Blockchain and bell: what they have in common

1. Step 1. Blockchain — is a kind of — Database. A blockchain is a database copied by many participants, so its records cannot be changed in secret.
2. Step 2. Database — evolved from — Hollerith tabulator. Processing large datasets began with tabulators.
3. Step 3. Hollerith tabulator — uses — Punched card. The 1890 census data was encoded on punched cards.
4. Step 4. Punched card — works like — Pinned cylinder. Pins on a cylinder and holes in a card are two ways of recording a sequence for a machine.
5. Step 5. Pinned cylinder — is part of — Carillon. Automatic carillons have a pinned drum.
6. Step 6. Carillon — has part — Bell. Bells.

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