Defcon23 gifted me the coins in 2016 because I was doing a book giveaway at the time on the Bitcoin.com Forum.
I'm a mod over there (nandibear - https://forum.bitcoin.com/nandibear-u4151/) , although nowadays (for a while now) they (whoever really runs Bitcoin.com now) have made it impossible to post, they claim it's broken and cannot be fixed.
Here's the book giveaway thread:
Free books! Bitcoin book review - episode 2 - Decentralized Applications: Harnessing Bitcoins Blockchain by Siraj Raval