diff --git a/.config/cspell.json b/.config/cspell.json
index e555c6df3..e7a3b99e0 100644
--- a/.config/cspell.json
+++ b/.config/cspell.json
@@ -7,8 +7,11 @@
   "words": [
     "ACMRT",
     "Iseconds",
+    "merkletree",
     "nixbuild",
     "Oxlint",
+    "sideloaded",
+    "sideloading",
     "stefanzweifel",
     "tarides",
     "rimraf",
diff --git a/scripts/tests/check-cache-regressions.sh b/scripts/tests/check-cache-regressions.sh
index 3df59a75a..cdc90cca8 100755
--- a/scripts/tests/check-cache-regressions.sh
+++ b/scripts/tests/check-cache-regressions.sh
@@ -9,7 +9,7 @@ source ./scripts/lib/ux.sh
 ./run ./src/tests/cache/simple-regression.ts --bundle --mode check --tarball ./tests/test-artifacts/cache/simple-regression.tar.gz
 
 # This pin is generated in ./dump-cache-regressions.sh
-ARTIFACT_PIN=2025-10-14T13:40:45-04:00
+ARTIFACT_PIN=2025-10-14T13:59:51-04:00
 
 WORKDIR=tests/test-artifacts/cache/
 mkdir -p $WORKDIR
@@ -23,5 +23,6 @@ WORKDIR=tests/test-artifacts/cache/$ARTIFACT_PIN
 ./run ./src/tests/cache/simple-regression.ts --bundle --mode check --tarball $WORKDIR/simple-regression.tar.gz
 ./run ./src/tests/cache/complex-regression.ts --bundle --mode check --tarball $WORKDIR/complex-regression.tar.gz
 ./run ./src/tests/cache/rsa-regression.ts --bundle --keep --mode check --tarball $WORKDIR/rsa-regression.tar.gz
+./run ./src/tests/cache/sideloading-regression.ts --bundle --keep --mode check --tarball $WORKDIR/sideloading-regression.tar.gz
 
 echo "Artifacts checked successfully!"
\ No newline at end of file
diff --git a/scripts/tests/dump-cache-regressions.sh b/scripts/tests/dump-cache-regressions.sh
index adf108fcc..9bf848dd2 100755
--- a/scripts/tests/dump-cache-regressions.sh
+++ b/scripts/tests/dump-cache-regressions.sh
@@ -11,6 +11,7 @@ mkdir -p $WORKDIR
 ./run ./src/tests/cache/simple-regression.ts --bundle --mode dump --tarball $WORKDIR/simple-regression.tar.gz
 ./run ./src/tests/cache/complex-regression.ts --bundle --keep --mode dump --tarball $WORKDIR/complex-regression.tar.gz
 ./run ./src/tests/cache/rsa-regression.ts --bundle --keep --mode dump --tarball $WORKDIR/rsa-regression.tar.gz
+./run ./src/tests/cache/sideloading-regression.ts --bundle --keep --mode dump --tarball $WORKDIR/sideloading-regression.tar.gz
 
 gcloud storage cp --recursive $WORKDIR gs://o1js-ci/tests/cache/fixtures/
 
diff --git a/src/tests/cache/sideloading-regression.ts b/src/tests/cache/sideloading-regression.ts
new file mode 100644
index 000000000..2dd498d95
--- /dev/null
+++ b/src/tests/cache/sideloading-regression.ts
@@ -0,0 +1,67 @@
+import minimist from 'minimist';
+import assert from 'node:assert';
+import { Field, MerkleTree } from 'o1js';
+import {
+  MainProgramState,
+  MerkleTreeWitness,
+  SideloadedProgramProof,
+  mainProgram,
+  sideloadedProgram,
+} from '../../examples/zkprogram/side-loading/dynamic-keys-merkletree.js';
+import { CacheHarness } from './harness.js';
+
+const { mode, tarball } = minimist(process.argv.slice(2));
+
+const harness = await CacheHarness({ mode, tarball });
+
+const { verificationKey: sideVk } = await sideloadedProgram.compile({ cache: harness.cache });
+harness.check(sideVk, 'sideVk');
+
+const { verificationKey: mainVk } = await mainProgram.compile({ cache: harness.cache });
+harness.check(mainVk, 'mainVk');
+
+const tree = new MerkleTree(64);
+const rootBefore = tree.getRoot();
+tree.setLeaf(1n, sideVk.hash);
+const witness = new MerkleTreeWitness(tree.getWitness(1n));
+
+// verifying adding a sideloaded program
+{
+  const { proof } = await mainProgram.addSideloadedProgram(
+    new MainProgramState({
+      treeRoot: rootBefore,
+      state: Field(0),
+    }),
+    sideVk,
+    witness
+  );
+  const ok = await harness.verify(proof, 'mainVk');
+  assert.equal(ok, true, 'adding a sideloaded program should verify');
+
+  {
+    const { proof: childProof } = await sideloadedProgram.compute(Field(0), Field(10));
+    const { proof: validationProof } = await mainProgram.validateUsingTree(
+      proof.publicOutput,
+      proof,
+      sideVk,
+      witness,
+      SideloadedProgramProof.fromProof(childProof)
+    );
+    const ok = await harness.verify(validationProof, 'mainVk');
+    assert.equal(ok, true, 'validation using tree should work');
+  }
+  {
+    const { proof: childProof } = await sideloadedProgram.assertAndAdd(Field(0), Field(10));
+    const { proof: validationProof } = await mainProgram.validateUsingTree(
+      proof.publicOutput,
+      proof,
+      sideVk,
+      witness,
+      SideloadedProgramProof.fromProof(childProof)
+    );
+    const ok = await harness.verify(validationProof, 'mainVk');
+    assert.equal(ok, true, 'validation on assert and add should work');
+  }
+}
+
+await harness.finish();