diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000000..dac4b4baf88
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "cardano-blueprint"]
+	path = cardano-blueprint
+	url = git@github.com:cardano-scaling/cardano-blueprint
diff --git a/cardano-blueprint b/cardano-blueprint
new file mode 160000
index 00000000000..064795c99fd
--- /dev/null
+++ b/cardano-blueprint
@@ -0,0 +1 @@
+Subproject commit 064795c99fda68643636258747917c6d06d2d7b1
diff --git a/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl b/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl
deleted file mode 100644
index 08ef8c9ecfb..00000000000
--- a/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl
+++ /dev/null
@@ -1,37 +0,0 @@
-;
-; NodeToClient Handshake
-;
-
-handshakeMessage
-    = msgProposeVersions
-    / msgAcceptVersion
-    / msgRefuse
-    / msgQueryReply
-
-msgProposeVersions = [0, versionTable]
-msgAcceptVersion   = [1, versionNumber, nodeToClientVersionData]
-msgRefuse          = [2, refuseReason]
-msgQueryReply      = [3, versionTable]
-
-; Entries must be sorted by version number. For testing, this is handled in `handshakeFix`.
-versionTable = { * versionNumber => nodeToClientVersionData }
-
-
-; as of version 2 (which is no longer supported) we set 15th bit to 1
-;               16    / 17    / 18    / 19
-versionNumber = 32784 / 32785 / 32786 / 32787
-
-; As of version 15 and higher
-nodeToClientVersionData = [networkMagic, query]
-
-networkMagic = uint
-query        = bool
-
-refuseReason
-    = refuseReasonVersionMismatch
-    / refuseReasonHandshakeDecodeError
-    / refuseReasonRefused
-
-refuseReasonVersionMismatch      = [0, [ *versionNumber ] ]
-refuseReasonHandshakeDecodeError = [1, versionNumber, tstr]
-refuseReasonRefused              = [2, versionNumber, tstr]
diff --git a/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl b/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl
new file mode 120000
index 00000000000..b03a1fc8450
--- /dev/null
+++ b/ouroboros-network-protocols/cddl/specs/handshake-node-to-client.cddl
@@ -0,0 +1 @@
+../../../cardano-blueprint/src/network/specs/handshake-node-to-client.cddl
\ No newline at end of file
diff --git a/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl b/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl
deleted file mode 100644
index e452cd46e0e..00000000000
--- a/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl
+++ /dev/null
@@ -1,35 +0,0 @@
-;
-; NodeToNode Handshake (>=v13)
-;
-handshakeMessage
-    = msgProposeVersions
-    / msgAcceptVersion
-    / msgRefuse
-    / msgQueryReply
-
-msgProposeVersions = [0, versionTable]
-msgAcceptVersion   = [1, versionNumber, nodeToNodeVersionData]
-msgRefuse          = [2, refuseReason]
-msgQueryReply      = [3, versionTable]
-
-versionTable = { * versionNumber => nodeToNodeVersionData }
-
-versionNumber = 13 / 14
-
-nodeToNodeVersionData = [ networkMagic, initiatorOnlyDiffusionMode, peerSharing, query ]
-
-; range between 0 and 0xffffffff
-networkMagic = 0..4294967295
-initiatorOnlyDiffusionMode = bool
-; range between 0 and 1
-peerSharing = 0..1
-query = bool
-
-refuseReason
-    = refuseReasonVersionMismatch
-    / refuseReasonHandshakeDecodeError
-    / refuseReasonRefused
-
-refuseReasonVersionMismatch      = [0, [ *versionNumber ] ]
-refuseReasonHandshakeDecodeError = [1, versionNumber, tstr]
-refuseReasonRefused              = [2, versionNumber, tstr]
diff --git a/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl b/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl
new file mode 120000
index 00000000000..221127084dc
--- /dev/null
+++ b/ouroboros-network-protocols/cddl/specs/handshake-node-to-node-v13.cddl
@@ -0,0 +1 @@
+../../../cardano-blueprint/src/network/specs/handshake-node-to-node-v13.cddl
\ No newline at end of file
diff --git a/ouroboros-network-protocols/cddl/specs/handshake-node-to-node.cddl b/ouroboros-network-protocols/cddl/specs/handshake-node-to-node.cddl
deleted file mode 100644
index bb0c34d8c10..00000000000
--- a/ouroboros-network-protocols/cddl/specs/handshake-node-to-node.cddl
+++ /dev/null
@@ -1,31 +0,0 @@
-;
-; NodeToNode Handshake, v7 to v10
-;
-
-handshakeMessage
-    = msgProposeVersions
-    / msgAcceptVersion
-    / msgRefuse
-
-msgProposeVersions = [0, versionTable]
-msgAcceptVersion   = [1, versionNumber, nodeToNodeVersionData]
-msgRefuse          = [2, refuseReason]
-
-versionTable = { * versionNumber => nodeToNodeVersionData }
-
-versionNumber = 7 / 8 / 9 / 10
-
-nodeToNodeVersionData = [ networkMagic, initiatorOnlyDiffusionMode ]
-
-; range between 0 and 0xffffffff
-networkMagic = 0..4294967295
-initiatorOnlyDiffusionMode = bool
-
-refuseReason
-    = refuseReasonVersionMismatch
-    / refuseReasonHandshakeDecodeError
-    / refuseReasonRefused
-
-refuseReasonVersionMismatch      = [0, [ *versionNumber ] ]
-refuseReasonHandshakeDecodeError = [1, versionNumber, tstr]
-refuseReasonRefused              = [2, versionNumber, tstr]