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# System prepended metadata

title: <center><i class="fa fa-edit"></i> 3.4 Bitcoin Blocks </center>
tags: [Blockchain]

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# <center><i class="fa fa-edit"></i> 3.4 Bitcoin Blocks </center>
###### tags: `Blockchain`
The following notes are taken from [Coursera](https://www.coursera.org/learn/cryptocurrency/home/week/2)

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- Single unit of work for miners
- Limit length of hash-chain of blocks
    - Faster to verify history

### Bitcoin Block Structure 
![](https://i.imgur.com/14KskkD.jpg)

1. Hash chain of blocks (block header)

![](https://i.imgur.com/cCpSVgI.png)

2. Merkle Tree of transaction in each block (transaction data)

![](https://i.imgur.com/MGqxPiY.png)

**Mining Puzzle Info**

![](https://i.imgur.com/vjFXfoZ.png)

### Coinbase Transaction
![](https://i.imgur.com/J7zEYzE.png)



