diff --git a/package.json b/package.json
index 997adfa75..202594d8c 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "@cosmjs/stargate": "0.30.1",
     "@dotenvx/dotenvx": "^1.6.4",
     "@lit-protocol/accs-schemas": "^0.0.36",
-    "@lit-protocol/contracts": "^0.0.74",
+    "@lit-protocol/contracts": "0.0.74",
     "@lit-protocol/lit-status-sdk": "^0.1.8",
     "@metamask/eth-sig-util": "5.0.2",
     "@mysten/sui.js": "^0.37.1",
diff --git a/packages/constants/src/lib/constants/mappers.ts b/packages/constants/src/lib/constants/mappers.ts
index a55a729cc..731da57f8 100644
--- a/packages/constants/src/lib/constants/mappers.ts
+++ b/packages/constants/src/lib/constants/mappers.ts
@@ -1,9 +1,25 @@
 import depd from 'depd';
 
-import { datilDev, datilTest, datil } from '@lit-protocol/contracts';
-
 import { LIT_NETWORK_VALUES } from './constants';
 
+// Legacy root import that drags every network/ABI blob into bundles; keep commented as a warning.
+// import { datil, datilDev, datilTest } from '@lit-protocol/contracts';
+
+// @ts-ignore -- TypeScript can't resolve the subpath because this package compiles to CJS, but runtime bundlers can.
+import { datil as datilContext } from '@lit-protocol/contracts/prod/datil.js';
+// @ts-ignore -- see note above.
+import { datilDev as datilDevContext } from '@lit-protocol/contracts/prod/datil-dev.js';
+// @ts-ignore -- see note above.
+import { datilTest as datilTestContext } from '@lit-protocol/contracts/prod/datil-test.js';
+
+type DatilContext = typeof datilContext;
+type DatilDevContext = typeof datilDevContext;
+type DatilTestContext = typeof datilTestContext;
+
+const datil: DatilContext = datilContext;
+const datilDev: DatilDevContext = datilDevContext;
+const datilTest: DatilTestContext = datilTestContext;
+
 const deprecated = depd('lit-js-sdk:constants:mappers');
 
