Nanostack — Signature Verifier

HMAC-SHA512 Signature Verifier

Recomputes the signature over requestId + timestamp + body and compares it against the received value.

Key — base64-encoded HMAC secret

Received Signature — base64

Request ID — x-pxp-requestid header

Signature Timestamp — header

Body — raw webhook payload

Signed data preview

Expected SHA-512 · hex

Received SHA-512 · hex