Block.co, a pioneer in Blockchain Credentialing applications, offers a platform to issue and verify digital certificates anchored to Bitcoin's blockchain. Because the proof of integrity lives on the blockchain, a certificate's contents can be verified at any time — even if the issuing institution is no longer reachable. This site enables anyone to validate digital certificates. Certificates are issued as PDF files with special metadata that anchor them into the blockchain.
Please note: The actual PDF of the certificate itself is not published to the blockchain, but rather a fingerprint of the PDF. This fingerprint is enough to confirm that the exact document was anchored on Bitcoin's blockchain at a specific time and has not been altered since.
Verify Your Certificate
Upload your blockchain-anchored certificate PDF to verify its authenticity
Upload Certificate
Drag and drop your PDF certificate here, or click to browse
Supported format: PDF • Max size: 50MB
Your certificate will be verified locally. No data is uploaded to any server.
Frequently Asked Questions
Blockchain-based certificate verification uses the blockchain to create an immutable, timestamped record of certificate issuance. The certificate's digital fingerprint (hash) is anchored to the blockchain, creating a tamper-evident, independently verifiable record — the document cannot be altered or backdated without detection.
When a certificate is issued, its fingerprint (hash) is anchored on the blockchain through the issuer's transaction. During verification, we recalculate the certificate's hash and confirm it matches the anchored blockchain record. This confirms the document's integrity — that it has not been altered since it was issued.
No. Only a cryptographic fingerprint (hash) of the certificate is stored on the blockchain. This ensures privacy while still allowing anyone to verify authenticity. The actual certificate content remains private unless you choose to share it.
Verification shows: the issuing organization (and whether its identity has been verified by Block.co), the issuance date and time (timestamped by the blockchain), certificate metadata, the blockchain transaction ID, and the verification status. You'll also see if the certificate has been revoked or has expired.
Yes. Issuers can revoke certificates by publishing a revocation transaction on the blockchain. This ensures that even if someone has the certificate file, its revocation status can be independently verified.
No account needed! Simply upload your certificate PDF and the verification happens automatically — it's an open, public verification service.
Yes, this verification service is completely free. Anyone can use it to verify certificates issued through Block.co's platform.
Currently, only PDF files with embedded blockchain anchoring metadata are supported. These PDFs are specially created by Block.co's issuance platform.