diff --git a/codex/contentids_exts.nim b/codex/contentids_exts.nim
new file mode 100644
index 00000000..9ef6fbb5
--- /dev/null
+++ b/codex/contentids_exts.nim
@@ -0,0 +1,8 @@
+const ContentIdsExts = [
+  multiCodec("codex-root"),
+  multiCodec("codex-manifest"),
+  multiCodec("codex-block"),
+  multiCodec("codex-slot-root"),
+  multiCodec("codex-proving-root"),
+  multiCodec("codex-slot-cell"),
+]
diff --git a/codex/merkletree/codex/codex.nim b/codex/merkletree/codex/codex.nim
index 0eec92e4..bf9f39d6 100644
--- a/codex/merkletree/codex/codex.nim
+++ b/codex/merkletree/codex/codex.nim
@@ -47,28 +47,6 @@ type
   CodexProof* = ref object of ByteProof
     mcodec*: MultiCodec
 
-# CodeHashes is not exported from libp2p
-# So we need to recreate it instead of 
-proc initMultiHashCodeTable(): Table[MultiCodec, MHash] {.compileTime.} =
-  for item in HashesList:
-    result[item.mcodec] = item
-
-const CodeHashes = initMultiHashCodeTable()
-
-func mhash*(mcodec: MultiCodec): ?!MHash =
-  let mhash = CodeHashes.getOrDefault(mcodec)
-
-  if isNil(mhash.coder):
-    return failure "Invalid multihash codec"
-
-  success mhash
-
-func digestSize*(self: (CodexTree or CodexProof)): int =
-  ## Number of leaves
-  ##
-
-  self.mhash.size
-
 func getProof*(self: CodexTree, index: int): ?!CodexProof =
   var proof = CodexProof(mcodec: self.mcodec)
 
@@ -128,17 +106,12 @@ proc `$`*(self: CodexProof): string =
   "CodexProof(" & " nleaves: " & $self.nleaves & ", index: " & $self.index & ", path: " &
     $self.path.mapIt(byteutils.toHex(it)) & ", mcodec: " & $self.mcodec & " )"
 
-func compress*(x, y: openArray[byte], key: ByteTreeKey, mhash: MHash): ?!ByteHash =
+func compress*(x, y: openArray[byte], key: ByteTreeKey, codec: MultiCodec): ?!ByteHash =
   ## Compress two hashes
   ##
-
-  # Using Constantine's SHA256 instead of mhash for optimal performance on 32-byte merkle node hashing
-  # See: https://github.com/codex-storage/nim-codex/issues/1162
-
   let input = @x & @y & @[key.byte]
-  var digest = hashes.sha256.hash(input)
-
-  success @digest
+  let digest = ?MultiHash.digest(codec, input).mapFailure
+  success digest.digestBytes
 
 func init*(
     _: type CodexTree, mcodec: MultiCodec = Sha256HashCodec, leaves: openArray[ByteHash]
@@ -147,12 +120,12 @@ func init*(
     return failure "Empty leaves"
 
   let
-    mhash = ?mcodec.mhash()
     compressor = proc(x, y: seq[byte], key: ByteTreeKey): ?!ByteHash {.noSideEffect.} =
-      compress(x, y, key, mhash)
-    Zero: ByteHash = newSeq[byte](mhash.size)
+      compress(x, y, key, mcodec)
+    digestSize = ?mcodec.digestSize.mapFailure
+    Zero: ByteHash = newSeq[byte](digestSize)
 
-  if mhash.size != leaves[0].len:
+  if digestSize != leaves[0].len:
     return failure "Invalid hash length"
 
   var self = CodexTree(mcodec: mcodec, compress: compressor, zero: Zero)
@@ -190,12 +163,12 @@ proc fromNodes*(
     return failure "Empty nodes"
 
   let
-    mhash = ?mcodec.mhash()
-    Zero = newSeq[byte](mhash.size)
+    digestSize = ?mcodec.digestSize.mapFailure
+    Zero = newSeq[byte](digestSize)
     compressor = proc(x, y: seq[byte], key: ByteTreeKey): ?!ByteHash {.noSideEffect.} =
-      compress(x, y, key, mhash)
+      compress(x, y, key, mcodec)
 
