<p>Each block contains the hash of the previous, which is unpredictable. Also, the transactions in each block themselves are unpredictable because one can't tell who is paying who and how much.</p>

CC BY-SA 3.0
2018-01-19T14:52:34.957Z
2018-03-17T02:36:01.280Z
2018-03-17T02:36:01.280Z
Claris
<p>How does bitcoin do it to generate an (upredictable) hash in each new block with sufficient randomness so that no one can precompute it?</p>

<hash><proof-of-work>
Source of entropy for PoW hash
ranchalp
# Source of entropy for PoW hash

(Asked by: username_0 on 2018-01-19)

How does bitcoin do it to generate an (upredictable) hash in each new block with sufficient randomness so that no one can precompute it?

**Tags:** hash, proof-of-work


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## 1 answers

### Answer by username_1 on 2018-01-19. Score: 2

Each block contains the hash of the previous, which is unpredictable. Also, the transactions in each block themselves are unpredictable because one can't tell who is paying who and how much.


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