minecraft_protocol/versions/1.8.md

# 1.8.x — The Bountiful Update

**Protocol:** 47  
**Versions:** 1.8 (2014-09-02) through 1.8.9 (2015-12-09) — all share the same protocol number  
**Minecraft wiki release article:** <https://minecraft.wiki/w/Java_Edition_1.8> (fetched 2026-06-19)  
**minecraft-data sources:** `/tmp/mcproto-refs/minecraft-data/data/pc/1.8/protocol.json`, `version.json`; diff against `/tmp/mcproto-refs/minecraft-data/data/pc/1.7/protocol.json`  
**ViaVersion source:** `/tmp/mcproto-refs/ViaVersion/common/src/main/java/com/viaversion/viaversion/protocols/v1_8to1_9/packet/` — `ClientboundPackets1_8.java`, `ServerboundPackets1_8.java`  
**Protocol version confirmed:** `version.json` (`/tmp/mcproto-refs/minecraft-data/data/pc/1.8/version.json`) = `{"version":47,"minecraftVersion":"1.8.8","majorVersion":"1.8"}`; 1.7.10 = `{"version":5}`.

---

## Headline changes

1.8 ("The Bountiful Update") shipped 2014-09-02. On the wire it made three structural additions that defined the protocol for years:

**Packet compression.** A new `Set Compression` packet was inserted into the login flow (login-state, clientbound 0x03). From that point forward, each packet carries a second VarInt (`Data Length`) between the existing `Packet Length` VarInt and the payload, enabling optional zlib deflate per-packet. This is the biggest framing change since the Netty rewrite in 1.7. See [§ Compression detail](#compression-in-detail) below.

**Palette-based block and chunk encoding.** The `Map Chunk` (`0x21`) and `Multi Block Change` (`0x22`) packets switched from the 1.7 format (separate 8-bit block-ID + 4-bit metadata nibble-plane) to a single unified block-state integer. The `Multi Block Change` record went from a packed `{12-bit blockId, 4-bit metadata}` bitfield (separate words) to a single VarInt block-state ID per record. The `block_change` packet's payload similarly changed from `{type:varint, metadata:u8}` (two fields) to a single `{type:varint}` block-state ID.

**New packed-integer Position type.** Block coordinates moved from three separate `i32`/`i16`/`i32` fields in a `position_iii`/`position_isi`/`position_ibi` struct to a single `i64` packed as `{x:26-bit signed, y:12-bit signed, z:26-bit signed}`. This is the `position` bitfield type that appears throughout the 1.8 protocol.

**Why protocol 47 stayed so long.** 1.8 was the last major version for ~17 months (1.9 shipped 2016-02-29). Server operators preferred it for PvP because 1.9 introduced a weapon cooldown mechanic that most competitive networks rejected. Combined with Mojang's slow adoption of forced upgrades, protocol 47 remained the dominant live-traffic version until at least 2017 — the era that spawned the entire ViaVersion ecosystem.

---

## Compression in detail

> Cross-reference: [../05-login-encryption.md](../05-login-encryption.md) covers the full login flow; this section focuses on the 1.8 addition.

### The Set Compression packet

Sent by the server **during the login state**, after `Login Success` is in the pipeline but **before** it is actually sent:

| State | Direction | ID | Name | Field | Type |
|---|---|---|---|---|---|
| login | clientbound | `0x03` | Set Compression | threshold | VarInt |

Source: `minecraft-data/data/pc/1.8/protocol.json` login.toClient mappings `"0x03": "compress"` and `packet_compress` definition `[{"name":"threshold","type":"varint"}]`.

The 1.7 login state had only three clientbound packets (`0x00` disconnect, `0x01` encryption_begin, `0x02` success). 1.8 added `0x03` compress.

A negative `threshold` value disables compression. A value ≥ 0 means: packets whose uncompressed payload is ≥ `threshold` bytes **must** be zlib-compressed; smaller packets **may** be sent uncompressed (Data Length = 0).

