Frequently asked questions

POK (Proof of Knowledge) is a global platform designed to issue, manage, and verify digital credentials securely, interoperably, and scalably. It is intended for universities, training centers, companies, governments, and organizations seeking to certify academic or professional achievements with maximum reliability.

Unlike other providers, POK combines ease of use with compliance to the highest international standards: OpenBadge 3.0, W3C Verifiable Credentials, and European Learning Model. This ensures that issued credentials can be shared and verified anywhere in the world.

POK offers two modalities:
  • Free (Web2): unlimited digital credentials, without expiration, verifiable by link or QR code, without lock-in or hidden costs.
  • NFT (Public Blockchain): credentials registered as unique tokens, with permanent traceability and decentralized verification.

With over 1,000 institutions in America, Europe, and Asia, POK is the solution for those seeking to combine innovation, security, and flexibility in credential issuance.

The free (Web2) version of POK is perfect for those who want to start without costs or restrictions. It allows issuing and verifying unlimited digital credentials with custom design and compatibility with open standards. Verification is done via a unique link or QR code, and the credential remains active indefinitely.

The NFT (Public Blockchain) version goes further: each credential becomes a unique and unalterable Non-Fungible Token, registered on a public blockchain. This enables:

  • Decentralized verification without relying on the platform.
  • Historical traceability showing when and by whom it was issued.
  • Digital ownership for the recipient, who can store it in their wallet and display it on professional networks.


Both versions are compatible, and you can migrate credentials from Web2 to NFT at any time without reissuing or losing history.

POK is a 100% cloud-based digital credential platform, accessible from anywhere in the world with an internet connection.

It is optimized to work with institutions and companies in America, Europe, Asia, and Africa, with active implementations in over 30 countries.

It complies with international data protection regulations, including GDPR in Europe and equivalent legislation in Latin America, Asia, and other regions, ensuring security, privacy, and legal compliance.

POK uses global standards such as OpenBadge 3.0, ELM, and W3C Verifiable Credentials, ensuring that issued credentials are interoperable, verifiable, and valid in various contexts, regardless of the country or destination platform.

Educational institutions, training centers, startups, and training companies can implement POK without geographical barriers.

Additionally, it offers specialized technical support and multilingual documentation, facilitating adoption in any region.

POK allows issuing diplomas, certificates, badges, and micro-credentials fully customized and compatible with major international standards.

This includes academic credentials, professional certifications, corporate recognitions, and specific course or program achievements.

Each issued credential can include metadata such as the recipient's name, issuance date, achievement description, criteria for obtaining it, and, if desired, additional evidence such as documents, photos, or videos.

The platform supports customizable visual formats with the institution’s logo, digital signature, and design tailored to brand identity.

Additionally, all issued credentials are verifiable online and, in the case of the NFT version, also on a public blockchain, ensuring their authenticity and permanence.

Yes. POK includes a visual editor that allows tailoring each credential to the institutional or corporate image.

You can customize colors, fonts, backgrounds, logos, signatures, and information layout.

Additionally, you can define reusable templates to streamline mass issuance and maintain design consistency.

Customization is not only aesthetic: you can also include dynamic fields that are automatically filled with recipient, course, or certification data.

For NFT credentials, the visual design is combined with technical metadata on the blockchain, ensuring that the information displayed matches what is recorded on the network.

This means it not only looks good but is also backed by cryptographic security.

One of the most valued features by institutions is the ability to attach evidence to each issued credential.

This can include: PDF documents (assignments, reports, previous certificates), photos or screenshots, videos or presentation recordings, links to projects or online repositories.

This evidence objectively demonstrates compliance with the requirements for obtaining the credential.

In the NFT version, evidence can be linked to blockchain metadata, ensuring that verification includes both the credential and its supporting documents.

This is especially useful for technical certifications, professional licenses, or continuing education programs where documentary validation is key.

POK offers bulk import tools that allow bringing credentials issued on other systems, as long as they comply with standards like OpenBadge or interoperable formats.

The process is quick: files or records are uploaded in a compatible format and integrated into your POK account, maintaining traceability and verification.

This allows institutions to unify their credential history on a single platform, facilitating management and access for issuers and recipients.

It’s even possible to migrate credentials from closed or proprietary systems, converting them to an open format and avoiding vendor lock-in that limits portability.

POK allows exporting credentials in formats compatible with Europass, the European initiative that facilitates the presentation and verification of skills and qualifications internationally.

This means that a diploma or certificate issued with POK can be directly integrated into the Europass profile of the holder, alongside other academic or professional documents.

