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Paste the 12-word seed from your production Twetch account. It is derived and signed in this browser. The words are never sent to this issuer.
Sign externally — seed never touches this site
Get a challenge, sign it on your own machine with any Bitcoin Signed Message tool, and paste the result. Nothing secret ever enters this page.
Challenge will appear here.
Offline signer: node examples/sign-challenge.mjs "<message>" "twelve words…" (repo local, auditable).