### Framing change: the Data Length VarInt

Before compression is enabled the packet format is identical to 1.7:

```
[Packet Length : VarInt] [Packet ID : VarInt] [Payload...]
```

After `Set Compression` is received, **all** subsequent packets (in both directions) add a second VarInt:

```
[Packet Length : VarInt] [Data Length : VarInt] [Packet ID + Payload : zlib or raw]
```

- `Packet Length` = byte-count of everything that follows, i.e. `len(Data Length varint) + len(compressed-or-raw-data)`.
- `Data Length = 0` → the following bytes are **not** compressed (uncompressed payload was below threshold).
- `Data Length > 0` → the following bytes are zlib-deflated; `Data Length` is the **uncompressed** byte count (used to size the decompression buffer).

This second VarInt is invisible in the 1.7 framing; adding it is the entire framing change. The rest of the packet (ID + payload) is structurally unchanged — compression is a wrapper layer only.

### Login flow with compression (1.8)

```mermaid
sequenceDiagram
    participant C as Client
    participant S as Server
    C->>S: Login Start (0x00) [username]
    S->>C: Encryption Request (0x01) [serverId, pubKey, verifyToken]
    C->>S: Encryption Response (0x02) [encSharedSecret, encVerifyToken]
    Note over C,S: AES/CFB8 encryption begins (both directions)
    S->>C: Set Compression (0x03) [threshold] — NEW in 1.8
    Note over C,S: Framing switches to compressed format (both directions)
    S->>C: Login Success (0x02) [uuid, username]
    Note over C,S: Transition to PLAY state
```

Note: `Set Compression` is sent **encrypted** (after the AES stream is established) but **before** the state transitions to PLAY. The compression threshold is server-controlled; vanilla default is 256 bytes.

---

## Protocol changes vs 1.7 (from minecraft-data diff)

The 1.7 and 1.8 protocol.json files share the same top-level packet names and IDs for nearly all play-state packets (0x00–0x40 clientbound, 0x00–0x17 serverbound). The protocol-breaking changes are in field types and the new packets. Key diffs:

### Handshake state

Identical. Both: `0x00` set_protocol (`protocolVersion:varint, serverHost:string, serverPort:u16, nextState:varint`).

### Login state (clientbound)

| ID | 1.7 packet | 1.8 change |
|---|---|---|
| 0x00 | disconnect | unchanged |
| 0x01 | encryption_begin | **field type change**: `publicKey` and `verifyToken` lengths changed from `i16`-prefixed buffers (1.7) to `varint`-prefixed buffers (1.8) |
| 0x02 | success | unchanged (`uuid:string, username:string`) |
| 0x03 | — | **NEW**: `compress` (`threshold:varint`) |

Source: compare `login.toClient` in both `protocol.json` files. In 1.7, `packet_encryption_begin` uses `{"countType":"i16"}` for both fields; in 1.8 they use `{"countType":"varint"}`.

### Login state (serverbound)

Same change: 1.8 `encryption_begin` uses `varint`-prefixed `sharedSecret` and `verifyToken` buffers instead of `i16`-prefixed.

