diff --git a/dandischema/consts.py b/dandischema/consts.py
index 802cb9f7..e6b1c9ed 100644
--- a/dandischema/consts.py
+++ b/dandischema/consts.py
@@ -1,4 +1,4 @@
-DANDI_SCHEMA_VERSION = "0.6.5"
+DANDI_SCHEMA_VERSION = "0.7.0"
 ALLOWED_INPUT_SCHEMAS = [
     "0.4.4",
     "0.5.1",
@@ -8,6 +8,7 @@
     "0.6.2",
     "0.6.3",
     "0.6.4",
+    "0.6.5",
 ]
 
 # ATM we allow only for a single target version which is current
diff --git a/dandischema/metadata.py b/dandischema/metadata.py
index 21999eae..9a8df6ce 100644
--- a/dandischema/metadata.py
+++ b/dandischema/metadata.py
@@ -300,6 +300,18 @@ def migrate(
         if "schemaKey" not in obj:
             obj["schemaKey"] = "Dandiset"
         obj["schemaVersion"] = to_version
+    if version2tuple(schema_version) < version2tuple("0.7.0"):
+        if "blobDateModified" in obj:
+            obj["contentDateModified"] = obj.pop("blobDateModified")
+        # we need to deduce what type of content we have
+        obj["contentType"] = (
+            models.ContentType.Zarr
+            if (
+                obj.get("encodingFormat") == "application/x-zarr"
+                or obj.get("path", "").endswith(".zarr")
+            )
+            else models.ContentType.Blob
+        )
     return obj
 
 
diff --git a/dandischema/models.py b/dandischema/models.py
index 7633143b..ddf0cb56 100644
--- a/dandischema/models.py
+++ b/dandischema/models.py
@@ -77,6 +77,16 @@ class AccessType(Enum):
     """
 
 
+class ContentType(Enum):
+    """An enumeration of types of content asset can have"""
+
+    #: Asset contains a regular file - a data blob
+    Blob = "dandi:Blob"
+
+    #: Asset contains a zarr (currently a folder)
+    Zarr = "dandi:Zarr"
+
+
 class DigestType(Enum):
     """An enumeration of checksum types"""
 
@@ -1516,10 +1526,15 @@ class BareAsset(CommonModel):
         json_schema_extra={"nskey": "schema"},
         title="Asset (file or metadata) modification date and time",
     )
-    blobDateModified: Optional[datetime] = Field(
+    contentType: ContentType = Field(
+        None,
+        json_schema_extra={"nskey": "dandi"},
+        title="Type of the content asset contains.",
+    )
+    contentDateModified: Optional[datetime] = Field(
         None,
         json_schema_extra={"nskey": "dandi"},
-        title="Asset file modification date and time.",
+        title="Asset content modification date and time.",
     )
     # overload to restrict with max_items=1
     access: List[AccessRequirements] = Field(