One of the most useful and nifty idea I saw today. Time is very important to the blockchain and it's one of the biggest selling points of Hashgraph. Time can complicate cryptocurrency development a lot and even if one blockchain solves it, it only helps that particular blockchain. Most of the time blockchains have to depend on oracles and the quality of results can vary.

• Everything is easy to use and verify
• No real learning curve and in-browser usage
• Can support multiple blockchains
• OpenTimestamps scales indefinitely
• Decentralized and publicly auditable
• Used by many companies already
• Great GitHub page

I doesn't do much. It doesn't promise the world. It is easily achievable. It solves a very important problem. It is simply an excellent Hunt!