diff --git a/src/IndexdedDB.js b/src/IndexdedDB.js
new file mode 100644
index 00000000..1c1250c5
--- /dev/null
+++ b/src/IndexdedDB.js
@@ -0,0 +1,215 @@
+
+DB = (function(){
+  class DBTransaction {
+    constructor (transaction) {
+      this.transaction = transaction;
+    }
+    setOperation (op) {
+      return new Promise((resolve, reject)=> {
+        var req = this.transaction.objectStore("OperationBuffer").put(op);
+        req.onsuccess = function (event) {
+          resolve(op);
+        };
+        req.onerror = function (event) {
+          reject("Could not set Operation!");
+        };
+      });
+    }
+    getOperation (uid) {
+      return new Promise((resolve, reject)=>{
+        var req = this.transaction.objectStore("OperationBuffer").get(uid);
+        req.onsuccess = function (event) {
+          resolve(req.result);
+        }
+        req.onerror = function (event) {
+          reject("Could not get Operation");
+        }
+      });
+    }
+    getOperations (state_map) {
+      var flow = Promise.resolve();
+      var ops = [];
+      var ob = that.transaction.objectStore("OperationBuffer");
+
+      this.getStateVector().then((end_state_vector)=>{
+         // convert to the db-structure
+        end_state_vector.forEach((end_state)=>{
+          var start_state = {
+            user: end_state.name,
+            state: state_map[end_state] || 0
+          }
+
+          flow = flow.then ()->
+            from = [start_state.user, start_state.number]
+            to = [end_state.user, end_state.number]
+            range = IDBKeyRange.bound from, to
+            defer = Promise.defer()
+
+            hb.openCursor(range).onsuccess = ()->
+              cursor = event.target.result
+              if cursor?
+                ops.push cursor.value # add Operation
+                cursor.continue()
+              else
+                # got all ops from this user
+                defer.resolve ops
+            defer.promise
+        })
+      })
+    }
+  }
+
+})()
+
+class DBTransaction
+
+  getOperations: (state_map)->
+    flow = Promise.resolve()
+    ops = []
+    that = this
+    hb = that.t.objectStore("OperationBuffer")
+
+    that.getStateVector().then (end_state_vector)->
+      for end_state of end_state_vector
+        # convert to the db-structure
+        do (end_state = end_state)->
+          start_state =
+            user: end_state.name
+            state: state_map[end_state] ? 0
+
+          flow = flow.then ()->
+            from = [start_state.user, start_state.number]
+            to = [end_state.user, end_state.number]
+            range = IDBKeyRange.bound from, to
+            defer = Promise.defer()
+
+            hb.openCursor(range).onsuccess = ()->
+              cursor = event.target.result
+              if cursor?
+                ops.push cursor.value # add Operation
+                cursor.continue()
+              else
+                # got all ops from this user
+                defer.resolve ops
+            defer.promise
+
+  setState: (state)->
+    that = this
+    new Promise (resolve, reject)->
+      req = that.t.objectStore("StateVector").put state
+      req.onsuccess = (event)->
+        resolve state
+      req.onerror = (event)->
+        reject "Could not set state vector!"
+
+  getState: (user)->
+    defer = Promise.defer()
+    req = @t.objectStore("StateVector").get user
+    req.onsuccess = (event)->
+      defer.resolve req.result
+    req.onerror = (event)->
+      defer.reject "Could not get state vector!"
+    defer.promise
+
+  getStateVector: ()->
+    defer = Promise.defer()
+    state_vector = []
+    @t.objectStore("StateVector").openCursor().onsuccess = ()->
+      cursor = event.target.result
+      if cursor?
+        state = cursor.value
+        state_vector.push state
+        cursor.continue()
+      else
+        # got all ops from this user
+        defer.resolve state_vector
+    defer.promise
+
+
+
+class Transaction
+  constructor: (@t)->
+
+  updateOperation: (op)->
+    @t.setOperation op
+
+  addOperation: (op)->
+    that = this
+    @t.getState op.uid[0]
+      .then (state)->
+        # only add operation if this is an expected operation
+        if not state?
+          state =
+            user: op.uid[0]
+            number: 0
+        if op.uid[1] is state.number
+          state.number++
+          that.t.setState state
+        else
+          return Promise.reject("Unexpected Operation")
+      .then that.t.setOperation op
+
+  getOperation: (uid)->
+    @t.getOperation uid
+
+  getState: (user)->
+    @t.getState user
+
+  getOperations: (state_vector)->
+    @t.getOperations state_vector
+
+
+class window.DB
+  constructor: ()->
+    @ready = (new Promise (resolve, reject)->
+      req = indexedDB.open "Testy", 7
+      req.onerror = ()->
+        reject "Couldn't open the IndexedDB database!"
+      req.onsuccess = (event)->
+        resolve event.target.result
+      req.onupgradeneeded = (event)->
+        db = event.target.result
+        objectStore = db.createObjectStore "OperationBuffer", {keyPath: "uid"}
+        objectStore = db.createObjectStore "StateVector", {keyPath: "user"}
+
+    ).catch (message)->
+      throw new Error message
+
+  requestTransaction: ()->
+    @ready.then (db)->
+      new Promise (resolve, reject)->
+        resolve new Transaction( new DBTransaction(db.transaction(["OperationBuffer", "StateVector"], "readwrite")) )
+
+  removeDatabase: ()->
+    req = indexedDB.deleteDatabase "Testy"
+    req.onsuccess = ()->
+      console.log("Deleted database successfully");
+    req.onblocked = ()->
+      console.log("Database is currently being blocked")
+      console.dir arguments
+    req.onerror = ()->
+      console.log("Couldn't delete database")
+      console.dir arguments
+    null
+
+window.db = new DB()
+
+window.addDummyDataSet = ()->
+  db.requestTransaction().then (t)->
+    t.getState("dmonad").then (state)->
+      state ?= {number: 0}
+      t.addOperation({uid: ["dmonad", state.number]})
+
+window.getOp = (num = 3)->
+  db.requestTransaction().then (t)->
+    t.getOperation(["dmonad", num])
+      .then (op)->
+        console.log("yay:")
+        console.log(op)
+
+window.getOps = (state_map = {dmonad: 5})->
+  db.requestTransaction().then (t)->
+    t.getOperations(state_map)
+      .then (op)->
+        console.log("yay:")
+        console.log(op)
diff --git a/src/IndexedDB.spec.js b/src/IndexedDB.spec.js
new file mode 100644
index 00000000..8b137891
--- /dev/null
+++ b/src/IndexedDB.spec.js
@@ -0,0 +1 @@
+