# <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) --- - 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)