How many Blockcerts issuing systems are there?

I’ve read that Blockcerts is an open standard, but when I research further I only find Learning Machine’s product.

So, is really Blockcerts an standard. How many commercial products are using Blockcerts standard?

Thank you!

Hey @aberniz,

There was a similar post not too long ago if you wanted to take a look at it:
Looking for information on Adoption of Blockcerts