[Lecture 3] Fall 2018 Blockchain Fundamentals: Bitcoin Mechanics and Optimizations

[antdqs]

Very good and instructive, I wish we could hear the questions better.

[MartinThoma]

5:33 Continues after break with Sigs, ECDSA, And Addresses
1:21:30 MultiSig

[kevingzhang]

I forgot but I remember I read some article explaining why BTC use SHA256^2, there was a reason. I will post later if I can find it again.

[ericdean]

"...relies on pre-image resistance and so is not vulnerable to birthday attacks, a generic method of hardening SHA1 against the birthday collision attack is to iterate it twice. A comparable attack on SHA256 does not exist so far, however as the design of SHA256 is similar to SHA1 it is probably defensive for applications to use double SHA256"

[musicminded]

29:22, when i heard this sentence, i just thought to myself computational language is so weird