The answer
Payjoin changes the usual input assumptions by involving the receiver in transaction construction. Privacy depends on implementations, coin selection and whether users accidentally combine unrelated UTXOs.
What to do next
Verify the proposed transaction with a wallet supporting Payjoin and review selected inputs before signing.
Sparrow Wallet — Bitcoin wallet software
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BitBox Bitcoin hardware wallet
A Bitcoin self-custody device to compare; it does not make on-chain transactions anonymous or prevent address linking.
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