diff --git a/.gitea/workflows/check.yml b/.gitea/workflows/check.yml
index d14b66e..7266ab7 100644
--- a/.gitea/workflows/check.yml
+++ b/.gitea/workflows/check.yml
@@ -17,3 +17,5 @@ jobs:
         run: |
           cd backend/secretapi
           go test ./...
+      - name: Validate deployment artifacts
+        run: ./scripts/check_deployment_artifacts.sh
diff --git a/README.md b/README.md
index 98c4813..1f52051 100644
--- a/README.md
+++ b/README.md
@@ -106,6 +106,7 @@ README.md
 ## Scripts
 
 1. `scripts/publish_split_repos.sh` - creates/pushes `launcher`, `governance`, `contracts` repos using either a provided Gitea PAT or git credential-helper auth for `git.edut.dev`.
+2. `scripts/check_deployment_artifacts.sh` - validates `docs/deployment/contract-addresses.base-sepolia.json` format and fail-closed parity assumptions.
 
 ## Internationalization
 
diff --git a/scripts/check_deployment_artifacts.sh b/scripts/check_deployment_artifacts.sh
new file mode 100755
index 0000000..7a2f072
--- /dev/null
+++ b/scripts/check_deployment_artifacts.sh
@@ -0,0 +1,81 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+FILE="$ROOT_DIR/docs/deployment/contract-addresses.base-sepolia.json"
+
+if ! command -v jq >/dev/null 2>&1; then
+  echo "FAIL: jq is required"
+  exit 1
+fi
+
+if [[ ! -f "$FILE" ]]; then
+  echo "FAIL: missing deployment artifact: $FILE"
+  exit 1
+fi
+
+check_eth_address() {
+  local value="$1"
+  if [[ ! "$value" =~ ^0x[0-9a-fA-F]{40}$ ]]; then
+    return 1
+  fi
+  return 0
+}
+
+to_lower() {
+  printf "%s" "$1" | tr '[:upper:]' '[:lower:]'
+}
+
+network="$(jq -r '.network // ""' "$FILE")"
+chain_id="$(jq -r '.chain_id // 0' "$FILE")"
+membership_contract="$(jq -r '.membership_contract // ""' "$FILE")"
+entitlement_contract="$(jq -r '.entitlement_contract // ""' "$FILE")"
+offer_registry_contract="$(jq -r '.offer_registry_contract // ""' "$FILE")"
+treasury_wallet="$(jq -r '.treasury_wallet // ""' "$FILE")"
+mint_currency_mode="$(jq -r '.mint_currency_mode // ""' "$FILE")"
+mint_amount_atomic="$(jq -r '.mint_amount_atomic // ""' "$FILE")"
+version="$(jq -r '.version // ""' "$FILE")"
+
+if [[ "$network" != "base-sepolia" ]]; then
+  echo "FAIL: unexpected network: $network"
+  exit 1
+fi
+if [[ "$chain_id" != "84532" ]]; then
+  echo "FAIL: unexpected chain_id: $chain_id"
+  exit 1
+fi
+
+for addr_name in membership_contract entitlement_contract offer_registry_contract treasury_wallet; do
+  value="$(jq -r ".${addr_name} // \"\"" "$FILE")"
+  if ! check_eth_address "$value"; then
+    echo "FAIL: invalid address for ${addr_name}: ${value}"
+    exit 1
+  fi
+done
+
+if [[ "$(to_lower "$entitlement_contract")" != "$(to_lower "$offer_registry_contract")" ]]; then
+  echo "FAIL: entitlement_contract and offer_registry_contract diverged"
+  exit 1
+fi
+
+if [[ "$mint_currency_mode" != "ETH_TEST" && "$mint_currency_mode" != "USDC" ]]; then
+  echo "FAIL: invalid mint_currency_mode: $mint_currency_mode"
+  exit 1
+fi
+
+if [[ ! "$mint_amount_atomic" =~ ^[0-9]+$ ]]; then
+  echo "FAIL: invalid mint_amount_atomic: $mint_amount_atomic"
+  exit 1
+fi
+
+if [[ "$version" != "v1" ]]; then
+  echo "FAIL: unexpected deployment artifact version: $version"
+  exit 1
+fi
+
+echo "PASS: deployment artifact checks"
+echo "  network=$network chain_id=$chain_id"
+echo "  membership_contract=$membership_contract"
+echo "  entitlement_contract=$entitlement_contract"
+echo "  treasury_wallet=$treasury_wallet"
+echo "  mint_currency_mode=$mint_currency_mode mint_amount_atomic=$mint_amount_atomic"