Transactions & fees

Bitcoin Message Sign & Verify

Understand the difference between message signing and transaction authorization.

Runs locally

Security & privacy. Sensitive inputs and calculations stay on your device. No secrets are sent to the backend or saved in browser storage. Clear the form and result when finished. These key tools have not received an independent security audit; do not use it with real funds.

Use this tool

Runs on your device. No wallet secrets are sent to the server. These key tools have not received an independent audit; do not use with real funds.

Legacy Bitcoin signed messages for P2PKH only. This does not sign a payment or prove a person's identity.

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What this tool is for

A message signature can demonstrate control under a supported signing scheme. It does not establish a person’s identity or authorize a payment; address-type and scheme compatibility must be explicit.

Supported behavior

Legacy Bitcoin signed messages for P2PKH only. This does not sign a payment or prove a person's identity.

Security & privacy

Sensitive inputs and calculations stay on your device. No secrets are sent to the backend or saved in browser storage. Clear the form and result when finished. These key tools have not received an independent security audit; do not use it with real funds.