"Not your keys, not your coins." The phrase cuts through crypto like a knife. Simple. True. Final. Whether you're new to crypto or a veteran, understanding how we got here matters. Picture this: someone hands you a series of random letters and numbers. These characters control everything you own on the blockchain. Lose it, all is gone. Share it, all is stolen. This was true in 2009. It's still true today. The core challenge remains: how do we put cryptographic keys in everyone's hands? T...