Ask HN: Resources for Cryptography and Cryptocurrencies

I'm an ex-physicist (theory) looking to learn more about cryptography and cryptocurrencies. Much of the stuff I can find on cryptography are general purpose textbooks that start from the beginning with cyphers etc. For the cryptocurrency side I generally find stuff for the non-technical audience or for engineers (focused on implementation), but not much for the more mathematically oriented audience.

Can someone suggest a good thorough primer on cryptography and cryptocurrencies that discusses things from a more mathematical perspective? Ideally something that nonetheless doesn't assume too much familiarity with the field. I'm imagining a 50 page pdf called something like "A primer on cryptography and cryptocurrencies for physicists".