<p>No it's not, it must be a blockchain not a blockgraph, if two blocks share the same parent then only one of them can be in the chain, and because blocks can't be 'editted' without simply remining them, you have to choose either one chain or the other. Even if you could, do that, there's a host of other issues like the same coins being spent on both chains, or the block height in the coinbase being wrong</p>

CC BY-SA 3.0
2017-11-12T03:05:10.617Z
2017-11-12T03:05:10.617Z
meshcollider
<p>In bitcoin each block in the chain contains a reference to one single parent block (except the very first block which has no parent block) thus this is not possible as would require a reference to two parent blocks.</p>

CC BY-SA 3.0
2017-11-12T11:13:45.377Z
2017-11-12T11:13:45.377Z
croraf
<p>After a fork in a given chain, is it possible to merge the two chains back together so that they share the same blockchain? </p>

<blockchain><blockchain-fork>
Can separate Bitcoin chains be merged back?
Tabish Mir
# Can separate Bitcoin chains be merged back?

(Asked by: username_0 on 2017-11-12)

After a fork in a given chain, is it possible to merge the two chains back together so that they share the same blockchain?

**Tags:** blockchain, blockchain-fork


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## 2 answers

### Answer by username_1 on 2017-11-12. Score: 2

No it's not, it must be a blockchain not a blockgraph, if two blocks share the same parent then only one of them can be in the chain, and because blocks can't be 'editted' without simply remining them, you have to choose either one chain or the other. Even if you could, do that, there's a host of other issues like the same coins being spent on both chains, or the block height in the coinbase being wrong


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### Answer by username_2 on 2017-11-12. Score: 1

In bitcoin each block in the chain contains a reference to one single parent block (except the very first block which has no parent block) thus this is not possible as would require a reference to two parent blocks.


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