TL;DR: A blockchain certificate, also called a blockchain credential, is a digital certificate, diploma or licence whose cryptographic fingerprint is recorded on a public blockchain at the moment it is issued. Anyone can verify it by recomputing that fingerprint and comparing it with the record, without contacting the issuer. A match proves which issuer recorded the document and that nothing in it has changed since, and that no one else can issue it in the issuer's name. TRUE Original has issued over 900,000 blockchain-secured documents for more than 200 organisations in more than 15 countries.
A blockchain certificate is a digital certificate, diploma, licence or other credential whose cryptographic fingerprint is written to a public blockchain when the issuer issues it. Blockchain certificate, blockchain credential and blockchain digital credential are three names for the same thing. The record on the blockchain lets anyone confirm which organisation issued the document and that its content is unchanged. A blockchain certificate is a digital credential (a diploma, certification, award, license, or other document) that has been recorded on a blockchain, making it permanently verifiable and cannot be forged undetected.
A paper certificate or a PDF is a claim. It says that an organisation awarded something to someone, and the only way to test the claim is to ask that organisation. Anyone with a design program can produce a document that looks the same.
A blockchain certificate carries its own test. When it's created, a unique mathematical fingerprint of the certificate is recorded on a blockchain: a distributed database that exists across thousands of computers worldwide. Change one letter in the certificate and its fingerprint no longer matches the one on record.
The certificate itself stays off the chain. MIT, one of the first universities to issue blockchain diplomas, put it plainly in 2017: “The diploma information itself doesn’t go onto the blockchain.” Only a timestamped transaction showing that MIT created the record does. Modern implementations also support selective disclosure: revealing only necessary information.
Platforms that anchor documents on a public blockchain include TRUE Original, BCdiploma, Accredible, Credly and Sertifier, each according to its own website on 1 October 2026, and Blockcerts is an open standard for organisations that would rather build their own. They differ in how much gets anchored. TRUE Original anchors every document it issues, from course certificates and diplomas to licences, on public blockchains such as Ethereum and Polygon, while Credly and Sertifier make blockchain an option the issuer switches on. Anyone can check a TRUE document in TRUE Verify, free and without an account.
A blockchain certificate proves two things: which issuer recorded it, and that its content has not changed since the moment of issue. That the course was attended and the exam passed is vouched for by the issuer, exactly as with a paper diploma. The blockchain makes sure nobody else can vouch for it in the issuer's name.
Forgers rarely invent an issuer. They borrow a real one, because the real name is what an employer trusts. A blockchain record takes the borrowed name away: a document the issuer never recorded fails the check, however good the design.
The reader still decides what the issuer's name is worth. The certificate settles who the issuer is, beyond argument, and leaves the reputation to the issuer.
A blockchain credential works in four steps: the issuer creates the certificate, software computes its fingerprint, the fingerprint is written to a blockchain, and the recipient receives the certificate with a link and a QR code for verification. The recipient never handles the blockchain. With TRUE Original the whole sequence runs when the issuer issues from the dashboard, sends a structured email or calls the API.
The certificate holds what any certificate holds: the recipient's name, the title of the course or qualification, the date of issue and, where it applies, an expiry date. The design carries the issuer's brand, and with TRUE Original it can be animated.
The certificate's content runs through a cryptographic hash function such as SHA-256, which turns it into a fixed-length string of characters. The US National Institute of Standards and Technology specifies SHA-256 in its Secure Hash Standard, FIPS 180-4 (August 2015), and states the property that makes it useful here: “Any change to a message will, with a very high probability, result in a different message digest.” One added space is enough. The function runs one way only: the fingerprint cannot be turned back into the certificate's text.
The same fingerprinting works for any file. TRUE Vault uses it to prove that a document, image or other file existed, unchanged, at a given moment.
