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RE: Are trading contests worth taking part in?
it's gambling, that's why they call it whales :) but i'm sure the sharks will tell you it's because of the huge waves they make , heh ... maybe the benefit in contests like these is the data mined , not the bit of cash they spend (if at all due to the fees they take on every tx ... i doubt they will leave the fees for the duration of the contest - someone here mentioned fees already i see and yes indeed)
and then i wonder and always have
how is an 'offline wallet' tool keeping you safe if the data is inevitably linked 'IN'to the chain (or it wont be there) but i keep weird notions all the time :)
(dont wait up, im more than a month behind on replies, im sure ill get back to it someday)
Off-line is for security against key compromise against internet or on computer vectors. As for public transactions and how they remain private, this is done by not reusing addresses, which was implemented by BIP-0032 as Hierarchical Deterministic wallets which every modern crypto wallet that uses bitcoin-based cryptocurrencies should automatically default to.