Compatibility with Europass is key for students and professionals seeking opportunities in Europe, as it allows them to present their achievements in a recognized format by employers, universities, and authorities in various countries.

Additionally, thanks to interoperability with standards like OpenBadge 3.0 and W3C Verifiable Credentials, POK credentials can coexist and complement other digital documents within the Europass ecosystem, facilitating academic and professional mobility.

POK is aligned with the most relevant industry standards, including:

  • OpenBadge 3.0: the most widely used open standard for digital badges
  • W3C Verifiable Credentials: an internationally recognized data model for verifiable credentials
  • European Learning Model (ELM): a European framework to ensure interoperability in education and employment


Complying with these standards means that credentials issued with POK can be integrated and verified on other platforms, learning management systems (LMS), and job boards that support these formats.

This gives issuers and recipients peace of mind that their credentials won’t become obsolete or tied to a single provider.

POK has a built-in feature that allows credential recipients to add them to their LinkedIn profile in just a few clicks.

Once added, the credential appears in the “Licenses and Certifications” section of the profile, displaying details such as the issuing institution’s name, issuance date, and a verification link.

This increases the visibility of the achievement and strengthens the issuer’s brand, as anyone visiting the profile can verify the credential’s authenticity directly from LinkedIn.

For NFT credentials, the verification link can point to both the POK portal and the public blockchain record, offering dual assurance of validity.

There are no hidden costs or variable fees for using the blockchain that could surprise the customer.

In the POK model, the price of each NFT credential already includes the cost of registering the transaction on the blockchain.

This gives you budget predictability: you know exactly how much you’ll pay for each issuance, without depending on the volatility of “gas fees” on the network.

The free (Web2) version has no cost per credential and allows issuing as many as you want without limits.

An NFT (Non-Fungible Token) is a unique and non-reproducible record on a blockchain that certifies the existence, authenticity, and ownership of a digital asset.

In the context of credentials, an NFT acts as a “fortified version” of your diploma or certificate:

  • It cannot be altered or duplicated
  • It contains metadata with all relevant information (name, date, issuer, criteria, evidence)
  • It can be verified independently, without relying on the issuing system


The great advantage of an NFT is that its validity does not depend on POK existing in the future: as long as the blockchain is active, the credential can still be verified.

Additionally, it can be stored in a personal wallet, shared on networks, or presented in selection and accreditation processes without needing confirmation from the issuer.

In the world of digital credentials, some providers claim to use “blockchain” but actually only generate a hash (a cryptographic fingerprint) and store it on a server or a private network.

This is not the same as registering the complete credential on a public blockchain:

  • A hash alone does not contain the document or its metadata, only an alphanumeric string that “represents” the credential
  • If the server hosting the information disappears or is manipulated, the verification breaks
  • In contrast, on a public blockchain, the credential and its verification data are distributed across multiple nodes, without dependence on a central server


POK NFT uses real public blockchain, ensuring that verification is transparent, decentralized, and accessible to anyone at any time.

A public blockchain is an open network where anyone can read, verify, and even participate in transaction validation (depending on the protocol).

This means maximum transparency and resistance to manipulation, as the data is distributed across thousands of nodes. Examples: Ethereum, Polygon, Bitcoin.

A private blockchain is managed by an organization or consortium that controls who can access and record information. While it may be faster and cheaper, it depends on a central administrator, reducing its decentralization and resistance to censorship.

POK uses public blockchain for its NFT credentials, ensuring that verification does not depend on a single actor and that any third party can validate the credential’s authenticity without needing permission.

In the unlikely event that the public blockchain used stops operating or loses support, NFT credentials issued with POK can be migrated or backed up to another network while maintaining their traceability.

This is possible because POK stores the original credential information and can re-register it on a new blockchain without altering its content or metadata.

Additionally, being based on open standards (W3C VC, OpenBadge 3.0), the credentials are portable by design, ensuring their durability even with future technological changes.

In summary, you don’t depend on a single network or specific provider to maintain the validity of your credentials.

OpenBadge 2.0 was the reference standard for digital credentials for years, allowing the inclusion of basic metadata about the issuer, recipient, and achievement.

OpenBadge 3.0, supported by POK, takes this capability much further:

  • It integrates the format with the W3C Verifiable Credentials (VC) model
  • It improves interoperability with other systems and professional networks
  • It allows adding enriched metadata, such as alignments with competency frameworks, detailed criteria, and evidence


This means that a credential issued under OpenBadge 3.0 is not only richer in information but also has greater integration capacity with future platforms, ensuring its long-term validity.

