Found this old email from Sep 2016, just after OpenTimestamps came out:

“I'm cautious about making bold statements about OpenTimeStamps because the

Github commit history shows that until four weeks ago, you had not updated

the code since 2013. The project looks incomplete and you're probably

making changes on a daily basis. The many customers of Tierion find

Chainpoint perfectly suitable for high volume applications.”

Since the SEC shutdown Tieron and forced them to give back all the money from their token sale; OpenTimestamps is still going strong.