Secure yourself with 5 steps: 1. Use a modern HD wallet. Any current hardware or standard software wallet generates a fresh address per receive - that alone puts you in the safe column. 2. Never reuse an address you have spent from. Spending reveals the public key forever; anything left behind sits in the exposed pile. 3. If you hold coins on old or reused addresses, move them once to a freshly generated modern address. That single transaction takes them out of the harvest-now-decrypt-later pool
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