Anonymous

Anonymous, in the context of cryptocurrency, describes the idea that a person's identity cannot be linked to their transactions or wallet holdings. In practice, most public blockchains fall short of that ideal: they are pseudonymous rather than truly anonymous, since every transfer is recorded permanently and openly under an address instead of a name.

On networks like Bitcoin, an address is only a string of characters, not a legal identity. But once that address is tied to a real person, through an exchange's KYC checks, an IP leak, or a payment for goods, the full transaction history behind it becomes traceable. Specialist blockchain-analysis firms build clustering software to make these links, and law enforcement and tax authorities increasingly rely on their reports.

This gap between apparent and actual privacy is what drove the development of privacy coins such as Monero and Zcash, which use techniques like ring signatures, stealth addresses, or zero-knowledge proofs descended from the early Zerocoin protocol to hide the sender, receiver, and amount by default. That extra opacity has made such coins a regulatory target: dozens of exchanges delisted Monero through 2024 and 2025 under anti-money-laundering pressure, and the EU's MiCA framework is phasing in restrictions on custodial privacy-coin services, though simply owning them remains legal in most jurisdictions.

The word also names Anonymous, the loosely organized international hacktivist collective known for its Guy Fawkes mask imagery. It has no formal leadership, coordinating instead through shared symbols and slogans, and has run campaigns for internet freedom and against censorship and government overreach since the mid-2000s.