Wordproof
WordProof is an Amsterdam-based blockchain timestamping SaaS for publishers, content creators and online retailers that anchors SHA-256 content hashes on EOSIO, Telos or Ethereum and exposes them via WordPress/Shopify/Drupal plugins and a REST API.
- Company typePrivate
- Founded2019
- HeadquartersAmsterdam, Netherlands
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What Wordproof does
WordProof B.V. is an Amsterdam-based private company founded in 2019 that operates a blockchain-based content timestamping service primarily targeted at digital publishers, content creators and online retailers. Its core product, WordProof Timestamp, hashes the metadata of webpages, articles, images and documents using SHA-256 and writes the resulting hash as a transaction on public blockchains (EOSIO, Telos and/or Ethereum), producing immutable, downloadable proof-of-existence certificates. An optional 'Time Machine' feature chains each subsequent revision hash back to the prior one, enabling a fully verifiable edit history. Timestamps are output as Schema.org JSON-LD (with a proposed BlockchainTransaction extension under review at schemaorg/schemaorg#2756), so search engines and social platforms can ingest content-integrity signals natively; Presearch has become the first search engine to label timestamped pages in search results.
The product is delivered through open-source plugins and apps for WordPress, Drupal and Shopify (covering ~48% of all websites), with Joomla, Magento and Lightspeed extensions in development; a public REST API with HMAC-SHA256-signed webhooks; a StencilJS-based UI Kit (@wordproof/uikit); and a WordPress SDK. In July 2023 the company launched Content Core, a private 'Authentic AI' add-on that performs retrieval-augmented generation and podcast transcription over a publisher's own content archive. WordProof monetises via tiered self-serve SaaS subscriptions (Free / €9 Hobby / €24 Professional / €49 Business per month, with annual discounts and a 100% money-back guarantee) plus custom Enterprise contracts and API access sold on a per-case basis. Named reference customers include NRC Handelsblad (2.5M articles timestamped via the API at 246,400/day), indebuurt/DPG Media (100,000+ articles), Amsterdam Vintage Watches, Blom & Blom, Stampwallet and Utopia Capital Research. Distribution leverage comes from open-source roots in the WordPress community, a stake taken by Yoast SEO founders Joost de Valk and Marieke van de Rakt, a native Yoast SEO 19.2 integration, and high-profile validation including the €1M first-place finish in the European Commission's 'Blockchains for Social Good' EIC Horizon Prize (2020) and the Dutch Blockchain Awards 'Social Impact' (2020).
Wordproof firmographics
Firmographics- Name
- Wordproof
- Legal name
- WordProof B.V.
- Website
- https://wordproof.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- WordProof is an Amsterdam-based blockchain timestamping SaaS for publishers, content creators and online retailers that anchors SHA-256 content hashes on EOSIO, Telos or Ethereum and exposes them via WordPress/Shopify/Drupal plugins and a REST API.
- Ownership category
- akta.pro rank
Wordproof industry classification
Industry- Product category
- Blockchain Content Timestamping Software
- NAICS
- Software Publishers (5132)
- SIC
- Services-Prepackaged Software (7372)
- akta.pro primary industry
- Regulatory Reporting, Tax & Audit Trails (reconciliation, provenance) (FSAPAJAI)
- akta.pro secondary industries
- Smart Contract Developer Platforms & Tooling (SDKs, APIs, frameworks, indexing) (FSAPAAAH), Interoperability & Integration Middleware (ERP/core banking connectors, messaging, APIs, cross-chain to permissioned) (FSAPAIAL)
Keywords
Where Wordproof is headquartered
LocationHeadquarters
- HQ city
- Amsterdam
- HQ country
- Netherlands
- HQ region
- Europe
Offices1 record
Markets served
Wordproof business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- WordPress subscription plans: Tiered SaaS subscriptions (Free, Hobby €9/mo, Professional €24/mo, Business €49/mo) billed monthly or annually with a 100% money-back guarantee; tier gating by number of websites and monthly/bonus timestamp volume.
- Freemium self-serve tier: Free plan (1 website, 10 timestamps/month, all post types, downloadable certificates, multilingual) used as the top-of-funnel conversion path to paid plans and Enterprise.
- Enterprise custom solutions: Custom-built integrations for organisations that must comply with internal governance; sold via the Enterprise contact form and demo flow (used by NRC, DPG Media/indebuurt, etc.).
