diff --git a/.github/workflows/publish-docker-image.yml b/.github/workflows/publish-docker-image.yml
index af066035..4563687d 100644
--- a/.github/workflows/publish-docker-image.yml
+++ b/.github/workflows/publish-docker-image.yml
@@ -52,6 +52,8 @@ jobs:
           pull: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
       - uses: actions/attest-build-provenance@v1
         with:
           subject-name: ${{ env.IMAGE_NAME}}
diff --git a/build.sbt b/build.sbt
index 3fd39805..d0bf068b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -1,21 +1,22 @@
 Global / onChangedBuildSource := ReloadOnSourceChanges
 
-enablePlugins(UniversalDeployPlugin, JavaAppPackaging, GitVersioning)
+enablePlugins(UniversalDeployPlugin, GitVersioning)
 
-git.useGitDescribe := true
-git.baseVersion := "1.0.0"
+git.useGitDescribe       := true
+git.baseVersion          := "1.0.0"
 git.uncommittedSignifier := Some("DIRTY")
 
-scalaVersion := "2.13.14"
-organization := "network.units"
+scalaVersion     := "2.13.14"
+organization     := "network.units"
 organizationName := "Units Network"
-name := "consensus-client"
+name             := "consensus-client"
+maintainer       := "Units Network Team"
 resolvers ++= Resolver.sonatypeOssRepos("releases") ++ Resolver.sonatypeOssRepos("snapshots") ++ Seq(Resolver.mavenLocal)
 libraryDependencies ++= Seq(
-  "com.wavesplatform" % "node" % "1.5.7" % "provided",
-  "com.softwaremill.sttp.client3" % "core_2.13" % "3.9.8",
-  "com.softwaremill.sttp.client3" %% "play-json" % "3.9.8",
-  "com.github.jwt-scala" %% "jwt-play-json" % "10.0.1"
+  "com.wavesplatform"              % "node"          % "1.5.7" % "provided",
+  "com.softwaremill.sttp.client3"  % "core_2.13"     % "3.9.8",
+  "com.softwaremill.sttp.client3" %% "play-json"     % "3.9.8",
+  "com.github.jwt-scala"          %% "jwt-play-json" % "10.0.1"
 )
 
 scalacOptions ++= Seq(
@@ -30,7 +31,49 @@ scalacOptions ++= Seq(
   "-Xlint"
 )
 
-lazy val buildTarballsForDocker = taskKey[Unit]("Package node and grpc-server tarballs and copy them to docker/target")
+Compile / packageDoc / publishArtifact := false
+
+def makeJarName(
+    org: String,
+    name: String,
+    revision: String,
+    artifactName: String,
+    artifactClassifier: Option[String]
+): String =
+  org + "." +
+    name + "-" +
+    Option(artifactName.replace(name, "")).filterNot(_.isEmpty).map(_ + "-").getOrElse("") +
+    revision +
+    artifactClassifier.filterNot(_.isEmpty).map("-" + _).getOrElse("") +
+    ".jar"
+
+def getJarFullFilename(dep: Attributed[File]): String = {
+  val filename: Option[String] = for {
+    module   <- dep.metadata.get(AttributeKey[ModuleID]("moduleID"))
+    artifact <- dep.metadata.get(AttributeKey[Artifact]("artifact"))
+  } yield makeJarName(module.organization, module.name, module.revision, artifact.name, artifact.classifier)
+  filename.getOrElse(dep.data.getName)
+}
+
+def universalDepMappings(deps: Seq[Attributed[File]]): Seq[(File, String)] =
+  for {
+    dep <- deps
+  } yield dep.data -> ("lib/" + getJarFullFilename(dep))
+
+Universal / mappings += {
+  val jar = (Compile / packageBin).value
+  val id  = projectID.value
+  val art = (Compile / packageBin / artifact).value
+  jar -> ("lib/" + makeJarName(id.organization, id.name, id.revision, art.name, art.classifier))
+}
+Universal / mappings ++= universalDepMappings((Runtime / dependencyClasspath).value.filterNot { p =>
+  p.get(AttributeKey[ModuleID]("moduleID")).exists { m =>
+    m.organization == "org.scala-lang" ||
+    m.organization.startsWith("com.fasterxml.jackson")
+  }
+})
+
+lazy val buildTarballsForDocker = taskKey[Unit]("Package consensus-client tarball and copy it to docker/target")
 buildTarballsForDocker := {
   IO.copyFile(
     (Universal / packageZipTarball).value,
diff --git a/src/main/scala/units/ELUpdater.scala b/src/main/scala/units/ELUpdater.scala
index 908bde03..eb98944d 100644
--- a/src/main/scala/units/ELUpdater.scala
+++ b/src/main/scala/units/ELUpdater.scala
@@ -280,7 +280,7 @@ class ELUpdater(
     }
   }
 
