You have mixed security problems with privacy and scalability problems, and bitcoin security at the blockchain level is completely different from the level of individuals and wallets, so in short, bitcoin has not suffered from clear security problems since its inception in 2009 and since 2013 the network has been running 24/7 without the need for a hardfork. If you use good wallets, open source, true airgapped system then it can be said that your coins are safe.

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