadmap.
ESIGN Act recognizes electronic signatures broadly. NIST FIPS-204 is already a federal standard. ML-DSA receipts can be used as evidence in many commercial contexts. Federal agencies must adopt PQC by 2030.
Many jurisdictions accept cryptographic evidence under electronic commerce laws. The UN Model Law on Electronic Commerce provides a broad framework. PQCServer receipts provide strong cryptographic proof admissible as evidence in most legal systems.
Free. No size limit. Document never leaves your browser. Permanent receipt. Publicly verifiable forever.