diff --git a/extern/data b/extern/data
index 22f5b4da..da675047 160000
--- a/extern/data
+++ b/extern/data
@@ -1 +1 @@
-Subproject commit 22f5b4da12f67e57cf4d621997a6ec06954ca937
+Subproject commit da675047683dde5348ce2a1375ae1769e5a79643
diff --git a/include/gigamonkey/stratum/mining.hpp b/include/gigamonkey/stratum/mining.hpp
index f9d11f89..be3b8acb 100644
--- a/include/gigamonkey/stratum/mining.hpp
+++ b/include/gigamonkey/stratum/mining.hpp
@@ -11,7 +11,7 @@
 
 namespace Gigamonkey::Stratum {
     
-    using job_id = uint32;
+    using job_id = string;
     
     using worker_name = string;
     
diff --git a/include/gigamonkey/stratum/mining_notify.hpp b/include/gigamonkey/stratum/mining_notify.hpp
index 0425fe59..ff34de33 100644
--- a/include/gigamonkey/stratum/mining_notify.hpp
+++ b/include/gigamonkey/stratum/mining_notify.hpp
@@ -12,7 +12,8 @@
 namespace Gigamonkey::Stratum::mining {
     
     // Representation of a Stratum notify message. 
-    struct notify : notification { 
+    struct notify : notification {
+        
         struct parameters {
             job_id JobID;
             
diff --git a/include/gigamonkey/stratum/mining_submit.hpp b/include/gigamonkey/stratum/mining_submit.hpp
index f5973ddf..1df6f371 100644
--- a/include/gigamonkey/stratum/mining_submit.hpp
+++ b/include/gigamonkey/stratum/mining_submit.hpp
@@ -31,7 +31,7 @@ namespace Gigamonkey::Stratum::mining {
     inline submit_request::submit_request(message_id id, const share& x) : request{id, mining_submit, serialize(x)} {}
     
     bool inline submit_request::valid(const request& r) {
-        return deserialize(r).valid();
+        return r.valid() && deserialize(r.params()).valid();
     }
     
     bool inline submit_request::valid() const {
diff --git a/include/gigamonkey/stratum/mining_subscribe.hpp b/include/gigamonkey/stratum/mining_subscribe.hpp
index fb5b0dcc..0d939c16 100644
--- a/include/gigamonkey/stratum/mining_subscribe.hpp
+++ b/include/gigamonkey/stratum/mining_subscribe.hpp
@@ -11,10 +11,10 @@ namespace Gigamonkey::Stratum::mining {
     
     struct subscription {
         method Method;
-        session_id ID;
+        string ID;
         
         subscription() : Method{unset}, ID{} {}
-        subscription(method m, session_id id) : Method{m}, ID{id} {}
+        subscription(method m, string id) : Method{m}, ID{id} {}
         explicit subscription(const json&);
         explicit operator json() const;
         
diff --git a/include/gigamonkey/stratum/stratum.hpp b/include/gigamonkey/stratum/stratum.hpp
index 77c9db91..f1acf998 100644
--- a/include/gigamonkey/stratum/stratum.hpp
+++ b/include/gigamonkey/stratum/stratum.hpp
@@ -31,7 +31,7 @@ namespace Gigamonkey::Stratum {
         
         notification();
         notification(Stratum::method m, const parameters& p);
-        explicit notification(const json& j) : json{j} {}
+        explicit notification(const json& j) : json(j) {}
     };
     
     struct request : json {
@@ -50,7 +50,7 @@ namespace Gigamonkey::Stratum {
         
         request();
         request(message_id id, Stratum::method m, const parameters& p);
-        explicit request(const json& j) : json{j} {}
+        explicit request(const json& j) : json(j) {}
     };
     
     struct response : json {
@@ -72,7 +72,7 @@ namespace Gigamonkey::Stratum {
         response();
         response(message_id id, const json& p);
         response(message_id id, const json& p, const Stratum::error& e);
-        explicit response(const json& j) : json{j} {}
+        explicit response(const json& j) : json(j) {}
         
         bool is_error() const {
             return bool(error());
@@ -85,23 +85,23 @@ namespace Gigamonkey::Stratum {
     inline request::request(message_id id, Stratum::method m, const parameters& p) : 
         json{{"id", id}, {"method", method_to_string(m)}, {"params", p}} {}
     
