Hash function and camera: what they have in common

1. Step 1. Hash function — is used in — Blockchain. Blocks are linked by hashes.
2. Step 2. Blockchain — uses — Internet. A peer-to-peer network.
3. Step 3. Internet — has part — Optical fibre. The backbones are optical fibre.
4. Step 4. Optical fibre — is part of — Endoscope. Flexible endoscopes use optical fibre.
5. Step 5. Endoscope — has part — Smartphone camera. Video endoscopes.
6. Step 6. Smartphone camera — evolved from — Camera. A smartphone camera keeps the layout of a camera: a lens forms an image on a light-sensitive surface.

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