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":"df35ad7ca821eb5cd2d027b28cbc88c50a74dbec61ece7aeff6c81816e1ba510","actionTitle":"MSA: Acme AI Labs ↔ GreenLeaf Designs LLC","actionType":"contract_sign","actorHandle":"arivu13_f2d1e0","externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_UAtPMl0KBaPs","signedAt":"2026-06-02 08:05:02"}
Action payload hash · SHA-256 of the canonical action payload
df35ad7ca821eb5cd2d027b28cbc88c50a74dbec61ece7aeff6c81816e1ba510
Server signature · HMAC-SHA256 over canonical JSON above
0486242b31c5435188111882ff54d917176b1273aa6696eac76f9fadfa4c4908
Recompute it yourself
$ printf '%s' '{"actionPayloadHash":"df35ad7ca821eb5cd2d027b28cbc88c50a74dbec61ece7aeff6c81816e1ba510","actionTitle":"MSA: Acme AI Labs ↔ GreenLeaf Designs LLC","actionType":"contract_sign","actorHandle":"arivu13_f2d1e0","externalReference":null,"organizationSlug":null,"signatureSlug":"mnav_sig_UAtPMl0KBaPs","signedAt":"2026-06-02 08:05:02"}' \
| openssl dgst -sha256 -hmac "$MANAV_SERVER_SIGNING_SECRET" -hex
$ # expected: 0486242b31c5435188111882ff54d917176b1273aa6696eac76f9fadfa4c4908