With POK, verification is immediate and accessible to any third party.

In the Web2 version: each credential includes a unique link and/or QR code that, when scanned or opened, displays the complete credential details on the POK verification portal.

In the NFT version: the credential is registered on a public blockchain, so it can also be verified through a block explorer (e.g., PolygonScan). This allows confirming authenticity even if POK ceases to operate.

In both cases, verification displays information such as:

  • issuer
  • holder
  • issuance date
  • criteria for obtaining
  • status (valid, expired, or revoked)

POK allows revoking or setting an expiration date for any credential issued, in both the Web2 and NFT versions.

When a credential is revoked or expires, its status immediately changes in the verification system, and in the case of NFTs, the blockchain reflects this change through metadata or update events.

This is especially useful for licenses, professional qualifications, or certifications that require periodic renewal. Revocation ensures that no one can present an invalid credential as valid.

Web2: The data and files of the credentials are stored on secure servers with encryption and redundancy measures, complying with international security and privacy standards.

NFT: The essential information (hash, metadata, identifiers) is stored on a public blockchain, while heavier elements like images or associated documents may be hosted on decentralized solutions like IPFS.

This hybrid approach ensures availability, integrity, and low storage costs.

POK complies with the General Data Protection Regulation (GDPR) of the European Union, as well as equivalent regulations in other regions.

This means that:

  • Credential holders have the right to access, rectify, or delete their data
  • No data is processed without explicit consent
  • Technical and organizational measures are applied to protect information


Additionally, POK offers data processing agreements (DPAs) for institutions that require them for internal policies or legal requirements.

No, except in cases where the user explicitly authorizes it, such as when integrating the credential into LinkedIn or an external system.

POK does not sell, rent, or share information from issuers or recipients with third parties for commercial purposes.

In technical integrations (API, LMS, HRIS), data exchange is limited to what is strictly necessary for the service’s operation, always under encryption and permission control.

The POK privacy policy details how information is collected, used, and protected, reinforcing the commitment to security and transparency.

POK offers a transparent and flexible pricing model:

  • In the free (Web2) version, you can issue and verify unlimited digital credentials at no cost, without expiration, and without commitment to stay
  • In the NFT (Public Blockchain) version, you purchase credential packages based on your needs, with no minimum obligation and no credit expiration


This means you can acquire only what you need, at your own pace, avoiding unnecessary fixed costs. The price per credential includes blockchain registration, with no hidden fees or surprises due to “gas fee” variations.

This model adapts to both institutions issuing few credentials per year and large universities or corporations needing to issue thousands.

No. Unlike other providers that require signing long-term contracts or fixed annual packages, POK does not impose lock-in.

You can start for free, migrate to NFT whenever you want, reduce your issuance volume, or even export all your credentials and data if you decide to switch platforms.

This policy gives you full control over your investment and ensures you’re not tied to a single provider forever.

Interoperability with open standards (OpenBadge 3.0, W3C VC) guarantees that issued credentials will remain verifiable in the future, even outside POK.

Yes. POK allows using both versions in parallel within the same account.

This is useful, for example, for institutions that want to issue internal credentials in the Web2 version at no cost while also offering NFT credentials to graduates or premium programs.

The administration panel allows managing both modalities in a unified way, without duplicating processes or losing traceability control.

For the purchase of NFT credentials, POK accepts:

  • Credit or debit card (Visa, Mastercard, Amex)
  • Bank transfer
  • Local payment methods depending on the country (e.g., Pix in Brazil, SPEI in Mexico, Electronic Payments in Argentina, PayPal internationally)


Invoicing adapts to the needs of each institution, with the option to issue international invoices in USD or other agreed currencies.

Yes. POK offers preferential rates for non-profit organizations, small educational institutions, and social projects.

These discounts are applied after validating the requirements and allow access to advanced digital credential technology without compromising limited budgets.

Special plans can also be designed for government programs, strategic alliances, or large-scale educational projects, with conditions tailored to their scale and scope.

The implementation of POK is fast and frictionless.

In most cases, institutions can start issuing credentials the same day they create their account. The basic flow is:

  • Create the account and set up the organization’s profile (logo, legal details, templates)
  • Upload the recipient list or integrate with the LMS/CRM
  • Issue the first credential and enable its verification


If advanced integration via API or connection with internal systems is required, the time will depend on the technical complexity, but our team supports the process with guides, support, and onboarding sessions.

Yes. POK provides personalized onboarding so that the institution’s team can learn to use all the features.

