Tim Bray made a comment at re:invent this week that most of Amazon's internal work loads rely on DynamoDB and a ledger database that is the pre-cursor to the ne

Tim Bray made a comment at re:invent this week that most of Amazon's internal work loads rely on DynamoDB and a ledger database that is the pre-cursor to the new QLDB service Amazon released this week. To qualify this, when Tim used the word 'most' I don't know if he meant "most data stored" or "most DB instances". He also didn't give any percentages, so it very well could be 99% Dynamo and 1% ledger DB. Lastly, Bray didn't include Aurora or Redshift in that list of "most used database at Amazon", but Dr Vogel's keynote alluded to a ton of internal Aurora usage. So, at least some people are claiming successful usage of blockchain in production. It's just not clear how much. Amazon seems to think there is a future in it, since they just released 2 new blockchain related services this week.