-  if mhash.size != nodes[0].len:
+  if digestSize != nodes[0].len:
     return failure "Invalid hash length"
 
   var
@@ -228,10 +201,10 @@ func init*(
     return failure "Empty nodes"
 
   let
-    mhash = ?mcodec.mhash()
-    Zero = newSeq[byte](mhash.size)
+    digestSize = ?mcodec.digestSize.mapFailure
+    Zero = newSeq[byte](digestSize)
     compressor = proc(x, y: seq[byte], key: ByteTreeKey): ?!seq[byte] {.noSideEffect.} =
-      compress(x, y, key, mhash)
+      compress(x, y, key, mcodec)
 
   success CodexProof(
     compress: compressor,
diff --git a/codex/multicodec_exts.nim b/codex/multicodec_exts.nim
new file mode 100644
index 00000000..b14fbbe6
--- /dev/null
+++ b/codex/multicodec_exts.nim
@@ -0,0 +1,11 @@
+const CodecExts = [
+  ("poseidon2-alt_bn_128-sponge-r2", 0xCD10), # bn128 rate 2 sponge
+  ("poseidon2-alt_bn_128-merkle-2kb", 0xCD11), # bn128 2kb compress & merkleize
+  ("poseidon2-alt_bn_128-keyed-compress", 0xCD12), # bn128 keyed compress]
+  ("codex-manifest", 0xCD01),
+  ("codex-block", 0xCD02),
+  ("codex-root", 0xCD03),
+  ("codex-slot-root", 0xCD04),
+  ("codex-proving-root", 0xCD05),
+  ("codex-slot-cell", 0xCD06),
+]
diff --git a/codex/multihash_exts.nim b/codex/multihash_exts.nim
new file mode 100644
index 00000000..e9477177
--- /dev/null
+++ b/codex/multihash_exts.nim
@@ -0,0 +1,40 @@
+import blscurve/bls_public_exports
+import pkg/constantine/hashes
+import poseidon2
+
+proc sha2_256hash_constantine(data: openArray[byte], output: var openArray[byte]) =
+  # Using Constantine's SHA256 instead of mhash for optimal performance on 32-byte merkle node hashing
+  # See: https://github.com/codex-storage/nim-codex/issues/1162
+  if len(output) > 0:
+    let digest = hashes.sha256.hash(data)
+    copyMem(addr output[0], addr digest[0], 32)
+
+proc poseidon2_sponge_rate2(data: openArray[byte], output: var openArray[byte]) =
+  if len(output) > 0:
+    var digest = poseidon2.Sponge.digest(data).toBytes()
+    copyMem(addr output[0], addr digest[0], uint(len(output)))
+
+proc poseidon2_merkle_2kb_sponge(data: openArray[byte], output: var openArray[byte]) =
+  if len(output) > 0:
+    var digest = poseidon2.SpongeMerkle.digest(data, 2048).toBytes()
+    copyMem(addr output[0], addr digest[0], uint(len(output)))
+
+const Sha2256MultiHash* = MHash(
+  mcodec: multiCodec("sha2-256"),
+  size: sha256.sizeDigest,
+  coder: sha2_256hash_constantine,
+)
+const HashExts = [
+  # override sha2-256 hash function
+  Sha2256MultiHash,
+  MHash(
+    mcodec: multiCodec("poseidon2-alt_bn_128-sponge-r2"),
+    size: 32,
+    coder: poseidon2_sponge_rate2,
+  ),
+  MHash(
+    mcodec: multiCodec("poseidon2-alt_bn_128-merkle-2kb"),
+    size: 32,
+    coder: poseidon2_merkle_2kb_sponge,
+  ),
+]
diff --git a/config.nims b/config.nims
index 8700f60e..b1bc4cbe 100644
--- a/config.nims
+++ b/config.nims
@@ -92,6 +92,12 @@ else:
   on
 --warningAsError:
   "ProveField:on"
+--define:
+  "libp2p_multicodec_exts:../../../codex/multicodec_exts.nim"
+--define:
+  "libp2p_multihash_exts:../../../codex/multihash_exts.nim"
+--define:
+  "libp2p_contentids_exts:../../../codex/contentids_exts.nim"
 
 when (NimMajor, NimMinor) >= (1, 4):
   --warning:
diff --git a/tests/codex/merkletree/testcodextree.nim b/tests/codex/merkletree/testcodextree.nim
index 29390c16..91ccd7f5 100644
--- a/tests/codex/merkletree/testcodextree.nim
+++ b/tests/codex/merkletree/testcodextree.nim
@@ -82,10 +82,10 @@ suite "Test CodexTree":
       tree == fromNodes
 
 let
-  mhash = sha256.mhash().tryGet
-  zero: seq[byte] = newSeq[byte](mhash.size)
+  digestSize = sha256.digestSize.get
+  zero: seq[byte] = newSeq[byte](digestSize)
   compress = proc(x, y: seq[byte], key: ByteTreeKey): seq[byte] =
-    compress(x, y, key, mhash).tryGet
+    compress(x, y, key, sha256).tryGet
 
   makeTree = proc(data: seq[seq[byte]]): CodexTree =
     CodexTree.init(sha256, leaves = data).tryGet
diff --git a/vendor/nim-libp2p b/vendor/nim-libp2p
index 7eaf79fe..aa8ce46f 160000
--- a/vendor/nim-libp2p
+++ b/vendor/nim-libp2p
@@ -1 +1 @@
-Subproject commit 7eaf79fefe45b03a4281e3505d5fcc97b32df39c
+Subproject commit aa8ce46f782240cb99a7222c474022b8cfd24e52