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Internet is not required [1] to sync a full Bitcoin node. There have also been numerous proof-of-concepts for transmitting Bitcoin transactions via radio.

[1] https://blockstream.com/satellite/

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Very nice initiative, but for first time users you still need to download 300GB+ of blockchain

https://aws.amazon.com/snowmobile/#:~:text=AWS%20Snowmobile%....

https://help.backblaze.com/hc/en-us/articles/217665948-Resto...

https://www.fastcompany.com/3048163/in-cuba-an-underground-n...

You never need to download 300gb, starting with 3gb snapshot is just as secure.

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