diff --git a/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityAccess.java b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityAccess.java
index 7ad66d35..e12bee4b 100644
--- a/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityAccess.java
+++ b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityAccess.java
@@ -1,5 +1,10 @@
 package band.kessoku.lib.api.blockentity;
 
-public class BlockEntityAccess {
+import band.kessoku.lib.api.data.DataAccess;
+import band.kessoku.lib.api.data.DataStructure;
+import net.minecraft.block.entity.BlockEntity;
+
+@FunctionalInterface
+public interface BlockEntityAccess<T extends BlockEntity, S extends DataStructure> extends DataAccess<T, S> {
 
 }
diff --git a/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityCoordinator.java b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityCoordinator.java
new file mode 100644
index 00000000..6916a789
--- /dev/null
+++ b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/BlockEntityCoordinator.java
@@ -0,0 +1,11 @@
+package band.kessoku.lib.api.blockentity;
+
+import band.kessoku.lib.api.data.DataStructure;
+import net.minecraft.block.entity.BlockEntity;
+import net.minecraft.block.entity.BlockEntityType;
+
+public class BlockEntityCoordinator {
+    public static <T extends BlockEntity, S extends DataStructure> void add(BlockEntityType<T> type, BlockEntityAccess<T, S> access) {
+
+    }
+}
diff --git a/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/KessokuBlockEntity.java b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/KessokuBlockEntity.java
index 76b553bc..36dfc0fc 100644
--- a/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/KessokuBlockEntity.java
+++ b/blockentity/common/src/main/java/band/kessoku/lib/api/blockentity/KessokuBlockEntity.java
@@ -1,5 +1,8 @@
 package band.kessoku.lib.api.blockentity;
 
+import band.kessoku.lib.api.data.Storage;
+import band.kessoku.lib.impl.ItemSidinator;
+import net.minecraft.block.entity.BlockEntityType;
 import org.slf4j.Marker;
 import org.slf4j.MarkerFactory;
 
