Concept, design and development of hash2exist.fprckr.com.

This application allows you to generate proofs of existence for any file. It does so by generating a SHA-256-hash of your file and storing it in a transaction on the Bitcoin-Blockchain. All it needs is the file and a small fee to fund the process. By being in possesion of the file that is able to generate the matching hash, you can validate your file must have existed before the transaction was made and has not been changed.