diff --git a/build/builtin-actors/fetch-bundles.sh b/build/builtin-actors/fetch-bundles.sh
new file mode 100755
index 000000000..2b3c9704b
--- /dev/null
+++ b/build/builtin-actors/fetch-bundles.sh
@@ -0,0 +1,54 @@
+#!/bin/bash
+set -e
+
+cd $(dirname "$0")
+
+actors7_cid=""
+actors7_hash=""
+actors8_cid="bafybeictmywrut5tprz5fnoti6adfwuvixvrfardhqwldxosmdsfavc56e"
+actors8_hash="687b38f59b0c32800f55a8f1f303de214ec173c90e653984d67f393bc41c1416"
+
+die() {
+    echo "$1"
+    exit 1
+}
+
+check() {
+    file=$1
+    hash=$2
+    if [ -e "$file" ]; then
+        file_hash=$(sha256sum "$file" | cut -d ' ' -f 1)
+        if [ "$file_hash" == "$hash" ]; then
+            return 0
+        else
+            return 1
+        fi
+    else
+        return 1
+    fi
+}
+
+fetch() {
+    output=$1
+    cid=$2
+    hash=$3
+    if (check $output $hash); then
+        return 0
+    else
+        echo "fetching $cid to $output"
+        curl -k "https://dweb.link/ipfs/$cid" -o $output
+        check $output $hash || die "hash mismatch"
+    fi
+}
+
+if [ ! -z "$actors7_cid" ]; then
+    fetch builtin-actors-v7.car "$actors7_cid" "$actors7_hash"
+else
+    touch builtin-actors-v7.car
+fi
+
+if [ ! -z "$actors8_cid" ]; then
+    fetch builtin-actors-v8.car "$actors8_cid" "$actors8_hash"
+else
+    touch builtin-actors-v8.car
+fi