@@ -7,4 +10,13 @@ public class KessokuBlockEntity {
     public static final String MOD_ID = "kessoku_blockentity";
     public static final String NAME = "Kessoku Block Entity API";
     public static final Marker MARKER = MarkerFactory.getMarker("[" + NAME +"]");
+
+    public void init() {
+        BlockEntityCoordinator.add(BlockEntityType.FURNACE, Storage::inventory);
+        BlockEntityCoordinator.add(BlockEntityType.CHEST, Storage::inventory);
+        BlockEntityCoordinator.add(
+                BlockEntityType.FURNACE,
+                (blockentity) -> ItemSidinator.builder().side(1).bottom(2, 1).top(0).build()
+        );
+    }
 }
diff --git a/data/common/src/main/java/band/kessoku/lib/api/data/Sidinator.java b/data/common/src/main/java/band/kessoku/lib/api/data/Sidinator.java
new file mode 100644
index 00000000..5acea2ed
--- /dev/null
+++ b/data/common/src/main/java/band/kessoku/lib/api/data/Sidinator.java
@@ -0,0 +1,9 @@
+package band.kessoku.lib.api.data;
+
+import net.minecraft.util.math.Direction;
+
+import java.util.List;
+
+public interface Sidinator<S extends DataStructure> extends DataStructure {
+    List<Integer> get(Direction direction);
+}
diff --git a/data/common/src/main/java/band/kessoku/lib/api/data/Storage.java b/data/common/src/main/java/band/kessoku/lib/api/data/Storage.java
new file mode 100644
index 00000000..5f5df6a0
--- /dev/null
+++ b/data/common/src/main/java/band/kessoku/lib/api/data/Storage.java
@@ -0,0 +1,24 @@
+package band.kessoku.lib.api.data;
+
+import net.minecraft.inventory.Inventory;
+import net.minecraft.item.ItemStack;
+
+public interface Storage<T> extends DataStructure {
+    T get(int id);
+
+    int size();
+
+    static Storage<ItemStack> inventory(Inventory inventory) {
+        return new Storage<>() {
+            @Override
+            public ItemStack get(int id) {
+                return inventory.getStack(id);
+            }
+
+            @Override
+            public int size() {
+                return inventory.size();
+            }
+        };
+    }
+}
diff --git a/data/common/src/main/java/band/kessoku/lib/api/data/Timer.java b/data/common/src/main/java/band/kessoku/lib/api/data/Timer.java
new file mode 100644
index 00000000..36bac670
--- /dev/null
+++ b/data/common/src/main/java/band/kessoku/lib/api/data/Timer.java
@@ -0,0 +1,7 @@
+package band.kessoku.lib.api.data;
+
+public interface Timer extends DataStructure {
+    int time();
+
+    int totalTime();
+}
diff --git a/data/common/src/main/java/band/kessoku/lib/impl/ItemSidinator.java b/data/common/src/main/java/band/kessoku/lib/impl/ItemSidinator.java
new file mode 100644
index 00000000..b9f9de7d
--- /dev/null
+++ b/data/common/src/main/java/band/kessoku/lib/impl/ItemSidinator.java
@@ -0,0 +1,145 @@
+package band.kessoku.lib.impl;
+
+import band.kessoku.lib.api.data.Sidinator;
+import band.kessoku.lib.api.data.Storage;
+import com.mojang.serialization.Codec;
+import com.mojang.serialization.codecs.RecordCodecBuilder;
+import net.minecraft.item.ItemStack;
+import net.minecraft.network.RegistryByteBuf;
+import net.minecraft.network.codec.PacketCodec;
+import net.minecraft.util.math.Direction;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.function.BiConsumer;
+
+public class ItemSidinator implements Sidinator<Storage<ItemStack>> {
+    public static Codec<ItemSidinator> CODEC = RecordCodecBuilder.create(instance -> instance.group(
+            Codec.INT.listOf().fieldOf("down").forGetter((sidinator -> sidinator.get(Direction.DOWN))),
+            Codec.INT.listOf().fieldOf("up").forGetter((sidinator -> sidinator.get(Direction.UP))),
+            Codec.INT.listOf().fieldOf("north").forGetter((sidinator -> sidinator.get(Direction.NORTH))),
+            Codec.INT.listOf().fieldOf("south").forGetter((sidinator -> sidinator.get(Direction.SOUTH))),
+            Codec.INT.listOf().fieldOf("west").forGetter((sidinator -> sidinator.get(Direction.WEST))),
+            Codec.INT.listOf().fieldOf("east").forGetter((sidinator -> sidinator.get(Direction.EAST)))
+    ).apply(instance, ItemSidinator::new));
+    public static final PacketCodec<RegistryByteBuf, ItemSidinator> PACKET_CODEC = new PacketCodec<>() {
+        @Override
+        public ItemSidinator decode(RegistryByteBuf buf) {
+            ItemSidinator.Builder builder = ItemSidinator.builder();
+            for (Direction value : Direction.values()) {
+                int size = buf.readInt();
+                int[] ids = new int[size];
+                for (int i = 0; i < size; i++) {
+                    ids[i] = buf.readInt();
+                }
+                builder.add(value, ids);
+            }
+            return builder.build();
+        }
+
+        @Override
+        public void encode(RegistryByteBuf buf, ItemSidinator value) {
+            value.forEach((direction, ids) -> {
+                buf.writeInt(ids.size());
+                ids.forEach(buf::writeInt);
+            });
+        }
+    };
+
+
+    private final List<Integer> down;
+    private final List<Integer> up;
+    private final List<Integer> north;
+    private final List<Integer> south;
+    private final List<Integer> west;
+    private final List<Integer> east;
+
+    private ItemSidinator(
+            List<Integer> down,
+            List<Integer> up,
+            List<Integer> north,
+            List<Integer> south,
+            List<Integer> west,
+            List<Integer> east
+            ) {
+        this.down = down;
+        this.up = up;
+        this.north = north;
+        this.south = south;
+        this.west = west;
+        this.east = east;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    @Override
+    public List<Integer> get(Direction direction) {
+        return switch (direction) {
+            case DOWN -> down;
+            case UP -> up;
+            case NORTH -> north;
+            case SOUTH -> south;
+            case WEST -> west;
+            case EAST -> east;
+        };
+    }
+
+    public void forEach(BiConsumer<Direction, List<Integer>> biConsumer) {
+        for (Direction value : Direction.values()) {
+            biConsumer.accept(value, get(value));
+        }
+    }
+
+    public static class Builder {
+        private Builder() {}
+
+        private final List<Integer> down = new ArrayList<>();
+        private final List<Integer> up = new ArrayList<>();
+        private final List<Integer> north = new ArrayList<>();
+        private final List<Integer> south = new ArrayList<>();
+        private final List<Integer> west = new ArrayList<>();
+        private final List<Integer> east = new ArrayList<>();
+
+        public Builder side(int... values) {
+            return add(Direction.EAST, values).add(Direction.WEST, values).add(Direction.SOUTH, values).add(Direction.NORTH, values);
+        }
+
+        public Builder top(int... values) {
+            return add(Direction.UP, values);
+        }
+
+        public Builder bottom(int... values) {
+            return add(Direction.DOWN, values);
+        }
+
+        public Builder add(Direction direction, int... values) {
+            get(direction).addAll(Arrays.stream(values).boxed().toList());
+            return this;
+        }
+
+        private List<Integer> get(Direction direction) {
+            return switch (direction) {
+                case DOWN -> down;
+                case UP -> up;
+                case NORTH -> north;
+                case SOUTH -> south;
+                case WEST -> west;
+                case EAST -> east;
+            };
+        }
+
+        public ItemSidinator build() {
+            return new ItemSidinator(
+                    down.stream().distinct().toList(),
+                    up.stream().distinct().toList(),
+                    north.stream().distinct().toList(),
+                    south.stream().distinct().toList(),
+                    west.stream().distinct().toList(),
+                    east.stream().distinct().toList()
+            );
+        }
+    }
+}
diff --git a/data/common/src/main/java/band/kessoku/lib/impl/Progress.java b/data/common/src/main/java/band/kessoku/lib/impl/Progress.java
index feb32e57..2246464f 100644
--- a/data/common/src/main/java/band/kessoku/lib/impl/Progress.java
+++ b/data/common/src/main/java/band/kessoku/lib/impl/Progress.java
@@ -1,12 +1,12 @@
 package band.kessoku.lib.impl;
 
-import band.kessoku.lib.api.data.DataStructure;
+import band.kessoku.lib.api.data.Timer;
 import com.mojang.serialization.Codec;
 import com.mojang.serialization.codecs.RecordCodecBuilder;
 import net.minecraft.network.RegistryByteBuf;
 import net.minecraft.network.codec.PacketCodec;
 
-public class Progress implements DataStructure {
+public class Progress implements Timer {
     public static final Codec<Progress> CODEC = RecordCodecBuilder.create(instance -> instance.group(
             Codec.INT.fieldOf("time").forGetter(Progress::time),
             Codec.INT.fieldOf("totalTime").forGetter(Progress::totalTime)
@@ -30,11 +30,10 @@ public void encode(RegistryByteBuf buf, Progress value) {
     private Progress(int time, int totalTime) {
         this.time = time;
         this.totalTime = totalTime;
-
     }
 
-    public Progress(int totalTime) {
-        this.totalTime = totalTime;
+    public static Progress create(int totalTime) {
+        return new Progress(0, totalTime);
     }
 
     public void process() {