<blockquote>
<p>Why are transactions grouped into blocks when put onto blockchain?</p>
</blockquote>
<p>Blocks provide a way for transactions to be committed to the blockchain. They are what allow transactions to become immutable. By grouping transactions into a block, they become protected by the Proof of Work that the miner had to do in order to create the block. This means that in order for anyone to change a transaction, they must also perform the Proof of Work to modify the block too, and all blocks that come after the block a transaction was in.</p>
<blockquote>
<ol>
<li><p>Lets say we have just put a block on a chain and there are no blocks at the moment that users mine. At that moment how many new blocks will get created for users to mine? Will only one block-to-solve get created, or more of them?</p>
</li>
<li><p>If more blocks will get created (to be mined on), how will the miners distribute themselves on the blocks?</p>
</li>
</ol>
</blockquote>
<p>Mining does not work like this. Blocks are not distributed to miners to be worked on.</p>
<p>You can think of minining more like this: each miner creates a block, hashes it, and sees if it is less than the target. If it is not, they throw away the block and make a new one that is slightly different. They do that over and over until a block is found that has a hash that is less than the target. Miners will end up making quadrillions or even quintillions of invalid blocks until they get lucky and make on that is valid. Each block is unique and constructed by the miners themselves.</p>

CC BY-SA 3.0
2017-10-21T16:35:19.243Z
Hi. I realized my question is too broad so I'll separate it in more questions and post each one separately as a new question. Can you address the edited question?
croraf
CC BY-SA 3.0
2017-10-21T16:42:29.470Z
I have updated my answer.
Ava Chow
CC BY-SA 3.0
2017-10-21T16:44:23.940Z
Thx. In couple of minutes I will add related question on the site.
croraf
CC BY-SA 3.0
2017-10-21T16:20:42.010Z
2017-10-21T16:42:21.520Z
2020-06-16T11:10:03.350Z
Ava Chow
<p>Why are transactions grouped into blocks when put onto blockchain (PART 1)?</p>

<ol>
<li><p>Lets say we have just put a block on a chain and there are no blocks at the moment that users mine. At that moment how many new blocks will get created for users to mine? Will only one block-to-solve get created, or more of them?</p></li>
<li><p>If more blocks will get created (to be mined on), how will the miners distribute themselves on the blocks?</p></li>
</ol>

<bitcoin-core><protocol><algorithms>
Why are transactions grouped into blocks? (how are new blocks-to-solve formed)
croraf
# Why are transactions grouped into blocks? (how are new blocks-to-solve formed)

(Asked by: username_0 on 2017-10-21)

Why are transactions grouped into blocks when put onto blockchain (PART 1)?

1. Lets say we have just put a block on a chain and there are no blocks at the moment that users mine. At that moment how many new blocks will get created for users to mine? Will only one block-to-solve get created, or more of them?
2. If more blocks will get created (to be mined on), how will the miners distribute themselves on the blocks?

**Tags:** bitcoin-core, protocol, algorithms


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## 1 answers

### Answer by username_1 on 2017-10-21. Score: 1 | Accepted answer

> Why are transactions grouped into blocks when put onto blockchain?

Blocks provide a way for transactions to be committed to the blockchain. They are what allow transactions to become immutable. By grouping transactions into a block, they become protected by the Proof of Work that the miner had to do in order to create the block. This means that in order for anyone to change a transaction, they must also perform the Proof of Work to modify the block too, and all blocks that come after the block a transaction was in.

> 1. Lets say we have just put a block on a chain and there are no blocks at the moment that users mine. At that moment how many new blocks will get created for users to mine? Will only one block-to-solve get created, or more of them?
> 2. If more blocks will get created (to be mined on), how will the miners distribute themselves on the blocks?

Mining does not work like this. Blocks are not distributed to miners to be worked on.

You can think of minining more like this: each miner creates a block, hashes it, and sees if it is less than the target. If it is not, they throw away the block and make a new one that is slightly different. They do that over and over until a block is found that has a hash that is less than the target. Miners will end up making quadrillions or even quintillions of invalid blocks until they get lucky and make on that is valid. Each block is unique and constructed by the miners themselves.

> **Comments:**
> **username_0**: Hi. I realized my question is too broad so I'll separate it in more questions and post each one separately as a new question. Can you address the edited question?  
> **username_1**: I have updated my answer.  
> **username_0**: Thx. In couple of minutes I will add related question on the site.  

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