There's already a better service that timestamps files in Bitcoin. It also uses blockchain space efficiently using servers that aggregate data that must be time

There's already a better service that timestamps files in Bitcoin. It also uses blockchain space efficiently using servers that aggregate data that must be timestamped into a single Bitcoin transaction. You just need to publish a Merkle root and hold onto your Merkle proof. https://opentimestamps.org/ https://opentimestamps.org/ https://petertodd.org/2016/opentimestamps-announcement https://petertodd.org/2016/opentimestamps-announcement