 /**
diff --git a/verify-contracts-bundle.sh b/verify-contracts-bundle.sh
new file mode 100755
index 000000000..57750b08f
--- /dev/null
+++ b/verify-contracts-bundle.sh
@@ -0,0 +1,150 @@
+#!/usr/bin/env bash
+
+# Quick sanity check for consumers of @lit-protocol/constants and contracts-sdk.
+# We spin up two tiny entry points, bundle them with esbuild, and dump which
+# @lit-protocol/contracts artifacts actually end up in the output. That makes it
+# easy to see whether only the intended network blobs are being shipped.
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT_DIR="$SCRIPT_DIR"
+BUNDLE_DIR="$ROOT_DIR/tmp/bundle-test"
+ESBUILD="$ROOT_DIR/node_modules/.bin/esbuild"
+
+if [[ ! -x "$ESBUILD" ]]; then
+  echo "esbuild not found at $ESBUILD; run yarn install first." >&2
+  exit 1
+fi
+
+mkdir -p "$BUNDLE_DIR"
+
+# Modules that are Node-only; when bundling for browsers we treat them as
+# externals so esbuild doesn't error on builtins like `crypto`.
+BROWSER_EXTERNALS=(
+  assert buffer child_process crypto fs http https module net os path stream
+  timers tls tty url util zlib
+)
+BROWSER_EXTERNAL_ARGS=()
+for mod in "${BROWSER_EXTERNALS[@]}"; do
+  BROWSER_EXTERNAL_ARGS+=(--external:"$mod")
+done
+
+# Generate the constants entry: loads NETWORK_CONTEXT_BY_NETWORK so the mapper
+# import path is exercised the same way a consuming app would.
+cat >"$BUNDLE_DIR/constants-entry.js" <<'JS'
+const { NETWORK_CONTEXT_BY_NETWORK } = require('@lit-protocol/constants');
+
+if (!NETWORK_CONTEXT_BY_NETWORK?.datil) {
+  throw new Error('datil context missing');
+}
+
+console.log('datil contracts count:', NETWORK_CONTEXT_BY_NETWORK.datil.data.length);
+JS
+
+# Generate the contracts SDK entry: touches LitContracts to mimic a typical SDK
+# consumer without pulling in unrelated code.
+cat >"$BUNDLE_DIR/contracts-sdk-entry.js" <<'JS'
+const { LitContracts } = require('@lit-protocol/contracts-sdk');
+
+if (typeof LitContracts !== 'function') {
+  throw new Error('LitContracts constructor not found');
+}
+
+console.log('LitContracts ready');
+JS
+
+# Bundle both entries for browser + node targets so we catch regressions in
+# either environment.
+echo "⭐️ [Browser] Bundling @lit-protocol/constants mapper..."
+"$ESBUILD" "$BUNDLE_DIR/constants-entry.js" \
+  --bundle \
+  --platform=browser \
+  --format=esm \
+  --outfile="$BUNDLE_DIR/constants-browser-bundle.js" \
+  --metafile="$BUNDLE_DIR/constants-browser-meta.json" \
+  "${BROWSER_EXTERNAL_ARGS[@]}" \
+  --log-level=info >/dev/null
+
+echo "⭐️ [CJS] Bundling @lit-protocol/constants mapper..."
+"$ESBUILD" "$BUNDLE_DIR/constants-entry.js" \
+  --bundle \
+  --platform=node \
+  --format=cjs \
+  --outfile="$BUNDLE_DIR/constants-node-bundle.cjs" \
+  --metafile="$BUNDLE_DIR/constants-node-meta.json" \
+  --log-level=info >/dev/null
+
+echo "⭐️ [Browser] Bundling @lit-protocol/contracts-sdk..."
+"$ESBUILD" "$BUNDLE_DIR/contracts-sdk-entry.js" \
+  --bundle \
+  --platform=browser \
+  --format=esm \
+  --outfile="$BUNDLE_DIR/contracts-sdk-browser-bundle.js" \
+  --metafile="$BUNDLE_DIR/contracts-sdk-browser-meta.json" \
+  "${BROWSER_EXTERNAL_ARGS[@]}" \
+  --log-level=info >/dev/null
+
+echo "⭐️ [CJS] Bundling @lit-protocol/contracts-sdk..."
+"$ESBUILD" "$BUNDLE_DIR/contracts-sdk-entry.js" \
+  --bundle \
+  --platform=node \
+  --format=cjs \
+  --outfile="$BUNDLE_DIR/contracts-sdk-node-bundle.cjs" \
+  --metafile="$BUNDLE_DIR/contracts-sdk-node-meta.json" \
+  --log-level=info >/dev/null
+
+# Pretty-print the relevant portion of esbuild's metafile so it's obvious which
+# contract blobs made it into the bundle and their combined size.
+summarise_meta () {
+  local label="$1"
+  local meta_path="$2"
+  local indent="${3:-}"
+  echo ""
+  echo "${indent}${label}"
+  echo "${indent}  (Every line below lists a bundled @lit-protocol/contracts file and its raw size)"
+  META_PATH="$meta_path" INDENT="$indent" node - <<'NODE'
+const path = require('path');
+const metaPath = process.env.META_PATH;
+const meta = require(metaPath);
+const indent = process.env.INDENT || '';
+const entries = Object.entries(meta.inputs)
+  .filter(([p]) => p.includes(path.join('@lit-protocol', 'contracts')));
+
+if (entries.length === 0) {
+  console.log(`${indent}  <no @lit-protocol/contracts files detected>`);
+  process.exit(0);
+}
+
+let total = 0;
+for (const [file, info] of entries) {
+  total += info.bytes;
+  console.log(`${indent}  ${file} -> ${(info.bytes / 1024).toFixed(2)} KiB`);
+}
+
+console.log(`${indent}  Total -> ${(total / 1024 / 1024).toFixed(3)} MiB`);
+NODE
+  echo "${indent}  (Total reflects the sum of those files before compression/minification)"
+}
+
+summarise_package () {
+  local package_label="$1"
+  local browser_meta="$2"
+  local node_meta="$3"
+
+  echo ""
+  echo "⭐️ ${package_label} bundles:"
+  summarise_meta "Browser includes:" "$browser_meta" "  "
+  summarise_meta "Node includes:" "$node_meta" "  "
+}
+
+summarise_package "@lit-protocol/constants" \
+  "$BUNDLE_DIR/constants-browser-meta.json" \
+  "$BUNDLE_DIR/constants-node-meta.json"
+
+summarise_package "@lit-protocol/contracts-sdk" \
+  "$BUNDLE_DIR/contracts-sdk-browser-meta.json" \
+  "$BUNDLE_DIR/contracts-sdk-node-meta.json"
+
+echo ""
+echo "Artifacts written to $BUNDLE_DIR"