Cryptography resources for programmers As a senior programmer entering blockchain projects, i'm looking for a comprehensive introduction to relevant cryptographic tools/primitives, preferably one that puts less emphasis on the math and more on the usage. 

Are there recommended resources for the mathematically uninitiated?
Sorry, I don't want to be trivial, but, aside from different implementations, interpretations, enhancements, splits, forks and fake actors, imho, I think that the foundations are all in the original Satoshi Nakamoto's Bitcoin paper and relative references.

I think that is the best starting point to understand mechanisms under the hood.

Bitcoin: A Peer-to-Peer Electronic Cash System