diff --git a/client/packages/core/__tests__/src/instaml.test.js b/client/packages/core/__tests__/src/instaml.test.js
index 16b14e839..080cdc339 100644
--- a/client/packages/core/__tests__/src/instaml.test.js
+++ b/client/packages/core/__tests__/src/instaml.test.js
@@ -754,6 +754,7 @@ test("Schema: uses info in `attrs` and `links`", () => {
         cardinality: "one",
         "unique?": true,
         "index?": true,
+        "checked-data-type": "string",
         isUnsynced: true,
       },
     ],
@@ -893,6 +894,7 @@ test("Schema: lookup creates unique attrs for custom lookups", () => {
         "index?": true,
         isUnsynced: true,
         "unique?": true,
+        "checked-data-type": "string",
         "value-type": "blob",
       },
     ],
@@ -961,6 +963,7 @@ test("Schema: lookup creates unique attrs for lookups in link values", () => {
         cardinality: "one",
         "unique?": true,
         "index?": true,
+        "checked-data-type": "string",
         isUnsynced: true,
       },
     ],
@@ -1043,6 +1046,7 @@ test("Schema: lookup creates unique attrs for lookups in link values with arrays
         cardinality: "one",
         "unique?": true,
         "index?": true,
+        "checked-data-type": "string",
         isUnsynced: true,
       },
     ],
@@ -1233,3 +1237,140 @@ test("Schema: lookup creates unique ref attrs for ref lookup in link value", ()
     expect(result).toContainEqual(item);
   }
 });
+
+test("Schema: populates checked-data-type", () => {
+  const schema = i.graph(
+    {
+      comments: i.entity({
+        s: i.string(),
+        n: i.number(),
+        d: i.date(),
+        b: i.boolean(),
+        a: i.any(),
+        j: i.json(),
+      }),
+    },
+    {},
+  );
+
+  const commentId = uuid();
+  const ops = instatx.tx.comments[commentId].update({
+    s: "str",
+    n: "num",
+    d: "date",
+    b: "bool",
+    a: "any",
+    j: "json",
+  });
+
+  const result = instaml.transform(
+    {
+      attrs: zenecaAttrs,
+      schema: schema,
+    },
+    ops,
+  );
+
+  const expected = [
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "s"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+        "checked-data-type": "string",
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "n"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+        "checked-data-type": "number",
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "d"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+        "checked-data-type": "date",
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "b"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+        "checked-data-type": "boolean",
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "a"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "j"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": false,
+        "index?": false,
+        isUnsynced: true,
+      },
+    ],
+    [
+      "add-attr",
+      {
+        id: expect.any(String),
+        "forward-identity": [expect.any(String), "comments", "id"],
+        "value-type": "blob",
+        cardinality: "one",
+        "unique?": true,
+        "index?": false,
+        isUnsynced: true,
+      },
+    ],
+    ["add-triple", commentId, expect.any(String), commentId],
+    ["add-triple", commentId, expect.any(String), "str"],
+    ["add-triple", commentId, expect.any(String), "num"],
+    ["add-triple", commentId, expect.any(String), "date"],
+    ["add-triple", commentId, expect.any(String), "bool"],
+    ["add-triple", commentId, expect.any(String), "any"],
+    ["add-triple", commentId, expect.any(String), "json"],
+  ];
+
+  expect(result).toHaveLength(expected.length);
+  for (const item of expected) {
+    expect(result).toContainEqual(item);
+  }
+});
diff --git a/client/packages/core/src/instaml.js b/client/packages/core/src/instaml.js
index 8887b5a31..bc878f3e4 100644
--- a/client/packages/core/src/instaml.js
+++ b/client/packages/core/src/instaml.js
@@ -238,6 +238,8 @@ function toTxSteps(attrs, step) {
 // ---------
 // transform
 
+const CHECKED_DATA_TYPES = ["string", "date", "boolean", "number"];
+
 function objectPropsFromSchema(schema, etype, label) {
   const attr = schema.entities[etype]?.attrs?.[label];
   if (label === "id") return null;
@@ -245,9 +247,14 @@ function objectPropsFromSchema(schema, etype, label) {
     throw new Error(`${etype}.${label} does not exist in your schema`);
   }
   const { unique, indexed } = attr?.config;
+  const checkedDataType = CHECKED_DATA_TYPES.includes(attr?.valueType)
+    ? attr.valueType
+    : undefined;
+
   return {
     "index?": indexed,
     "unique?": unique,
+    "checked-data-type": checkedDataType,
   };
 }