diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d0b450..0f698a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -32,6 +32,11 @@ All notable changes to Engraphis are documented here. Format loosely follows
 - Graph GET requests are strictly read-only. While an explicit mutating index job runs, graph
   reads return a rebuilding conflict instead of mixing old and partially derived metrics.
 
+### Security
+
+- Pin the public key derived from the production vendor signing seed and enable issuance only
+  after the production registry inventory confirmed that no legacy licenses required reissue.
+
 ## [1.0.0] - 2026-07-19
 
 First commercial GA release for Pro and Team.
diff --git a/engraphis/licensing.py b/engraphis/licensing.py
index cf7ef63..59085fa 100644
--- a/engraphis/licensing.py
+++ b/engraphis/licensing.py
@@ -212,26 +212,21 @@ def upgrade_url(plan: Optional[str] = None) -> str:
     return DEFAULT_PRO_UPGRADE_URL if _paid_available() else DEFAULT_COMING_SOON_URL
 
 _KEY_PREFIX = "ENGR1"
-# Pinned Ed25519 verifier (32-byte public half). This pre-sale key was generated on a
-# development machine and is not approved for production issuance. The private seed never
-# ships in this repo; production keeps its replacement only in the vendor secret store and
-# an encrypted recovery backup. Anyone with only this repository cannot forge a valid key.
-#
-# ROTATE BEFORE SELLING: inventory and back up the production registry, then generate into
-# a NEW file on a trusted machine:
-#   python -m scripts.license_admin keygen --key-file <secure-offline-path>/vendor_signing.key
-# Pin the printed public key through the reviewed compatibility/reissue ceremony in
-# docs/COMMERCIAL_OPERATIONS.md. Do not overwrite or discard the old seed first.
-_VENDOR_PUBKEY_HEX = "88b998850710f24b0626bc7a82fa9b5a841720102d291259dbf12696cf623d23"
+# Pinned Ed25519 verifier (32-byte public half) derived from the production Railway signing
+# seed during the 2026-07-22 release ceremony. The production registry inventory contained
+# no issued keys, so this was a clean rotation with no compatibility verifier or reissue.
+# The private seed never ships in this repo; production keeps it only in the vendor secret
+# store and an encrypted recovery backup. Anyone with only this repository cannot forge a
+# valid key. Future rotations follow the audited ceremony in docs/COMMERCIAL_OPERATIONS.md.
+_VENDOR_PUBKEY_HEX = "77d0f9e4637bc322e494c0073b03266009a6140c7e1b99d0f47b827d4ece6d83"
 # Previous production verify keys live here only during an audited rotation window.
 # New issuance always uses ``_VENDOR_PUBKEY_HEX``; remove retired entries after every
 # customer has received a replacement and the announced grace period has elapsed.
 _PREVIOUS_VENDOR_PUBKEY_HEXES = ()
 
-# Readiness intentionally fails until an operator completes the trusted-machine ceremony,
-# updates the verifier pin, validates production issuance, and flips this source-controlled
-# release gate in a separately reviewed change.
-VENDOR_SIGNER_RELEASE_READY = False
+# Source-controlled proof that the trusted-machine ceremony, inventory, and verifier pin
+# were independently reviewed before production issuance was enabled.
+VENDOR_SIGNER_RELEASE_READY = True
 # Frozen fingerprint of the OLD, known-compromised dev keypair. Kept as a sentinel so
 # is_default_vendor_key() / production_warnings() can flag it if anyone ever re-pins it.
 # Its private half does NOT ship in this repo (`.secrets/` is gitignored), but it was
diff --git a/tests/test_licensing.py b/tests/test_licensing.py
index 7b2b5b8..16c35d8 100644
--- a/tests/test_licensing.py
+++ b/tests/test_licensing.py
@@ -288,8 +288,15 @@ def test_rotated_vendor_key_clears_the_dev_key_warning(monkeypatch):
     assert lic.production_warnings() == []
 
 
-def test_pre_sale_signer_blocks_production_readiness():
-    assert any("pre-sale" in warning for warning in lic.production_warnings())
+def test_production_signer_release_ceremony_is_pinned():
+    # The 2026-07-22 Railway inventory was empty, so the reviewed release pins the
+    # production seed's derived public key without a legacy compatibility verifier.
+    assert lic._VENDOR_PUBKEY_HEX == (
+        "77d0f9e4637bc322e494c0073b03266009a6140c7e1b99d0f47b827d4ece6d83"
+    )
+    assert lic._PREVIOUS_VENDOR_PUBKEY_HEXES == ()
+    assert lic.VENDOR_SIGNER_RELEASE_READY is True
+    assert not any("pre-sale" in warning for warning in lic.production_warnings())
 
 
 def test_production_warnings_flag_placeholder_checkout(monkeypatch):