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Worth considering also. You might say, since it's risky both ways, why not trust Coinbase? Aren't they more competent in security than me? Almost certainly, but this argument has two massive holes in it: (1) because they concentrate funds they are a massive target for hackers, while you are not - at all. (2) they are a trusted third party so the situation is strictly worse - not only do you have to trust their security skills, but you also have to trust...