The fingerprint goes into a transaction on a public blockchain, and the network records it with the time it was added. Nobody can edit or delete that transaction afterwards, the issuer included. TRUE Original writes to several public blockchains, among them Polygon and Ethereum, which according to ethereum.org has run since its Frontier launch on 30 July 2015. They're designed for permanence: that's the point of the technology. Platforms supporting multiple blockchains provide redundancy. If one network experiences issues, others remain operational.
The recipient gets a link, and the certificate carries a QR code. With TRUE Original the certificate can live on the issuer's own domain, so the address a reader checks belongs to the organisation named on the document. The recipient can share it on LinkedIn or attach it to an application without ever learning what a hash is.
Blockchain credential verification recomputes the fingerprint of the certificate being checked and compares it with the fingerprint the issuer recorded on the blockchain. If the two match, the certificate is the one the issuer issued and nothing in it has changed. If they differ, or no record exists, the document has been altered or was never issued by that organisation.
For a certificate issued with TRUE Original, the check runs through TRUE Verify. The reader scans the QR code or opens the certificate's link. Nobody calls the issuer.
Behind the answer, a certificate verification system using blockchain does four things:
MIT News described the same mechanism on 17 October 2017, when MIT gave its first blockchain diplomas to graduates. The verification portal, it wrote, “essentially uses the blockchain as a notary, locating the transaction ID (which identifies when the digital record was added to the blockchain), verifying the keys, and confirming that nothing has been altered since the record was added.”
A lookup in the issuer's own database works differently. The issuer controls that database, so anyone with access to it can change what it says, and the answer depends on the issuer's server being up. A blockchain record sits outside the issuer's control. An employer in another time zone gets the same answer at eleven at night as at ten in the morning.
A failed check is information too. A mismatch means the document on the screen is not the document that was issued, and a missing record means the issuer never issued it. TRUE explains the difference between the methods in blockchain versus traditional certificate verification and walks through the checks a reader can make in how to check if a certificate is real.
No, not with TRUE Original: no personal data is stored on the blockchain itself, only a cryptographic hash that proves the certificate's integrity. The hash cannot be turned back into the recipient's name or the course. TRUE Original is a Swedish company, and the names and training details in its certificates are handled according to EU data protection requirements.
The certificate with the name on it sits on a web page that the recipient decides to share. Recipients can hide a TRUE document behind a password or keep it out of search engines, as the TRUE GDPR page explains. The public record on the blockchain holds a string of characters and nothing a stranger could read a person from.
Yes. The issuer can revoke a blockchain certificate: the original record stays on the blockchain, and the verification result changes to revoked. With TRUE Original, revocation is instant, and QR code scans, the verification portal and the blockchain record all reflect it from that moment.
A revoked TRUE Original certificate is never deleted. It still resolves and shows its true status, so an employer who opens an old link sees a withdrawn certificate, not a dead page. Expiry works the same way. Renewal, expiry and revocation are covered in TRUE's guide to digital credential lifecycle management.
An organisation needs blockchain certification when people outside it rely on its certificates: employers, clients, insurers, hotel guests or regulators. Blockchain certification lets those people confirm a certificate in seconds, without contacting the issuer. A forged document carrying the issuer's name fails the check. The issuer stops answering verification requests and stops lending its name to documents it never issued.
In a YouGov survey of 526 UK HR decision makers, commissioned by the degree verification service Hedd and published by Prospects in July 2025, 45% of large companies said they had discovered an applicant giving false information about qualifications. In the same 2025 survey, 67% of large companies reported a rise in job application fraud and attributed it to AI tools. Chris Rea, who leads Hedd's qualification fraud service, said: “The rise of AI-generated CVs makes it easier than ever for candidates to misrepresent their qualifications and it can be harder for employers to spot.”
A blockchain certificate changes what a forger has to beat. A convincing design no longer helps, because the check compares fingerprints, not appearances.
The same Hedd survey from 2025 found that 52% of large businesses check all academic credentials, and that 26% of small companies do not check qualifications at all. Checking a paper certificate or a PDF means writing to the issuer and waiting for a reply. A blockchain certificate removes the wait.
