diff --git a/spec/README.md b/spec/README.md
index c7f83ca753..69c0f2fd5f 100644
--- a/spec/README.md
+++ b/spec/README.md
@@ -22,4 +22,5 @@ CodeChain is a programmable blockchain supporting multiple asset types. You can
   * [Merkle Trie](Merkle-Trie.md)
   * [Digital Signature](Digital-Signature.md)
 * [JSON RPC](JSON-RPC.md)
+* [Stratum](Stratum.md)
 
diff --git a/spec/Stratum.md b/spec/Stratum.md
new file mode 100644
index 0000000000..146d879f2f
--- /dev/null
+++ b/spec/Stratum.md
@@ -0,0 +1,144 @@
+Stratum is a light-weight mining protocol.
+
+# CLI options for Stratum
+
+ * `--no-stratum`
+   > Do not run stratum.
+ * `--stratum-port <PORT>`
+   > Listen for stratum connections on PORT. [default: 8008]
+
+# List of methods
+
+ * [mining.subscribe](#mining.subscribe)
+ * [mining.authorize](#mining.authorize)
+ * [mining.notify](#mining.notify)
+ * [mining.submit](#mining.submit)
+
+# Specification
+
+## mining.subscribe
+
+Used for subscribing mining jobs.
+
+Params: No parameters
+
+Return Type: No parameters
+
+Request Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 1,
+    "method": "mining.subscribe",
+    "params": []
+}
+```
+
+Response Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 1,
+    "result": [],
+    "error": null
+}
+```
+
+## mining.authorize
+
+Used for authorizing miners.
+
+Params:
+ 1. name: `string`
+ 2. password: `string`
+
+Return Type: `bool`
+
+Request Example
+```
+{
+    "jsonrpc": "2.0",
+    "id":2,
+    "method": "mining.authorize",
+    "params": ["miner1", "password"]
+}
+```
+
+Response Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 2,
+    "result": true,
+    "error": null
+}
+```
+
+## mining.notify
+
+Used for sending notifications regarding mining jobs.
+
+Params: `Work`
+
+Notification Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 3,
+    "method": "mining.notify",
+    "params": {
+        "0x56642f04d519ae3262c7ba6facf1c5b11450ebaeb7955337cfbc45420d573077",
+        "100"
+    },
+}
+```
+
+## mining.submit
+
+Used for submitting a proof-of-work solution.
+
+Params:
+ 1. powHash: `string`
+ 2. seal: `string[]`
+
+Return Type: `bool`
+
+Request Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 4,
+    "method": "mining.submit",
+    "params": ["0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef", ["0x56642f04d519ae3262c7ba6facf1c5b11450ebaeb7955337cfbc45420d573077"]],
+}
+```
+
+Response Example
+```
+{
+    "jsonrpc": "2.0",
+    "id": 4,
+    "result": true,
+    "error": null
+}
+```
+
+## Exception Handling (DRAFT)
+Stratum defines simple exception handling. Example of a rejected share looks like:
+```
+{
+    "jsonrpc": "2.0",
+    "id": 5,
+    "result": null,
+    "error": (21, "Job not found", null)
+}
+```
+
+Where the error field is defined as (error_code, human_readable_message, traceback). Traceback may contain additional information about debugging errors.
+Proposed error codes for mining services are:
+* 20 - Other/Unknown
+* 21 - Job not found (=stale)
+* 22 - Duplicate share
+* 23 - Low target share
+* 24 - Unauthorized worker
+* 25 - Not subscribed