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Suppose I make a locked wallet with 50000 pre-generated addresses.

As long as I researched, only way I can collect those 50000 addresses using RPC and "getnewaddress". Feel free to correct me.

I understand this will took several hours or days, so I can set this up on some VPS and let it run.

For this I do not need blockchain to be synchronized.

How can I start bitcoind without blockchain synchronization?

I am thinking about "connect" option or testnet, but both looks like a hack.

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    You could also run dumpwallet, which would have the addresses in the resulting dump - although at this point, you might want to look into a small script to generate an HD wallet, it will likely go a lot faster. – Raghav Sood Jul 26 at 19:17
  • dumpwallet requires passphrase. – Nick Jul 26 at 20:02
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The recommended way is to use the -connect option. You can do -connect=0 or -noconnect (they mean the same thing) and Bitcoin Core will not try to automatically connect to any other node.

  • works like a charm. added connect=0 in the config file – Nick Jul 26 at 17:54

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