Bitcoin security would not be irreparably degraded if hash power decreased over the long run. The worst consequence of a gradually lower hash power / market cap ratio: it may require recipients of very-high-value transactions to wait more blocks before relying on them.https://twitter.com/mhluongo/status/1092559882056802304 …
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I wish more people knew about the "just wait a few more blocks" response to the hash power attack scenario.
It would be good to get better numbers (preferably as computed advice from wallets) though.
