ES512
What this is
JWA names this ES512 but the NIST curve is P-521. The mismatch surprises people writing JWK crv values — use P-521. Rare. Prefer ES256 unless you have a P-521 requirement.
Open the decoder and paste a ES512 token. Verification stays in the browser.
FAQ
- crv in JWK?
- "crv":"P-521" not P-512. Wrong crv fails key import.