Manav signed the canonical JSON below with its server secret. Hash the JSON with HMAC-SHA256 using the MANAV_SERVER_SIGNING_SECRET and compare - if it matches, this proof is authentic.
Canonical proof JSON
{"actionPayloadHash":"fa357fa589f8cab64f9feafac842552ecd8560c7ff27fb015559ec35a44ee98c","actionTitle":"Promote @opsbot to Workspace Owner · acme-ai-labs.slack.com","actionType":"admin_promote","actorHandle":null,"externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_nCYUdr-bxGhI","signedAt":"2026-06-02 12:45:31"}
Action payload hash · SHA-256 of the canonical action payload
fa357fa589f8cab64f9feafac842552ecd8560c7ff27fb015559ec35a44ee98c
Server signature · HMAC-SHA256 over canonical JSON above
568468b52ce6c79c7047a43047c3a29cb76a7b1dd0c33240ae831d61c52dbdac
Recompute it yourself
$ printf '%s' '{"actionPayloadHash":"fa357fa589f8cab64f9feafac842552ecd8560c7ff27fb015559ec35a44ee98c","actionTitle":"Promote @opsbot to Workspace Owner · acme-ai-labs.slack.com","actionType":"admin_promote","actorHandle":null,"externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_nCYUdr-bxGhI","signedAt":"2026-06-02 12:45:31"}' \
| openssl dgst -sha256 -hmac "$MANAV_SERVER_SIGNING_SECRET" -hex
$ # expected: 568468b52ce6c79c7047a43047c3a29cb76a7b1dd0c33240ae831d61c52dbdac