[Cryptography] Question about Bitcoin's security model

[John Levine]

It appears that jameslancasterliverpool via cryptography <jameslancasterliverpool at proton.me> said:
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>Hello,
>
>I have been studying the Bitcoin protocol and would like to ask a question.
>
>In your opinion, what is currently the biggest long-term security challenge for Bitcoin: quantum computing, mining centralization, or something else?

It's not technical.  It's opaque exchanges where most of the action happens.
That makes it really easy to manipulate the price with wash transactions.

R's,
John