### Play state — new/changed clientbound packets

| ID | Name | 1.7 → 1.8 change |
|---|---|---|
| 0x01 (login) | Login | **Added** `reducedDebugInfo:bool` field in 1.8 |
| 0x02 (chat) | Chat | **Added** `position:i8` field in 1.8 (chat box=0, system=1, game info/action bar=2) |
| 0x04 (entity_equipment) | Entity Equipment | Entity ID: `i32` → `varint` |
| 0x05 (spawn_position) | Spawn Position | `location`: `position_iii` (3×i32) → packed `position` (single i64 bitfield) |
| 0x06 (update_health) | Update Health | `food`: `i16` → `varint` |
| 0x0a (bed) | Use Bed | Entity ID `i32` → `varint`; `location`: `position_ibi` → packed `position` |
| 0x0c (named_entity_spawn) | Named Entity Spawn | **Major**: removed inline `playerName:string` and `data[]` properties array (1.7 sent these inline); added `playerUUID:UUID` binary type; removed `currentItem` field; 1.7 had string UUID + full profile inline |
| 0x0d (collect) | Collect | Both entity IDs `i32` → `varint` |
| 0x0e (spawn_entity) | Spawn Entity | `objectData` refactored: was inline `{intField:i32, velocityX/Y/Z:i16-conditional}`; same semantics, slightly different schema |
| 0x12 (entity_velocity) | Entity Velocity | Entity ID `i32` → `varint` |
| 0x13 (entity_destroy) | Entity Destroy | Count prefix `i8`+entity `i32` array → `varint` count + `varint` array |
| 0x14–0x19 (entity move/look/teleport) | Entity movement | Entity ID `i32` → `varint`; `onGround:bool` added to rel_entity_move, entity_look, entity_move_look, entity_teleport |
| 0x1a (entity_status) | Entity Status | Entity ID unchanged (`i32`) |
| 0x1c (entity_metadata) | Entity Metadata | Entity ID `i32` → `varint` |
| 0x1d (entity_effect) | Entity Effect | `duration`: `i16` → `varint`; added `hideParticles:bool` |
| 0x1e (remove_entity_effect) | Remove Entity Effect | Entity ID `i32` → `varint` |
| 0x1f (experience) | Set Experience | `level` and `totalExperience`: `i16` → `varint` |
| 0x20 (update_attributes) | Update Attributes | Modifier count prefix: `i16` → `varint` |
| 0x21 (map_chunk) | Map Chunk | **Major**: removed `addBitMap:u16` and `compressedChunkData` (zlib-in-packet); replaced with raw `chunkData:ByteArray(varint-prefixed)`; blocks now use palette block-state IDs |
| 0x22 (multi_block_change) | Multi Block Change | **Major**: record format changed from separate `{metadata+blockId bitfield, y:u8, x+z bitfield}` to `{horizontalPos:u8, y:u8, blockId:varint}`; count now `varint`, removed `dataLength:i32` |
| 0x23 (block_change) | Block Change | `location`: `position_ibi` → packed `position`; removed `metadata:u8` field — block-state ID in `type:varint` encodes both |
| 0x24 (block_action) | Block Action | `location`: `position_isi` → packed `position` |
| 0x25 (block_break_animation) | Block Break Animation | `location`: `position_iii` → packed `position` |
| 0x26 (map_chunk_bulk) | Map Chunk Bulk | **Major**: removed per-chunk `addBitMap:u16`; removed `compressedChunkData` bulk buffer; switched to `skyLightSent:bool` + varint-prefixed meta array + raw data buffer |
| 0x28 (world_event) | World Event | `location`: `position_ibi` → packed `position` |
| 0x2a (world_particles) | World Particles | Switched from `particleName:string` to `particleId:i32`; added `longDistance:bool`; added extra `data[]` varint array for item/block particles |
| 0x2c (spawn_entity_weather) | Spawn Weather Entity | Entity ID unchanged (`varint`) |
| 0x2d (open_window) | Open Window | `inventoryType`: `u8` numeric → `string` identifier; removed `useProvidedTitle:bool` |
| 0x33 (update_sign) | Update Sign | `location`: `position_isi` → packed `position` |
| 0x34 (map) | Map Item Data | **Major reformat**: 1.7 had just `{itemDamage:varint, data:buffer(i16)}`; 1.8 expanded to `{itemDamage:varint, scale:i8, icons:[...], columns:i8, rows:i8, x:i8, y:i8, data:ByteArray}` |
| 0x35 (tile_entity_data) | Tile Entity Data | `location`: `position_isi` → packed `position`; `nbtData`: `compressedNbt` → uncompressed `optionalNbt` |
| 0x36 (open_sign_entity) | Open Sign Editor | `location`: `position_iii` → packed `position` |
| 0x38 (player_info) | Player Info | **Major**: 1.7 was a flat `{playerName:string, online:bool, ping:i16}`; 1.8 became an action-based structure with `{action:varint, data:[{uuid:UUID, ...}]}` supporting add/remove/update-gamemode/update-latency/update-displayname actions |
| 0x41 (difficulty) | Change Difficulty | **NEW** in 1.8 (absent from 1.7) |
| 0x42 (combat_event) | Player Combat | **NEW** in 1.8 |
| 0x43 (camera) | Set Camera | **NEW** in 1.8 |
| 0x44 (world_border) | World Border | **NEW** in 1.8 |
| 0x45 (title) | Title | **NEW** in 1.8 |
| 0x46 (set_compression) | Set Compression | **NEW** in 1.8 (play-state duplicate; also exists in login state as 0x03) |
| 0x47 (playerlist_header) | Tab List Header/Footer | **NEW** in 1.8 |
| 0x48 (resource_pack_send) | Resource Pack | **NEW** in 1.8 |
| 0x49 (update_entity_nbt) | Update Entity NBT | **NEW** in 1.8 |

