4:42 Introduction - Blockchain is like a wax seal
10:45 SHA256 makes it very difficult to find two messages with the same commitment
12:01 What is a blockchain?
15:35 Mining
20:24 Q&A
24:58 No one wants B2X coins/Fraud selling something as Bitcoin
29:40 Why do we need blocks, can't it just be single transactions?
35:00 Timechains
40:42 Thoughts on altcoins/Decentralized routing in lightning network