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As far I understand monero is now divided as monero and monero classic/original/0 . So which is the more reliable coin?

I do have a linux node in which an old version of monerod was installed. To what blockchain should I upgrade it to ?

From where can i download a fully synced blockchain of XMR?

Can you please explain in simple terms as iam a crypto newbie. Thanks in advance!

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An oversimplified explanation is as follows:

Bitmain, an ASIC manufacturer, created a Cryptonight ASIC. This enabled the company to "control" a large portion of the Monero hash rate and consequently mine many coins.

When The Monero Project learned about this, it modified the Cryptonight proof-of-work (PoW) so that any previously-created ASIC's would be rendered generally ineffective.

The PoW change was made effective as of the Spring 2018 Monero non-contentious network upgrade (which requires a hard fork), at block 1546000. The transaction version as of block 1546000 is v7. The Monero Project is currently developing on top of this (and its users are using it too, of course).

Bitmain didn't actually fork Monero. They simply neglected to update. They are using deprecated code and continuing to mine on an invalid fork. Granted, if enough people treat the fork as valid, then it becomes "valid" in that sense.

As far as I know, there is no development on the deprecated code. Perhaps if there was a legitimate reason to maintain the deprecated code, someone would have at least changed the network ID so that the two forks wouldn't confuse each other's nodes, which has happened. Since the deprecated code does not appear to have maintainers (and since the only apparent reason for that fork to exist is so a company can mine it more efficiently than anyone else), it may make sense to treat that fork as invalid.

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