What is Address Reuse?
Address reuse means accepting multiple transactions on the same address. It significantly hurts privacy by tying payments together and, in legacy script types, can weaken security after the public key is revealed. Best practice is one address per payment.
Why Address Reuse matters
Understanding Address Reuse is part of building a solid mental model of how Bitcoin, blockchain and Web3 systems actually work. Concepts in the Security category sit at the foundation of the broader stack — get them right and the rest is far easier.
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Reading the definition is a start. ZeroToBlock teaches concepts like Address Reuse through hands-on, browser-based simulations. Build the mental model by actually using it:
- Bitcoin 101 — interactive fundamentals course
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Related terms
- Address (Bitcoin / Crypto Address) — A public destination for receiving cryptocurrency.
- Wallet — Software or hardware that manages your private keys.
- UTXO (Unspent Transaction Output) — Bitcoin's accounting model: balances as a set of unspent outputs.
More security terms
- Seed Phrase — A human-readable backup of a wallet's private keys.
- 51% Attack — An attack where one party controls majority hash power.
- Cold Storage — Keeping private keys offline for security.
- Custody — Who controls the private keys.
- Slashing — Destroying part of a validator's stake as punishment.
- Multi-Signature (Multisig) — A wallet requiring multiple keys to spend.
- Hardware Wallet — A dedicated device that signs transactions offline.
- Hot Wallet — A wallet whose keys live on an internet-connected device.
Keep exploring
Continue with the full blockchain glossary — 136 terms in total — or read the developer blog and FAQ for deeper context.