This includes:

  • Live sessions via video call
  • Manuals and step-by-step guides
  • Short videos for internal training


Advanced training on NFT issuance, integrations, standards, and best verification practices can also be coordinated. The goal is for your team to become autonomous and get the most out of the platform in just a few days.

Yes. POK offers personalized demos and temporary access to the NFT version so you can test issuance, verification, and storage on a public blockchain.

In the demo, you can:

  • Issue test NFT credentials
  • Verify them on a blockchain explorer
  • Explore how end users receive and manage them


This allows you to validate the solution before investing, ensuring it fits your use case and expectations.

Yes. If you already use another digital credential platform, POK can import your existing credentials as long as they comply with open formats or their data is accessible.

Our technical team handles:

  • Converting files or metadata to the standard format
  • Maintaining original issuance and validity information
  • Verifying everything is correct before the final migration


This prevents you from losing history and allows your users to continue verifying their credentials without interruptions.

POK is designed to connect easily with the tools that institutions and companies already use, eliminating manual tasks and ensuring data accuracy.

In education, it integrates with the most widely used LMS globally:

  • Moodle
  • Canvas
  • Blackboard
  • Brightspace
  • Google Classroom
  • Open edX
  • and others compatible with LTI or standard API


This allows automatic credential issuance when a student passes a course or completes a program.

In the corporate and human resources sector, POK connects with systems like:

  • Workday
  • SAP SuccessFactors
  • Oracle HCM
  • Greenhouse
  • BambooHR
  • LinkedIn


Additionally, it offers REST API and webhooks for custom integrations with CRMs like Salesforce, HubSpot, or Zoho, or with internal academic or business management systems.

The result: faster processes, without data duplication, with real-time automatic issuance and verification.

For universities and higher education institutions, POK provides:

  • Fraud reduction: secure, verifiable credentials resistant to forgeries
  • Fast and mass issuance: integration with LMS to generate thousands of credentials in minutes
  • Graduate visibility: option to share credentials on LinkedIn, enhancing the institutional brand
  • Compliance with international standards: OpenBadge 3.0, W3C VC, European Learning Model, Europass
  • Cost savings: no expenses for paper, printing, or shipping


Universities in America, Europe, and Asia already use POK for undergraduate degrees, postgraduate degrees, micro-credentials, and continuing education programs, improving the graduate experience and the institution’s reputation.

In the corporate sector, POK:

  • Certifies skills of employees and contractors reliably
  • Complies with regulations and audits by offering traceability of who issued each credential and when
  • Strengthens employer branding by allowing employees to share achievements on professional networks
  • Integrates issuance into internal HR or training systems to automate processes
  • Reduces labor fraud risks by ensuring certificates are authentic and valid


From technical certifications to leadership programs or internal training, POK helps companies demonstrate their teams’ training and skills with verifiable backing.

Yes. POK is ideal for licenses, permits, authorizations, and official certifications issued by public entities.

NFT credentials on a public blockchain allow validity verification without relying on a central database, reducing bureaucracy and streamlining processes.

Additionally, the use of open standards ensures that credentials can be integrated into national and international validation systems, and their portability facilitates recognition across jurisdictions.

POK can also issue credentials with expiration dates and automatic revocation, which is highly useful for regulatory certifications requiring periodic renewal.

POK is the absolute leader in Latin America in the use of digital credentials and the innovation benchmark in NFT credential issuance and verification globally. Our platform is growing strongly in the United States, Europe, and Asia, establishing itself as the preferred choice for institutions seeking advanced technology, flexibility, and open standards for their certifications.

Digital credentials are verifiable certifications that validate skills, knowledge, or achievements. Unlike traditional paper certificates, digital ones are secure, easy to share, and globally recognized. At POK, we use blockchain technology to ensure their authenticity and immutability.

A digital badge is a visual and verifiable representation of an achievement, skill, or experience. Unlike traditional certificates, digital badges include metadata detailing who issued it, what it validates, when it was obtained, and how it was verified. Additionally, they are easy to share on social networks, digital CVs, and professional platforms.

Digital credentials allow you to showcase your achievements clearly and reliably on professional networks, CVs, or online profiles. Thanks to their automatic verification and metadata about your skills, they increase your job opportunities by making you more visible and trustworthy to recruiters and companies.

Digital credential software like POK allows you to issue, store, and verify academic or professional credentials securely and efficiently. Unlike traditional paper-based methods, it offers:
  • Instant verification from anywhere.
  • Protection against forgery thanks to blockchain technology.
  • Compatibility with international standards such as OpenBadge 3.0.
  • 100% digital experience, ideal for universities, companies, and organizations seeking to modernize their processes and give prestige to their graduates.