Source: packet maps in `minecraft-data/data/pc/1.8/protocol.json` play.toClient vs `data/pc/1.7/protocol.json` play.toClient. 1.7 clientbound play topped at `0x40` (kick_disconnect); 1.8 extends to `0x49`.

### Play state — changed serverbound packets

| ID | Name | 1.7 → 1.8 change |
|---|---|---|
| 0x02 (use_entity) | Interact | `target:i32` → `varint`; `mouse:i8` → `varint`; added optional `{x,y,z}:f32` fields when `mouse=2` (interact-at) |
| 0x04 (position) | Player Position | **Removed** `stance:f64` field (1.7 had x,stance,y,z; 1.8 has x,y,z) |
| 0x06 (position_look) | Player Pos+Look | Same: removed `stance:f64` |
| 0x07 (block_dig) | Player Action | `status:i8` → `varint`; `location`: `position_ibi` → packed `position` |
| 0x08 (block_place) | Use Item On | `location`: `position_ibi` → packed `position` |
| 0x0a (arm_animation) | Swing Arm | 1.7 had `{entityId:i32, animation:i8}`; 1.8 is empty (no fields) |
| 0x0b (entity_action) | Player Command | `entityId:i32` → `varint`; `actionId:i8` → `varint`; `jumpBoost:i32` → `varint` |
| 0x0c (steer_vehicle) | Player Input | `jump:bool+unmount:bool` → single `jump:u8` flags byte |
| 0x12 (update_sign) | Sign Update | `location`: `position_isi` → packed `position` |
| 0x14 (tab_complete) | Command Suggestion | Added optional `block:option<position>` field |
| 0x15 (settings) | Client Information | Removed `difficulty:u8` and `showCape:bool`; added `skinParts:u8` bitmask |
| 0x18 (spectate) | Teleport To Entity | **NEW** in 1.8 |
| 0x19 (resource_pack_receive) | Resource Pack Status | **NEW** in 1.8 |

Source: `minecraft-data/data/pc/1.8/protocol.json` play.toServer vs `data/pc/1.7/protocol.json` play.toServer. 1.7 serverbound play topped at `0x17` (custom_payload); 1.8 extends to `0x19`.

---

## Entity metadata format

Both 1.7 and 1.8 use the same sentinel-terminated metadata loop structure:
- Each entry is a header byte with `{type:3 bits, key:5 bits}`.
- End of stream signalled by byte `0x7F` (127).
- Entry values by type: 0=i8, 1=i16, 2=i32, 3=f32, 4=string, 5=slot, 6={x:i32,y:i32,z:i32}, 7={pitch:f32,yaw:f32,roll:f32}.

