What is a nonce?

A nonce is a random number which should only be used once in cryptographic operations.

Why do I need to submit a transaction?

In sproof, each change of your profile is represented by an event. Multiple events can then be embedded into a single transaction. In order to submit your events to the blockchain you need to digitally sign them with your private key. Therefore, you need to enter your passphrase before your events can be send to […]

What is the sproof explorer?

The sproof explorer shows all information which is publicly stored on the blockchain and in ipfs. The explorer can be used to view all sproof profiles, documents, transactions and events. Additionally, the explorer provides the functionality to verify if a document, e.g., a PDF file issued via the sproof network.

Can I register sensitive documents?

sproof services only store and sign a hash reference of your data. As long as you do not choose to store your document publicly you may register sensitive documents, as they are not publicly accessible via sproof.

Can I delete a public document?

Short answer. No, you can’t. Long answer: Blockchains are append-only databases. Once a transaction has become part of the blockchain it is practically impossible to delete that data. sproof only stores hash references in the blockchain and without the original data it is impossible to learn anything about the document. However, you may choose to […]

What is a Web of Trust?

A Web of Trust (WoT) is a network of confirmations. Each member of a WoT is allowed to confirm each other user. This means for sproof, that each profile can confirm all other profiles. You can confirm profiles of entities you know and trust. Similarly, the strength of your profile increases if you collect confirmations […]

What is a public key?

A public key is used in asymmetric cryptosystems and is needed to verify digital signatures or to encrypt data. There always exists a cryptographically linked private key to a public key.