Abstract
The paper proposes a trusted and secure e-service that can be treated as a durable medium. The presented approach utilizes a blockchain database (managed by the trusted third party) combined with the cryptographic methods (signing with an electronic seal and data encryption). The service is mainly oriented towards the large financial institutions (e.g., banks) that require agreements on a document with a large number of customers, but it can also be applied for other enterprises or industrial areas.
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