The type table is identical in both versions (verified from `entityMetadataItem` in both `protocol.json` files). However, the set of actual metadata indices and their meanings changed for several entity types in 1.8 to accommodate new entity properties (guardians, rabbits, armor stands). ViaRewind's `EntityDataIndex1_7_6_10.java` enumerates the authoritative 1.8 index assignments used in 1.8→1.7 translation: base entity indices 0 (flags, byte) and 1 (air, short) are unchanged; `LIVING_ENTITY_BASE` health moves to index 6 (float); new 1.8 fields (name tag at 2, name tag visibility at 3, silent at 4) have no 1.7 equivalent and are dropped. `ARMOR_STAND` uses 1.8 indices 10–16 (flags, head/body/arm/leg rotations). `GUARDIAN` metadata indices are not translated (no 1.7 equivalent entity). `RABBIT` is similarly absent (new 1.8 entity, no translation). Note this is the 1.8 side of a translation table, not a standalone per-entity reference, but it confirms the index assignments for entities present in both versions. (Source: `ViaRewind/common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/data/EntityDataIndex1_7_6_10.java`.)

The container types `entityMetadata` and `entityMetadataItem` in 1.8's `protocol.json` are structurally identical to 1.7 — confirming that the metadata **encoding format** did not change between protocol 5 and 47; the changes were in which indices are used, not the framing.

---

## Chunk and block encoding

### 1.7 chunk format (for comparison)

In 1.7, `Map Chunk` (`0x21`) contained:
- `bitMap:u16` — which of the 16 vertical sections are present
- `addBitMap:u16` — additional-data sections for blocks requiring >8 bits of block ID (extended blocks)
- `compressedChunkData:buffer(i32-count)` — zlib-deflated payload containing raw nibble arrays: 8-bit block IDs + 4-bit metadata nibbles + 4-bit block light + optional 4-bit sky light + optional 4-bit add-data

The 1.7 format encoded block type as `(blockID << 4) | metadata` using two separate nibble planes.

### 1.8 chunk format

In 1.8, `Map Chunk` (`0x21`) contains:
- `bitMap:u16` — which sections are present
- `chunkData:ByteArray` (varint-prefixed) — raw uncompressed per-section data

The per-section data layout in 1.8 encodes blocks as **block-state IDs** — a single integer combining what was previously `blockId` and `metadata`. Each section now stores:
- 4096 block-state values as 16-bit entries (2 bytes per block, stored little-endian in a flat array of `4096 × 2` bytes)
- 2048 bytes block light nibble array
- 2048 bytes sky light nibble array (overworld only)

The `addBitMap` field and the separate metadata nibble plane are gone entirely. Block state IDs are the canonical 1.8+ block representation: e.g., oak log facing north is a single integer distinct from oak log facing east, rather than `id=17, meta=4` vs `id=17, meta=0`.

The `Multi Block Change` record format reflects this too: in 1.7, each record packed `{metadata:4bits, blockId:12bits}` in one i16 plus a separate `y:u8` and `{z:4bits,x:4bits}` nibble byte (source: `minecraft-data/data/pc/1.7/protocol.json` bitfield definitions — z occupies the high nibble, x the low nibble). In 1.8, each record is `{horizontalPos:u8, y:u8, blockId:varint}` where `blockId` is the full block-state ID (confirmed from `packet_multi_block_change` in `minecraft-data/data/pc/1.8/protocol.json` — `{"countType":"varint"}` for blockId). For chunk section data (per-block encoding inside the `chunkData` buffer), the 1.8 format stores block-state IDs as **4096 × 16-bit little-endian unsigned shorts** per section (confirmed from `ViaVersion/ChunkSectionType1_8.java`: reads `littleEndianView.readUnsignedShort()` for each of `ChunkSection.SIZE` = 4096 blocks; writes via `littleEndianView.writeShort()`).

---

## Packet inventory by state — 1.8 (protocol 47)

Source: `minecraft-data/data/pc/1.8/protocol.json` packet mapper sections. ViaVersion `ClientboundPackets1_8.java` and `ServerboundPackets1_8.java` confirm the same IDs.

