diff --git a/TradeSkillMaster_AuctionDB/Modules/ChannelSync.lua b/TradeSkillMaster_AuctionDB/Modules/ChannelSync.lua
index 539202b..0b22006 100644
--- a/TradeSkillMaster_AuctionDB/Modules/ChannelSync.lua
+++ b/TradeSkillMaster_AuctionDB/Modules/ChannelSync.lua
@@ -12,8 +12,8 @@ local TSM = select(2, ...)
 local ChannelSync = TSM:NewModule("ChannelSync", "AceEvent-3.0")
 
 local CHANNEL_NAME = "TSM_AuctionDB"
-local COMM_PREFIX = "TSMAuctionDB"
-local CHUNK_SIZE = 180
+local COMM_PREFIX = "TSMADB1"
+local CHUNK_SIZE = 200
 local BUNDLE_TIMEOUT = 45
 
 local private = {
@@ -26,16 +26,16 @@ local private = {
 local strbyte = string.byte
 
 local libS = LibStub:GetLibrary("AceSerializer-3.0")
-local libC = LibStub:GetLibrary("LibCompress")
-local libCE
-
-local function GetCodec()
-	if libCE then return libCE end
-	libCE = libC:GetChatEncodeTable("", "\031")
-	if not libCE then
-		libCE = libC:GetChatEncodeTable()
+local libD = LibStub("LibDeflate", true)
+local warnedNoDeflate
+
+local function CanEncode()
+	if libD then return true end
+	if not warnedNoDeflate then
+		warnedNoDeflate = true
+		TSM:Print("AuctionDB channel sync requires LibDeflate. Install or enable an addon that provides it.")
 	end
-	return libCE
+	return false
 end
 
 local function HashString(str)
@@ -43,7 +43,7 @@ local function HashString(str)
 	for i = 1, #str do
 		hash = (hash * 31 + strbyte(str, i)) % 4294967296
 	end
-	return tostring(hash)
+	return hash
 end
 
 local function EnsureChannel()
@@ -58,7 +58,7 @@ end
 
 local function ChatFilter(_, _, msg, _, _, _, _, _, channelName)
 	if channelName ~= CHANNEL_NAME then return end
-	if strsub(msg, 1, #COMM_PREFIX + 1) == COMM_PREFIX .. "|" then
+	if strsub(msg, 1, #COMM_PREFIX) == COMM_PREFIX then
 		return true
 	end
 end
@@ -82,25 +82,18 @@ function ChannelSync:OnChannelNotice()
 end
 
 local function EncodePayload(payload)
+	if not CanEncode() then return end
 	local serialized = libS:Serialize(payload)
-	local codec = GetCodec()
-	if not codec then return end
-	local encoded = codec:Encode(libC:CompressHuffman(serialized))
-	if not encoded then
-		encoded = codec:Encode(libC:CompressLZW(serialized))
-	end
-	if not encoded then
-		encoded = codec:Encode("\001" .. serialized)
-	end
-	return encoded
+	local compressed = libD:CompressDeflate(serialized, { level = 7 })
+	if not compressed then return end
+	return libD:EncodeForPrint(compressed)
 end
 
 local function DecodePayload(encoded)
-	local codec = GetCodec()
-	if not codec then return end
-	local decoded = codec:Decode(encoded)
+	if not CanEncode() then return end
+	local decoded = libD:DecodeForPrint(encoded)
 	if not decoded then return end
-	local decompressed = libC:Decompress(decoded)
+	local decompressed = libD:DecompressDeflate(decoded)
 	if not decompressed then return end
 	local ok, payload = libS:Deserialize(decompressed)
 	if not ok then return end
@@ -131,11 +124,11 @@ function ChannelSync:BroadcastScanData(scanType)
 	local hash = HashString(encoded)
 	if hash == private.lastBroadcastHash then return end
 	private.lastBroadcastHash = hash
-
 	local total = ceil(#encoded / CHUNK_SIZE)
+	if total > 65535 then return end
 	for i = 1, total do
 		local chunk = strsub(encoded, (i - 1) * CHUNK_SIZE + 1, i * CHUNK_SIZE)
-		local msg = strjoin("|", COMM_PREFIX, hash, i .. "/" .. total, chunk)
+		local msg = COMM_PREFIX .. string.format("%08x%04x%04x", tonumber(hash), i, total) .. chunk
 		SendChatMessage(msg, "CHANNEL", nil, private.channelId)
 	end
 end
@@ -166,17 +159,22 @@ end
 
 function ChannelSync:OnChannelMessage(_, msg, source, _, _, _, _, _, channelName)
 	if channelName ~= CHANNEL_NAME then return end
-	if strsub(msg or "", 1, #COMM_PREFIX + 1) ~= COMM_PREFIX .. "|" then return end
+	if strsub(msg or "", 1, #COMM_PREFIX) ~= COMM_PREFIX then return end
 
 	source = ("-"):split(source or "")
 	if strlower(source or "") == strlower(UnitName("player") or "") then return end
 
-	local header, hash, seqInfo, chunk = msg:match("^(.-)|([^|]+)|([^|]+)|(.+)$")
-	if header ~= COMM_PREFIX or not hash or not seqInfo or not chunk then return end
-
-	local seq, total = seqInfo:match("^(%d+)%/(%d+)$")
-	seq, total = tonumber(seq), tonumber(total)
-	if not seq or not total then return end
+	local headerLen = #COMM_PREFIX + 16
+	if #msg <= headerLen then return end
+	local meta = strsub(msg, #COMM_PREFIX + 1, headerLen)
+	local chunk = strsub(msg, headerLen + 1)
+	local hashHex = strsub(meta, 1, 8)
+	local seqHex = strsub(meta, 9, 12)
+	local totalHex = strsub(meta, 13, 16)
+	local hash = tonumber(hashHex, 16)
+	local seq = tonumber(seqHex, 16)
+	local total = tonumber(totalHex, 16)
+	if not hash or not seq or not total then return end
 
 	local bundle = private.incoming[hash]
 	if not bundle or (time() - bundle.time) > BUNDLE_TIMEOUT then