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I started learning bitcoin and found this wiki: https://learnmeabitcoin.com/beginners/network

And there is this statement:

When you run the client it will connect to other nodes and start downloading a full copy of the blockchain (the file that contains all the verified transactions). After that, your client will start receiving transactions from other nodes and relaying them around the network.

Is it really true that each bitcoin client downloads the full transaction history? Unsure if that scales...

And if someone could provide a good official doc about explaining how bitcoin works?

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