POK – Proof of Knowledge is a digital credential software company and a global platform for verifiable credentials, present in more than 20 countries across the Americas, Europe, and Asia, used by universities, training centers, companies, and governments. Our technology combines NFTs on blockchain, Open Badge 3.0, and the European Learning Model, offering maximum security, interoperability, and prestige in every issued credential.

Global impact:

  • United States
    Over 100 universities in 18 months, replacing traditional platforms thanks to innovation and the white-label model.
    “POK gave us a leap in quality in credential issuance. The interoperability and traceability with NFTs made a difference that is impossible to match” — Laura Johnson, Vice President of Academic Innovation
  • Mexico
    Collaboration with universities in Mexico City, Jalisco, and Nuevo León to improve employability and international visibility.
    “The ease of integration with our systems and one-click validation optimized processes and added more value to our certifications” — Carlos Martínez, Director of Educational Technology
  • Argentina
    Projects with leading institutions and government agencies in Buenos Aires, Córdoba, and Santa Fe.
    “Thanks to POK, our graduates now carry secure and shareable credentials worldwide” — Mariana López, Dean of Academic Innovation
  • Colombia
    Micro-credentials and blockchain diplomas in Bogotá, Medellín, and Antioquia.
    “POK not only certifies, it connects our graduates with better job opportunities” — Andrés Torres, Coordinator of Continuing Education
  • Chile
    Micro-credentials and international certifications in Santiago, Valparaíso, and Concepción.
    “Issuing credentials as NFTs positions us as leaders in educational innovation” — Paula Rivas, Academic Vice-Rector
  • Brazil
    Integration of verifiable credentials in undergraduate, graduate, and corporate education in São Paulo, Rio de Janeiro, and Minas Gerais.
    “The student experience changed radically with verifiable and portable credentials” — Felipe Souza, Director of Innovation
  • Spain
    Adoption of Open Badge 3.0 and NFT credentials in Madrid, Catalonia, and Andalusia.
    “POK gave us international visibility and ensured certifications with the highest European standards” — Isabel García, Head of Academic Innovation
  • Uruguay
    Verifiable digital credentials for academic and training institutions in Montevideo and Maldonado.
    “Our graduates now have globally recognized and verifiable credentials” — Martín Pérez, Academic Director
  • Other countries
    Presence in Peru, Costa Rica, Panama, Dominican Republic, Ecuador, Guatemala, Paraguay, Portugal, France, Italy, Japan, and Australia, always with the same goal: to guarantee secure, verifiable, and valuable credentials anywhere in the world.

It is a verifiable electronic certificate that represents academic or professional achievements, with global validity.

Not necessarily: they are a modern complement that ensures authenticity and portability.

Because it is the most innovative and reliable platform, issuing on blockchain with international standards.

Yes. Issuing institutions have full control to revoke credentials at any time. The revocation is reflected immediately on the platform and in public verification, remaining recorded and visible to any third party who checks the credential.

The credential is marked as invalid and can no longer be presented as valid. On the public verification page, the message clearly states: “This credential has been revoked by the issuer.” This protects employers, universities, and verifying entities from validating incorrect certificates.

No. Personal data is never recorded on the blockchain. Only a cryptographic hash (a mathematical fingerprint) is registered, which allows verifying the authenticity of the credential without exposing sensitive information.

POK applies a privacy-by-design approach:

  • Personal data is protected on encrypted servers and only shown if the user shares the credential.
  • Complies with GDPR, Argentina's Law 25.326, and regional data protection regulations.
  • Credentials are not forced to be public: control is always in the user's hands.

Yes. In your POK digital wallet you can:
  • Choose which credentials to display.
  • Share each credential with a unique link.
  • Revoke access at any time.
  • Configure your verifiable profile to decide which credentials appear publicly.

Currently, POK allows selective presentation: sharing individual credentials without exposing your entire wallet. Soon, technologies like Zero-Knowledge Proofs (ZKP) will be integrated to allow showing only specific attributes (e.g., validating a skill without revealing the final grade).

No. A credential issued on the blockchain cannot be altered or deleted. Institutions only have the option to revoke it, but never to modify its content.

POK uses blockchain (Ethereum, Polygon, LACNet) to anchor the validity of each credential. Cryptographic hashes are stored that allow verifying that the document has not been altered and comes from the correct institution.

POK has secure recovery processes, technical assistance, and institutional support to restore access. Security measures such as multi-factor authentication and identity verification are always respected to protect user information.

Start recognizing achievements with POK!