I am just wondering and struggling to understand how blockchain developers of crypto coins like BTC, ETH, etc. manage to update the code due to the consensus nature. Do they stop all nodes, so later on push the updated code and then run again and they sync to reach consensus again? if yes. How were forks prevented in that case? Or somehow they manage to update the source code without pull plug nodes but instead to have them running up and fully functional?
How do developers manage to update new source code on blockchain due to the difficulty of distributed and decentralized consensus process
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For forks, both soft and hard
The blockchain never stops. Neither Bitcoin nor Ethereum have paused of halted for many many years. Uptime is generally much better than on traditional IT systems due to distributed and censorship resistant nature.
Ethereum mainnet upgrade from proof-of-work to proof-of-stake was one of the most complex and most co-ordinated hard fork, and also software upgrade, ever performed in the terms of human work years involved.