- Content Core (private AI product): Private AI model product (contentcore.ai) that lets publishers generate drafts, smart-search and repurpose content from their own archive, positioned as an add-on/upsell on top of timestamping.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free – €0/month; 1 website, 10 timestamps/month, no bonus timestamps, all post types, text link, revision compare, download certificates, copyright claim helper, multilingual |
| Subscription | Monthly | Hobby – €9/month (or €7/month annual); 25 timestamps/month + 100 bonus timestamps, text link or badge |
| Subscription | Annual | Hobby Yearly – €7/month equivalent billed annually |
| Subscription | Monthly | Professional – €24/month (or €19/month annual); 3 websites, 200 timestamps/month + 400 bonus timestamps |
| Subscription | Annual | Professional Yearly – €19/month equivalent billed annually |
| Subscription | Monthly | Business – €49/month (or €39/month annual); 10 websites, 500 timestamps/month + 1000 bonus timestamps |
| Subscription | Annual | Business Yearly – €39/month equivalent billed annually |
| Other | Multi-year contract | More than 10 websites – contact [email protected] for custom Enterprise pricing |
Go-to-market motion4 records
Distribution channels7 records
Marketing channels11 records
Wordproof product offering
Product offeringCore offering
WordProof Timestamp is a blockchain-based content timestamping service that hashes the metadata of webpages, articles, images and documents with SHA-256 and writes the resulting hash as an immutable transaction on public blockchains (EOSIO, Telos, Ethereum) to provide verifiable proof-of-existence. The platform is distributed via open-source CMS plugins (WordPress, Drupal, Shopify), a public REST API and a StencilJS-based UI Kit, with outputs formatted as Schema.org JSON-LD so search engines can ingest the timestamps natively. A secondary product, Content Core, is a private AI add-on that lets publishers generate drafts, run semantic search and repurpose podcasts using their own timestamped content archive.
Product overview
WordProof is built around a single core platform, WordProof Timestamp, that anchors the fingerprint (hash) of web content on the EOS, Telos or Ethereum blockchain so publishers, e-commerce sites and creators can prove authorship, fight plagiarism and signal integrity to search engines. Around this core, WordProof sells a modular portfolio: the WordPress plugin (with Yoast SEO and WooCommerce integrations), official Drupal module, Shopify app, and forthcoming Joomla, Magento and Lightspeed extensions; a public REST API plus a StencilJS-based UI Kit (@wordproof/uikit) for developers; an add-on AI product, Content Core (marketed as Authentic AI), which uses private AI models over the publisher's own archive for draft generation, smart search and podcast-to-text repurposing; supporting features such as the Blockchain Certificate pop-up, Time Machine revision history, Copyright Infringement Letter Generator, Verifiable Trust badges and Schema.org structured-data output; an Enterprise tier for custom integrations; and a roadmap product, Decentralized Hosting, for cryptographically proven WordPress hosting. The whole portfolio sits inside WordProof's broader Trusted Web initiative (and ecosystem).
Differentiator
Problem solved
Functional benefit
Brands
- WordProof Timestamp: Core blockchain-based timestamping product offered via WordPress, Drupal, Shopify, Joomla, Magento, and Lightspeed integrations and REST API.
- Content Core
- The Trusted Web
Products and services
- WordProof Timestamp Flagship blockchain-based content timestamping platform that hashes webpage, article, image and document metadata with SHA-256 and writes the hash to EOS, Telos or Ethereum as an immutable proof-of-existence; bundles copyright protection, revision history (Time Machine), verifiable trust badges and Schema.org JSON-LD structured data for SEO. Targets publishers, content creators, online retailers and enterprise organisations.
- Content Core Private AI add-on product (marketed as 'Authentic AI') that lets publishers generate new drafts, run semantic smart search over their content archive, and repurpose podcasts into text enriched with Schema.org structured data; positioned as an upsell on top of WordProof Timestamp that improves E-E-A-T signals and SEO via timestamps and provenance technology.
- WordProof REST API Public REST API that lets developers integrate WordProof's blockchain timestamping service from any platform; supports bulk timestamping, HMAC-SHA256 signed webhooks for transaction confirmation and per-case Bearer-token authentication. Used by large publishers like NRC (246,400 timestamps/day) and customer loyalty platforms like Stampwallet.
- WordProof Timestamp for WordPress Open-source WordPress plugin (available in the WordPress plugin repository) that automatically timestamps posts, pages, WooCommerce products and media; comes with Free, Hobby, Professional and Business plans and includes a 5-minute setup, Yoast SEO integration for legal-page timestamping, and downloadable PDF blockchain certificates.