-    inline bool request::valid(const json& j) {
+    bool inline request::valid(const json& j) {
         return request::method(j) != unset && j.contains("params") && j["params"].is_array() && j.contains("id") && message_id::valid(j["id"]);
     }
     
-    inline bool request::valid() const {
+    bool inline request::valid() const {
         return valid(*this);
     }
         
-    inline message_id request::id() const {
+    message_id inline request::id() const {
         return id(*this);
     }
     
-    inline Stratum::method request::method() const {
+    Stratum::method inline request::method() const {
         return method(*this);
     }
     
-    inline parameters request::params() const {
+    parameters inline request::params() const {
         return params(*this);
     }
     
@@ -110,19 +110,19 @@ namespace Gigamonkey::Stratum {
     inline notification::notification(Stratum::method m, const parameters& p) : 
         json{{"id", nullptr}, {"method"}, {"params", p}} {}
     
-    inline bool notification::valid(const json& j) {
+    bool inline notification::valid(const json& j) {
         return notification::method(j) != unset && j.contains("params") && j["params"].is_array() && j.contains("id") && j["id"].is_null();
     }
     
-    inline bool notification::valid() const {
+    bool inline notification::valid() const {
         return valid(*this);
     }
     
-    inline Stratum::method notification::method() const {
+    Stratum::method inline notification::method() const {
         return method(*this);
     }
     
-    inline parameters notification::params() const {
+    parameters inline notification::params() const {
         return params(*this);
     }
     
diff --git a/src/gigamonkey/stratum/mining.cpp b/src/gigamonkey/stratum/mining.cpp
index b9aaddc3..009fb25c 100644
--- a/src/gigamonkey/stratum/mining.cpp
+++ b/src/gigamonkey/stratum/mining.cpp
@@ -7,24 +7,16 @@ namespace Gigamonkey::Stratum::mining {
     
     namespace {
         
-        inline encoding::hex::fixed<4> write_job_id(const job_id& x) {
-            return encoding::hex::write(uint32_big{x}, encoding::hex::lower);
-        }
-        
         bool read_job_id(const json& j, job_id& x) {
             if (!j.is_string()) return false;
-            string str(j);
-            if (str.size() != 8) return false;
-            ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
-            uint32_big n;
-            std::copy(b->begin(), b->end(), n.begin());
-            x = uint32(n);
+            x = string(j);
             return true;
         }
         
-        inline encoding::hex::fixed<32> write(const uint256& x) {
-            return encoding::hex::write(x, encoding::hex::lower);
+        encoding::hex::fixed<32> inline write(const uint256& x) {
+            uint256 z = x;
+            for (int i = 0; i < 32; i+=4) std::reverse(z.begin() + i, z.begin() + i + 3);
+            return encoding::hex::write(z, encoding::hex::lower);
         }
         
         bool read(const json& j, uint256& x) {
@@ -32,12 +24,12 @@ namespace Gigamonkey::Stratum::mining {
             string str(j);
             if (str.size() != 64) return false;
             ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
-            std::copy(b->begin(), b->end(), x.begin());
+            if (b == nullptr) return false;
+            for (int i = 0; i < 8; i++) for (int j = 0; j < 4; j++) x[4 * i + j] = *(b->begin() + 4 * (i + 1) - j - 1);
             return true;
         }
         
-        inline encoding::hex::string write(const bytes& b) {
+        encoding::hex::string inline write(const bytes& b) {
             return encoding::hex::write(b, encoding::hex::lower);
         }
         
@@ -45,7 +37,7 @@ namespace Gigamonkey::Stratum::mining {
             if (!j.is_string()) return false;
             string str(j);
             ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
+            if (b == nullptr) return false;
             x = *b;
             return true;
         }
@@ -61,7 +53,7 @@ namespace Gigamonkey::Stratum::mining {
             return p;
         }
         
-        inline bool read(const json& j, Merkle::digests& x) {
+        bool inline read(const json& j, Merkle::digests& x) {
             if (!j.is_array()) return false;
             x = {};
             for (json d : j) {
@@ -72,7 +64,7 @@ namespace Gigamonkey::Stratum::mining {
             return true;
         }
         
-        inline encoding::hex::fixed<4> write(const int32_little& x) {
+        encoding::hex::fixed<4> inline write(const int32_little& x) {
             return encoding::hex::write(x, encoding::hex::lower);
         }
         
