Bravo for the well handled issue that would have been devastating to XMR altogether should such information got into the wrong hands at the wrong time.
Very proud of the development team.
Don't want to rain on the parade... and this is (most likely) very cool news indeed.
But is there some detail/proof forthis assertion?:
2017-02-20: The Monero blockchain is scanned to see if this had ever been exploited; thankfully it had not and the blockchain is intact.