bitcoin was originally proposed in a white paper, which was published to a mailing list for cryptography enthusiasts. what year was the paper sent to the mailing list? (Oct 31, 2009)

the code that make bitcoin work was released later. when was the first version of bitcoin software released? (Jan 3, 2009)

the bitcoin whitepaper is famous for explaining how to solve what difficult computer science problem for digital currencies that are transacted peer to peer? (the double spend problem; eg how to make sure only one person gets the money at a time)

bitcoin is a blockchain. on average, a new bitcoin block gets added to the chain every how many minutes? (10m)