Address reuse
Address reuse means receiving more than one payment at the same bitcoin address, which lets anyone who sees the address link those payments and follow the owner's history.
Every transaction is public. An address that receives many payments shows each payer the others, and spending from it links them together and to the change.
Wallets that follow BIP32 can create a fresh address for every payment at no cost. Since version 0.19.0.1, Bitcoin Core has offered an avoid_reuse option that controls whether coins on already used addresses are included in balances and payments.
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