[DelightOne]

Are there ready-to-use blockchain libraries to simply create such a blockchain or does everything have to be custom-written and tested manually -> requiring the developer be an expert?

[cottenio]

Apparently it was a valuable enough idea to Amazon that they spun it up as a service in AWS: QLDB.

[palata]

Note: valuable as in "people are willing to pay for it", not as "it is solving a use-case better than alternatives"