Very nice flowchart. However that doesn't answer my question.
I think i explain it clear, but let me try again.. The question:
Quote
Is it possible to keep one chain prior the fork of bitcoin and bitcoin cash then two chains after the fork, one for each coin?
Yes is possible to have one chain before the fork, because there was only one coin. And yes, after the fork we have two chains, one for the old coin and other for the new coin. But the chains should look equal on the first blocks but they will look different after the fork. and you can see that on a block explorer:
Lets compare BTC with BCH
Block 1:
https://www.blockchain.com/btc/block/00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048
https://explorer.bitcoin.com/bch/block/00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048
Block #554384
https://www.blockchain.com/btc/block/0000000000000000001ab3d2bca70bcaa753681c86437c75a346ccdca542d632
https://bsvexplorer.io/block/000000000000000001c758c915d7e0efe33c99b247905f1ed5933c7bc49604c0
As you can see the first blocks was equal, and after the fork each chain get it's own way. Hope this answer your question.
