Öffi vs Proof of existence
A side-by-side look at Öffi and Proof of existence. For an in-depth review of either product, follow the links below.
Öffi
Travel & Location
Öffi is a free and open-source public transport app for Android and iOS. It allows users to search for routes, see departure times, and navigate using public transportation in cities around the world.
transporttransitschedulesnavigation
Proof of existence
Bitcoin & Cryptocurrency
Proof of existence is a service that allows you to cryptographically prove that a document existed at a particular point in time. It works by submitting a hash of the document to a blockchain, which timestamp proofs its existence.
blockchaintimestampingproofcryptography
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