### Handshake (C→S)

| ID | Name |
|---|---|
| 0x00 | Set Protocol (Handshake) |
| 0xFE | Legacy Server List Ping |

### Status

| ID | Direction | Name |
|---|---|---|
| 0x00 | S→C | Server Info (JSON response) |
| 0x01 | S→C | Ping (i64 payload echo) |
| 0x00 | C→S | Request (empty) |
| 0x01 | C→S | Ping (i64 timestamp) |

### Login

| ID | Direction | Name |
|---|---|---|
| 0x00 | S→C | Disconnect |
| 0x01 | S→C | Encryption Request |
| 0x02 | S→C | Login Success |
| 0x03 | S→C | **Set Compression** ← new in 1.8 |
| 0x00 | C→S | Login Start |
| 0x01 | C→S | Encryption Response |

### Play — Clientbound (S→C)

| ID | Name |
|---|---|
| 0x00 | Keep Alive |
| 0x01 | Login (Join Game) |
| 0x02 | Chat Message |
| 0x03 | Time Update |
| 0x04 | Entity Equipment |
| 0x05 | Spawn Position |
| 0x06 | Update Health |
| 0x07 | Respawn |
| 0x08 | Player Position and Look |
| 0x09 | Held Item Change |
| 0x0A | Use Bed |
| 0x0B | Animation |
| 0x0C | Spawn Named Entity |
| 0x0D | Collect Item |
| 0x0E | Spawn Object |
| 0x0F | Spawn Mob |
| 0x10 | Spawn Painting |
| 0x11 | Spawn Experience Orb |
| 0x12 | Entity Velocity |
| 0x13 | Destroy Entities |
| 0x14 | Entity (no-op move) |
| 0x15 | Entity Relative Move |
| 0x16 | Entity Look |
| 0x17 | Entity Look and Relative Move |
| 0x18 | Entity Teleport |
| 0x19 | Entity Head Look |
| 0x1A | Entity Status |
| 0x1B | Attach Entity |
| 0x1C | Entity Metadata |
| 0x1D | Entity Effect |
| 0x1E | Remove Entity Effect |
| 0x1F | Set Experience |
| 0x20 | Entity Properties |
| 0x21 | Chunk Data |
| 0x22 | Multi Block Change |
| 0x23 | Block Change |
| 0x24 | Block Action |
| 0x25 | Block Break Animation |
| 0x26 | Map Chunk Bulk |
| 0x27 | Explosion |
| 0x28 | Effect |
| 0x29 | Sound Effect |
| 0x2A | Particle |
| 0x2B | Change Game State |
| 0x2C | Spawn Global Entity |
| 0x2D | Open Window |
| 0x2E | Close Window |
| 0x2F | Set Slot |
| 0x30 | Window Items |
| 0x31 | Window Property |
| 0x32 | Confirm Transaction |
| 0x33 | Update Sign |
| 0x34 | Maps |
| 0x35 | Update Block Entity |
| 0x36 | Open Sign Editor |
| 0x37 | Statistics |
| 0x38 | Player List Item |
| 0x39 | Player Abilities |
| 0x3A | Tab-Complete |
| 0x3B | Scoreboard Objective |
| 0x3C | Update Score |
| 0x3D | Display Scoreboard |
| 0x3E | Teams |
| 0x3F | Plugin Message |
| 0x40 | Disconnect |
| 0x41 | Server Difficulty ← new in 1.8 |
| 0x42 | Combat Event ← new in 1.8 |
| 0x43 | Camera ← new in 1.8 |
| 0x44 | World Border ← new in 1.8 |
| 0x45 | Title ← new in 1.8 |
| 0x46 | Set Compression (play-state) ← new in 1.8 |
| 0x47 | Player List Header and Footer ← new in 1.8 |
| 0x48 | Resource Pack Send ← new in 1.8 |
| 0x49 | Update Entity NBT ← new in 1.8 |

