One in four bitcoin is quantum exposed because of address reuse. Learn why that's a problem, and how to fix (most) of it without rushing.

Last week Justin Drake's "bunker mode" post told big holders to move coins to addresses that have never signed anything. Whatever you think of his timeline, the advice is old: Satoshi told people to use addresses only once back in 2009, and the whitepaper says the same.

Tuesday we posted which wallets hold the biggest exposed keys (mostly exchange cold wallets). This is the follow-up for everyone else.

The new chapter covers:

• what a reused address gives away (your privacy, and a public key that stays visible for every coin still sitting there)
• why reuse still happens (donation pages, exchange deposit addresses, mining pools)
• the fixes: fresh addresses are free in any modern wallet, and silent payments, payment codes and Lightning handle the cases that need a fixed address
• what to do if you've already reused, without panicking

https://www.learnbitcoin.com/rabbit-hole/address-reuse

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