- WordProof for Drupal Official Drupal module developed in collaboration with partner agency SWIS and released via drupal.org; enables automatic timestamping of Drupal pages with the Blockchain Certificate pop-up. First open-source WordProof product built by an external organisation.
- WordProof Timestamp for Shopify Shopify App Store app that adds Schema.org timestamp mark-up to Shopify products, pages and articles and runs automatic timestamping every 15 minutes; reaches 4.3M+ Shopify merchants.
- WordProof UI Kit StencilJS-based open-source web component UI Kit (@wordproof/uikit) for rendering the WordProof Blockchain Certificate and SEO badges across frameworks; usable with Vanilla JS, Vue 2 and Vue 3.
- WordProof Files Document-timestamping add-on launched in May 2020 that allows files to be timestamped on the blockchain through the WordProof ecosystem.
Quantifiable outcome
- 5,834,591+ articles, media files and legal documents timestamped (homepage counter)
- +5 more outcomes
Companies that use Wordproof
Customer profileNamed customers6 records
Segments5 records
Ideal customer profiles5 records
Wordproof technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration11 records
AI capability7 records
Feature9 records
Wordproof partnerships and signals
Strategic signalPartnerships
Seven partnerships are on record, tiered core and minor.
- Yoast SEO (product integration)coreYoast SEO 19.2 shipped native integration with WordProof, allowing users to timestamp their Privacy Policy (and Terms & Conditions when WooCommerce is active) directly from Yoast SEO. Distinct from, but built on, Yoast's investment in WordProof.
- SWIScoreSWIS developed the official WordProof for Drupal module and released it via drupal.org. SWIS is a Dutch Drupal agency whose concept of open source is 'integrated in its DNA'. The Drupal module is the first open-source WordProof product built by an external organisation.
- PresearchcorePresearch, a community-powered, privacy-focused search engine, partnered with WordProof to label timestamped pages in search results — the first search engine in the world to integrate WordProof's universal blockchain-based timestamping ecosystem, showing when information was last edited.
- V-IDcorePartnered to enable on- and offline verification of vintage watches. V-ID anchors digital documents on the Fantom blockchain through the VIDT Datalink architecture; WordProof anchors online content. Together they power Amsterdam Vintage Watches' combined authenticity solution.
- SiteGroundminorSponsors powerful Managed Hosting for WordProof's own website and is publicly thanked as a partner.
- Effect.AIminorEffect.AI is translating WordProof Timestamp into many languages (Spanish, French, +15 languages for the new certificate) and was a co-organiser of the EOSIO Blockchain Developer Workshop.
- ShifterminorWordProof partner for hosting-related content protection; Shifter distributed WordProof stickers and flyers at WordCamp Tokyo and WordCamp US and published a piece about content protection with blockchain.
Scale indicators15 records
Recent moves6 records
Expansion highlights6 records
Wordproof competitors and assessment
Company assessmentEmerging players
- Story Protocol: Blockchain-based IP protocol that programmatically tracks and monetises the provenance and licensing of creative content. Comparable in applying blockchain to creator IP and provenance, but focused on tokenisable IP rights rather than content timestamping per se.
- Verisart: Blockchain-based certification and provenance platform primarily for physical art and collectibles, with expansion into digital certificates. Comparable to WordProof's Amsterdam Vintage Watches use case (physical-good provenance) and similar downloadable certificate model.
- Copyleaks: AI-powered plagiarism detection and content authenticity platform serving education, publishing and enterprise. Comparable as an adjacent content-integrity tool, though its approach is detection-based rather than blockchain-anchored timestamping.
Direct peers
- Pixsy: Image copyright protection and takedown platform that helps photographers and creators find and fight unauthorised uses of their images. Adjacent to WordProof's Copyright Protection feature for visual creators, with similar enforcement tooling.
- Numbers Protocol: Decentralized protocol for registering and verifying digital media assets via blockchain-based provenance. Closely comparable to WordProof on content authenticity, provenance, and on-chain timestamping for creators and publishers.
- Stampery (acquired by Remixd): Blockchain-anchored timestamping and certification service that lets users anchor email, documents and files to public chains. Directly comparable to WordProof's document and content timestamping service, though it has shifted focus over time.