### Play — Serverbound (C→S)

| ID | Name |
|---|---|
| 0x00 | Keep Alive |
| 0x01 | Chat Message |
| 0x02 | Use Entity |
| 0x03 | Player (ground status only) |
| 0x04 | Player Position |
| 0x05 | Player Look |
| 0x06 | Player Position and Look |
| 0x07 | Player Digging |
| 0x08 | Player Block Placement |
| 0x09 | Held Item Change |
| 0x0A | Animation (arm swing — empty payload in 1.8) |
| 0x0B | Entity Action |
| 0x0C | Steer Vehicle |
| 0x0D | Close Window |
| 0x0E | Click Window |
| 0x0F | Confirm Transaction |
| 0x10 | Creative Inventory Action |
| 0x11 | Enchant Item |
| 0x12 | Update Sign |
| 0x13 | Player Abilities |
| 0x14 | Tab-Complete |
| 0x15 | Client Settings |
| 0x16 | Client Status |
| 0x17 | Plugin Message |
| 0x18 | Spectate ← new in 1.8 |
| 0x19 | Resource Pack Status ← new in 1.8 |

---

## Proxy and translation impact

**ViaVersion floor.** Protocol 47 is ViaVersion's oldest natively supported client. There is no `v1_7to1_8` package in ViaVersion — 1.7 support requires ViaLegacy/ViaRewind. The `v1_8to1_9` package (`/tmp/mcproto-refs/ViaVersion/common/src/main/java/com/viaversion/viaversion/protocols/v1_8to1_9/`) is the FROM-1.8 direction and serves as the canonical definition of the 1.8 packet set.

**Compression negotiation at the proxy.** A proxy operating in front of a 1.8+ server must intercept `Set Compression` (login 0x03) from the backend and decide whether to relay, modify, or suppress it. The compression threshold may differ between the proxy's own connection to the client and the proxy-to-server leg. BungeeCord and Velocity both intercept this packet and re-issue their own `Set Compression` to the client with their own threshold, then maintain separate compression state for each half of the connection.

**Position type translation.** Any proxy accepting 1.7 clients and forwarding to a 1.8+ server must translate between the old triple-i32/i16 position types and the new packed `i64` `position` type for every block-coordinate field. Cross-checked against ViaRewind's `WorldPacketRewriter1_8.java` and `PlayerPacketRewriter1_8.java` (1.8 client ↔ 1.7 server direction): S→C packets requiring position translation are `BLOCK_UPDATE` (→ `U_BYTE_POSITION`), `BLOCK_EVENT` (→ `SHORT_POSITION`), `BLOCK_DESTRUCTION` (→ `INT_POSITION`), `LEVEL_EVENT` (→ `BYTE_POSITION`), `UPDATE_SIGN` (→ `SHORT_POSITION`), `BLOCK_ENTITY_DATA` (→ `SHORT_POSITION`), and `LOGIN`/spawn position (→ `INT_POSITION`). On the C→S serverbound side, `block_dig` and `block_place` carry `BLOCK_POSITION1_8` mapped from `U_BYTE_POSITION`/`SHORT_POSITION` legacy types (ViaRewind `PlayerPacketRewriter1_8.java` lines 618, 635, 727). The list in the original derivation (`spawn_position, bed, block_change, block_action, block_break_animation, update_sign, tile_entity_data, open_sign_entity, world_event`) is consistent with ViaRewind's handler set. (Source: `ViaRewind/common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/rewriter/WorldPacketRewriter1_8.java` and `PlayerPacketRewriter1_8.java`.)

**block_change metadata removal.** A 1.7-to-1.8 translator must combine the 1.7 `{type:varint, metadata:u8}` pair into a single 1.8 block-state VarInt on `block_change`, and split in the reverse direction.

