diff --git a/librarymanagement/src/main/contraband/librarymanagement.json b/librarymanagement/src/main/contraband/librarymanagement.json
index d28da3b69..d098603d8 100644
--- a/librarymanagement/src/main/contraband/librarymanagement.json
+++ b/librarymanagement/src/main/contraband/librarymanagement.json
@@ -267,22 +267,33 @@
         { "name": "organization",      "type": "String"                                                                                               },
         { "name": "name",              "type": "String"                                                                                               },
         { "name": "revision",          "type": "String"                                                                                               },
-        { "name": "configurations",    "type": "Option[String]",                      "default": "None",                             "since": "0.0.1" },
-        { "name": "isChanging",        "type": "boolean",                             "default": "false",                            "since": "0.0.1" },
-        { "name": "isTransitive",      "type": "boolean",                             "default": "true",                             "since": "0.0.1" },
-        { "name": "isForce",           "type": "boolean",                             "default": "false",                            "since": "0.0.1" },
-        { "name": "explicitArtifacts", "type": "sbt.librarymanagement.Artifact*",     "default": "Vector.empty",                     "since": "0.0.1" },
-        { "name": "inclusions",        "type": "sbt.librarymanagement.InclExclRule*", "default": "Vector.empty",                     "since": "0.0.1" },
-        { "name": "exclusions",        "type": "sbt.librarymanagement.InclExclRule*", "default": "Vector.empty",                     "since": "0.0.1" },
-        { "name": "extraAttributes",   "type": "Map[String, String]",                 "default": "Map.empty",                        "since": "0.0.1" },
-        { "name": "crossVersion",      "type": "sbt.librarymanagement.CrossVersion",  "default": "sbt.librarymanagement.Disabled()", "since": "0.0.1" },
-        { "name": "branchName",        "type": "Option[String]",                      "default": "None",                             "since": "0.0.1" }
+        { "name": "configurations",    "type": "Option[String]",                         "default": "None",                             "since": "0.0.1" },
+        { "name": "isChanging",        "type": "boolean",                                "default": "false",                            "since": "0.0.1" },
+        { "name": "isTransitive",      "type": "boolean",                                "default": "true",                             "since": "0.0.1" },
+        { "name": "isForce",           "type": "boolean",                                "default": "false",                            "since": "0.0.1" },
+        { "name": "explicitArtifacts", "type": "sbt.librarymanagement.Artifact*",        "default": "Vector.empty",                     "since": "0.0.1" },
+        { "name": "inclusions",        "type": "sbt.librarymanagement.InclExclRule*",    "default": "Vector.empty",                     "since": "0.0.1" },
+        { "name": "exclusions",        "type": "sbt.librarymanagement.InclExclRule*",    "default": "Vector.empty",                     "since": "0.0.1" },
+        { "name": "extraAttributes",   "type": "Map[String, String]",                    "default": "Map.empty",                        "since": "0.0.1" },
+        { "name": "crossVersion",      "type": "sbt.librarymanagement.CrossVersion",     "default": "sbt.librarymanagement.Disabled()", "since": "0.0.1" },
+        { "name": "branchName",        "type": "Option[String]",                         "default": "None",                             "since": "0.0.1" },
+        { "name": "checksum",          "type": "Option[sbt.librarymanagement.Checksum]", "default": "None",                             "since": "0.0.1" }
       ],
       "toString": [
         "this.toStringImpl"
       ],
       "parentsCompanion": "sbt.librarymanagement.ModuleIDFunctions"
     },
+    {
+       "name": "Checksum",
+      "namespace": "sbt.librarymanagement",
+      "target": "Scala",
+      "type": "record",
+      "fields": [
+        { "name": "digest", "type": "String"                    },
+        { "name": "type",   "type": "String", "default": "sha1" }
+      ]
+    },
     {
       "name": "ModuleInfo",
       "namespace": "sbt.librarymanagement",
diff --git a/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleIDExtra.scala b/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleIDExtra.scala
index 5b89b5419..e52df5a4d 100644
--- a/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleIDExtra.scala
+++ b/librarymanagement/src/main/scala/sbt/librarymanagement/ModuleIDExtra.scala
@@ -22,6 +22,7 @@ abstract class ModuleIDExtra {
   def extraAttributes: Map[String, String]
   def crossVersion: CrossVersion
   def branchName: Option[String]
+  def checksum: Option[Checksum]
 
   protected[this] def copy(
       organization: String = organization,
@@ -36,12 +37,14 @@ abstract class ModuleIDExtra {
       exclusions: Vector[ExclusionRule] = exclusions,
       extraAttributes: Map[String, String] = extraAttributes,
       crossVersion: CrossVersion = crossVersion,
-      branchName: Option[String] = branchName
+      branchName: Option[String] = branchName,
+      checksum: Option[Checksum] = checksum
   ): ModuleID
 
   protected def toStringImpl: String =
     s"""$organization:$name:$revision""" +
-      (configurations match { case Some(s) => ":" + s; case None => "" }) + {
+      (checksum match { case Some(s)       => s": ${s.`type`} ${s.digest}"; case None => "" }) +
+      (configurations match { case Some(s) => ":" + s; case None                      => "" }) + {
       val attr = attributeString
       if (attr == "") ""
       else " " + attr