Proof of existence vs Sakia

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.

Sakia is a free and open-source desktop wallet for the cryptocurrency Monero. It allows users to securely send and receive Monero with privacy features like ring signatures and stealth addresses. Sakia is available on Linux, Mac, and Windows.