Every certificate sent out as a PDF is a possible phone call or email, months or years later, to whoever ran the course. Answering means looking up records and writing confirmations. The work grows with every certificate issued. With a blockchain certificate the reader checks the document directly, and the issuer's staff handle only the exceptions. Across its customers, TRUE Original has saved more than 100,000 hours of issuing, handling and verification.
For most organisations, blockchain certificate platforms cost comparable to (or less than) traditional credential management when you factor in:
Organisations merge. They replace their systems, and some close. A record on a public blockchain does not depend on any one of them, because no single organisation owns the network that keeps it. Even if the platform you use to issue certificates stopped operating, the blockchain records would remain. Verification would still work through the blockchain itself. TRUE Original documents are verifiable by anyone, anytime, forever.
The recipient keeps the link and decides who sees it. Nobody has to ask the issuer for a copy ten years later, which also ends the duplicate requests.
People share a certificate they are proud of, on LinkedIn, on their own websites and in applications. Each share puts the issuer's brand in front of people who trust the person sharing it. Documents issued with TRUE Original have generated over 100 million marketing impressions worldwide.
Universities, certification bodies, associations, government agencies and training providers issue blockchain certificates. MIT ran one of the first pilots: in 2017, 111 graduates could receive their diplomas through an app built on Blockcerts, an open-source toolkit from MIT Media Lab and Learning Machine, alongside the paper version. More than 200 organisations in more than 15 countries issue their documents with TRUE Original.
Karolinska Institutet, the university whose Nobel Assembly awards the Nobel Prize in Physiology or Medicine, issues its course certificates with TRUE Original straight from Canvas. Karolinska Institutet, one of Europe's leading medical universities, uses blockchain certificates for training credentials.
SSF Stöldskyddsföreningen, founded in 1934, writes the security standards Swedish installers and insurers work to, and issues blockchain-secured certificates that anyone can verify without contacting SSF. SSF Stöldskyddsföreningen, Sweden's leading security authority, operating for over 80 years, uses blockchain certificates for security professional credentials. Maria Dahlstedt, Program Manager at SSF: “It has been particularly important for us to be able to ensure that our Proofs of Education, in the form of Certificates and Diplomas are correct and secure.”
Bolagsverket, the Swedish Companies Registration Office, built its Proof of Business concept with TRUE in eight weeks. It then received a government mandate to investigate a second phase covering licences, trademark certificates and company registrations.
Great Place To Work has issued close to a thousand certifications through TRUE, and Safe Cert Group, which certifies hotels on fire safety, hygiene and daily operations, more than a thousand. Each set has been viewed well over a hundred thousand times. Great Place To Work, the global workplace culture certification organisation, uses blockchain to ensure their certifications are genuine. Safe Cert Group: Hospitality safety certifications for hotels and restaurants.
OneMore Secure has issued every customer's cyber hygiene certificate through TRUE since it launched its service in early 2023. OneMore Secure: Cybersecurity professionals certifying other cybersecurity professionals. They understand document security at a technical level and chose blockchain for its cryptographic guarantees. "For us, it's only natural to collaborate with the player in secure document management that has the highest quality, and stands for world-class security." (Matti Olofsson, CEO, OneMore Secure) Yrkeshögskoleförbundet, the Swedish vocational college association, issues its certificates digitally with TRUE. Yrkeshögskoleförbundet, Sweden's vocational higher education association, has adopted blockchain certificates, setting the standard for 21+ vocational schools in their network.
