Sign your documents and data digitally with sproof.
Fast, easy and secure.
Overview
sproof allows you to easily issue verifiably secure digital documents. Digitally sign and manage digital documents with our web app with user friendly drag and drop or use our easy-to-integrate API for signing digital documents with any application.
- Create a digital document in your application
- Drop the document in our web app or call the sproof API to sign your document
- Share or archive the document
- Anyone in possession of your digital document can easily verify your signature
sproof is easily integrated in existing applications. Download and install the Docker container provided and make a single API call to verifiably secure digital documents.
Paper & Code
Read the sproof paper for full insights into the sproof protocol and how the features of blockchain are employed. This peer-reviewed paper is published at the conference ICISSP 2019.
sproof code is open and freely available on GitHub. Browse the sproof source code and documentation and learn how to integrate sproof in your applications.
Description
The sproof web app and the sproof API provides three basic actions:
- Register. Register a digital document and sign it with your unique signature. The document can either be published in a decentralized storage along with a digital signature secured in a blockchain or your document remains private and only the digital signature is published alone.
- Revoke. Revoke any previously signed documents. This is useful if documents have expired or are rendered void for any reason.
- Verify. Check the integrity and authenticity of a digital document. If the document is valid you will receive information about the issuer.
Pricing
Get the package that suits your needs. Registrations of documents are aggregated and uploaded to the blockchain in a transaction. Additional registrations and uploads can be purchased at any time.
SMALL
€ 153/month
- up to 200 events/month
- 1 daily transaction
Price additional events: € 0.30
Price additional transaction: € 3.00
MEDIUM
€ 262/month
- up to 1.000 events/month
- 1 daily transaction
Price additional events: € 0.20
Price additional transaction: € 2.00
LARGE
€ 562/month
- up to 5.000 events/month
- 1 daily transaction
Price additional events: € 0.10
Price additional transaction: € 1.00
Prices do not include VAT. We offer discounts and special packages for academia and charity organizations. Please contact us.
Register now and issue your first documents.