Initial version: 2024-03-28
Last update: 2024-03-28

I try my covers to be not abstract paintings but photos of some real things related somehow to the book topic. In case of blockchain technology natural candidates are sequences of things lying in the form of chain. It is so obvious that I wanted to avoid it. I asked myself what, except "chainity", is important in blockchain?

Blockchain is a kind of ledger, constantly growing as new transactions are added into it which is:

• Permanent – data once written, stays there forever.
• Immutable – data written cannot be removed or modified.
• Chronological – it keeps track of the history of a data in the sense of a strict sequence of events; you not add data but rather append it.

Permanent, immutable and chronological – you can try to break one of theses property. After all, anyone who wants has free access to the blockchain. Even if you succeed, you will always leave a visible mark. This cannot be done without being noticed by others.

As I was thinking about this, I remembered how cut wood is stored after felling. Woodcutters stack cut pieces of wood on top of each other, forming a regular shape. When they are finished, they use spray to mark one of the walls with a continuous line close to the outside. Of course, this method does not prevent the tree from being stolen, but if it does happen, it is immediately visible to everyone passing by. You cannot unnoticed take a stump from this pile, change their order or add a new one. Pure application of a blockchain technology in our everyday life – I thought to myself. And hence this cover.