Blockchain certificates differ from paper and PDF certificates in one main way: the reader can verify them without the issuer. Digital badges sit in between, and how well a badge resists forgery depends on how the badge platform secures it.
| Aspect | Paper | Digital badges | Blockchain certificates | |
|---|---|---|---|---|
| Forgery resistance | Low: copied and altered | Low: edited with standard software | Depends on the platform and badge version | High: any change breaks the fingerprint match |
| How a reader verifies | Contacts the issuer | Contacts the issuer | Platform lookup, or a signature check (Open Badges 3.0) | Fingerprint check against the blockchain |
| Verification speed | Days/weeks | Days/weeks | Minutes (if platform works) | Seconds |
| Where the proof lives | With the issuer | With the issuer | On the platform | On a public blockchain |
| Permanence | Degrades, lost | Files lost, links break | Vendor-dependent | Permanent (distributed) |
| Sharing | Physical only | Email attachment | Link | Link |
| Marketing value | None | None | Shares on social networks | Shares, with view and share analytics in TRUE Original |
Paper can be photocopied, scanned and altered, and it gets lost. Verifying a paper certificate means contacting the issuer, assuming the contact details still work.
A PDF travels faster than paper and edits as easily as any document. Without a signature or a record outside the file, the only test is again to ask the issuer.
Badge platforms made credentials shareable as links. Digital badge platforms like Credly and Accredible provide better sharing and some verification features. However, most don't in fact use blockchain: they use proprietary databases. Some platforms verify a badge against their own database. If the vendor goes out of business, verification breaks. The vendor controls the data, not the issuer. Badges built on Open Badges 3.0, which 1EdTech aligned with the W3C Verifiable Credentials Data Model v2.0, can carry a cryptographic signature, and some platforms offer blockchain anchoring as an option. TRUE explains the signature approach in its guide to W3C Verifiable Credentials.
A blockchain certificate is shared as a link, like a badge, and its proof lives on a public network rather than on one company's servers. The reader can check the record whether or not anyone at the issuer answers the phone.
Choose a blockchain credential provider by asking which public blockchain it writes to, whether anyone can verify a certificate without an account, and whether the certificates can live on your own domain. A provider that names its public chain lets you check the claim yourself. Important: Some platforms market themselves as "blockchain" or "blockchain-powered" without in fact recording credentials on a blockchain. TRUE Original records on public blockchains including Ethereum and Polygon, hosts certificates on the issuer's domain and lets anyone verify them through TRUE Verify.
Six questions separate the providers:
TRUE Original issues certificates, diplomas, awards, badges, licences, memberships, transcripts and vouchers. It connects to Canvas LMS, Moodle, Learnster and Salesforce, offers a REST API with five endpoints and email-based issuing, and shows when, where and by whom a document is opened and shared. For a side-by-side view of providers, with published prices, see TRUE's comparison of five digital credential platforms.
Start with the certificate that is checked most often, or the one that would do most damage if forged. Design it once, then pick the issuing route that fits the volume. With TRUE Original that route is the dashboard for single documents and batches, a structured email, or the API for automatic issuing from an LMS or CRM.
To see your own certificate as a blockchain-secured document, book a demo.
At Karolinska Institutet, a course certificate now goes out automatically the moment a participant completes a course in Canvas. Over a thousand have been issued that way since the switch, and nobody types a name by hand.
A blockchain digital credential is a digital certificate, diploma or licence whose cryptographic fingerprint is recorded on a public blockchain when it is issued. To verify it, software recomputes the fingerprint of the credential and compares it with the record on the blockchain. A match shows which issuer recorded it and that nothing in it has changed since.
Yes. Blockchain certificate, blockchain credential and blockchain digital credential describe the same thing: a credential whose fingerprint is recorded on a blockchain so that anyone can verify it without contacting the issuer.
The issuing organisation vouches for the course, as with any certificate, and the blockchain certificate proves that the organisation issued it and that its content has not changed since. A document the issuer never recorded fails the check, however convincing it looks.
No. Only the certificate's cryptographic fingerprint, a hash, is written to the blockchain, and the hash cannot be turned back into the content. The certificate itself reaches the recipient as a link, which TRUE Original can host on the issuer's own domain.
Seconds. The reader scans the QR code or opens the link, the system compares the certificate's fingerprint with the blockchain record, and nobody at the issuer has to answer. Anyone can verify a TRUE Original document through TRUE Verify.
No. Recipients receive a link and a QR code, and they can view the certificate, share it on LinkedIn or add it to an application without knowing what a hash is.
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