@@ -81,14 +73,14 @@ namespace Gigamonkey::Stratum::mining {
             string str(j);
             if (str.size() != 8) return false;
             ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
+            if (b == nullptr) return false;
             int32_big n;
             std::copy(b->begin(), b->end(), n.begin());
             x = int32_little(n);
             return true;
         }
         
-        inline encoding::hex::fixed<4> write(const work::compact& x) {
+        encoding::hex::fixed<4> inline write(const work::compact& x) {
             return encoding::hex::write(uint32_big{static_cast<uint32_little>(x)}, encoding::hex::lower);
         }
         
@@ -97,14 +89,14 @@ namespace Gigamonkey::Stratum::mining {
             string str(j);
             if (str.size() != 8) return false;
             ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
+            if (b == nullptr) return false;
             uint32_big n;
             std::copy(b->begin(), b->end(), n.begin());
             x = work::compact(uint32_little(n));
             return true;
         }
         
-        inline encoding::hex::fixed<4> write(const Bitcoin::timestamp& x) {
+        encoding::hex::fixed<4> inline write(const Bitcoin::timestamp& x) {
             return encoding::hex::write(uint32_big{x.Value}, encoding::hex::lower);
         }
         
@@ -113,18 +105,18 @@ namespace Gigamonkey::Stratum::mining {
             string str(j);
             if (str.size() != 8) return false;
             ptr<bytes> b = encoding::hex::read(str);
-            if (b != nullptr) return false;
+            if (b == nullptr) return false;
             uint32_big n;
             std::copy(b->begin(), b->end(), n.begin());
             x = Bitcoin::timestamp(uint32_little(n));
             return true;
         }
         
-        inline encoding::hex::fixed<8> write(const uint64_big& x) {
+        encoding::hex::fixed<8> inline write(const uint64_big& x) {
             return encoding::hex::write(x, encoding::hex::lower);
         }
         
-        inline bool read(const json& j, uint64_big& x) {
+        bool inline read(const json& j, uint64_big& x) {
             if (!j.is_string()) return false;
             string str(j);
             if (str.size() != 16) return false;
@@ -133,7 +125,7 @@ namespace Gigamonkey::Stratum::mining {
             return true;
         }
         
-        inline encoding::hex::fixed<4> write(const nonce& x) {
+        encoding::hex::fixed<4> inline write(const nonce& x) {
             return encoding::hex::write(uint32_big{x}, encoding::hex::lower);
         }
         
@@ -151,11 +143,12 @@ namespace Gigamonkey::Stratum::mining {
     }
     
     parameters notify::serialize(const parameters& p) {
-        return Stratum::parameters{write_job_id(p.JobID), write(p.Digest), write(p.GenerationTx1), write(p.GenerationTx2), 
+        return Stratum::parameters{p.JobID, write(p.Digest), write(p.GenerationTx1), write(p.GenerationTx2), 
                 write(p.Path), write(p.Version), write(p.Target), write(p.Now), p.Clean};
     }
     
     notify::parameters notify::deserialize(const Stratum::parameters& n) {
+        
         parameters p;
         
         if (n.size() != 9 || !n[8].is_boolean() ||
@@ -174,10 +167,10 @@ namespace Gigamonkey::Stratum::mining {
     }
         
     parameters submit_request::serialize(const share& Share) {
-        if (Share.Share.Bits) return parameters{Share.Name, write_job_id(Share.JobID), write(Share.Share.ExtraNonce2), 
+        if (Share.Share.Bits) return parameters{Share.Name, Share.JobID, write(Share.Share.ExtraNonce2), 
                 write(Share.Share.Timestamp), write(Share.Share.Nonce), write(*Share.Share.Bits)};
         
-        return parameters{Share.Name, write_job_id(Share.JobID), write(Share.Share.ExtraNonce2), 
+        return parameters{Share.Name, Share.JobID, write(Share.Share.ExtraNonce2), 
                 write(Share.Share.Timestamp), write(Share.Share.Nonce)};
     }
     
diff --git a/src/gigamonkey/stratum/mining_subscribe.cpp b/src/gigamonkey/stratum/mining_subscribe.cpp
index 67e04ab1..02bdec48 100644
--- a/src/gigamonkey/stratum/mining_subscribe.cpp
+++ b/src/gigamonkey/stratum/mining_subscribe.cpp
@@ -7,9 +7,7 @@ namespace Gigamonkey::Stratum::mining {
     
     subscription::subscription(const json& j) : subscription{} {
         if (!(j.is_array() && j.size() == 2 && j[0].is_string())) return;
-        auto id = session_id::deserialize(j[1]);
-        if (!id) return;
-        ID = *id;
+        ID = j[1];
         Method = method_from_string(j[0]);
     }
     
