<p>Say there are two minersA&amp;B and each of them have produced the next block almost at the same instant. In this situation how is the network going to decide which one is the main block and abandon the other block? </p>

<p>Also, say if the txns contained by the first block are T1,T2,T3 while txns in the second block contains T2,T3,T4,what is going to happen to the uncommon transactions if either of the block get abandoned, i.e.T1or T4?</p>

<p>I am sure that from the txn pool, multiple miners would be picking up the same txns and start racing for the next block creation and insert that txn in the new block.</p>

CC BY-SA 4.0
2018-11-07T13:45:37.703Z
Possible duplicate of [What happens to extinct blockchains, and transactions inside of them?](https://bitcoin.stackexchange.com/questions/12462/what-happens-to-extinct-blockchains-and-transactions-inside-of-them) or [Strongest vs Longest chain and orphaned blocks](https://bitcoin.stackexchange.com/q/29742/13866)
RedGrittyBrick
CC BY-SA 4.0
2018-11-07T15:09:18.373Z
You're right on track to describing what is called a "orphaned" block. Check the answers on [this](https://bitcoin.stackexchange.com/questions/5859/what-are-orphaned-and-stale-blocks) thread for some explanations and discussions about it.
Mason Ticehurst
CC BY-SA 4.0
2018-11-07T19:19:10.370Z
Also see: https://bitcoin.stackexchange.com/q/8172/5406, https://bitcoin.stackexchange.com/q/12427/5406
Murch
<blockchain>
How does the bitcoin network remove duplicate blocks being generated by multiple miners?
Mainak Sikdar
# How does the bitcoin network remove duplicate blocks being generated by multiple miners?

(Asked by: username_0 on 2018-11-07)

Say there are two minersA&B and each of them have produced the next block almost at the same instant. In this situation how is the network going to decide which one is the main block and abandon the other block?

Also, say if the txns contained by the first block are T1,T2,T3 while txns in the second block contains T2,T3,T4,what is going to happen to the uncommon transactions if either of the block get abandoned, i.e.T1or T4?

I am sure that from the txn pool, multiple miners would be picking up the same txns and start racing for the next block creation and insert that txn in the new block.

**Tags:** blockchain

> **Comments:**
> **username_1**: Possible duplicate of [What happens to extinct blockchains, and transactions inside of them?](https://bitcoin.stackexchange.com/questions/12462/what-happens-to-extinct-blockchains-and-transactions-inside-of-them) or [Strongest vs Longest chain and orphaned blocks](https://bitcoin.stackexchange.com/q/29742/13866)  
> **username_2**: You're right on track to describing what is called a "orphaned" block. Check the answers on [this](https://bitcoin.stackexchange.com/questions/5859/what-are-orphaned-and-stale-blocks) thread for some explanations and discussions about it.  
> **username_3**: Also see: https://bitcoin.stackexchange.com/q/8172/5406, https://bitcoin.stackexchange.com/q/12427/5406  

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