- Custos Media Technologies: South Africa-based blockchain timestamping and content-protection platform that embeds cryptographic proofs into media files. Directly comparable to WordProof's core Timestamp product for digital content protection, copyright enforcement and proof-of-existence.
- OriginalMy: Brazil-based blockchain timestamping and digital notarization service offering proof-of-existence for documents, web pages and other digital content. Direct competitor in the same 'timestamp anything' use case WordProof serves.
Broad incumbents
- Digimarc: Established digital watermarking and content-identification incumbent serving media, retail and brand-protection customers. Comparable in tackling content authenticity and anti-piracy, but operates as a broader incumbent with proprietary watermarking rather than blockchain timestamping.
- Adobe (Content Authenticity Initiative): Adobe-led cross-industry coalition for content provenance credentials (C2PA) that competes in the same 'verifiable content' space as WordProof's Timestamping + Schema.org structured-data play. Adobe has a longstanding partnership-style relationship with WordProof (Andy Parsons has appeared on the Trusted Web Podcast), positioning CAI as a standards rival.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks5 records
Key highlights7 records
Customer concentration
Wordproof social profiles
Digital presenceWordproof compliance and trust
Trust signalCompliance1 record
Wordproof financial estimates
Financial estimateRevenue estimate
Valuation estimate
Wordproof leadership team
Management profileNumber of profiles
Profiles11 records
Wordproof subsidiaries and ownership
Company hierarchySubsidiaries1 record
Wordproof funding detail
Funding detailFunding overview
Funding rounds4 records
Investors5 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Wordproof M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Wordproof
What does Wordproof do?
WordProof Timestamp is a blockchain-based content timestamping service that hashes the metadata of webpages, articles, images and documents with SHA-256 and writes the resulting hash as an immutable transaction on public blockchains (EOSIO, Telos, Ethereum) to provide verifiable proof-of-existence. The platform is distributed via open-source CMS plugins (WordPress, Drupal, Shopify), a public REST API and a StencilJS-based UI Kit, with outputs formatted as Schema.org JSON-LD so search engines can ingest the timestamps natively. A secondary product, Content Core, is a private AI add-on that lets publishers generate drafts, run semantic search and repurpose podcasts using their own timestamped content archive.
Is Wordproof a public or private company?
Wordproof is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Wordproof founded?
Wordproof was founded in 2019. It employs 11 to 50 people.
Where is Wordproof based?
Wordproof is headquartered in Amsterdam, Netherlands, in the Europe region.
How does Wordproof make money?
Four revenue lines are on record. WordPress subscription plans are the primary driver. The others are freemium self-serve tier, enterprise custom solutions and content Core (private AI product).
Who are Wordproof's main competitors?
Emerging players on record are Story Protocol, Verisart and Copyleaks. Direct peers are Pixsy, Numbers Protocol, Stampery (acquired by Remixd), Custos Media Technologies and OriginalMy. Broad incumbents are Digimarc and Adobe (Content Authenticity Initiative).
Does Wordproof have an API?
Yes. Public REST API that lets developers integrate WordProof's blockchain-based timestamping service from almost any platform. Auth uses Bearer tokens (issued via my.wordproof.com account signup). Endpoints include POST /timestamps and POST /timestamps/bulk for submitting content for timestamping, and GET /timestamps/{id} for retrieval. Webhooks are sent by default to a webhook_url configured in the user's account, with HMAC-SHA256 signature verification using the SHA-256 hashed bearer token as the secret; failed deliveries retry up to 3 times with a 5-second timeout. Most routes are rate-limited to 60 requests per minute, while POST /timestamps/bulk allows 600 requests per minute. Responses include blockchain details such as blockchain name (e.g., eosio_main) and transactionId with link. Errors follow standard HTTP conventions (2xx success, 4xx client, 5xx server). A WordPress SDK is referenced for native integration, and a plug-and-play WordPress plugin, Drupal module, and Shopify app are available. A StencilJS-based UI Kit (@wordproof/uikit) with Vue.js (2.x and 3.x) integration support is also provided as a JavaScript SDK/component library. Developer documentation is at developers.wordproof.com/rest-api.
What industry is Wordproof in?
Wordproof's product category is Blockchain Content Timestamping Software. Its primary akta.pro industry code is FSAPAJAI, Regulatory Reporting, Tax & Audit Trails (reconciliation, provenance), with a secondary code of FSAPAAAH, Smart Contract Developer Platforms & Tooling (SDKs, APIs, frameworks, indexing). Its NAICS code is 5132 and its SIC code is 7372.