@@ -17,7 +15,7 @@ namespace Gigamonkey::Stratum::mining {
         parameters p;
         p.resize(2);
         p[0] = method_to_string(Method);
-        p[1] = session_id::serialize(ID);
+        p[1] = ID;
         return p;
     }
     
diff --git a/test/testStratum.cpp b/test/testStratum.cpp
index 6944df25..1fc092c1 100644
--- a/test/testStratum.cpp
+++ b/test/testStratum.cpp
@@ -35,6 +35,43 @@ namespace Gigamonkey::Stratum {
         EXPECT_EQ(id_b, *j_id_b);
     }
     
+    TEST(StratumTest, TestStratumPuzzle) {
+        
+        mining::subscribe_response subscribe_response{json::parse(
+            R"({"id": 1, "result": [ [ ["mining.set_difficulty", "b4b6693b72a50c7116db18d6497cac52"], ["mining.notify", "ae6812eb4cd7735a302a8a9dd95cf71f"]], "08000002", 4], "error": null})")};
+        
+        mining::subscribe_response::parameters srparams = subscribe_response.result();
+        
+        EXPECT_TRUE(subscribe_response.valid());
+        
+        mining::notify notify{json::parse(
+            R"({"params": 
+                ["bf", "4d16b6f85af6e2198f44ae2a6de67f78487ae5611b77c6c0440b921e00000000",
+                    "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff20020862062f503253482f04b8864e5008",
+                    "072f736c7573682f000000000100f2052a010000001976a914d23fcdf86f7e756a64a7a9688ef9903327048ed988ac00000000", 
+                    [], "00000002", "1c2ac4af", "504e86b9", false], 
+                "id": null, "method": "mining.notify"})")};
+        
+        EXPECT_TRUE(notify.valid());
+        
+        mining::submit_request submit_request{json::parse(
+            R"({"params": ["slush.miner1", "bf", "00000001", "504e86ed", "b2957c02"], 
+                "id": 4, "method": "mining.submit"})")};
+        
+        EXPECT_TRUE(submit_request.valid());
+        
+        digest256 expected_block_hash{"32abdc31d947623a2482144f92dbc092a84fd8ee6e2b5ae60f87762000000000"};
+        digest256 expected_prev_hash{"f8b6164d19e2f65a2aae448f787fe66d61e57a48c0c6771b1e920b4400000000"};
+        
+        proof p{worker{"Daniel", subscribe_response.result().ExtraNonce}, notify.params(), submit_request.params()};
+        
+        EXPECT_TRUE(p.valid());
+        work::string z = work::proof(p).string();
+        EXPECT_EQ(expected_block_hash, z.hash());
+        EXPECT_EQ(z.Digest, expected_prev_hash);
+        
+    }
+    
 }
 
 namespace Gigamonkey::Stratum::mining { 
@@ -124,8 +161,8 @@ namespace Gigamonkey::Stratum::mining {
         std::vector<request_test_case> request_test_cases{{23, {"dk", 2}}, {45, {"dk"}}};
         
         std::vector<response_test_case> response_test_cases {
-            {23, {{subscription{mining_set_difficulty, 1}, subscription{mining_notify, 2}}, {7, 8}}}, 
-            {45, {{subscription{mining_notify, 3}}, {30, 8}}}};
+            {23, {{subscription{mining_set_difficulty, "1"}, subscription{mining_notify, "2"}}, {7, 8}}}, 
+            {45, {{subscription{mining_notify, "3"}}, {30, 8}}}};
         
         for (const auto& i : request_test_cases) for (const auto& j : request_test_cases) {
             auto request_i = subscribe_request(i);
@@ -241,7 +278,7 @@ namespace Gigamonkey::Stratum::mining {
     }
     
     TEST(StratumTest, TestStratumProof) {
-        job_id jid = 2333;
+        job_id jid = "2333";
         extranonce en{1, 8};
         int32_little version = 2;
         Bitcoin::timestamp timestamp{3};