CryptoProof – post proofs to the Ethereum blockchain for free

In plain words

CryptoProof was a free timestamping service that allowed users to post proofs to the Ethereum blockchain. Operating from 2018 to 2021, it served individuals and organizations seeking to record and verify information on the blockchain. The service became unsustainable as Ethereum transaction fees increased. The project is currently on hold but may be revived when zero-knowledge rollups become available as a solution to reduce costs.

written from the facts on this page · September 2026

From the sources

CryptoProof ran from 2018 to 2021, as a free timestamping service on Ethereum, built by jonas.eth . As transaction fees picked up, running CryptoProof as initially, naively designed became unsustainable. The idea is now on hold. It likely will be revived as zk rollups become available. Feel free to contact me for any inquiries aboutfrom cryptoproof.org

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