sproof sign in a nutshell

sproof sign document illustration

Collect signatures fast and easy or simply sign a document yourself with sproof sign 📃🖋️

Not only digital signatures can be collected, but also handwritten signatures can be added to the document with this tool.

Learn more about sproof sign in this short

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Try it out for free and let us know what you think!
➡️ https://sign.sproof.io/

How to issue secure digital documents

issue secure digital documents video thumbnail

With sproof, issuing secure digital documents is as easy as a drag-and-drop.

In times of #homeoffice, secure #digitaldocuments get even more important 📃 🔒 How do you send a valid confirmation of enrolment to a student? Or how does your business partner get a verified version of the urgently needed contract?

With sproof, this is as easy as a drag-and-drop:
▶️ Drag & drop your document to the sproof app (https://app.sproof.io)
▶️ Click “Register Document”
▶️ Submit the transaction by entering your passphrase

If you have questions, we are available for you online 💬 📧

#workfromhome #technology #digitization #digitalsolution #blockchain #digitaleszeugnis #timestamping #FlattenTheCurve

We need your consent to load the content of YouTube.

If you click on this video we will play the video, load scripts on your device, store cookies and collect personal data. This enables [Google Ireland Limited, Irland] to track activities on the Internet and to display advertising in a target group-oriented manner. There is a data transfer to the USA, which does not have EU-compliant data protection. You will find further information here.


sproof joins the German „Netzwerk Digitale Nachweise“

Netzwerk Digitale Nachweise Logo

The Netzwerk Digitale Nachweise was founded in 2019 as part of the “blockchain” coordination project of the German IT planning council. Main focus is the use of blockchain technology for issuing and verifying certificates digitally. Together, proposals for Germany-wide standards are being developed. sproof is the only Austrian company on board.

The network is coordinated by Helmut Nehrenheim, consultant in the Ministry of Economics, Innovation, Digitisation and Energy of the State of North Rhine-Westphalia, and Guido Bacharach, Head of Strategy and Digitisation at the Foundation for University Admissions.

Clemens Brunner, CEO of sproof: “We are proud to be part of this exciting network and look forward to working together to shape the digitisation of certificates.”


Have you tried the sproof testnet yet?

Try sproof for free!

Discover digital signatures and the potentials of sproof at no risk with the sproof testnet:

➡️ Explore all sproof features 
➡️ Play with timestamping a document 
➡️ Ready to integrate sproof into your existing application? Use the testnet so see if everything’s working fine

Discover the potentials of sproof at no risk and create a free testnet profile now.

Get your free testnet profile now:

sproof joins Blockchain Bayern e.V.

Blockchain Bayern e.V, Wir bringen Blockchain in Bayern voran.

The sproof GmbH has recently become a member of Blockchain Bayern. The non-profit association, chaired by Prof. Dr. Florian Matthes, provides an umbrella for various activities regarding blockchain and related technologies. With sproof as a member, information and networking events are now also taking place in Salzburg.

Erich Höpoldseder from sproof is a member of the Blockchain Bayern working groups “digital identities” and “business models”. “We are very pleased to be able to play an active role in this association,” says Höpoldseder. A first event is already planned for January.

Working group meeting in Salzburg

Together with the Centre for Secure Energy Informatics, sproof is organising a meeting of the Blockchain Bayern e.V. working groups “digital identities” and “business models” on 23 January 2020 at the Salzburg University of Applied Sciences. As an introduction to the working groups, the basic principles and the functionality of blockchains will be presented and critically discussed together by playing a blockchain game. “In this game we build up an analog blockchain which helps us understand how blockchains work. Instead of using computers, the participants do the calculations (POW) themselves,” says Clemens Brunner, CEO of sproof.

About Blockchain Bayern e.V.

Blockchain Bayern is located at the Technical University of Munich (TU Munich) and offers research and exchange of experience on the technical basics and fields of application of the topics distributed ledger and blockchain. The non-profit association promotes the interdisciplinary networking of science, business, start-ups and politics and organises informative and networking events. Blockchain Bayern is also open to non-technology experts and thus promotes knowledge creation in small and medium-sized companies.

Meet the sproof team at the Summit Industrie 4.0 on 12 Dec 2019 in Linz

SUMMIT INDUSTRIE 4.0 Österreich 2019, regional-gemeinsam-erfolgreich

Are you looking for a solution to manage your audit trails? Come meet us together with COPA-DATA at the Summit Industrie 4.0, the yearly conference of the platform industry 4.0 Austria, in Linz! 🏭 🗓️ We are happy to look into your use cases and curious about your feedback 🔍

Summit Industrie 4.0
12 December 2019, 10:30 – 18:30
OÖ Kulturquartier Linz
OK-Platz 1, 4020 Linz

You will find us in the exhibitor area.

Big thanks to ITG – Innovationsservice für Salzburg for supporting us at this event!

Three reasons why digital certificates require a public blockchain

3 reasons why digital certificates require a public blockchain text header

When building blockchain-based applications, discussion often comes to the point of whether a public or private blockchain should be used. sproof clearly takes the position for public blockchains for tamper-proof digital certificates and documents. Here is why.

sproof is a research-based company and our decisions are carefully evaluated and scientifically backed. These are the three reasons for using a public blockchain within the sproof network:

ReasonPublic BlockchainPrivate Blockchain
No trusted parties needed😍😢
Tamper-proof timestamping😍😢
Global and public registry😍😢

1. No trusted parties needed for maintaining the blockchain

A public blockchain serves as a decentralized data storage which is distributed over all participating blockchain nodes. These are referred to as “operators” or “miners”. Public blockchains are generally designed to be permission-less, i.e., anyone can act as a user and write data into a public blockchain. This can be done without the need for prior registration at some organization or authority. It is also not necessary to participate as an operator or miner. A so-called “consensus algorithm” allows all nodes to agree on a globally common state.

😎 sproof uses this feature in order to build a platform where anyone (e.g., universities, enterprises, etc.) can join without operating a blockchain themselves and without being dependent on a specific platform operator.

2. Tamper-proof timestamping

Since all nodes agree upon a common state at each point of time, their agreement corresponds to a global timestamping service. Thus, writing data to a public blockchain automatically assigns a timestamp to that data. Cryptographic tools (such as hash functions) and the designs of the blockchain and consensus mechanism, respectively, assure that, in practice, the data cannot be changed later on.

😎 sproof makes use of tamper-proof timestamping for assigning an unforgeable and verifiable timestamp to documents and data without the need for relying on a single, possibly forged, source for timestamping.

3. Global and public registry

The globally agreed-upon common state of data within the blockchain is replicated among all participating nodes. Thus, the data is publicly available and accessible by everyone.

😎 sproof publicly stores references to data, which are needed to verify the authenticity and integrity of documents or data and their issuers in this public registry. The document itself is not published publicly. Verification can then be done by anyone in possession of the original digital document. This verification neither involves sproof nor the issuer and the process is completely decentralized.

Please refer to the peer-reviewed sproof paper for technical details [1].

[1] C. Brunner, F. Knirsch, and D. Engel, “SPROOF: A platform for issuing and verifying documents in a public blockchain,” in Proceedings of the 5th International Conference on Information Systems Security and Privacy (ICISSP), Prague, Czech Republic, 2019, pp. 15-25. Read the full paper