Can a Bitcoin wallet know whether its public key has already appeared on-chain?

Wallet software or analysis tools can examine output types and prior spends, but the result depends on correctly tracing the controlling key and script.

The answer

Wallet software or analysis tools can examine output types and prior spends, but the result depends on correctly tracing the controlling key and script.

What to do next

Use a reputable read-only tool; never submit recovery secrets to a risk checker.

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Mempool.space Bitcoin explorer

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Trezor hardware wallet

A current-generation hardware wallet for managing keys; it does not make Bitcoin or Ethereum quantum-resistant or resolve a future protocol migration.

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