How a simple API call can enhance legal validity of your documents
Enhance the legal validity of your documents with a single API call. Explore how MultiSign enables secure, eIDAS-compliant digital signatures and long-term trust for digital transactions.
The digital journey towards trust
It has been just 10 years since 2016, when we lived in an era defined by clicks, views and time spent online. By 2026, the global approach to the internet has completely changed. Trust, credibility and concrete evidence now strongly influence decisions. Today’s users rigorously filter content, seek immediate confirmation and abandon anything that seems unclear or risky.
Whilst speed and usability have become inescapable parts of our digital lives, individuals and organisations alike are increasingly seeking security and the ability to trust. The real battleground is no longer just attention and visibility; trust has become an indispensable factor in decision-making, both in everyday life and in business.
The pioneers of digitisation once claimed that anything on paper could be digitised. Early progress was cautious, held back by limited regulation, usability challenges and a lack of commitment. However, as the internet evolved from an alternative channel into a central pillar of society, everything that defined our analogue existence has gradually and irreversibly transitioned into the digital world.
Ensuring trusted, seamless digital journeys
The rapid evolution of internet services has driven companies to deliver faster transactions and smoother user experiences, responding to growing demands for mobility, convenience and efficiency.
Onboarding new customers quickly and securely is now essential to delivering a truly outstanding digital journey. As electronic services scale, organisations increasingly ask:
- How can I verify the identity of a counterparty in a digital transaction?
- How can I ensure full legal compliance when operating electronically?
- How can I transfer the legal validity of agreements and certifications from paper to digital formats?
The answer lies in the adoption of eIDAS-qualified trust services, which have enabled a fundamental shift towards secure, compliant and cross-border digital interactions within the European digital market.
From compliance to long-term trust: the power of API-driven trust services
Today, achieving compliance is no longer enough. Organisations must ensure that their digital documents remain valid, verifiable and legally enforceable over time.
This is where advanced solutions like the MultiSign API come into play. With a simple API call, organisations can integrate powerful trust services directly into their systems, automating the application of qualified electronic signatures, seals and timestamps.
By leveraging API-driven trust services, businesses can:
- Guarantee the authenticity and integrity of digital documents
- Ensure legal validity under eIDAS regulations
- Extend the long-term evidential value of documents
- Automate workflows without disrupting existing systems
- Deliver secure, seamless user experiences
MultiSign: empowering eSignature generation
Embed qualified and advanced electronic signature (QES/AES) capabilities directly into your business processes — fast, secure, and fully compliant with eIDAS regulations.
Incorporate a qualified electronic signature process into your document workflows without:
- costly upfront subscriptions to platforms like Docusign or Adobe Acrobat Sign,
- lengthy and complex system integration projects,
- relying on inefficient “download, sign, and re-upload” approaches.
MultiSign provide a complete API-driven framework for managing digital signatures and electronic seals in the cloud.
- ✔ Fully eIDAS-compliant
- ✔ Certified under ISO 27001, ISO 27017, and ISO 27018
- ✔ Designed for secure, high-volume, enterprise-grade signing operations
Seamless eSignature integration at scale
MultiSign is engineered for rapid and cost-effective integration of Qualified Electronic Signatures (QES) and Advanced Electronic Signatures (AES) into organizational workflows — enabling to collect legally compliant eSignatures quickly, securely, and at scale.
It integrates seamlessly with leading platforms such as Microsoft Sharepoint, Docusign, Adobe Acrobat Sign, Signiflow, Signaturit and many more and with EU Qualified Trust Service Providers including TrustPro QTSP, ensuring interoperability across B2B and B2C digital signature and sealing services.
MultiSign complies with the CSC API V2.2 developed by the Cloud Signature Consortium, a non-profit association comprising industrial and academic organisations committed to promoting interoperable, cloud-based digital signature solutions. The CSC API V2.2 supports integration with standards such as the eIDAS Regulation (910/2014) and the European Digital Identity Framework, and is designed to work with established frameworks such as OAuth 2.0 and OpenID for verifiable credentials.
Secure Architecture: Data Never Leaves Your Network
The MultiSign Proxy module provides high-performance RESTful and SOAP APIs while preserving data sovereignty:
- Only the cryptographic hash is transmitted for signing
- Original documents remain securely within your infrastructure
- Full privacy and integrity are guaranteed by design
Key Features
- Local and secure signature integration
- Remote and automatic signing with strong authentication (OTP, mobile token, SMS OTP, etc.)
- APIs for AES and QES with one-shot (disposable) certificates
- Support for high-volume, automated signing workflows
- Cloud-ready and on-premise deployment options
Future-proofing digital transactions
As digital ecosystems continue to expand, organisations must move beyond basic digitisation towards building trust-first digital infrastructures.
Integrating trust services via APIs enables businesses to future-proof their operations by embedding compliance, security and legal assurance directly into their digital processes, and it becomes a strategic step towards:
- Strengthening customer confidence
- Reducing operational risk
- Ensuring long-term document validity
- Supporting cross-border digital interactions
Conclusion
In a world where trust defines success, organisations must rethink how they manage digital transactions. By combining usability with robust trust services, businesses can deliver experiences that are not only fast and convenient, but also secure, compliant and legally sound.
With the right tools in place, enhancing the legal validity of your documents — and ensuring it endures over time — is now just one API call away.
An eIDAS-compliant digital signature is a legally recognised electronic signature within the European Union, defined under the eIDAS regulation. It ensures the authenticity, integrity and non-repudiation of digital documents. Using qualified electronic signatures allows organisations to conduct cross-border transactions with full legal validity, equivalent to handwritten signatures.
A eSign API enables businesses to integrate digital signing capabilities directly into their systems and workflows. With a simple API call, organisations can automatically apply electronic signatures, seals and timestamps to documents, eliminating manual steps, reducing errors and ensuring consistent legal compliance across all transactions.
Long-term validity is achieved by applying qualified timestamps, maintaining certificate validity and using trusted archiving solutions. Advanced trust service APIs, such as MultiSign, ensure that documents remain verifiable and legally enforceable even years after signing, protecting organisations against future disputes or compliance risks.
MultiSign is a digital signature service that enables organisations to quickly and cost-effectively integrate advanced and qualified electronic signatures into their workflows. It provides high-level RESTful and SOAP APIs for seamless integration, allowing businesses to automate signing processes while keeping documents securely within their own network.
Yes, MultiSign is fully compliant with eIDAS regulations and is certified under ISO 27001, ISO 27017 and ISO 27018 standards. It supports strong authentication methods such as OTP tokens and mobile verification, ensuring high levels of security, identity assurance and legal validity for digital transactions across Europe.