**Stance removal.** The 1.7 serverbound `position` packet had a `stance:f64` field (eye-height offset for collision) that was removed in 1.8 (confirmed from protocol.json diff). A proxy bridging 1.7→1.8 must strip this field; a 1.8→1.7 bridge must synthesise it as `y + 1.62F`. The `y + 1.62` synthesis constant is confirmed from ViaRewind's `PlayerPacketRewriter1_8.java`: `wrapper.set(Types.DOUBLE, 1, y + 1.62F)` in the `PLAYER_POSITION` clientbound handler, where the second DOUBLE slot is the stance field written into the 1.7 position packet. (Source: `ViaRewind/common/src/main/java/com/viaversion/viarewind/protocol/v1_8to1_7_6_10/rewriter/PlayerPacketRewriter1_8.java`, line 187.)

**Player Info restructure.** The flat single-player `player_info` from 1.7 (`playerName, online, ping`) was replaced in 1.8 with the action-based multi-player structure. Proxies doing tab-list passthrough must understand the 1.8 structure.

**New packets requiring proxy awareness.** `World Border` (0x44), `Title` (0x45), `Combat Event` (0x42), and `Set Compression` (0x46 in play-state) are all 1.8-new and unknown to 1.7 clients. A proxy connecting a 1.7 client to a 1.8 server must either translate or drop these; ViaLegacy/ViaRewind handle this for the compatibility layer.

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## Sub-version notes (1.8.1 – 1.8.9)

All 1.8.x patches share **protocol 47**. Patch releases addressed server-side exploits (combat, enchantment mechanics, item duplication), server crash vectors, and connectivity bugs but made **no wire-format changes**. A 1.8 client connects to a 1.8.9 server without negotiation issues, and vice versa.

Confirmed: all 1.8.x releases share protocol 47. The minecraft-data `version.json`
for the 1.8 majorVersion slot records `{"version":47,"minecraftVersion":"1.8.8"}`,
and the minecraft-data schema keys the entire 1.8 family to a single `protocol.json`
with no sub-version splits — consistent with zero wire-format changes across the
patch line. (Source: `minecraft-data/data/pc/1.8/version.json`.)

---

## Sources summary

| Claim | Source |
|---|---|
| Protocol 47; version 1.8.8 as representative | `/tmp/mcproto-refs/minecraft-data/data/pc/1.8/version.json` |
| Release date 2014-09-02 | <https://minecraft.wiki/w/Java_Edition_1.8> (fetched 2026-06-19) |
| Login 0x03 `compress` packet field def | `/tmp/mcproto-refs/minecraft-data/data/pc/1.8/protocol.json` login.toClient |
| 1.7 login had no 0x03 | `/tmp/mcproto-refs/minecraft-data/data/pc/1.7/protocol.json` login.toClient (0x00–0x02 only) |
| Encryption buffer countType i16→varint | Both `protocol.json` files, `packet_encryption_begin` |
| Play packet IDs 0x00–0x49 (1.8) | `/tmp/mcproto-refs/minecraft-data/data/pc/1.8/protocol.json` play.toClient mapper |
| Play packet IDs 0x00–0x40 (1.7) | `/tmp/mcproto-refs/minecraft-data/data/pc/1.7/protocol.json` play.toClient mapper |
| 1.8 clientbound packet enum with IDs | `/tmp/mcproto-refs/ViaVersion/…/v1_8to1_9/packet/ClientboundPackets1_8.java` |
| 1.8 serverbound packet enum with IDs | `/tmp/mcproto-refs/ViaVersion/…/v1_8to1_9/packet/ServerboundPackets1_8.java` |
| Compression framing (Data Length VarInt) | <https://minecraft.wiki/w/Minecraft_Wiki:Projects/wiki.vg_merge/Protocol> (fetched 2026-06-19) |
| chunk_data addBitMap present in 1.7, absent in 1.8 | diff of `packet_map_chunk` in both `protocol.json` |
| multi_block_change record format change | diff of `packet_multi_block_change` in both `protocol.json` |
| `stance` field in 1.7 position, absent in 1.8 | `packet_position` in both `protocol.json` |
| metadata loop structure identical 1.7 and 1.8 | `entityMetadata`/`entityMetadataItem` in both `protocol.json` |