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I understand 12 word seeds mean there is 128 bits of 'security' but what does that mean? Would i need to worry about this being brute forced? If it was brute forced would having to scan the blockchain for every attempt not make that impossible/take forever? thanks guy

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See here for considerations on security.

Note that it is only partially true that brute forcing would involve having to scan the blockchain for every attempt. If you're doing a random search to find some random address with a balance then yes, you need to scan the blockchan for each to know whether you've hit the jackpot. If you're doing a targeted brute-force against a known address (or a list of them) then - no. This is because just rolling the seeds until the resulting address matches is enough. To actually see the balance, you'd still have to scan, though.

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