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I was a backend database developer for a lot of years and so when I heard of bitcoin I thought, "There's no possible way to make data immutable" - that kept me from buying it for a very long time. In an alternate reality where I'm more humble I'm writing this reply on a yacht. :)
Especially the concept of no one controls it. This was hard to accept too
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Lol! It almost seemed too good to be true
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