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Recommendations for how or where to buy Bitcoin are generally off-topic here, but long-term storage is a fair question.
First, understand what owning Bitcoin really boils down to: having knowledge of the private key that allows you to spend the Bitcoin stored at that key's address. You aren't storing the bitcoins themselves persay, you just need to store ...
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(This answer is a selection of quotes from an email I got from David Harding where he replied to my email reply to the newsletter. In the answer below, the quoted text is from my email question and the non-quoted text is from David Harding's reply)
I think it is indeed a collision attack.
The attack you describe is based on a database of preimages and
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Assuming you aren't too concerned about someone tracking the total amount of bitcoin you own, a paper wallet (potentially encrypted via BIP38) would be the safest bet. You only need to generate the key once and derived the address from it.
The key can then be stored somewhere very safe (there are a number of vault services, operated by banks and other ...
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The probability that 1 node is connected to another node will be 1 in 8, so if there were 10 million nodes, we can divide it in 8 block of nodes, every node will have access to one of the blocks.
The transaction takes less than 1 second to transfer from one node to the other, let suppose it takes 1 second, to make it easier.
On first second 8 nodes will be ...
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which, as I understand it, makes some data (until 2017?) real without verification.
You understand incorrectly. Firstly, the assumevalid blocks is updated at every major release, so it is at most a couple of months out of date for the most recent release. For Bitcoin Core 0.18.0, the assumevalid block is ...
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