A small example to understand block chain __ block chain

The following is an example of an accounting block chain.

programme I:
Lao Wang is responsible for bookkeeping, in charge of every account in the village, very stable, no one doubts.
Miserable, old Wang was old green found that the inside of the accounts, old Green told the whole village, so to modify the scheme. Use scenario two below.

Programme II:
The people in the village decided to pick a bunch of trustworthy people and take turns to keep the accounts, and the people had old A, old B, old C, old and so on (anyway).
The old letter seems to have found a routine, old a first revise the inside of the accounts, and then deliberately modify the page damage, others still learn sample. The villagers certainly disagree, so the following scenario three appears.

Programme III:
Using a method, if the accounts are changed, each book must be revised.
It seemed that everything was steady, but every Zhangfang's husband was tired and didn't want to do it.
In view of this, the villagers have proposed other programmes, the emergence of programme four.

Programme IV:
Every time the accounts are changed, they roll the dice, elect a Mr. Zhangfang to keep an account, and give the Zhangfang a reward so that everyone will scramble to grab the record.

Well, this is a good way, yes, this is the embryonic form of the block chain.