Cryptocurrency and liquid-propellant rocket engine: what they have in common

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

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