Explicador de erros de assinatura (Signature Error Explainer)
A verificação diz que a assinatura é inválida, mas você tem certeza de que está tudo certo? Cole a chave, a mensagem e a assinatura — o explicador testa cada interpretação comum até que uma delas passe na verificação e então mostra exatamente em qual suposição os dois lados discordam.
100% local — tudo roda no seu navegador, nada é enviado a nenhum servidor
How it works
Almost every "invalid signature" between two correct implementations is not broken cryptography — it is two sides silently assuming different conventions. The explainer builds a small grid of those conventions: candidate curves for your key, DER and raw signature readings (including swapped r/s), your message as literal text or hex/base64-decoded bytes, and the usual digests — SHA-256, SHA-384, SHA-512, legacy SHA-1, Bitcoin-style double SHA-256, plus the case where the message already is a digest. Each combination is actually verified with the audited @noble/curves library, in small batches so the page stays responsive. When one combination verifies, you get the exact mismatch and a code-level fix; when none does, you get an honest list of causes no tool can see from these three inputs. Everything runs inside your browser tab — the key, message and signature never leave your machine.