-  private def checkRandao(networkBlock: NetworkL2Block, epochNumber: Int): Either[String, Unit] =
+  private def validateRandao(networkBlock: NetworkL2Block, epochNumber: Int): Either[String, Unit] =
     blockchain.vrf(epochNumber) match {
       case None => s"VRF of $epochNumber epoch is empty".asLeft
       case Some(vrf) =>
@@ -288,7 +288,7 @@ class ELUpdater(
         Either.cond(
           expectedPrevRandao == networkBlock.prevRandao,
           (),
-          s"expected prevRandao $expectedPrevRandao, got ${networkBlock.prevRandao}, VRF=$vrf of $epochNumber. Wrong epoch?"
+          s"expected prevRandao $expectedPrevRandao, got ${networkBlock.prevRandao}, VRF=$vrf of $epochNumber"
         )
     }
 
@@ -988,7 +988,7 @@ class ELUpdater(
         s"block miner ${networkBlock.minerRewardL2Address} doesn't equal to ${epochInfo.rewardAddress}"
       )
       _      <- checkSignature(networkBlock, isConfirmed)
-      _      <- checkRandao(networkBlock, contractBlock.fold(epochInfo.number)(_.epoch))
+      _      <- if (contractBlock.isEmpty) validateRandao(networkBlock, epochInfo.number) else Either.unit
       result <- preValidateWithdrawals(networkBlock, epochInfo, contractBlock)
     } yield result).leftMap { err =>
       s"Block ${networkBlock.hash} validation error: $err, ignoring block"
@@ -998,12 +998,14 @@ class ELUpdater(
   private def validateBlock(
       networkBlock: NetworkL2Block,
       parentEcBlock: EcBlock,
+      contractBlock: Option[ContractBlock],
       expectReward: Boolean,
       chainContractOptions: ChainContractOptions
   ): Job[Unit] = {
     (for {
       _ <- validateTimestamp(networkBlock, parentEcBlock)
       _ <- validateWithdrawals(networkBlock, parentEcBlock, expectReward, chainContractOptions)
+      _ <- contractBlock.fold(Either.unit[String])(cb => validateRandao(networkBlock, cb.epoch))
     } yield ()).leftMap(err => ClientError(s"Network block ${networkBlock.hash} validation error: $err"))
   }
 
@@ -1092,7 +1094,7 @@ class ELUpdater(
         logger.debug(err)
       case Right(preValidationResult) =>
         val applyResult = for {
-          _ <- validateBlock(networkBlock, expectedParent, preValidationResult.expectReward, prevState.options)
+          _ <- validateBlock(networkBlock, expectedParent, contractBlock, preValidationResult.expectReward, prevState.options)
           _ = logger.debug(s"Block ${networkBlock.hash} was partially validated, trying to apply and broadcast")
           _ <- engineApiClient.applyNewPayload(networkBlock.payload)
         } yield ()
diff --git a/src/main/scala/units/client/contract/ContractFunction.scala b/src/main/scala/units/client/contract/ContractFunction.scala
index e0de83c5..b469a4ed 100644
--- a/src/main/scala/units/client/contract/ContractFunction.scala
+++ b/src/main/scala/units/client/contract/ContractFunction.scala
@@ -6,7 +6,7 @@ import com.wavesplatform.common.state.ByteStr
 import com.wavesplatform.lang.CommonError
 import com.wavesplatform.lang.v1.FunctionHeader
 import com.wavesplatform.lang.v1.compiler.Terms.{CONST_BYTESTR, CONST_LONG, CONST_STRING, EVALUATED, FUNCTION_CALL}
-import com.wavesplatform.utils.EthEncoding.cleanHexPrefix
+import org.web3j.utils.Numeric.cleanHexPrefix
 import units.util.HexBytesConverter.toHexNoPrefix
 import units.{BlockHash, ClientError, Job}