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":"986d9be1be94e28ba231c53c7c97f617178d738dabb9b8a1feb3be5976022fe6","actionTitle":"FIFA 2026 ticket purchase · USA vs Brazil · Cat 1 · Verified Fan","actionType":"ticket_purchase","actorHandle":"demo","externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_thoKA_sSLU9R","signedAt":"2026-07-31 08:37:25"}
Action payload hash · SHA-256 of the canonical action payload
986d9be1be94e28ba231c53c7c97f617178d738dabb9b8a1feb3be5976022fe6
Server signature · HMAC-SHA256 over canonical JSON above
57f79b3827dbeeb40c6ff549080292def019a6f88558d4b836dea1be71838107
Recompute it yourself
$ printf '%s' '{"actionPayloadHash":"986d9be1be94e28ba231c53c7c97f617178d738dabb9b8a1feb3be5976022fe6","actionTitle":"FIFA 2026 ticket purchase · USA vs Brazil · Cat 1 · Verified Fan","actionType":"ticket_purchase","actorHandle":"demo","externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_thoKA_sSLU9R","signedAt":"2026-07-31 08:37:25"}' \
| openssl dgst -sha256 -hmac "$MANAV_SERVER_SIGNING_SECRET" -hex
$ # expected: 57f79b3827dbeeb40c6ff549080292def019a6f88558d4b836dea1be71838107