Cryptocurrency and railway semaphore: what they have in common

1. Step 1. Cryptocurrency — uses — Cryptography. Cryptocurrency rests on cryptography: signatures and hashes protect transfers.
2. Step 2. Cryptography — is used in — Turing’s Bombe. Cryptanalysis of Enigma.
3. Step 3. Turing’s Bombe — has part — Relay. Electromechanics.
4. Step 4. Relay — is part of — Traffic light. Relay controllers.
5. Step 5. Traffic light — evolved from — Railway semaphore. The first traffic light was a railway-style semaphore.

Open Evothings