diff --git a/packages/lexicon/schemas/item.json b/packages/lexicon/schemas/item.json
index 45b8129..ea057f9 100644
--- a/packages/lexicon/schemas/item.json
+++ b/packages/lexicon/schemas/item.json
@@ -1,26 +1,11 @@
 {
   "version": 1,
   "id": "app.cistern.lexicon.item",
-  "description": "An encrypted value meant to be accessed and deleted later.",
+  "description": "An encrypted memo intended to be accessed and deleted later.",
   "defs": {
-    "encryptedField": {
-      "type": "object",
-      "description": "An inline-encrypted property",
-      "required": ["value", "nonce"],
-      "properties": {
-        "value": {
-          "type": "string",
-          "description": "Encrypted field value"
-        },
-        "nonce": {
-          "type": "string",
-          "description": "Nonce used to encrypt field value"
-        }
-      }
-    },
     "main": {
       "type": "record",
-      "description": "A manifest representing an encrypted note or binary file",
+      "description": "An encrypted memo",
       "record": {
         "type": "object",
         "required": [
@@ -29,8 +14,9 @@
           "nonce",
           "algorithm",
           "pubkey",
-          "chunks",
-          "metadata"
+          "payload",
+          "contentLength",
+          "contentHash"
         ],
         "properties": {
           "tid": {
@@ -40,12 +26,13 @@
           }
           "ciphertext": {
             "type": "string",
-            "description": "Encapsulated shared ciphertext"
+            "description": "Encapsulated shared ciphertext",
+            "maxLength": 2000
           },
           "nonce": {
             "type": "string",
-            "description": "Nonce used for content encryption",
-            "maxLength": 64,
+            "description": "Base64-encoded nonce used for content encryption",
+            "maxLength": 32,
           },
           "algorithm": {
             "type": "string",
@@ -57,42 +44,17 @@
             "description": "URI to the public key used to encrypt this item",
             "format": "at-uri"
           },
-          "chunks": {
-            "type": "array",
-            "description": "Encrypted blobs that compose the encrypted contents of the item"
-            "items": {
-              "type": "blob",
-              "accept": "application/octet-stream",
-              "maxSize": 50000000
-            },
-            "minLength": 1
+          "payload": {
+            "type": "string",
+            "description": "Base64-encoded encrypted item contents"
           },
-          "metadata": {
-            "type": "object",
-            "description": "Information about the encrypted content.",
-            "required": ["format", "length", "hash"],
-            "properties": {
-              "format": {
-                "type": "string",
-                "description": "Original contents format",
-                "knownValues": ["text", "file"]
-              },
-              "length": {
-                "type": "ref",
-                "description": "Original content length in bytes",
-                "ref": "app.cistern.lexicon.item#encryptedField"
-              },
-              "hash": {
-                "type": "string",
-                "description": "SHA-256 hash of the original file",
-                "maxLength": 64,
-              },
-              "mimetype": {
-                "type": "ref",
-                "description": "Mimetype of original contents, if a file",
-                "ref": "app.cistern.lexicon.item#encryptedField"
-              }
-            }
+          "contentLength": {
+            "type": "integer",
+            "description": "Original content length in bytes",
+          },
+          "contentHash": {
+            "type": "string",
+            "description": "Base64-encoded hash of the decrypted contents. Verify this before accepting the decrypted message. The algorithm is identified under `algorithm`"
           }
         }
       }