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 Base58 Ships Its Crypto + Digital Signatures Course for Bitcoin Developers

"In this class you'll learn where private/public key pairs come from, implement ECDSA, learn everything there is to know about sighash flags (including the first ever tutorial for how to implement them!) The class ends with classic op-multisig!"

https://www.nobsbitcoin.com/base58-crypto-sigs-online-course/ 
 That picture... Um.