Blockchain and fuel cell: what they have in common

1. Step 1. Blockchain — uses — Internet. A peer-to-peer network.
2. Step 2. Internet — is made of — Silica (sand). The backbones are silica optical fibre.
3. Step 3. Silica (sand) — is material for — Space Shuttle. The heat-shield tiles are silica fibre.
4. Step 4. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.
5. Step 5. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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